From 6982fdc9aa7a349ff7d4c69c40b1339d69070a4c Mon Sep 17 00:00:00 2001
From: Alessandro Fael Garcia <alessfg@hotmail.com>
Date: Thu, 20 Jul 2023 18:28:25 +0200
Subject: [PATCH] Minor formatting fixes

---
 entrypoint/10-listen-on-ipv6-by-default.sh    |  68 +++----
 entrypoint/20-envsubst-on-templates.sh        |  27 +--
 entrypoint/30-tune-worker-processes.sh        | 175 +++++++++---------
 entrypoint/docker-entrypoint.sh               |  68 +++----
 .../10-listen-on-ipv6-by-default.sh           |  68 +++----
 .../alpine-slim/20-envsubst-on-templates.sh   |  27 +--
 .../alpine-slim/30-tune-worker-processes.sh   | 175 +++++++++---------
 mainline/alpine-slim/docker-entrypoint.sh     |  68 +++----
 .../debian/10-listen-on-ipv6-by-default.sh    |  68 +++----
 mainline/debian/20-envsubst-on-templates.sh   |  27 +--
 mainline/debian/30-tune-worker-processes.sh   | 175 +++++++++---------
 mainline/debian/docker-entrypoint.sh          |  68 +++----
 modules/echo/prebuild                         |   1 +
 .../10-listen-on-ipv6-by-default.sh           |  68 +++----
 .../alpine-slim/20-envsubst-on-templates.sh   |  27 +--
 .../alpine-slim/30-tune-worker-processes.sh   | 175 +++++++++---------
 stable/alpine-slim/docker-entrypoint.sh       |  68 +++----
 stable/debian/10-listen-on-ipv6-by-default.sh |  68 +++----
 stable/debian/20-envsubst-on-templates.sh     |  27 +--
 stable/debian/30-tune-worker-processes.sh     | 175 +++++++++---------
 stable/debian/docker-entrypoint.sh            |  68 +++----
 update.sh                                     |  37 ++--
 22 files changed, 900 insertions(+), 828 deletions(-)

diff --git a/entrypoint/10-listen-on-ipv6-by-default.sh b/entrypoint/10-listen-on-ipv6-by-default.sh
index b90bf0c9..f64d8cf6 100755
--- a/entrypoint/10-listen-on-ipv6-by-default.sh
+++ b/entrypoint/10-listen-on-ipv6-by-default.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 ME=$(basename "$0")
@@ -14,49 +14,55 @@ DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
 if [ ! -f "/proc/net/if_inet6" ]; then
-    entrypoint_log "$ME: info: ipv6 not available"
-    exit 0
+  entrypoint_log "$ME: info: IPv6 is not available"
+  exit 0
 fi
 
 if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
-    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
-    exit 0
+  entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
+  exit 0
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: can not modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: IPv6 listen already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
-    . /etc/os-release
+  . /etc/os-release
 else
-    entrypoint_log "$ME: info: can not guess the operating system"
-    exit 0
+  entrypoint_log "$ME: info: Cannot guess the operating system"
+  exit 0
 fi
 
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-    "debian")
-        CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    "alpine")
-        CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    *)
-        entrypoint_log "$ME: info: Unsupported distribution"
-        exit 0
-        ;;
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/entrypoint/20-envsubst-on-templates.sh b/entrypoint/20-envsubst-on-templates.sh
index 3804165c..84af2cd6 100755
--- a/entrypoint/20-envsubst-on-templates.sh
+++ b/entrypoint/20-envsubst-on-templates.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 ME=$(basename "$0")
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 add_stream_block() {
@@ -17,9 +18,12 @@ add_stream_block() {
     entrypoint_log "$ME: $conffile contains a stream block; include $stream_output_dir/*.conf to enable stream templates"
   else
     # check if the file can be modified, e.g. not on a r/o filesystem
-    touch "$conffile" 2>/dev/null || { entrypoint_log "$ME: info: can not modify $conffile (read-only file system?)"; exit 0; }
-    entrypoint_log "$ME: Appending stream block to $conffile to include $stream_output_dir/*.conf"
-    cat << END >> "$conffile"
+    touch "$conffile" 2>/dev/null || {
+      entrypoint_log "$ME: ERROR: can not modify $conffile (read-only file system?)"
+      exit 0
+    }
+    entrypoint_log "$ME: info: Appending stream block to $conffile to include $stream_output_dir/*.conf"
+    cat <<END >>"$conffile"
 # added by "$ME" on "$(date)"
 stream {
   include $stream_output_dir/*.conf;
@@ -37,7 +41,8 @@ auto_envsubst() {
   local filter="${NGINX_ENVSUBST_FILTER:-}"
 
   local template defined_envs relative_path output_path subdir
-  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" < /dev/null ))
+
+  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" </dev/null))
   [ -d "$template_dir" ] || return 0
   if [ ! -w "$output_dir" ]; then
     entrypoint_log "$ME: ERROR: $template_dir exists, but $output_dir is not writable"
@@ -49,8 +54,8 @@ auto_envsubst() {
     subdir=$(dirname "$relative_path")
     # create a subdirectory where the template file exists
     mkdir -p "$output_dir/$subdir"
-    entrypoint_log "$ME: Running envsubst on $template to $output_path"
-    envsubst "$defined_envs" < "$template" > "$output_path"
+    entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+    envsubst "$defined_envs" <"$template" >"$output_path"
   done
 
