fix: shellcheck errors (#263)

Co-authored-by: Michael Kriese <[email protected]>

src/usr/local/bin/install-buildpack

@@ -104,7 +104,7 @@ apt_install \
 
 # check for /usr/local/share/ca-certificates/*.crt
 
-if [[ "$(find /usr/local/share/ca-certificates/ -name *.crt -type f -printf '.' | wc -c)" -gt 0 ]]; then
+if [[ "$(find /usr/local/share/ca-certificates/ -name "*.crt" -type f -printf '.' | wc -c)" -gt 0 ]]; then
   echo "Found user certs, calling update-ca-certificates"
   update-ca-certificates
 fi

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

@@ -17,9 +17,9 @@ if [[ -d "${DOTNET_INSTALL_DIR}/sdk/${TOOL_VERSION}" ]]; then
   exit 0
 fi
 
-VERSION_CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
+version_codename=$(get_distro)
 
-case "$VERSION_CODENAME" in
+case "$version_codename" in
   "bionic") apt_install libc6 libgcc1 libgssapi-krb5-2 libicu60 libssl1.1 libstdc++6 zlib1g;;
   "focal") apt_install libc6 libgcc1 libgssapi-krb5-2 libicu66 libssl1.1 libstdc++6 zlib1g;;
 esac

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

@@ -3,9 +3,10 @@
 set -e
 
 require_root
-VERSION_CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
 
-echo "deb http://ppa.launchpad.net/git-core/ppa/ubuntu ${VERSION_CODENAME} main" | tee /etc/apt/sources.list.d/git.list
+version_codename=$(get_distro)
+
+echo "deb http://ppa.launchpad.net/git-core/ppa/ubuntu ${version_codename} main" | tee /etc/apt/sources.list.d/git.list
 curl -sSL \
   'http://keyserver.ubuntu.com/pks/lookup?op=get&search=0xE1DD270288B4E6030699E45FA1715D88E1DF1F24' \
   | apt-key add -

src/usr/local/buildpack/tools/java-jre.sh

@@ -4,6 +4,7 @@ set -e
 
 check_semver "$TOOL_VERSION"
 
+# shellcheck disable=SC2153
 if [[ ! "${MAJOR}" || ! "${MINOR}" || ! "${PATCH}" ]]; then
   echo Invalid version: "${TOOL_VERSION}"
   exit 1

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

@@ -4,6 +4,7 @@ set -e
 
 check_semver "$TOOL_VERSION"
 
+# shellcheck disable=SC2153
 if [[ ! "${MAJOR}" || ! "${MINOR}" || ! "${PATCH}" ]]; then
   echo Invalid version: "${TOOL_VERSION}"
   exit 1

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

@@ -16,6 +16,8 @@ PREFIX="${USER_HOME}/.npm-global"
 
 
 function update_env () {
+  local tool_env
+
   reset_tool_env
 
   link_wrapper "${TOOL_NAME}" "$tool_path/bin"
@@ -24,7 +26,9 @@ function update_env () {
 
   export_tool_path "${PREFIX}/bin"
 
-  cat >> $(find_tool_env) <<- EOM
+  tool_env=$(find_tool_env)
+
+  cat >> "$tool_env" <<- EOM
 # openshift override unknown user home
 if [ "\${EUID}" != 0 ] && [ "\${EUID}" != ${USER_ID} ]; then
   export NPM_CONFIG_PREFIX="${PREFIX}"
@@ -47,7 +51,7 @@ function prepare_global_config () {
 
 function prepare_user_config () {
   local prefix=${1}
-  if [[ -r "${USER_HOME}/.npmrc" && $(cat "${USER_HOME}/.npmrc" | grep 'prefix') ]]; then
+  if grep 'prefix' "${USER_HOME}/.npmrc"; then
     return
   fi
 

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

@@ -22,12 +22,13 @@ if [[ -z "${tool_path}" ]]; then
   file=/tmp/php.tar.xz
 
   ARCH=$(uname -p)
-  CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
   BASE_URL="https://github.com/containerbase/php-prebuild/releases/download"
 
+  version_codename=$(get_distro)
+
    # TODO: extract to separate preparation tool
   require_root
-  case "$CODENAME" in
+  case "$version_codename" in
     "bionic") apt_install \
       libjpeg-turbo8 \
       libmcrypt4 \
@@ -48,7 +49,7 @@ if [[ -z "${tool_path}" ]]; then
       ;;
   esac
 
-  curl -sSfLo ${file} "${BASE_URL}/${TOOL_VERSION}/php-${TOOL_VERSION}-${CODENAME}-${ARCH}.tar.xz"
+  curl -sSfLo ${file} "${BASE_URL}/${TOOL_VERSION}/php-${TOOL_VERSION}-${version_codename}-${ARCH}.tar.xz"
 
   if [[ -f ${file} ]]; then
     echo 'Using prebuild php'

