#!/bin/sh
# Purpose {{{
## Create a temp file (to monitor) if an upgrade is available for Sharelatex
## image on the Docker Hub.
## How-to use {{{
### 1. Needs imagetags script, in the same directory
### cf. https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/docker/imagetags
# wget https://git.ipr.univ-rennes1.fr/cellinfo/scripts/raw/master/docker/imagetags
### 2. Ensure to run with a user member of the docker group.
### 3. Create a cron job, eg.
#00 20 * * * root /opt/repos/ipr.scripts/docker/check.sharelatex.update
### 4. Monitor the temp file.
# Or enable MAILTO in cronjob and print a message in the script.
# Or send a mail.
# …
## }}}
# }}}

# Vars {{{
DEBUG=1

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

sharelatex_repo_name="sharelatex"
sharelatex_image_name="sharelatex"

#sharelatex_current_version=$(docker container ls | grep -- "${sharelatex_repo_name}/${sharelatex_image_name}" | sed -- "s/.*${sharelatex_repo_name}\/${sharelatex_image_name}:\([^ ]*\) .*/\1/")
sharelatex_current_version="v1.2.1"

sharelatex_grep_pattern="v[[:digit:]]\\.\\+[[:digit:]]*\\.\\?[[:digit:]]*$"
sharelatex_new_version=$("${script_wd}"/imagetags "${sharelatex_repo_name}/${sharelatex_image_name}" "${sharelatex_grep_pattern}" | tail -n1)

sharelatex_new_version_file="/tmp/.docker.sharelatex.upgrade"
# }}}

# Check if a container already runs with the wanted image {{{
#if [ ! $(docker container ls | grep -q -- "${sharelatex_repo_name}${sharelatex_image_name}") ]; then
	#[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test ${sharelatex_image_name} — Current version is ${sharelatex_current_version}."
#else
	#[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test ${sharelatex_image_name} — No container runs with ${sharelatex_image_name} image on this host."
	#rm -f -- "${sharelatex_new_version_file}"
	#exit 1
#fi

## I am currently using a homemade version of Sharelatex in order to :
##	* use the last version of LaTeX/tlmgr env (2018)
##	* add severals packages used for Physics papers
## For more informations, see :
## https://github.com/ipr-cnrs/sharelatex-docker-image

# }}}

# Check if the current version is the last one {{{
if [ "${sharelatex_current_version}" != "${sharelatex_new_version}" ]; then
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — An upgrade is available for ${sharelatex_image_name}: ${sharelatex_new_version}."
	# Create a temp file to monitor
	touch -- "${sharelatex_new_version_file}"
	printf '\e[1;35m%-6s\e[m\n' "An upgrade is available for ${sharelatex_image_name}: ${sharelatex_new_version}." >> "${sharelatex_new_version_file}"
else
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test version — The current version is up-to-date."
	rm -f -- "${sharelatex_new_version_file}"
fi
# }}}

exit 0