   # Print the first file with the stream suffix, this will be false if there are none
@@ -67,8 +72,8 @@ auto_envsubst() {
       subdir=$(dirname "$relative_path")
       # create a subdirectory where the template file exists
       mkdir -p "$stream_output_dir/$subdir"
-      entrypoint_log "$ME: Running envsubst on $template to $output_path"
-      envsubst "$defined_envs" < "$template" > "$output_path"
+      entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+      envsubst "$defined_envs" <"$template" >"$output_path"
     done
   fi
 }
diff --git a/entrypoint/30-tune-worker-processes.sh b/entrypoint/30-tune-worker-processes.sh
index defb994f..52786438 100755
--- a/entrypoint/30-tune-worker-processes.sh
+++ b/entrypoint/30-tune-worker-processes.sh
@@ -9,12 +9,15 @@ PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: error: can not modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq $(echo "$token" | tr '-' ' ') | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq $(echo "$token" | tr '-' ' ') | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/entrypoint/docker-entrypoint.sh b/entrypoint/docker-entrypoint.sh
index 8ea04f21..2c89e82d 100755
--- a/entrypoint/docker-entrypoint.sh
+++ b/entrypoint/docker-entrypoint.sh
@@ -1,47 +1,47 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 if [ "$1" = "nginx" ] || [ "$1" = "nginx-debug" ]; then
-    if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
-        entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
+  if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
+    entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
 
-        entrypoint_log "$0: Looking for shell scripts in /docker-entrypoint.d/"
-        find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
-            case "$f" in
-                *.envsh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Sourcing $f";
-                        . "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *.sh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Launching $f";
-                        "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *) entrypoint_log "$0: Ignoring $f";;
-            esac
-        done
+    entrypoint_log "$0: info: Looking for shell scripts in /docker-entrypoint.d/"
+    find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
+      case "$f" in
+      *.envsh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Sourcing $f"
+          . "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *.sh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Launching $f"
+          "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *) entrypoint_log "$0: info: Ignoring $f" ;;
+      esac
+    done
 
-        entrypoint_log "$0: Configuration complete; ready for start up"
-    else
-        entrypoint_log "$0: No files found in /docker-entrypoint.d/, skipping configuration"
-    fi
+    entrypoint_log "$0: info: Configuration complete; ready for start up"
+  else
+    entrypoint_log "$0: info: No files found in /docker-entrypoint.d/, skipping configuration"
+  fi
 fi
 
 exec "$@"
diff --git a/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh b/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh
index b90bf0c9..f64d8cf6 100755
--- a/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh
+++ b/mainline/alpine-slim/10-listen-on-ipv6-by-default.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 ME=$(basename "$0")
@@ -14,49 +14,55 @@ DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
 if [ ! -f "/proc/net/if_inet6" ]; then
-    entrypoint_log "$ME: info: ipv6 not available"
-    exit 0
+  entrypoint_log "$ME: info: IPv6 is not available"
+  exit 0
 fi
 
 if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
-    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
-    exit 0
+  entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
+  exit 0
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: can not modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: IPv6 listen already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
-    . /etc/os-release
+  . /etc/os-release
 else
-    entrypoint_log "$ME: info: can not guess the operating system"
-    exit 0
+  entrypoint_log "$ME: info: Cannot guess the operating system"
+  exit 0
 fi
 
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-    "debian")
-        CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    "alpine")
-        CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    *)
-        entrypoint_log "$ME: info: Unsupported distribution"
-        exit 0
-        ;;
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/mainline/alpine-slim/20-envsubst-on-templates.sh b/mainline/alpine-slim/20-envsubst-on-templates.sh
index 3804165c..84af2cd6 100755
--- a/mainline/alpine-slim/20-envsubst-on-templates.sh
+++ b/mainline/alpine-slim/20-envsubst-on-templates.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 ME=$(basename "$0")
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 add_stream_block() {
@@ -17,9 +18,12 @@ add_stream_block() {
     entrypoint_log "$ME: $conffile contains a stream block; include $stream_output_dir/*.conf to enable stream templates"
   else
     # check if the file can be modified, e.g. not on a r/o filesystem
-    touch "$conffile" 2>/dev/null || { entrypoint_log "$ME: info: can not modify $conffile (read-only file system?)"; exit 0; }
-    entrypoint_log "$ME: Appending stream block to $conffile to include $stream_output_dir/*.conf"
-    cat << END >> "$conffile"
+    touch "$conffile" 2>/dev/null || {
+      entrypoint_log "$ME: ERROR: can not modify $conffile (read-only file system?)"
+      exit 0
+    }
+    entrypoint_log "$ME: info: Appending stream block to $conffile to include $stream_output_dir/*.conf"
+    cat <<END >>"$conffile"
 # added by "$ME" on "$(date)"
 stream {
   include $stream_output_dir/*.conf;
@@ -37,7 +41,8 @@ auto_envsubst() {
   local filter="${NGINX_ENVSUBST_FILTER:-}"
 
   local template defined_envs relative_path output_path subdir
-  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" < /dev/null ))
+
+  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" </dev/null))
   [ -d "$template_dir" ] || return 0
   if [ ! -w "$output_dir" ]; then
     entrypoint_log "$ME: ERROR: $template_dir exists, but $output_dir is not writable"
@@ -49,8 +54,8 @@ auto_envsubst() {
     subdir=$(dirname "$relative_path")
     # create a subdirectory where the template file exists
     mkdir -p "$output_dir/$subdir"
-    entrypoint_log "$ME: Running envsubst on $template to $output_path"
-    envsubst "$defined_envs" < "$template" > "$output_path"
+    entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+    envsubst "$defined_envs" <"$template" >"$output_path"
   done
 
