entrypoint.sh

#!/usr/bin/env bash
set -e

[ "${COMMAND_NOT_FOUND_AUTOINSTALL}" = 'n' ] && unset COMMAND_NOT_FOUND_AUTOINSTALL || export COMMAND_NOT_FOUND_AUTOINSTALL=y

umask 0022

DEFAULT_BUILD_USER='builduser'

setToDefaults() {
	BUILD_USER="$DEFAULT_BUILD_USER" && BUILD_USER_HOME='/workspace'
}


autoInstallPrerequisites() {
	TOOL=tools/prerequisites

	[ -x "$TOOL" ] || return
	grep -qE 'Usage:.*(check.*install|install.*check)' "$TOOL" || return

	"$TOOL" check || "$TOOL" install -y
}



# for backwards compatibility
if [ -z "$BUILD_USER" ] && [ -z "$BUILD_USER_HOME" ] && [ -z "$BUILD_USER_UID" ]; then
	setToDefaults
	[ -z "$USE_UID_FROM" ] && USE_UID_FROM="$BUILD_USER_HOME"
	[ "$PWD" == "/" ] && cd "$BUILD_USER_HOME"
fi

# ignore PARAMS BUILD_USER and BUILD_USER_HOME (use defaults) if not root
[ `id -u` -eq 0 ] || setToDefaults

[ -z "$BUILD_USER" ] && BUILD_USER="$DEFAULT_BUILD_USER"
[ -n "$USE_UID_FROM" ] && BUILD_USER_UID=`stat -c "%u" $USE_UID_FROM`

if [ `id -u` -eq 0 ]; then
	# better read HOME/DHOME from /etc/default/useradd /etc/adduser.conf
	[ -z "$BUILD_USER_HOME" ] && BUILD_USER_HOME=/home/$BUILD_USER

	USERADD="useradd -G sudo -s /bin/bash -d $BUILD_USER_HOME"
	[ -d "$BUILD_USER_HOME" ] && USERADD="$USERADD -M" || USERADD="$USERADD -m"
	if [ -n "$BUILD_USER_UID" ]; then
		USERADD="$USERADD -u $BUILD_USER_UID"
		# delete a user if there is already a user with that UID
		TMP_DEL_USER=`getent passwd $BUILD_USER_UID | cut -d':' -f1` && [ -n "$TMP_DEL_USER" ] && [ "$DEFAULT_BUILD_USER" != "$TMP_DEL_USER" ] && userdel $TMP_DEL_USER >/dev/null 2>/dev/null
	fi

	[ -n "$BUILD_USER_GID" ] && USERADD="$USERADD -g $BUILD_USER_GID" && (getent group "$BUILD_USER_GID" || groupadd "$BUILD_USER_GID" "$BUILD_USER")

	USERADD="$USERADD $BUILD_USER"
	# remove the default builduser created in Dockerfile that exists in image
	userdel "$DEFAULT_BUILD_USER"
	eval "$USERADD"
fi

# if there are missing prerequisites we try to install them via tools/prerequisites
if [ "${AUTOINSTALL_PREREQUISITES}" != 'n' ]; then
	export -f autoInstallPrerequisites
	if [ `id -u` -eq 0 ]; then
		su "$BUILD_USER" -c autoInstallPrerequisites || true
	else
		autoInstallPrerequisites || true
	fi
	unset autoInstallPrerequisites
fi

DEFAULT_SHELL=`getent passwd $BUILD_USER | cut -f 7 -d':'`
if [ `id -u` -eq 0 ]; then
	[ "$#" -gt 0 ] && exec gosu "$BUILD_USER" "$@" || exec gosu "$BUILD_USER" "$DEFAULT_SHELL"
else
	[ "$#" -gt 0 ] && exec "$@" || exec "$DEFAULT_SHELL"
fi