Prepare script to apply APT upgrades
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#!/bin/sh
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# This script will try to apply APT upgrades if all conditions are satisfied
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# 1. SGE queue is disable
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# 2. No SGE jobs are running
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# 3. No process related to Maco are running
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# This script can be call by a cronjob (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 "${DEBUG}" ] && readonly DEBUG=0
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## Export DEBUG for sub-script
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export DEBUG
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${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: $PROGNAME
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Apply any APT package upgrade if the host is free :
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* SGE queue is disable
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* No SGE jobs are running
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EXAMPLES :
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- Apply upgrade on the current host
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${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 $1-1}')"
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case "${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_queue_enable() { # {{{
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local_sge_hostname="${1}"
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local_sge_queue_name="${2}"
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## List all queues with 'disable' state and filter to the expected queue name
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## with a fake_user to avoid pending jobs for this queue
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### And count returned lines
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local_sge_queue_test=$(qstat -f -qs d -q "${local_sge_queue_name:=/dev/null}@${local_sge_hostname:=/dev/null}" -u fake_user \
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| wc -l)
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case "${local_sge_queue_test}" in
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0 ) ## No result so the queue is enable
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local_sge_queue_state="enable"
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return_queue_enable="0"
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;;
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3 ) ## Results (header + queue name) so the queue is disable
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local_sge_queue_state="disable"
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return_queue_enable="1"
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;;
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* ) ## Unexpected result
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printf '%b\n' "${RED}Not able to determine the state of ${local_sge_queue_name:=/dev/null}@${local_sge_hostname:=/dev/null} queue (command return ${local_sge_queue_test} lines).${RESET}"
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exit 2
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;;
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esac
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## Simple debug message to valid current variables
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debug_message "is_queue_enable − \
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SGE queue: ${RED}${local_sge_queue_name:=/dev/null}${COLOR_DEBUG} \
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state is: ${RED}${local_sge_queue_state:=/dev/null}${COLOR_DEBUG}."
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return "${return_queue_enable}"
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}
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# }}}
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is_job_running() { # {{{
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local_sge_hostname="${1}"
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## List SGE informations about the host
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### And get the number of used slots
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local_sge_slots_used=$(qhost -h "${local_sge_hostname:=/dev/null}" -q -xml \
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| grep slots_used \
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| sed 's;.*<queuevalue.*>\(.*\)</queuevalue>;\1;')
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case "${local_sge_slots_used}" in
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0 ) ## No jobs are running
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return_job_running="1"
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;;
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* ) ## Results (header + queue name) so the queue is disable
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return_job_running="0"
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;;
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esac
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## Simple debug message to valid current variables
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debug_message "is_job_running − \
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jobs running on ${local_sge_hostname} host : ${RED}${local_sge_slots_used}${COLOR_DEBUG}."
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return "${return_job_running}"
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}
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# }}}
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is_proc_running() { # {{{
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local_proc_pattern="${1}"
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local_count_proc_pattern="$(pgrep -f -- "${local_proc_pattern}" | wc -l)"
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case "${local_count_proc_pattern}" in
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0 ) ## No procs related to this pattern are running
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return_proc_running="1"
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;;
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* ) ## At least one proc seems running
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return_proc_running="0"
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;;
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esac
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## Simple debug message to valid current variables
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debug_message "is_proc_running − \
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${local_count_proc_pattern} procs seems running according to the pattern: ${RED}${local_proc_pattern}${COLOR_DEBUG}."
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return "${return_proc_running}"
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}
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# }}}
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main() { # {{{
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manage_args "${ARGS}"
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sge_hostname="$(hostname -f)"
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sge_queue_name="$(qhost -h "${sge_hostname:=/dev/null}" -q -xml \
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| grep "queue name" \
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| cut -d"'" -f2 )"
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maco_proc_pattern="(/opt/maco/bin/maco.autoupdate.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 SGE queue is enable
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### Exit
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is_queue_enable "${sge_hostname}" "${sge_queue_name}" \
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&& exit 0
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## If any SGE job runs
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### Exit
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is_job_running "${sge_hostname}" \
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&& exit 0
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## If anything to maco is currently running
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### Exit
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is_proc_running "${maco_proc_pattern}" \
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&& exit 0
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}
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# }}}
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main
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exit 0
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