   # Print the first file with the stream suffix, this will be false if there are none
@@ -67,8 +72,8 @@ auto_envsubst() {
       subdir=$(dirname "$relative_path")
       # create a subdirectory where the template file exists
       mkdir -p "$stream_output_dir/$subdir"
-      entrypoint_log "$ME: Running envsubst on $template to $output_path"
-      envsubst "$defined_envs" < "$template" > "$output_path"
+      entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+      envsubst "$defined_envs" <"$template" >"$output_path"
     done
   fi
 }
diff --git a/mainline/alpine-slim/30-tune-worker-processes.sh b/mainline/alpine-slim/30-tune-worker-processes.sh
index defb994f..52786438 100755
--- a/mainline/alpine-slim/30-tune-worker-processes.sh
+++ b/mainline/alpine-slim/30-tune-worker-processes.sh
@@ -9,12 +9,15 @@ PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: error: can not modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq $(echo "$token" | tr '-' ' ') | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq $(echo "$token" | tr '-' ' ') | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/mainline/alpine-slim/docker-entrypoint.sh b/mainline/alpine-slim/docker-entrypoint.sh
index 8ea04f21..ceb10bbb 100755
--- a/mainline/alpine-slim/docker-entrypoint.sh
+++ b/mainline/alpine-slim/docker-entrypoint.sh
@@ -1,47 +1,47 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 if [ "$1" = "nginx" ] || [ "$1" = "nginx-debug" ]; then
-    if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
-        entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
+  if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
+      entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
 
-        entrypoint_log "$0: Looking for shell scripts in /docker-entrypoint.d/"
-        find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
-            case "$f" in
-                *.envsh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Sourcing $f";
-                        . "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *.sh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Launching $f";
-                        "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *) entrypoint_log "$0: Ignoring $f";;
-            esac
-        done
+    entrypoint_log "$0: info: Looking for shell scripts in /docker-entrypoint.d/"
+    find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
+      case "$f" in
+      *.envsh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Sourcing $f"
+          . "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *.sh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Launching $f"
+          "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *) entrypoint_log "$0: info: Ignoring $f" ;;
+      esac
+    done
 
-        entrypoint_log "$0: Configuration complete; ready for start up"
-    else
-        entrypoint_log "$0: No files found in /docker-entrypoint.d/, skipping configuration"
-    fi
+    entrypoint_log "$0: info: Configuration complete; ready for start up"
+  else
+    entrypoint_log "$0: info: No files found in /docker-entrypoint.d/, skipping configuration"
+  fi
 fi
 
 exec "$@"
diff --git a/mainline/debian/10-listen-on-ipv6-by-default.sh b/mainline/debian/10-listen-on-ipv6-by-default.sh
index b90bf0c9..f64d8cf6 100755
--- a/mainline/debian/10-listen-on-ipv6-by-default.sh
+++ b/mainline/debian/10-listen-on-ipv6-by-default.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 ME=$(basename "$0")
@@ -14,49 +14,55 @@ DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
 if [ ! -f "/proc/net/if_inet6" ]; then
-    entrypoint_log "$ME: info: ipv6 not available"
-    exit 0
+  entrypoint_log "$ME: info: IPv6 is not available"
+  exit 0
 fi
 
 if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
-    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
-    exit 0
+  entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
+  exit 0
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: can not modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: IPv6 listen already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
-    . /etc/os-release
+  . /etc/os-release
 else
-    entrypoint_log "$ME: info: can not guess the operating system"
-    exit 0
+  entrypoint_log "$ME: info: Cannot guess the operating system"
+  exit 0
 fi
 
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-    "debian")
-        CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    "alpine")
-        CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    *)
-        entrypoint_log "$ME: info: Unsupported distribution"
-        exit 0
-        ;;
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/mainline/debian/20-envsubst-on-templates.sh b/mainline/debian/20-envsubst-on-templates.sh
index 3804165c..84af2cd6 100755
--- a/mainline/debian/20-envsubst-on-templates.sh
+++ b/mainline/debian/20-envsubst-on-templates.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 ME=$(basename "$0")
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 add_stream_block() {
@@ -17,9 +18,12 @@ add_stream_block() {
     entrypoint_log "$ME: $conffile contains a stream block; include $stream_output_dir/*.conf to enable stream templates"
   else
     # check if the file can be modified, e.g. not on a r/o filesystem
-    touch "$conffile" 2>/dev/null || { entrypoint_log "$ME: info: can not modify $conffile (read-only file system?)"; exit 0; }
-    entrypoint_log "$ME: Appending stream block to $conffile to include $stream_output_dir/*.conf"
-    cat << END >> "$conffile"
+    touch "$conffile" 2>/dev/null || {
+      entrypoint_log "$ME: ERROR: can not modify $conffile (read-only file system?)"
+      exit 0
+    }
+    entrypoint_log "$ME: info: Appending stream block to $conffile to include $stream_output_dir/*.conf"
+    cat <<END >>"$conffile"
 # added by "$ME" on "$(date)"
 stream {
   include $stream_output_dir/*.conf;
@@ -37,7 +41,8 @@ auto_envsubst() {
   local filter="${NGINX_ENVSUBST_FILTER:-}"
 
   local template defined_envs relative_path output_path subdir
-  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" < /dev/null ))
+
+  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" </dev/null))
   [ -d "$template_dir" ] || return 0
   if [ ! -w "$output_dir" ]; then
     entrypoint_log "$ME: ERROR: $template_dir exists, but $output_dir is not writable"
@@ -49,8 +54,8 @@ auto_envsubst() {
     subdir=$(dirname "$relative_path")
     # create a subdirectory where the template file exists
     mkdir -p "$output_dir/$subdir"
-    entrypoint_log "$ME: Running envsubst on $template to $output_path"
-    envsubst "$defined_envs" < "$template" > "$output_path"
+    entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+    envsubst "$defined_envs" <"$template" >"$output_path"
   done
 