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

@@ -18,9 +18,9 @@ if [[ -z "${tool_path}" ]]; then
   base_path=${INSTALL_DIR}/${TOOL_NAME}
   tool_path=${base_path}/${TOOL_VERSION}
 
-  VERSION_CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
+  version_codename=$(get_distro)
 
-  case "$VERSION_CODENAME" in
+  case "$version_codename" in
     "bionic") apt_install libc6 libgcc1 libgssapi-krb5-2 libicu60 libssl1.1 libstdc++6 zlib1g;;
     "focal") apt_install libc6 libgcc1 libgssapi-krb5-2 libicu66 libssl1.1 libstdc++6 zlib1g;;
   esac

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

@@ -22,10 +22,11 @@ if [[ -z "${tool_path}" ]]; then
   file=/tmp/python.tar.xz
 
   ARCH=$(uname -p)
-  CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
   PYTHON_URL="https://github.com/containerbase/python-prebuild/releases/download"
 
-  curl -sSfLo ${file} "${PYTHON_URL}/${TOOL_VERSION}/python-${TOOL_VERSION}-${CODENAME}-${ARCH}.tar.xz" || echo 'Ignore download error'
+  version_codename=$(get_distro)
+
+  curl -sSfLo ${file} "${PYTHON_URL}/${TOOL_VERSION}/python-${TOOL_VERSION}-${version_codename}-${ARCH}.tar.xz" || echo 'Ignore download error'
 
   if [[ -f ${file} ]]; then
     echo 'Using prebuild python'
@@ -56,7 +57,9 @@ if [[ -z "${tool_path}" ]]; then
   fi
 
   fix_python_shebangs() {
-    for file in $(find "${tool_path}/bin" -type f -exec grep -Iq . {} \; -print); do
+    # https://github.com/koalaman/shellcheck/wiki/SC2044
+    while IFS= read -r -d '' file
+    do
       case "$(head -1 "${file}")" in
       "#!"*"/bin/python" )
         sed -i "1 s:.*:#\!${tool_path}\/bin\/python:" "${file}"
@@ -68,7 +71,7 @@ if [[ -z "${tool_path}" ]]; then
         sed -i "1 s:.*:#\!${tool_path}\/bin\/python${MAJOR}.${MINOR}:" "${file}"
         ;;
       esac
-    done
+    done < <(find "${tool_path}/bin" -type f -exec grep -Iq . {} \; -print0)
   }
 
   fix_python_shebangs

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

@@ -19,13 +19,14 @@ if [[ ! -d "$tool_path" ]]; then
   mkdir -p "$base_path"
 
   ARCH=$(uname -p)
-  CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
   RUBY_URL="https://github.com/containerbase/ruby-prebuild/releases/download"
 
-  curl -sSfLo ruby.tar.xz "${RUBY_URL}/${TOOL_VERSION}/ruby-${TOOL_VERSION}-${CODENAME}-${ARCH}.tar.xz" || echo 'Ignore download error'
+  version_codename=$(get_distro)
+
+  curl -sSfLo ruby.tar.xz "${RUBY_URL}/${TOOL_VERSION}/ruby-${TOOL_VERSION}-${version_codename}-${ARCH}.tar.xz" || echo 'Ignore download error'
 
   if [[ -f ruby.tar.xz ]]; then
-    echo "Using prebuild ruby for ${CODENAME}"
+    echo "Using prebuild ruby for ${version_codename}"
     apt_install \
       build-essential \
       libffi-dev \

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

@@ -14,13 +14,16 @@ base_path=/usr/local/buildpack/${TOOL_NAME}
 tool_path=$base_path/$TOOL_VERSION
 
 if [[ ! -d "${tool_path}" ]]; then
-  VERSION_CODENAME=$(. /etc/os-release && echo "${VERSION_CODENAME}")
+
+  version_codename=$(get_distro)
+
+  # shellcheck source=/dev/null
   VERSION_ID=$(. /etc/os-release && echo "${VERSION_ID}")
 
   # https://swift.org/getting-started/#on-linux
   # already installed: git
 
-  case "$VERSION_CODENAME" in
+  case "${version_codename}" in
     "bionic")
       apt_install \
         binutils \

src/usr/local/buildpack/util.sh

@@ -190,6 +190,12 @@ function require_distro () {
   esac
 }
 
+function get_distro() {
+  require_distro
+  # shellcheck source=/dev/null disable=SC2005
+  echo "$(. /etc/os-release && echo "${VERSION_CODENAME}")"
+}
+
 function require_root () {
   if [[ $EUID -ne 0 ]]; then
     echo "This script must be run as root" >&2