#!/bin/sh
# Purpose {{{
## Create a temp file (to monitor) if an upgrade is available for cState
## project on Github.
## It's based on the cState URL site to get the current version.
## How-to use {{{
### 1. Needs releasetags script, in the same directory
### cf. https://git.101010.fr/gardouille-dotfiles/scripts/src/branch/master/github/releasetags
# wget https://git.101010.fr/gardouille-dotfiles/scripts/raw/branch/master/github/releasetags
### 2. Create a cron job with cState URL as first argument, eg.
#00 20 * * * root /opt/repos/gardouille.scripts/github/check_cstate_update https://vmstatus.domain.tld
### 3. Monitor the temp file : /tmp/.github.cstate.upgrade
# Or enable MAILTO in cronjob and edit the script to print a message.
# Or send a mail.
# …
## }}}
# }}}

# Expect 1 argument {{{
if [ $# -ne 1 ]
then
	cat << HELP

check.cstate.update  --
Compare current version of an installed cState site and the last available.

EXAMPLE :
    - Compare the current version installed on https://vmstatus.domain.tld
        check.cstate.update https://vmstatus.domain.tld

HELP

	exit 1
fi

# }}}

# Vars {{{
DEBUG=1

script_wd=$(dirname "${0}")

cstate_url="${1}"
cstate_current_version=$(curl --insecure --silent "${cstate_url}" | grep -E 'meta.*generator.*cState.*github.com' | sed 's;.*generator.*content.*cState \(v.*\) - https.*github.com.*;\1;')

cstate_repo_url="https://github.com/cstate/cstate"
cstate_new_version=$("${script_wd}"/releasetags "${cstate_repo_url}" | grep -vE -- '(dev|rc)' | head -n1)

cstate_new_version_file="/tmp/.github.cstate.upgrade"
# }}}

# Check if the current version is the last one {{{
if [ "${cstate_current_version}" != "${cstate_new_version}" ]; then
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — Current version (${cstate_current_version}) and new one (${cstate_new_version}) seems to be different."

	## Create a temp file to monitor
	touch -- "${cstate_new_version_file}"
	printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for cState (current : ${cstate_current_version}) : ${cstate_new_version}." >> "${cstate_new_version_file}"

else
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — The current version is up-to-date."
	rm -f -- "${cstate_new_version_file}"
fi
# }}}

exit 0