   # Print the first file with the stream suffix, this will be false if there are none
@@ -67,8 +72,8 @@ auto_envsubst() {
       subdir=$(dirname "$relative_path")
       # create a subdirectory where the template file exists
       mkdir -p "$stream_output_dir/$subdir"
-      entrypoint_log "$ME: Running envsubst on $template to $output_path"
-      envsubst "$defined_envs" < "$template" > "$output_path"
+      entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+      envsubst "$defined_envs" <"$template" >"$output_path"
     done
   fi
 }
diff --git a/mainline/debian/30-tune-worker-processes.sh b/mainline/debian/30-tune-worker-processes.sh
index defb994f..52786438 100755
--- a/mainline/debian/30-tune-worker-processes.sh
+++ b/mainline/debian/30-tune-worker-processes.sh
@@ -9,12 +9,15 @@ PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: error: can not modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq $(echo "$token" | tr '-' ' ') | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq $(echo "$token" | tr '-' ' ') | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/mainline/debian/docker-entrypoint.sh b/mainline/debian/docker-entrypoint.sh
index 8ea04f21..ceb10bbb 100755
--- a/mainline/debian/docker-entrypoint.sh
+++ b/mainline/debian/docker-entrypoint.sh
@@ -1,47 +1,47 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 if [ "$1" = "nginx" ] || [ "$1" = "nginx-debug" ]; then
-    if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
-        entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
+  if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
+      entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
 
-        entrypoint_log "$0: Looking for shell scripts in /docker-entrypoint.d/"
-        find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
-            case "$f" in
-                *.envsh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Sourcing $f";
-                        . "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *.sh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Launching $f";
-                        "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *) entrypoint_log "$0: Ignoring $f";;
-            esac
-        done
+    entrypoint_log "$0: info: Looking for shell scripts in /docker-entrypoint.d/"
+    find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
+      case "$f" in
+      *.envsh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Sourcing $f"
+          . "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *.sh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Launching $f"
+          "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *) entrypoint_log "$0: info: Ignoring $f" ;;
+      esac
+    done
 
-        entrypoint_log "$0: Configuration complete; ready for start up"
-    else
-        entrypoint_log "$0: No files found in /docker-entrypoint.d/, skipping configuration"
-    fi
+    entrypoint_log "$0: info: Configuration complete; ready for start up"
+  else
+    entrypoint_log "$0: info: No files found in /docker-entrypoint.d/, skipping configuration"
+  fi
 fi
 
 exec "$@"
diff --git a/modules/echo/prebuild b/modules/echo/prebuild
index cd2864b0..dae374ae 100755
--- a/modules/echo/prebuild
+++ b/modules/echo/prebuild
@@ -1,4 +1,5 @@
 #!/bin/sh
+# vim:sw=2:ts=2:sts=2:et
 
 # if a module has a build dependency that is not in debian/alpine
 # use this script to fetch/build/install them
diff --git a/stable/alpine-slim/10-listen-on-ipv6-by-default.sh b/stable/alpine-slim/10-listen-on-ipv6-by-default.sh
index b90bf0c9..f64d8cf6 100755
--- a/stable/alpine-slim/10-listen-on-ipv6-by-default.sh
+++ b/stable/alpine-slim/10-listen-on-ipv6-by-default.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 ME=$(basename "$0")
@@ -14,49 +14,55 @@ DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
 if [ ! -f "/proc/net/if_inet6" ]; then
-    entrypoint_log "$ME: info: ipv6 not available"
-    exit 0
+  entrypoint_log "$ME: info: IPv6 is not available"
+  exit 0
 fi
 
 if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
-    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
-    exit 0
+  entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
+  exit 0
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: can not modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: IPv6 listen already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
-    . /etc/os-release
+  . /etc/os-release
 else
-    entrypoint_log "$ME: info: can not guess the operating system"
-    exit 0
+  entrypoint_log "$ME: info: Cannot guess the operating system"
+  exit 0
 fi
 
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-    "debian")
-        CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    "alpine")
-        CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    *)
-        entrypoint_log "$ME: info: Unsupported distribution"
-        exit 0
-        ;;
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/stable/alpine-slim/20-envsubst-on-templates.sh b/stable/alpine-slim/20-envsubst-on-templates.sh
index 3804165c..84af2cd6 100755
--- a/stable/alpine-slim/20-envsubst-on-templates.sh
+++ b/stable/alpine-slim/20-envsubst-on-templates.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 ME=$(basename "$0")
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 add_stream_block() {
@@ -17,9 +18,12 @@ add_stream_block() {
     entrypoint_log "$ME: $conffile contains a stream block; include $stream_output_dir/*.conf to enable stream templates"
   else
     # check if the file can be modified, e.g. not on a r/o filesystem
-    touch "$conffile" 2>/dev/null || { entrypoint_log "$ME: info: can not modify $conffile (read-only file system?)"; exit 0; }
-    entrypoint_log "$ME: Appending stream block to $conffile to include $stream_output_dir/*.conf"
-    cat << END >> "$conffile"
+    touch "$conffile" 2>/dev/null || {
+      entrypoint_log "$ME: ERROR: can not modify $conffile (read-only file system?)"
+      exit 0
+    }
+    entrypoint_log "$ME: info: Appending stream block to $conffile to include $stream_output_dir/*.conf"
+    cat <<END >>"$conffile"
 # added by "$ME" on "$(date)"
 stream {
   include $stream_output_dir/*.conf;
@@ -37,7 +41,8 @@ auto_envsubst() {
   local filter="${NGINX_ENVSUBST_FILTER:-}"
 
   local template defined_envs relative_path output_path subdir
-  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" < /dev/null ))
+
+  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" </dev/null))
   [ -d "$template_dir" ] || return 0
   if [ ! -w "$output_dir" ]; then
     entrypoint_log "$ME: ERROR: $template_dir exists, but $output_dir is not writable"
@@ -49,8 +54,8 @@ auto_envsubst() {
     subdir=$(dirname "$relative_path")
     # create a subdirectory where the template file exists
     mkdir -p "$output_dir/$subdir"
-    entrypoint_log "$ME: Running envsubst on $template to $output_path"
-    envsubst "$defined_envs" < "$template" > "$output_path"
+    entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+    envsubst "$defined_envs" <"$template" >"$output_path"
   done
 
