scripts/cluster/apt.check.update.sh

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#!/bin/sh
# This script will check if any APT upgrade is available and
# will prepare the host in order to apply upgrade with another script
# 1. Disable SGE queue
# This script can be call by a cronjob (eg. weekly)
# Another script should try to apply upgrades also with cron (eg. hourly)
# Vars {{{
readonly PROGNAME=$(basename "${0}")
readonly PROGDIR=$(readlink -m $(dirname "${0}"))
readonly ARGS="${*}"
readonly NBARGS="${#}"
[ -z "${DEBUG}" ] && readonly DEBUG=1
## Export DEBUG for sub-script
export DEBUG
## Colors
readonly PURPLE='\033[1;35m'
readonly RED='\033[0;31m'
readonly RESET='\033[0m'
readonly COLOR_DEBUG="${PURPLE}"
# }}}
manage_args() { # {{{
case "${NBARGS}" in
0 ) ## Nothing to do
;;
* )
printf '%b\n' "${RED}Don't expect any arguments.${RESET}"
printf '%b\n' "---"
usage
exit 1
;;
esac
}
# }}}
usage() { # {{{
cat <<- EOF
usage: $PROGNAME
Verify if any APT package upgrade is available and
try to prepare the host by:
* Disabling SGE queue
EXAMPLES:
- Verify upgrade and prepare the current host
${PROGNAME}
EOF
}
# }}}
debug_message() { # {{{
local_message="${1}"
## Print message if DEBUG is enable (=0)
[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6b\e[m\n' "DEBUG ${PROGNAME}: ${local_message}"
}
# }}}
is_apt_upgrade_absent() { # {{{
## Count the number of upgradable packages and substract 1 for the header
local_apt_upgrade_number="$(apt list --upgradable \
| wc -l \
| awk '{print $1-1}')"
case "${local_apt_upgrade_number}" in
0 ) ## No available upgrade
return_apt_upgrade_absent="0"
;;
* ) ## Upgrade seems available
return_apt_upgrade_absent="1"
;;
esac
## Simple debug message to valid current variable
debug_message "is_apt_upgrade_absent \
APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/null}${COLOR_DEBUG}."
return "${return_apt_upgrade_absent}"
}
# }}}
is_apt_upgrade_present() { # {{{
## Count the number of upgradable packages and substract 1 for the header
local_apt_upgrade_number="$(apt list --upgradable \
| wc -l \
| awk '{print $1-1}')"
case "${local_apt_upgrade_number}" in
0 ) ## No available upgrade
return_apt_upgrade_present="1"
;;
* ) ## Upgrade seems available
return_apt_upgrade_present="0"
;;
esac
## Simple debug message to valid current variable
debug_message "is_apt_upgrade_present \
APT upgrade available for this system: ${RED}${local_apt_upgrade_number:=/dev/null}${COLOR_DEBUG}."
return "${return_apt_upgrade_present}"
}
# }}}
main() { # {{{
manage_args "${ARGS}"
disable_host_queue_script="${PROGDIR}/disable.host.queue.sh"
## If NO APT package upgrade is available
### Exit
is_apt_upgrade_absent \
&& exit 0
## If APT package upgrade is available
### Disable SGE queue
is_apt_upgrade_present \
&& sh "${disable_host_queue_script}"
}
# }}}
main
exit 0