Script to check if APT upgrade is available
And prepare the host (by disabling SGE queue) in order to apply upgrades asap.
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#!/bin/sh
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# This script will check if any APT upgrade is available and
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# will prepare the host in order to apply upgrade with another script
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# 1. Disable SGE queue
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# This script can be call by a cronjob (eg. weekly)
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# Another script should try to apply upgrades also with cron (eg. hourly)
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# Vars {{{
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readonly PROGNAME=$(basename "${0}")
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readonly PROGDIR=$(readlink -m $(dirname "${0}"))
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readonly ARGS="${*}"
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readonly NBARGS="${#}"
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[ -z "${DEBUG}" ] && readonly DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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manage_args() { # {{{
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case "${NBARGS}" in
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0 ) ## Nothing to do
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;;
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* )
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printf '%b\n' "${RED}Don't expect any arguments.${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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}
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# }}}
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usage() { # {{{
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cat <<- EOF
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usage: $PROGNAME
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Verify if any APT package upgrade is available and
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try to prepare the host by :
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* Disabling SGE queue
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EXAMPLES :
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- Verify upgrade and prepare the current host
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${PROGNAME}
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EOF
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}
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# }}}
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debug_message() { # {{{
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local_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} : ${local_message}"
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}
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# }}}
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is_apt_upgrade_absent() { # {{{
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## Count the number of upgradable packages and substract 1 for the header
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#local_apt_upgrade_number="$(apt list --upgradable \
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#| wc -l \
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#| awk '{print $1-1}')"
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local_apt_upgrade_number="5"
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case "${local_apt_upgrade_number}" in
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0 ) ## No available upgrade
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return_apt_upgrade_absent="0"
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;;
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* ) ## Upgrade seems available
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return_apt_upgrade_absent="1"
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;;
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esac
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## Simple debug message to valid current variable
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debug_message "is_apt_upgrade_absent − \
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APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/null}${COLOR_DEBUG}."
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return "${return_apt_upgrade_absent}"
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}
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# }}}
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is_apt_upgrade_present() { # {{{
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## Count the number of upgradable packages and substract 1 for the header
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#local_apt_upgrade_number="$(apt list --upgradable \
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#| wc -l \
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#| awk '{print $1-1}')"
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local_apt_upgrade_number="5"
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case "${local_apt_upgrade_number}" in
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0 ) ## No available upgrade
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return_apt_upgrade_present="1"
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;;
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* ) ## Upgrade seems available
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return_apt_upgrade_present="0"
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;;
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esac
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## Simple debug message to valid current variable
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debug_message "is_apt_upgrade_present − \
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APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/null}${COLOR_DEBUG}."
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return "${return_apt_upgrade_present}"
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}
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# }}}
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main() { # {{{
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manage_args "${ARGS}"
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disable_host_queue_script="${PROGDIR}/disable.host.queue.sh"
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## If NO APT package upgrade is available
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### Exit
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is_apt_upgrade_absent \
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&& exit 0
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## If APT package upgrade is available
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### Disable SGE queue
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is_apt_upgrade_present \
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&& sh "${disable_host_queue_script}"
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}
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# }}}
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main
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exit 0
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