   # Print the first file with the stream suffix, this will be false if there are none
@@ -67,8 +72,8 @@ auto_envsubst() {
       subdir=$(dirname "$relative_path")
       # create a subdirectory where the template file exists
       mkdir -p "$stream_output_dir/$subdir"
-      entrypoint_log "$ME: Running envsubst on $template to $output_path"
-      envsubst "$defined_envs" < "$template" > "$output_path"
+      entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+      envsubst "$defined_envs" <"$template" >"$output_path"
     done
   fi
 }
diff --git a/stable/alpine-slim/30-tune-worker-processes.sh b/stable/alpine-slim/30-tune-worker-processes.sh
index defb994f..52786438 100755
--- a/stable/alpine-slim/30-tune-worker-processes.sh
+++ b/stable/alpine-slim/30-tune-worker-processes.sh
@@ -9,12 +9,15 @@ PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: error: can not modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq $(echo "$token" | tr '-' ' ') | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq $(echo "$token" | tr '-' ' ') | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/stable/alpine-slim/docker-entrypoint.sh b/stable/alpine-slim/docker-entrypoint.sh
index 8ea04f21..ceb10bbb 100755
--- a/stable/alpine-slim/docker-entrypoint.sh
+++ b/stable/alpine-slim/docker-entrypoint.sh
@@ -1,47 +1,47 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 if [ "$1" = "nginx" ] || [ "$1" = "nginx-debug" ]; then
-    if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
-        entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
+  if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
+      entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
 
-        entrypoint_log "$0: Looking for shell scripts in /docker-entrypoint.d/"
-        find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
-            case "$f" in
-                *.envsh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Sourcing $f";
-                        . "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *.sh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Launching $f";
-                        "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *) entrypoint_log "$0: Ignoring $f";;
-            esac
-        done
+    entrypoint_log "$0: info: Looking for shell scripts in /docker-entrypoint.d/"
+    find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
+      case "$f" in
+      *.envsh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Sourcing $f"
+          . "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *.sh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Launching $f"
+          "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *) entrypoint_log "$0: info: Ignoring $f" ;;
+      esac
+    done
 
-        entrypoint_log "$0: Configuration complete; ready for start up"
-    else
-        entrypoint_log "$0: No files found in /docker-entrypoint.d/, skipping configuration"
-    fi
+    entrypoint_log "$0: info: Configuration complete; ready for start up"
+  else
+    entrypoint_log "$0: info: No files found in /docker-entrypoint.d/, skipping configuration"
+  fi
 fi
 
 exec "$@"
diff --git a/stable/debian/10-listen-on-ipv6-by-default.sh b/stable/debian/10-listen-on-ipv6-by-default.sh
index b90bf0c9..f64d8cf6 100755
--- a/stable/debian/10-listen-on-ipv6-by-default.sh
+++ b/stable/debian/10-listen-on-ipv6-by-default.sh
@@ -1,12 +1,12 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 ME=$(basename "$0")
@@ -14,49 +14,55 @@ DEFAULT_CONF_FILE="etc/nginx/conf.d/default.conf"
 
 # check if we have ipv6 available
 if [ ! -f "/proc/net/if_inet6" ]; then
-    entrypoint_log "$ME: info: ipv6 not available"
-    exit 0
+  entrypoint_log "$ME: info: IPv6 is not available"
+  exit 0
 fi
 
 if [ ! -f "/$DEFAULT_CONF_FILE" ]; then
-    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
-    exit 0
+  entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE is not a file or does not exist"
+  exit 0
 fi
 
 # check if the file can be modified, e.g. not on a r/o filesystem
-touch /$DEFAULT_CONF_FILE 2>/dev/null || { entrypoint_log "$ME: info: can not modify /$DEFAULT_CONF_FILE (read-only file system?)"; exit 0; }
+touch /$DEFAULT_CONF_FILE 2>/dev/null || {
+  entrypoint_log "$ME: info: Cannot modify /$DEFAULT_CONF_FILE (read-only file system?)"
+  exit 0
+}
 
 # check if the file is already modified, e.g. on a container restart
-grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && { entrypoint_log "$ME: info: IPv6 listen already enabled"; exit 0; }
+grep -q "listen  \[::]\:80;" /$DEFAULT_CONF_FILE && {
+  entrypoint_log "$ME: info: Listen on IPv6 is already enabled"
+  exit 0
+}
 
 if [ -f "/etc/os-release" ]; then
-    . /etc/os-release
+  . /etc/os-release
 else
-    entrypoint_log "$ME: info: can not guess the operating system"
-    exit 0
+  entrypoint_log "$ME: info: Cannot guess the operating system"
+  exit 0
 fi
 
 entrypoint_log "$ME: info: Getting the checksum of /$DEFAULT_CONF_FILE"
 
 case "$ID" in
-    "debian")
-        CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    "alpine")
-        CHECKSUM=$(apk manifest nginx 2>/dev/null| grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
-        echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
-            entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
-            exit 0
-        }
-        ;;
-    *)
-        entrypoint_log "$ME: info: Unsupported distribution"
-        exit 0
-        ;;
+"debian")
+  CHECKSUM=$(dpkg-query --show --showformat='${Conffiles}\n' nginx | grep $DEFAULT_CONF_FILE | cut -d' ' -f 3)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | md5sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+"alpine")
+  CHECKSUM=$(apk manifest nginx 2>/dev/null | grep $DEFAULT_CONF_FILE | cut -d' ' -f 1 | cut -d ':' -f 2)
+  echo "$CHECKSUM  /$DEFAULT_CONF_FILE" | sha1sum -c - >/dev/null 2>&1 || {
+    entrypoint_log "$ME: info: /$DEFAULT_CONF_FILE differs from the packaged version"
+    exit 0
+  }
+  ;;
+*)
+  entrypoint_log "$ME: info: Unsupported distribution"
+  exit 0
+  ;;
 esac
 
