276 lines
6.5 KiB
Bash
Executable File
276 lines
6.5 KiB
Bash
Executable File
#!/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. Create a temp file
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# 2. 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 "${DEBUG}" ] && DEBUG=1
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## Export DEBUG for sub-script
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export DEBUG
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readonly APT_TMP_FILE="/tmp/.apt.upgrade"
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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usage() { # {{{
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cat <<- EOF
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usage: $PROGNAME [-d|-e|-h|-t]
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Verify if any APT package upgrade is available and
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try to prepare the host by :
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* Disabling SGE queue
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EXAMPLES :
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- Verify upgrade and prepare the current host
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${PROGNAME}
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OPTIONS :
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-d,--debug
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Enable debug messages.
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-e,--empty
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Check APT upgrades only if SGE slots are empty
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-h,--help
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Print this help message.
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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} : ${local_message}"
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return 0
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}
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# }}}
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define_vars() { # {{{
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## If sge_hostname wasn't defined (environment variable,…)
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if [ -z "${sge_hostname}" ]; then
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## Use local host for sge_hostname
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sge_hostname="$(hostname -f)"
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fi
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## If EMPTY_ONLY_MODE wasn't defined (argument, environment variable,…)
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if [ -z "${EMPTY_ONLY_MODE}" ]; then
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### Set False by default
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EMPTY_ONLY_MODE="1"
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fi
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## Script used to disable SGE queue(s)
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sge_disable_host_queue_script="${PROGDIR}/sge.disable.host.queue.sh"
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## Get the number of SGE used slots
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sge_slots_used=$(qhost -h "${sge_hostname:=/dev/null}" -q -xml \
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| grep --max-count=1 -- "'slots_used'" \
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| sed 's;.*<queuevalue.*>\(.*\)</queuevalue>;\1;')
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}
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# }}}
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is_sge_host() { # {{{
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## Check if SGE commands (qhost) are available
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if [ "$(command -v qhost)" ]; then
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return_is_sge_host="0"
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debug_message "is_sge_host − \
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SGE seems present on this host."
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else
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return_is_sge_host="1"
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debug_message "is_sge_host − \
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SGE is not present on this host."
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fi
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return "${return_is_sge_host}"
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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 2>/dev/null \
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| wc -l \
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| awk '{print $1-1}')"
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case "${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 2>/dev/null \
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| wc -l \
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| awk '{print $1-1}')"
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case "${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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is_sge_slots_empty() { # {{{
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if [ "${sge_slots_used}" -eq "0" ]; then
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## Used slots is null
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return_sge_slots_empty="0"
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else
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return_sge_slots_empty="1"
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fi
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## Simple debug message to valid current variable
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debug_message "is_sge_slots_empty − \
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SGE slots currently in use: ${RED}${sge_slots_used:=/dev/null}${COLOR_DEBUG}."
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return "${return_sge_slots_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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## If SGE is not yet available on this host {{{
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### Exit
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is_sge_host \
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|| exit 0
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## }}}
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## If NO APT package upgrade is available {{{
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### Ensure to remove any temp file related to APT upgrades
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### AND Exit
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is_apt_upgrade_absent \
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&& rm -f -- "${APT_TMP_FILE}" \
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&& exit 0
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## }}}
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## If EMPTY_ONLY_MODE is set {{{
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### Verify empty slots
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### OR Exit
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if [ "${EMPTY_ONLY_MODE}" -eq "0" ]; then
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### If SGE slots are not empty
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### Exit
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is_sge_slots_empty \
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|| exit 0
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fi
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## }}}
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## If APT package upgrade is available {{{
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### Create a temp file
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### Disable SGE queue
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### AND Exit
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is_apt_upgrade_present \
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&& touch "${APT_TMP_FILE}" && echo "APT upgrade is available." >> "${APT_TMP_FILE}" \
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&& sh "${sge_disable_host_queue_script}" \
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&& exit 0
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## }}}
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}
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# }}}
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# Manage arguments # {{{
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# This code can't be in a function due to argument management
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if [ ! "${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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-d|--debug ) ## debug
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DEBUG=0
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;;
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-e|--empty ) ## Empty only mode
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EMPTY_ONLY_MODE="0"
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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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* ) ## 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 "Arguments management − \
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${RED}${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 "Arguments management − \
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${RED}${manage_arg}${COLOR_DEBUG} argument(s) successfully managed."
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else
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debug_message "Arguments management − \
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No arguments/options to manage."
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fi
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# }}}
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main
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exit 255
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