Update README.md, make hooks identifiable in logs

cmake/linux/apprun-hooks/README.md

@@ -1,3 +1,11 @@
-When placed in `LMMS.AppDir/apprun-hooks`, linuxdeploy will automatically add scripts to startup.
+# AppRun Hooks
+
+Scripts placed in this directory will automatically be bundled into AppImages
+(e.g. `LMMS.AppDir/apprun-hooks`) and executed immediately before lmms.
+
+Quoting:
+
+> "Sometimes it's important to perform actions before running the actual app.  Some plugins might have to set e.g., 
+> environment variables to work properly."
 
 See also: https://github.com/linuxdeploy/linuxdeploy/wiki/Plugin-system#apprun-hooks

cmake/linux/apprun-hooks/carla-hook.sh

@@ -2,6 +2,7 @@
 
 # Workaround nuances with carla being an optional-yet-hard-linked plugin
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )/.." && pwd )"
+ME="$( basename "${BASH_SOURCE[0]}")"
 CARLA_LIB="libcarla_native-plugin.so"
 KNOWN_LOCATIONS=("lib" "lib64")
 
@@ -17,12 +18,12 @@ if command -v carla > /dev/null 2>&1; then
 			# Add library to LD_PRELOAD so libcarlabase.so can find it
 			carla_lib_found=true
 			export LD_PRELOAD="$CARLA_PREFIX/$lib/carla/${CARLA_LIB}:$LD_PRELOAD"
-			echo "Carla appears to be installed on this system at $CARLA_PREFIX/$lib so we'll use it." >&2
+			echo "[$ME] Carla appears to be installed on this system at $CARLA_PREFIX/$lib/carla so we'll use it." >&2
 			break
 		fi
 	done
 else
-	echo "Carla does not appear to be installed.  That's OK, please ignore any related library errors." >&2
+	echo "[$ME] Carla does not appear to be installed.  That's OK, please ignore any related library errors." >&2
 fi
 
 # Additional workarounds for library conflicts
@@ -43,13 +44,13 @@ if [ "$carla_lib_found" = true ]; then
 					conflict_sys="$("$cmd" -p |grep "$(arch)" |grep "$conflict" |head -n 1 |awk '{print $4}')"
 					if [ -e "$conflict_sys" ]; then
 						# Add library to LD_PRELOAD so lmms can find it over its bundled version
-						echo "Preferring the system's $conflict over the version we bundle." >&2
+						echo "[$ME] Preferring the system's $conflict over the version we bundle." >&2
 						export LD_PRELOAD="$conflict_sys:$LD_PRELOAD"
 					fi
 				fi
 			fi
 		done
 	else
-		echo "Unable to locate ldconfig, skipping workaround for" "${KNOWN_CONFLICTS[@]}" >&2
+		echo "[$ME] Unable to locate ldconfig, skipping workaround for" "${KNOWN_CONFLICTS[@]}" >&2
 	fi
 fi

cmake/linux/apprun-hooks/jack-hook.sh

@@ -2,9 +2,10 @@
 
 # Workaround crash when jack is missing by providing a dummy version
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )/.." && pwd )"
+ME="$( basename "${BASH_SOURCE[0]}")"
 if ldconfig -p | grep libjack.so.0 > /dev/null 2>&1; then
-   echo "Jack appears to be installed on this system, so we'll use it." >&2
+   echo "[$ME] Jack appears to be installed on this system, so we'll use it." >&2
 else
-   echo "Jack does not appear to be installed.  That's OK, we'll use a dummy version instead." >&2
+   echo "[$ME] Jack does not appear to be installed.  That's OK, we'll use a dummy version instead." >&2
    export LD_LIBRARY_PATH=$DIR/usr/lib/lmms/optional:$LD_LIBRARY_PATH
 fi

cmake/linux/apprun-hooks/vbox-hook.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
-
+ME="$( basename "${BASH_SOURCE[0]}")"
 # Workaround crash in VirtualBox when hardware rendering is enabled
 if lsmod |grep vboxguest > /dev/null 2>&1; then
-   echo "VirtualBox detected.  Forcing libgl software rendering." >&2
+   echo "[$ME] VirtualBox detected.  Forcing libgl software rendering." >&2
    export LIBGL_ALWAYS_SOFTWARE=1;
 fi