 # enable ipv6 on default.conf listen sockets
diff --git a/stable/debian/20-envsubst-on-templates.sh b/stable/debian/20-envsubst-on-templates.sh
index 3804165c..84af2cd6 100755
--- a/stable/debian/20-envsubst-on-templates.sh
+++ b/stable/debian/20-envsubst-on-templates.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 ME=$(basename "$0")
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 add_stream_block() {
@@ -17,9 +18,12 @@ add_stream_block() {
     entrypoint_log "$ME: $conffile contains a stream block; include $stream_output_dir/*.conf to enable stream templates"
   else
     # check if the file can be modified, e.g. not on a r/o filesystem
-    touch "$conffile" 2>/dev/null || { entrypoint_log "$ME: info: can not modify $conffile (read-only file system?)"; exit 0; }
-    entrypoint_log "$ME: Appending stream block to $conffile to include $stream_output_dir/*.conf"
-    cat << END >> "$conffile"
+    touch "$conffile" 2>/dev/null || {
+      entrypoint_log "$ME: ERROR: can not modify $conffile (read-only file system?)"
+      exit 0
+    }
+    entrypoint_log "$ME: info: Appending stream block to $conffile to include $stream_output_dir/*.conf"
+    cat <<END >>"$conffile"
 # added by "$ME" on "$(date)"
 stream {
   include $stream_output_dir/*.conf;
@@ -37,7 +41,8 @@ auto_envsubst() {
   local filter="${NGINX_ENVSUBST_FILTER:-}"
 
   local template defined_envs relative_path output_path subdir
-  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" < /dev/null ))
+
+  defined_envs=$(printf '${%s} ' $(awk "END { for (name in ENVIRON) { print ( name ~ /${filter}/ ) ? name : \"\" } }" </dev/null))
   [ -d "$template_dir" ] || return 0
   if [ ! -w "$output_dir" ]; then
     entrypoint_log "$ME: ERROR: $template_dir exists, but $output_dir is not writable"
@@ -49,8 +54,8 @@ auto_envsubst() {
     subdir=$(dirname "$relative_path")
     # create a subdirectory where the template file exists
     mkdir -p "$output_dir/$subdir"
-    entrypoint_log "$ME: Running envsubst on $template to $output_path"
-    envsubst "$defined_envs" < "$template" > "$output_path"
+    entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+    envsubst "$defined_envs" <"$template" >"$output_path"
   done
 
   # Print the first file with the stream suffix, this will be false if there are none
@@ -67,8 +72,8 @@ auto_envsubst() {
       subdir=$(dirname "$relative_path")
       # create a subdirectory where the template file exists
       mkdir -p "$stream_output_dir/$subdir"
-      entrypoint_log "$ME: Running envsubst on $template to $output_path"
-      envsubst "$defined_envs" < "$template" > "$output_path"
+      entrypoint_log "$ME: info: Running envsubst on $template to $output_path"
+      envsubst "$defined_envs" <"$template" >"$output_path"
     done
   fi
 }
diff --git a/stable/debian/30-tune-worker-processes.sh b/stable/debian/30-tune-worker-processes.sh
index defb994f..52786438 100755
--- a/stable/debian/30-tune-worker-processes.sh
+++ b/stable/debian/30-tune-worker-processes.sh
@@ -9,12 +9,15 @@ PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
 
 [ "${NGINX_ENTRYPOINT_WORKER_PROCESSES_AUTOTUNE:-}" ] || exit 0
 
-touch /etc/nginx/nginx.conf 2>/dev/null || { echo >&2 "$ME: error: can not modify /etc/nginx/nginx.conf (read-only file system?)"; exit 0; }
+touch /etc/nginx/nginx.conf 2>/dev/null || {
+  echo >&2 "$ME: ERROR: Cannot modify /etc/nginx/nginx.conf (read-only file system?)"
+  exit 0
+}
 
 ceildiv() {
   num=$1
   div=$2
-  echo $(( (num + div - 1) / div ))
+  echo $(((num + div - 1) / div))
 }
 
 get_cpuset() {
@@ -22,15 +25,15 @@ get_cpuset() {
   cpusetfile=$2
   ncpu=0
   [ -f "$cpusetroot/$cpusetfile" ] || return 1
-  for token in $( tr ',' ' ' < "$cpusetroot/$cpusetfile" ); do
+  for token in $(tr ',' ' ' <"$cpusetroot/$cpusetfile"); do
     case "$token" in
-      *-*)
-        count=$( seq $(echo "$token" | tr '-' ' ') | wc -l )
-        ncpu=$(( ncpu+count ))
-        ;;
-      *)
-        ncpu=$(( ncpu+1 ))
-        ;;
+    *-*)
+      count=$(seq $(echo "$token" | tr '-' ' ') | wc -l)
+      ncpu=$((ncpu + count))
+      ;;
+    *)
+      ncpu=$((ncpu + 1))
+      ;;
     esac
   done
   echo "$ncpu"
@@ -41,11 +44,11 @@ get_quota() {
   ncpu=0
   [ -f "$cpuroot/cpu.cfs_quota_us" ] || return 1
   [ -f "$cpuroot/cpu.cfs_period_us" ] || return 1
-  cfs_quota=$( cat "$cpuroot/cpu.cfs_quota_us" )
-  cfs_period=$( cat "$cpuroot/cpu.cfs_period_us" )
+  cfs_quota=$(cat "$cpuroot/cpu.cfs_quota_us")
+  cfs_period=$(cat "$cpuroot/cpu.cfs_period_us")
   [ "$cfs_quota" = "-1" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -54,11 +57,11 @@ get_quota_v2() {
   cpuroot=$1
   ncpu=0
   [ -f "$cpuroot/cpu.max" ] || return 1
-  cfs_quota=$( cut -d' ' -f 1 < "$cpuroot/cpu.max" )
-  cfs_period=$( cut -d' ' -f 2 < "$cpuroot/cpu.max" )
+  cfs_quota=$(cut -d' ' -f 1 <"$cpuroot/cpu.max")
+  cfs_period=$(cut -d' ' -f 2 <"$cpuroot/cpu.max")
   [ "$cfs_quota" = "max" ] && return 1
   [ "$cfs_period" = "0" ] && return 1
-  ncpu=$( ceildiv "$cfs_quota" "$cfs_period" )
+  ncpu=$(ceildiv "$cfs_quota" "$cfs_period")
   [ "$ncpu" -gt 0 ] || return 1
   echo "$ncpu"
 }
@@ -74,59 +77,59 @@ get_cgroup_v1_path() {
 
