more docs

contrib/docker/shared/root/docker/entrypoint.d/05-templating.sh

@@ -42,7 +42,7 @@ find "${ENTRYPOINT_TEMPLATE_DIR}" -follow -type f -print | while read -r templat
     fi
 
     # Create the output directory if it doesn't exists
-    ensure-directory "${output_file_dir}"
+    ensure-directory-exists "${output_file_dir}"
 
     # Render the template
     log-info "Running [gomplate] on [${template_file}] --> [${output_file_path}]"

contrib/docker/shared/root/docker/entrypoint.sh

@@ -1,37 +1,48 @@
 #!/bin/bash
+# short curcuit the entrypoint if $ENTRYPOINT_SKIP isn't set to 0
 if [[ ${ENTRYPOINT_SKIP:=0} != 0 ]]; then
     exec "$@"
 fi
 
+# Directory where entrypoint scripts lives
 : ${ENTRYPOINT_ROOT:="/docker/entrypoint.d/"}
-: ${ENTRYPOINT_SKIP_SCRIPTS:=""}
-
 export ENTRYPOINT_ROOT
 
+# Space separated list of scripts the entrypoint runner should skip
+: ${ENTRYPOINT_SKIP_SCRIPTS:=""}
+
+# Load helper scripts
 source /docker/helpers.sh
 
+# Set the entrypoint name for logging
 entrypoint-set-name "entrypoint.sh"
 
+# Convert ENTRYPOINT_SKIP_SCRIPTS into a native bash array for easier lookup
 declare -a skip_scripts
 IFS=' ' read -a skip_scripts <<<"$ENTRYPOINT_SKIP_SCRIPTS"
 
-declare script_name
-
-# ensure the entrypoint folder exists
+# Ensure the entrypoint root folder exists
 mkdir -p "${ENTRYPOINT_ROOT}"
 
-if /usr/bin/find "${ENTRYPOINT_ROOT}" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v; then
-    log-info "looking for shell scripts in /docker/entrypoint.d/"
+# If ENTRYPOINT_ROOT directory is empty, warn and run the regular command
+if is-directory-empty "${ENTRYPOINT_ROOT}"; then
+    log-warning "No files found in ${ENTRYPOINT_ROOT}, skipping configuration"
 
-    find "${ENTRYPOINT_ROOT}" -follow -type f -print | sort -V | while read -r file; do
-        script_name="$(get-entrypoint-script-name $file)"
+    exec "$@"
+fi
+
+# Start scanning for entrypoint.d files to source or run
+log-info "looking for shell scripts in [${ENTRYPOINT_ROOT}]"
 
-        if in-array "${script_name}" skip_scripts; then
+find "${ENTRYPOINT_ROOT}" -follow -type f -print | sort -V | while read -r file; do
+    # Skip the script if it's in the skip-script list
+    if in-array $(get-entrypoint-script-name "${file}") skip_scripts; then
         log-warning "Skipping script [${script_name}] since it's in the skip list (\$ENTRYPOINT_SKIP_SCRIPTS)"
 
         continue
     fi
 
+    # Inspect the file extension of the file we're processing
     case "${file}" in
     *.envsh)
         if ! is-executable "${file}"; then
@@ -65,8 +76,5 @@ if /usr/bin/find "${ENTRYPOINT_ROOT}" -mindepth 1 -maxdepth 1 -type f -print -qu
 done
 
 log-info "Configuration complete; ready for start up"
-else
-    log-warning "No files found in ${ENTRYPOINT_ROOT}, skipping configuration"
-fi
 
 exec "$@"

contrib/docker/shared/root/docker/helpers.sh

@@ -23,15 +23,22 @@ declare -ra dot_env_files=(
 # environment keys seen when source dot files (so we can [export] them)
 declare -ga seen_dot_env_variables=()
 
+# @description Restore the log prefix to the previous value that was captured in [entrypoint-set-name]
+# @arg $1 string The name (or path) of the entrypoint script being run
 function entrypoint-set-name() {
     log_prefix_previous="${log_prefix}"
     log_prefix="ENTRYPOINT - [$(get-entrypoint-script-name $1)] - "
 }
 
