Script to monitor GLPI Agent version
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#!/bin/sh
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# Purpose {{{
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## Create a temp file (to monitor) if an upgrade is available for GLPI Agent
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## project on Github − https://github.com/glpi-project/glpi-agent/releases
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## It's based on .deb package installation to check the current version.
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## It can also compare the current available version in APT repositories
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## if "--repo" option is given.
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## How-to use {{{
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### 1. Needs releasetags script, in the same directory
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### cf. https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/github/releasetags
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# wget https://git.ipr.univ-rennes1.fr/cellinfo/scripts/raw/master/github/releasetags
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### 2. Create a cron job, eg :
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#00 20 * * * root /opt/repos/ipr.scripts/github/check.glpi-agent.update
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### 2-1 Create a cron job to compare the version available in a Debian repository :
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#00 20 * * * root /opt/repos/ipr.scripts/github/check.glpi-agent.update --repo
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### 3. Monitor the temp file : /tmp/.github.glpi-agent.upgrade
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# Or enable MAILTO in cronjob and edit the script to print a message.
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# Or send a mail.
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# …
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## }}}
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# }}}
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# Vars {{{
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PROGNAME=$(basename "${0}"); readonly PROGNAME
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PROGDIR=$(readlink -m $(dirname "${0}")); readonly PROGDIR
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ARGS="${*}"; readonly ARGS
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readonly NBARGS="${#}"
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[ -z "${DEBUG}" ] && DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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## Default values for some vars
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### Don't use APT repository by default
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readonly REPOSITORY_MODE_DEFAULT=1
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readonly GLPI_AGENT_REPO_URL="https://github.com/glpi-project/glpi-agent"
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readonly GLPI_AGENT_NEW_VERSION_FILE="/tmp/.github.glpi-agent.upgrade"
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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usage() { # {{{
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cat <<- HELP
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usage: $PROGNAME [-d|-h|-r]
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Compare GLPI Agent installed version and latest one.
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EXAMPLES :
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- Compare the current version installed from .deb file
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${PROGNAME}
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- Compare the current version from apt's repository
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${PROGNAME} --repo
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OPTIONS :
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-d,--debug
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Enable debug messages.
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-h,--help
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Print this help message.
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-r,--repo,--repository
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Use GLPI Agent version from APT repository.
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HELP
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}
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# }}}
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debug_message() { # {{{
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local_debug_message="${1}"
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## Print message if DEBUG is enable (=0)
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[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG − ${PROGNAME} : ${local_debug_message}"
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unset local_debug_message
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return 0
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}
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# }}}
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error_message() { # {{{
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local_error_message="${1}"
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local_error_code="${2}"
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## Print message
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printf '%b\n' "ERROR − ${PROGNAME} : ${RED}${local_error_message}${RESET}"
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unset local_error_message
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exit "${local_error_code:=66}"
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}
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# }}}
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define_vars() { # {{{
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## If repository_mode wasn't defined (argument) {{{
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if [ -z "${repository_mode}" ]; then
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## Use default value
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readonly repository_mode="${REPOSITORY_MODE_DEFAULT}"
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fi
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# }}}
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}
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# }}}
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is_var_empty() { # {{{
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## Return False by default
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return_var_empty="1"
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## Total number of variables to test
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local_total_var="${#}"
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loop_count_var_empty="0"
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## While it remains a variable to test
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while [ "${local_total_var}" -gt "${loop_count_var_empty}" ]; do
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debug_message "is_var_empty − \
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Test var: ${1}."
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### Test if this is empty and set return value to True
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[ -z "${1}" ] && return_var_empty="0"
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### Increase the number of tested variables
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loop_count_var_empty=$((loop_count_var_empty+1))
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### Shift to the next variable
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shift
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done
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unset local_total_var
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unset loop_count_var_empty
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return "${return_var_empty}"
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}
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# }}}
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main() { # {{{
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## Define all vars
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define_vars
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## Get current version from APT repository or from .deb package {{{
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if [ "${repository_mode}" -eq "0" ]; then
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debug_message "--- MAIN Check current version from ${RED}APT repositories${COLOR_DEBUG}."