   while IFS= read -r line; do
     case "$needle" in
-      "cpuset")
-        case "$line" in
-          *cpuset*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$line" in
+      *cpuset*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
+        ;;
+      esac
+      ;;
+    "cpu")
+      case "$line" in
+      *cpuset*) ;;
+      *cpu,cpuacct* | *cpuacct,cpu | *cpuacct* | *cpu*)
+        found=$(echo "$line" | cut -d ' ' -f 4,5)
+        break
         ;;
-      "cpu")
-        case "$line" in
-          *cpuset*)
-            ;;
-          *cpu,cpuacct*|*cpuacct,cpu|*cpuacct*|*cpu*)
-            found=$( echo "$line" | cut -d ' ' -f 4,5 )
-            break
-            ;;
-        esac
+      esac
+      ;;
     esac
-  done << __EOF__
-$( grep -F -- '- cgroup ' /proc/self/mountinfo )
+  done <<__EOF__
+$(grep -F -- '- cgroup ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    controller=$( echo "$line" | cut -d: -f 2 )
+    controller=$(echo "$line" | cut -d: -f 2)
     case "$needle" in
-      "cpuset")
-        case "$controller" in
-          cpuset)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+    "cpuset")
+      case "$controller" in
+      cpuset)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
-      "cpu")
-        case "$controller" in
-          cpu,cpuacct|cpuacct,cpu|cpuacct|cpu)
-            mountpoint=$( echo "$line" | cut -d: -f 3 )
-            break
-            ;;
-        esac
+      esac
+      ;;
+    "cpu")
+      case "$controller" in
+      cpu,cpuacct | cpuacct,cpu | cpuacct | cpu)
+        mountpoint=$(echo "$line" | cut -d: -f 3)
+        break
         ;;
+      esac
+      ;;
     esac
-done << __EOF__
-$( grep -F -- 'cpu' /proc/self/cgroup )
+  done <<__EOF__
+$(grep -F -- 'cpu' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint")
-      foundroot="${found##* }"
-      ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint")
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
@@ -140,49 +143,49 @@ get_cgroup_v2_path() {
   [ -r "/proc/self/cgroup" ] || return 1
 
   while IFS= read -r line; do
-    found=$( echo "$line" | cut -d ' ' -f 4,5 )
-  done << __EOF__
-$( grep -F -- '- cgroup2 ' /proc/self/mountinfo )
+    found=$(echo "$line" | cut -d ' ' -f 4,5)
+  done <<__EOF__
+$(grep -F -- '- cgroup2 ' /proc/self/mountinfo)
 __EOF__
 
   while IFS= read -r line; do
-    mountpoint=$( echo "$line" | cut -d: -f 3 )
-done << __EOF__
-$( grep -F -- '0::' /proc/self/cgroup )
+    mountpoint=$(echo "$line" | cut -d: -f 3)
+  done <<__EOF__
+$(grep -F -- '0::' /proc/self/cgroup)
 __EOF__
 
   case "${found%% *}" in
-    "")
-      return 1
-      ;;
-    "/")
-      foundroot="${found##* }$mountpoint"
-      ;;
-    "$mountpoint" | /../*)
-      foundroot="${found##* }"
-      ;;
+  "")
+    return 1
+    ;;
+  "/")
+    foundroot="${found##* }$mountpoint"
+    ;;
+  "$mountpoint" | /../*)
+    foundroot="${found##* }"
+    ;;
   esac
   echo "$foundroot"
 }
 
-ncpu_online=$( getconf _NPROCESSORS_ONLN )
+ncpu_online=$(getconf _NPROCESSORS_ONLN)
 ncpu_cpuset=
 ncpu_quota=
 ncpu_cpuset_v2=
 ncpu_quota_v2=
 
-cpuset=$( get_cgroup_v1_path "cpuset" ) && ncpu_cpuset=$( get_cpuset "$cpuset" "cpuset.effective_cpus" ) || ncpu_cpuset=$ncpu_online
-cpu=$( get_cgroup_v1_path "cpu" ) && ncpu_quota=$( get_quota "$cpu" ) || ncpu_quota=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_cpuset_v2=$( get_cpuset "$cgroup_v2" "cpuset.cpus.effective" ) || ncpu_cpuset_v2=$ncpu_online
-cgroup_v2=$( get_cgroup_v2_path ) && ncpu_quota_v2=$( get_quota_v2 "$cgroup_v2" ) || ncpu_quota_v2=$ncpu_online
-
-ncpu=$( printf "%s\n%s\n%s\n%s\n%s\n" \
-               "$ncpu_online" \
-               "$ncpu_cpuset" \
-               "$ncpu_quota" \
-               "$ncpu_cpuset_v2" \
-               "$ncpu_quota_v2" \
-               | sort -n \
-               | head -n 1 )
+cpuset=$(get_cgroup_v1_path "cpuset") && ncpu_cpuset=$(get_cpuset "$cpuset" "cpuset.effective_cpus") || ncpu_cpuset=$ncpu_online
+cpu=$(get_cgroup_v1_path "cpu") && ncpu_quota=$(get_quota "$cpu") || ncpu_quota=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_cpuset_v2=$(get_cpuset "$cgroup_v2" "cpuset.cpus.effective") || ncpu_cpuset_v2=$ncpu_online
+cgroup_v2=$(get_cgroup_v2_path) && ncpu_quota_v2=$(get_quota_v2 "$cgroup_v2") || ncpu_quota_v2=$ncpu_online
+
+ncpu=$(printf "%s\n%s\n%s\n%s\n%s\n" \
+  "$ncpu_online" \
+  "$ncpu_cpuset" \
+  "$ncpu_quota" \
+  "$ncpu_cpuset_v2" \
+  "$ncpu_quota_v2" |
+  sort -n |
+  head -n 1)
 
