Small refactor of user/groups and add checks during startup. Only use -x in bash scripts when DEBUG=true set in env vars

Author: jc21

docker/rootfs/bin/common.sh

@@ -12,6 +12,11 @@ export CYAN BLUE YELLOW RED RESET
 PUID=${PUID:-0}
 PGID=${PGID:-0}
 
+NPMUSER=npm
+NPMGROUP=npm
+NPMHOME=/tmp/npmuserhome
+export NPMUSER NPMGROUP NPMHOME
+
 if [[ "$PUID" -ne '0' ]] && [ "$PGID" = '0' ]; then
 	# set group id to same as user id,
 	# the user probably forgot to specify the group id and
@@ -40,3 +45,10 @@ log_fatal () {
 	/run/s6/basedir/bin/halt
 	exit 1
 }
+
+# param $1: group_name
+get_group_id () {
+	if [ "${1:-}" != '' ]; then
+		getent group "$1" | cut -d: -f3
+	fi
+}

docker/rootfs/etc/nginx/nginx.conf

@@ -1,7 +1,7 @@
 # run nginx in foreground
 daemon off;
 pid /run/nginx/nginx.pid;
-user npmuser;
+user npm;
 
 # Set number of worker processes automatically based on number of CPU cores.
 worker_processes auto;

docker/rootfs/etc/s6-overlay/s6-rc.d/backend/run

@@ -12,12 +12,12 @@ cd /app || exit 1
 log_info 'Starting backend ...'
 
 if [ "${DEVELOPMENT:-}" = 'true' ]; then
-	s6-setuidgid npmuser yarn install
-	exec s6-setuidgid npmuser bash -c 'export HOME=/tmp/npmuserhome;node --max_old_space_size=250 --abort_on_uncaught_exception node_modules/nodemon/bin/nodemon.js'
+	s6-setuidgid "$PUID:$PGID" yarn install
+	exec s6-setuidgid "$PUID:$PGID" bash -c "export HOME=$NPMHOME;node --max_old_space_size=250 --abort_on_uncaught_exception node_modules/nodemon/bin/nodemon.js"
 else
 	while :
 	do
-		s6-setuidgid npmuser bash -c 'export HOME=/tmp/npmuserhome;node --abort_on_uncaught_exception --max_old_space_size=250 index.js'
+		s6-setuidgid "$PUID:$PGID" bash -c "export HOME=$NPMHOME;node --abort_on_uncaught_exception --max_old_space_size=250 index.js"
 		sleep 1
 	done
 fi

docker/rootfs/etc/s6-overlay/s6-rc.d/frontend/run

@@ -8,14 +8,14 @@ set -e
 if [ "$DEVELOPMENT" = 'true' ]; then
 	. /bin/common.sh
 	cd /app/frontend || exit 1
-	HOME=/tmp/npmuserhome
+	HOME=$NPMHOME
 	export HOME
 	mkdir -p /app/frontend/dist
 	chown -R "$PUID:$PGID" /app/frontend/dist
 
 	log_info 'Starting frontend ...'
-	s6-setuidgid npmuser yarn install
-	exec s6-setuidgid npmuser yarn watch
+	s6-setuidgid "$PUID:$PGID" yarn install
+	exec s6-setuidgid "$PUID:$PGID" yarn watch
 else
 	exit 0
 fi

docker/rootfs/etc/s6-overlay/s6-rc.d/nginx/run

@@ -6,4 +6,4 @@ set -e
 . /bin/common.sh
 
 log_info 'Starting nginx ...'
-exec s6-setuidgid npmuser nginx
+exec s6-setuidgid "$PUID:$PGID" nginx

docker/rootfs/etc/s6-overlay/s6-rc.d/prepare/00-all.sh

@@ -9,7 +9,11 @@ if [ "$(id -u)" != "0" ]; then
 	log_fatal "This docker container must be run as root, do not specify a user.\nYou can specify PUID and PGID env vars to run processes as that user and group after initialization."
 fi
 
-. /etc/s6-overlay/s6-rc.d/prepare/10-npmuser.sh
+if [ "$DEBUG" = "true" ]; then
+	set -x
+fi
+
+. /etc/s6-overlay/s6-rc.d/prepare/10-usergroup.sh
 . /etc/s6-overlay/s6-rc.d/prepare/20-paths.sh
 . /etc/s6-overlay/s6-rc.d/prepare/30-ownership.sh
 . /etc/s6-overlay/s6-rc.d/prepare/40-dynamic.sh

docker/rootfs/etc/s6-overlay/s6-rc.d/prepare/10-npmuser.sh

@@ -0,0 +1,40 @@
+#!/command/with-contenv bash
+# shellcheck shell=bash
+
+set -e
+
+log_info "Configuring $NPMUSER user ..."
+
+if id -u "$NPMUSER" 2>/dev/null; then
+	# user already exists
+	usermod -u "$PUID" "$NPMUSER"
+else
+	# Add user
+	useradd -o -u "$PUID" -U -d "$NPMHOME" -s /bin/false "$NPMUSER"
+fi
+
+log_info "Configuring $NPMGROUP group ..."
+if [ "$(get_group_id "$NPMGROUP")" = '' ]; then
+	# Add group. This will not set the id properly if it's already taken
+	groupadd -f -g "$PGID" "$NPMGROUP"
+else
+	groupmod -o -g "$PGID" "$NPMGROUP"
+fi
+
+# Set the group ID and check it
+groupmod -o -g "$PGID" "$NPMGROUP"
+if [ "$(get_group_id "$NPMGROUP")" != "$PGID" ]; then
+	echo "ERROR: Unable to set group id properly"
+	exit 1
+fi
+
+# Set the group against the user and check it
+usermod -G "$PGID" "$NPMGROUP"
+if [ "$(id -g "$NPMUSER")" != "$PGID" ] ; then
+	echo "ERROR: Unable to set group against the user properly"
+	exit 1
+fi
+
+# Home for user
+mkdir -p "$NPMHOME"
+chown -R "$PUID:$PGID" "$NPMHOME"

docker/rootfs/etc/s6-overlay/s6-rc.d/prepare/10-usergroup.sh

@@ -2,8 +2,6 @@
 # shellcheck shell=bash
 
 set -e
-# verbose
-set -x
 
 log_info 'Checking paths ...'
 

docker/rootfs/etc/s6-overlay/s6-rc.d/prepare/20-paths.sh

@@ -2,15 +2,13 @@
 # shellcheck shell=bash
 
 set -e
-# verbose
-set -x
 
 log_info 'Setting ownership ...'
 
 # root
 chown root /tmp/nginx
 
-# npmuser
+# npm user and group
 chown -R "$PUID:$PGID" /data
 chown -R "$PUID:$PGID" /etc/letsencrypt
 chown -R "$PUID:$PGID" /run/nginx