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glpi_agent_current_version=$(apt-cache policy glpi-agent \
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| awk '/Candidate:/ {print $2}' \
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| sed 's/.:\(.*\)-.*/\1/')
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else
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debug_message "--- MAIN Check current version from ${RED}manually installed .deb package${COLOR_DEBUG}."
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glpi_agent_current_version=$(dpkg -l glpi-agent \
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| awk '/^ii.*glpi-agent/ {print $3}' \
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| sed 's/.:\(.*\)-.*/\1/')
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fi
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## }}}
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## Get latest version from project repository {{{
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### OR Exit with error message
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debug_message "--- MAIN Check latest version from project repository (${RED}${GLPI_AGENT_REPO_URL}${COLOR_DEBUG})."
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glpi_agent_latest_version=$("${PROGDIR}/releasetags" "${GLPI_AGENT_REPO_URL}" | head --lines=1 \
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|| error_message "Can't get latest GLPI Agent version from repository (${GLPI_AGENT_REPO_URL})." 02 )
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## }}}
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## If any of the two variables is empty {{{
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### OR Exit with error message
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is_var_empty "${glpi_agent_current_version}" "${glpi_agent_latest_version}" \
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&& error_message "At least one variable is empty (current version : ${glpi_agent_current_version}, latest version : ${glpi_agent_latest_version}) !" 04
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## }}}
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# Check if the current version is the last one {{{
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## If the two versions are the same {{{
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if [ "${glpi_agent_current_version}" = "${glpi_agent_latest_version}" ]; then
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debug_message "Test version − \
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The current GLPI Agent version (${RED}${glpi_agent_current_version}${COLOR_DEBUG}) is up-to-date."
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### Ensure to remove any temp file
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rm --force -- "${GLPI_AGENT_NEW_VERSION_FILE}"
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exit 0
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## }}}
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## If the versions are different {{{
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else
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debug_message "Test version − \
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Current version (${RED}${glpi_agent_current_version}${COLOR_DEBUG}) and latest one (${RED}${glpi_agent_latest_version}${COLOR_DEBUG}) seems to be different."
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## Create a temp file to monitor
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touch -- "${GLPI_AGENT_NEW_VERSION_FILE}"
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debug_message "An upgrade is available for Cachet (current : ${glpi_agent_current_version}) : ${glpi_agent_latest_version}." >> "${GLPI_AGENT_NEW_VERSION_FILE}"
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exit 0
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fi
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## }}}
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# }}}
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}
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# }}}
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# Manage arguments # {{{
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# This code can't be in a function due to argument management
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if [ ! "${NBARGS}" -eq "0" ]; then
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manage_arg="0"
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## If the first argument is not an option
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if ! printf -- '%s' "${1}" | grep -q -E -- "^-+";
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then
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## Print help message and exit
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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fi
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# Parse all options (start with a "-") one by one
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while printf -- '%s' "${1}" | grep -q -E -- "^-+"; do
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case "${1}" in
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--debug ) ## debug
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DEBUG=0
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debug_message "--- Manage argument BEGIN"
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;;
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-h|--help ) ## help
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usage
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## Exit after help informations
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exit 0
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;;
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-r|--repo|--repository ) ## Set repository_mode
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repository_mode=0
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;;
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* ) ## unknow option
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printf '%b\n' "${RED}Invalid option: ${1}${RESET}"
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printf '%b\n' "---"
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usage
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exit 1
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;;
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esac
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debug_message "| ${RED}${1}${COLOR_DEBUG} option managed."
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## Move to the next argument
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shift
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manage_arg=$((manage_arg+1))
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done
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debug_message "| ${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
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else
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debug_message "| No arguments/options to manage."
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fi
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debug_message "--- Manage argument END"
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# }}}
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main
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exit 255
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