feat: allow helm non-root install (#180)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

src/usr/local/buildpack/tools/helm.sh

@@ -2,7 +2,6 @@
 
 set -e
 
-require_root
 check_semver ${TOOL_VERSION}
 
 
@@ -11,18 +10,30 @@ if [[ ! "${MAJOR}" || ! "${MINOR}" || ! "${PATCH}" ]]; then
   exit 1
 fi
 
-if [[ -d "/usr/local/${TOOL_NAME}/${TOOL_VERSION}" ]]; then
-  echo "Skipping, already installed"
-  exit 0
-fi
+tool_path=$(find_tool_path)
 
-mkdir -p /usr/local/${TOOL_NAME}/${TOOL_VERSION}
-curl -sSL https://get.helm.sh/helm-v${TOOL_VERSION}-linux-amd64.tar.gz --output helm.tgz
-tar --strip 1 -C /usr/local/${TOOL_NAME}/${TOOL_VERSION} -xzf helm.tgz
-rm helm.tgz
+function update_env () {
+  PATH="${1}:${PATH}"
+  link_wrapper ${TOOL_NAME}
+}
 
-export_path "/usr/local/${TOOL_NAME}/${TOOL_VERSION}"
+if [[ -z "${tool_path}" ]]; then
+  INSTALL_DIR=$(get_install_dir)
+  base_path=${INSTALL_DIR}/${TOOL_NAME}
+  tool_path=${base_path}/${TOOL_VERSION}
 
-helm version
+  mkdir -p ${tool_path}
+
+  file=/tmp/${TOOL_NAME}.tgz
+
+  curl -sSfLo ${file} https://get.helm.sh/helm-v${TOOL_VERSION}-linux-amd64.tar.gz
+  tar --strip 1 -C ${tool_path} -xf ${file}
+  rm ${file}
 
-shell_wrapper helm
+  update_env ${tool_path}
+else
+  echo "Already installed, resetting env"
+  update_env ${tool_path}
+fi
+
+helm version

test/helm/Dockerfile

@@ -1,17 +1,17 @@
 ARG IMAGE=containerbase/buildpack
 FROM ${IMAGE} as build
 
+USER 1000
+
 # renovate: datasource=github-releases lookupName=helm/helm
 RUN install-tool helm v3.7.1
 
-USER 1000
-
 RUN set -ex; helm version
 
 RUN set -ex; \
   helm repo add stable https://charts.helm.sh/stable; \
   helm repo update
 
-
 SHELL [ "/bin/sh", "-c" ]
+
 RUN helm version