cryptpad_ynh/scripts/_common.sh

#!/bin/bash

#=================================================
# COMMON VARIABLES
#=================================================
nodejs_version=6

#=================================================

# Start or restart a service and follow its booting
#
# usage: ynh_check_starting "Line to match" [Log file] [Timeout] [Service name]
#
# | arg: Line to match - The line to find in the log to attest the service have finished to boot.
# | arg: Log file - The log file to watch
# | arg: Service name
# /var/log/$app/$app.log will be used if no other log is defined.
# | arg: Timeout - The maximum time to wait before ending the watching. Defaut 300 seconds.
ynh_check_starting () {
	local line_to_match="$1"
	local service_name="${4:-$app}"
	local app_log="${2:-/var/log/$service_name/$service_name.log}"
	local timeout=${3:-300}

	ynh_clean_check_starting () {
		# Stop the execution of tail.
		kill -s 15 $pid_tail 2>&1
		ynh_secure_remove "$templog" 2>&1
	}

	echo "Starting of $service_name" >&2
	systemctl stop $service_name
	local templog="$(mktemp)"
	# Following the starting of the app in its log
	tail -F -n0 "$app_log" > "$templog" &
	# Get the PID of the tail command
	local pid_tail=$!
	systemctl start $service_name

	local i=0
	for i in `seq 1 $timeout`
	do
		# Read the log until the sentence is found, that means the app finished to start. Or run until the timeout
		if grep --quiet "$line_to_match" "$templog"
		then
			echo "The service $service_name has correctly started." >&2
			break
		fi
		echo -n "." >&2
		sleep 1
	done
	if [ $i -eq $timeout ]
	then
		echo "The service $service_name didn't fully started before the timeout." >&2
	fi

	echo ""
	ynh_clean_check_starting
}

#=================================================


# EXEC_LOGIN_AS Helper

# Execute a command as another user with login
# (hence in user home dir, with prior loading of .profile, etc.)
# usage: exec_login_as USER COMMAND [ARG ...]
exec_login_as() {
  local user=$1
  shift 1
  exec_as $user --login "$@"
}
# Execute a command as another user
# usage: exec_as USER COMMAND [ARG ...]
exec_as() {
  local user=$1
  shift 1

  if [[ $user = $(whoami) ]]; then
    eval "$@"
  else
    sudo -u "$user" "$@"
  fi
}