+# @description Restore the log prefix to the previous value that was captured in [entrypoint-set-name]
 function entrypoint-restore-name() {
     log_prefix="${log_prefix_previous}"
 }
 
+# @description Run a command as the [runtime user]
+# @arg $@ string The command to run
+# @exitcode 0 if the command succeeeds
+# @exitcode 1 if the command fails
 function run-as-runtime-user() {
     local -i exit_code
     local target_user
@@ -54,12 +61,14 @@ function run-as-runtime-user() {
 
 # @description Print the given error message to stderr
 # @arg $message string A error message.
+# @stderr The error message provided with log prefix
 function log-error() {
     echo -e "${error_message_color}${log_prefix}ERROR - ${*}${color_clear}" >/dev/stderr
 }
 
 # @description Print the given error message to stderr and exit 1
 # @arg $@ string A error message.
+# @stderr The error message provided with log prefix
 # @exitcode 1
 function log-error-and-exit() {
     log-error "$@"
@@ -69,18 +78,22 @@ function log-error-and-exit() {
 
 # @description Print the given warning message to stderr
 # @arg $@ string A warning message.
+# @stderr The warning message provided with log prefix
 function log-warning() {
     echo -e "${warn_message_color}${log_prefix}WARNING - ${*}${color_clear}" >/dev/stderr
 }
 
-# @description Print the given message to stderr unless [ENTRYPOINT_QUIET_LOGS] is set
-# @arg $@ string A warning message.
+# @description Print the given message to stdout unless [ENTRYPOINT_QUIET_LOGS] is set
+# @arg $@ string A info message.
+# @stdout The info message provided with log prefix unless $ENTRYPOINT_QUIET_LOGS
 function log-info() {
     if [ -z "${ENTRYPOINT_QUIET_LOGS:-}" ]; then
         echo "${log_prefix}$*"
     fi
 }
 
+# @description Loads the dot-env files used by Docker and track the keys present in the configuration.
+# @sets seen_dot_env_variables array List of config keys discovered during loading
 function load-config-files() {
     # Associative array (aka map/dictionary) holding the unique keys found in dot-env files
     local -A _tmp_dot_env_keys
@@ -103,6 +116,11 @@ function load-config-files() {
     seen_dot_env_variables=(${!_tmp_dot_env_keys[@]})
 }
 
+# @description Checks if $needle exists in $haystack
+# @arg $1 string The needle (value) to search for
+# @arg $2 array  The haystack (array) to search in
+# @exitcode 0 If $needle was found in $haystack
+# @exitcode 1 If $needle was *NOT* found in $haystack
 function in-array() {
     local -r needle="\<${1}\>"
     local -nr haystack=$2
@@ -110,18 +128,41 @@ function in-array() {
     [[ ${haystack[*]} =~ $needle ]]
 }
 
+# @description Checks if $1 has executable bit set or not
+# @arg $1 string The path to check
+# @exitcode 0 If $1 has executable bit
+# @exitcode 1 If $1 does *NOT* have executable bit
 function is-executable() {
     [[ -x "$1" ]]
 }
 
+# @description Checks if $1 is writable or not
+# @arg $1 string The path to check
+# @exitcode 0 If $1 is writable
+# @exitcode 1 If $1 is *NOT* writable
 function is-writable() {
     [[ -w "$1" ]]
 }
 
-function ensure-directory() {
+# @description Checks if $1 contains any files or not
+# @arg $1 string The path to check
+# @exitcode 0 If $1 contains files
+# @exitcode 1 If $1 does *NOT* contain files
+function is-directory-empty() {
+    ! find "${1}" -mindepth 1 -maxdepth 1 -type f -print -quit 2>/dev/null | read v
+}
+
+# @description Ensures a directory exists (via mkdir)
+# @arg $1 string The path to create
+# @exitcode 0 If $1 If the path exists *or* was created
+# @exitcode 1 If $1 If the path does *NOT* exists and could *NOT* be created
+function ensure-directory-exists() {
     mkdir -pv "$@"
 }
 
+# @description Find the relative path for a entrypoint script by removing the ENTRYPOINT_ROOT prefix
+# @arg $1 string The path to manipulate
+# @stdout The relative path to the entrypoint script
 function get-entrypoint-script-name() {
     echo "${1#"$ENTRYPOINT_ROOT"}"
 }