 sed -i.bak -r 's/^(worker_processes)(.*)$/# Commented out by '"$ME"' on '"$(date)"'\n#\1\2\n\1 '"$ncpu"';/' /etc/nginx/nginx.conf
diff --git a/stable/debian/docker-entrypoint.sh b/stable/debian/docker-entrypoint.sh
index 8ea04f21..943656ff 100755
--- a/stable/debian/docker-entrypoint.sh
+++ b/stable/debian/docker-entrypoint.sh
@@ -1,47 +1,47 @@
 #!/bin/sh
-# vim:sw=4:ts=4:et
+# vim:sw=2:ts=2:sts=2:et
 
 set -e
 
 entrypoint_log() {
-    if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
-        echo "$@"
-    fi
+  if [ -z "${NGINX_ENTRYPOINT_QUIET_LOGS:-}" ]; then
+    echo "$@"
+  fi
 }
 
 if [ "$1" = "nginx" ] || [ "$1" = "nginx-debug" ]; then
-    if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
-        entrypoint_log "$0: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
+  if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
+    entrypoint_log "$0: info: /docker-entrypoint.d/ is not empty, will attempt to perform configuration"
 
-        entrypoint_log "$0: Looking for shell scripts in /docker-entrypoint.d/"
-        find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
-            case "$f" in
-                *.envsh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Sourcing $f";
-                        . "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *.sh)
-                    if [ -x "$f" ]; then
-                        entrypoint_log "$0: Launching $f";
-                        "$f"
-                    else
-                        # warn on shell scripts without exec bit
-                        entrypoint_log "$0: Ignoring $f, not executable";
-                    fi
-                    ;;
-                *) entrypoint_log "$0: Ignoring $f";;
-            esac
-        done
+    entrypoint_log "$0: info: Looking for shell scripts in /docker-entrypoint.d/"
+    find "/docker-entrypoint.d/" -follow -type f -print | sort -V | while read -r f; do
+      case "$f" in
+      *.envsh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Sourcing $f"
+          . "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *.sh)
+        if [ -x "$f" ]; then
+          entrypoint_log "$0: info: Launching $f"
+          "$f"
+        else
+          # warn on shell scripts without exec bit
+          entrypoint_log "$0: info: Ignoring $f, not executable"
+        fi
+        ;;
+      *) entrypoint_log "$0: info: Ignoring $f" ;;
+      esac
+    done
 
-        entrypoint_log "$0: Configuration complete; ready for start up"
-    else
-        entrypoint_log "$0: No files found in /docker-entrypoint.d/, skipping configuration"
-    fi
+    entrypoint_log "$0: info: Configuration complete; ready for start up"
+  else
+    entrypoint_log "$0: info: No files found in /docker-entrypoint.d/, skipping configuration"
+  fi
 fi
 
 exec "$@"
diff --git a/update.sh b/update.sh
index 269b3536..9965de5c 100755
--- a/update.sh
+++ b/update.sh
@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+# vim:sw=4:ts=4:sts=4:et
+
 set -Eeuo pipefail
 shopt -s nullglob
 
@@ -120,27 +122,27 @@ get_packagever() {
 
     [ "${distro}" = "debian" ] && suffix="~${debianver}"
 
-    echo ${pkg[$branch]}${suffix}
+    echo "${pkg[$branch]}${suffix}"
 }
 
 get_buildtarget() {
     local distro="$1"
     case "$distro" in
-        alpine-slim)
-            echo base
-            ;;
-        alpine-perl)
-            echo module-perl
-            ;;
-        alpine)
-            echo module-geoip module-image-filter module-njs module-xslt
-            ;;
-        debian)
-            echo "\$nginxPackages"
-            ;;
-        debian-perl)
-            echo "nginx-module-perl=\${NGINX_VERSION}-\${PKG_RELEASE}"
-            ;;
+    alpine-slim)
+        echo base
+        ;;
+    alpine-perl)
+        echo module-perl
+        ;;
+    alpine)
+        echo module-geoip module-image-filter module-njs module-xslt
+        ;;
+    debian)
+        echo "\$nginxPackages"
+        ;;
+    debian-perl)
+        echo "nginx-module-perl=\${NGINX_VERSION}-\${PKG_RELEASE}"
+        ;;
     esac
 }
 
@@ -194,12 +196,11 @@ for branch in "${branches[@]}"; do
             -e 's,%%PKGOSSCHECKSUM%%,'"$pkgosschecksumver"',' \
             -e 's,%%BUILDTARGET%%,'"$buildtarget"',' \
             "$dir/Dockerfile"
-
     done
 
     for variant in \
         alpine-slim \
-        debian; do \
+        debian; do
         echo "$branch: $variant entrypoint scripts"
         dir="$branch/$variant"
         cp -a entrypoint/*.sh "$dir/"