vpnclient_ynh/scripts/_common.sh

#!/bin/bash
#
# Common variables
#

pkg_dependencies="php5-fpm sipcalc dnsutils openvpn curl fake-hwclock"


# Experimental helpers
# Cf. https://github.com/YunoHost-Apps/Experimental_helpers/blob/72b0bc77c68d4a4a2bf4e95663dbc05e4a762a0a/ynh_read_manifest/ynh_read_manifest
read_json () {
    sudo python3 -c "import sys, json;print(json.load(open('$1'))['$2'])"
}
read_manifest () {
    if [ -f '../manifest.json' ] ; then
        read_json '../manifest.json' "$1"
    else
        read_json '../settings/manifest.json' "$1"
    fi
}


# Helper to start/stop/.. a systemd service from a yunohost context,
# *and* the systemd service itself needs to be able to run yunohost
# commands.
#
# Hence the need to release the lock during the operation
#
# usage : ynh_systemctl yolo restart
#
function ynh_systemctl()
{
  local ACTION="$1"
  local SERVICE="$2"
  local LOCKFILE="/var/run/moulinette_yunohost.lock"

  # Launch the action
  sudo systemctl "$ACTION" "$SERVICE" &
  local SYSCTLACTION=$!

  # Save and release the lock...
  cp $LOCKFILE $LOCKFILE.bkp.$$
  rm $LOCKFILE

  # Wait for the end of the action
  wait $SYSCTLACTION

  # Make sure the lock is released...
  while [ -f $LOCKFILE ]
  do
    sleep 0.1
  done

  # Restore the old lock
  mv $LOCKFILE.bkp.$$ $LOCKFILE
}

# Read the value of a key in a ynh manifest file
#
# usage: ynh_read_manifest manifest key
# | arg: manifest - Path of the manifest to read
# | arg: key - Name of the key to find
ynh_read_manifest () {
	manifest="$1"
	key="$2"
	python3 -c "import sys, json;print(json.load(open('$manifest', encoding='utf-8'))['$key'])"
}

# Read the upstream version from the manifest
# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
# For example : 4.3-2~ynh3
# This include the number before ~ynh
# In the last example it return 4.3-2
#
# usage: ynh_app_upstream_version
ynh_app_upstream_version () {
    manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
    fi
    version_key=$(ynh_read_manifest "$manifest_path" "version")
    echo "${version_key/~ynh*/}"
}

# Read package version from the manifest
# The version number in the manifest is defined by <upstreamversion>~ynh<packageversion>
# For example : 4.3-2~ynh3
# This include the number after ~ynh
# In the last example it return 3
#
# usage: ynh_app_package_version
ynh_app_package_version () {
    manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
        manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
    fi
    version_key=$(ynh_read_manifest "$manifest_path" "version")
    echo "${version_key/*~ynh/}"
}

# Exit without error if the package is up to date
#
# This helper should be used to avoid an upgrade of a package
# when it's not needed.
#
# To force an upgrade, even if the package is up to date,
# you have to set the variable YNH_FORCE_UPGRADE before.
# example: sudo YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp
#
# usage: ynh_abort_if_up_to_date
ynh_abort_if_up_to_date () {
	local force_upgrade=${YNH_FORCE_UPGRADE:-0}
	local package_check=${PACKAGE_CHECK_EXEC:-0}

	local version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
	local last_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
	if [ "$version" = "$last_version" ]
	then
		if [ "$force_upgrade" != "0" ]
		then
			echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
			unset YNH_FORCE_UPGRADE
		elif [ "$package_check" != "0" ]
		then
			echo "Upgrade forced for package check." >&2
		else
			ynh_die "Up-to-date, nothing to do" 0
		fi
	fi
}