EagleCast

docker-entrypoint.sh

@@ -0,0 +1,75 @@
+#!/bin/sh
+
+set -e
+
+export PUID=${PUID:-0}
+export PGID=${PGID:-0}
+export GROUP_NAME="app"
+export USER_NAME="app"
+
+# This function evaluates if the supplied PGID is already in use
+# if it is not in use, it creates the group with the PGID
+# if it is in use, it sets the GROUP_NAME to the existing group
+create_group() {
+  if ! getent group ${PGID} > /dev/null 2>&1; then
+    addgroup -g ${PGID} ${GROUP_NAME}
+  else
+    existing_group=$(getent group ${PGID} | cut -d: -f1)
+    export GROUP_NAME=${existing_group}
+  fi
+}
+
+# This function evaluates if the supplied PUID is already in use
+# if it is not in use, it creates the user with the PUID and PGID
+create_user() {
+  if ! getent passwd ${PUID} > /dev/null 2>&1; then
+    adduser -u ${PUID} -G ${GROUP_NAME} -s /bin/sh -D ${USER_NAME}
+  else
+    existing_user=$(getent passwd ${PUID} | cut -d: -f1)
+    export USER_NAME=${existing_user}
+  fi
+}
+
+# Run the needed functions to create the user and group
+create_group
+create_user
+
+load_secret_files() {
+  # Save and restore IFS
+  old_ifs="$IFS"
+  IFS='
+'
+  # Capture all env variables starting with EAGLECAST_ and ending with _FILE.
+  # It's value is assumed to be a file path with its actual value.
+  for line in $(env | grep '^EAGLECAST_.*_FILE='); do
+    var="${line%%=*}"
+    fpath="${line#*=}"
+
+    # If it's a valid file, read its contents and assign it to the var
+    # without the _FILE suffix.
+    # Eg: EAGLECAST_DB_USER_FILE=/run/secrets/user -> EAGLECAST_DB_USER=$(contents of /run/secrets/user)
+    if [ -f "$fpath" ]; then
+      new_var="${var%_FILE}"
+      export "$new_var"="$(cat "$fpath")"
+    fi
+  done
+  IFS="$old_ifs"
+}
+
+# Load env variables from files if EAGLECAST_*_FILE variables are set.
+load_secret_files
+
+# Try to set the ownership of the app directory to the app user.
+if ! chown -R ${PUID}:${PGID} /eaglecast 2>/dev/null; then
+  echo "Warning: Failed to change ownership of /eaglecast. Readonly volume?"
+fi
+
+echo "Launching eaglecast with user=[${USER_NAME}] group=[${GROUP_NAME}] PUID=[${PUID}] PGID=[${PGID}]"
+
+# If running as root and PUID is not 0, then execute command as PUID
+# this allows us to run the container as a non-root user
+if [ "$(id -u)" = "0" ] && [ "${PUID}" != "0" ]; then
+  su-exec ${PUID}:${PGID} "$@"
+else
+  exec "$@"
+fi