Prepare a script to apply Maco upgrade
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#!/bin/sh
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# This script will try to apply Maco upgrade 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 already 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 "${DEBUG}" ] && readonly DEBUG=0
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## Export DEBUG for sub-script
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export DEBUG
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# Maco temp file
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readonly MACO_TMP_FILE="/tmp/.maco.upgrade"
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readonly MACO_TMP_URGENT_FILE="/tmp/.maco.urgent.upgrade"
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# APT temp file to monitor
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readonly APT_TMP_FILE="/tmp/.apt.upgrade"
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## Colors
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readonly PURPLE='\033[1;35m'
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readonly RED='\033[0;31m'
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readonly RESET='\033[0m'
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readonly COLOR_DEBUG="${PURPLE}"
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# }}}
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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: $PROGNAME
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Apply any Maco upgrade if the host is free:
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* SGE queue is disable
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* No SGE jobs are running
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EXAMPLES:
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- Apply Maco upgrade on the current host
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${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}: ${local_message}"
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}
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# }}}
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is_apt_upgrade_present() { # {{{
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## Check if temp APT upgrade file exists
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if [ -f "${APT_TMP_FILE}" ]; then
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return_apt_upgrade_present="0"
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debug_message "is_apt_upgrade_absent − \
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APT upgrade seems available for this system."
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else
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return_apt_upgrade_present="1"
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debug_message "is_apt_upgrade_absent − \
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NO APT upgrade available for this system."
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fi
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return "${return_apt_upgrade_present}"
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}
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# }}}
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is_maco_upgrade_absent() { # {{{
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return_maco_upgrade_absent="0"
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## Check if temp Maco upgrade file is present
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if [ -f "${MACO_TMP_FILE}" ]; then
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return_maco_upgrade_absent="1"
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debug_message "is_maco_upgrade_absent − \
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Maco upgrade seems available."
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## Check if temp Maco urgent upgrade file is present
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elif [ -f "${MACO_TMP_URGENT_FILE}" ]; then
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return_maco_upgrade_absent="1"
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debug_message "is_maco_upgrade_absent − \
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Maco urgent upgrade seems available."
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else
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debug_message "is_maco_upgrade_absent − \
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No Maco upgrade require."
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fi
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return "${return_maco_upgrade_absent}"
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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="${1}"
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## List SGE informations about the host
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### And get the number of used slots from all queues
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### Sort the results
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### Only get the last result (greater number of used slots)
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local_sge_slots_used=$(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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| sort --numeric-sort \
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| tail --lines=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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* ) ## Some jobs are running
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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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procs running (with the pattern: ${RED}${local_proc_pattern}${COLOR_DEBUG}) on the current host: ${RED}${local_count_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 APT package upgrade is available
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### Exit (wait for APT upgrade to finish first)
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is_apt_upgrade_present \
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&& exit 0
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## If Maco upgrade is absent
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### Exit
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is_maco_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 "${sge_hostname}" \
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&& exit 0
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## If anything related to maco is currently running
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### Exit
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is_proc_running "${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 255
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