mirror of
https://github.com/schoebel/mars
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115 lines
3.2 KiB
Bash
115 lines
3.2 KiB
Bash
#!/bin/bash
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# TST Nov 2020
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# Tried to make any operations as idempotent as possible.
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#
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# At the moment, idempotent startup fails with a message like
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# "Failed to start transient scope unit: Unit infongws-test06.scope already exists."
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# Theoretically, I could treat the existence and/or the runtime status of said intermediate scope unit
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# as an indicator for directly reporting success.
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# However, I am unsure what could be the consequences when the main LXC container fails but the
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# scope unit persists for whatever reason. Possibly, it could remain in a state where it could be
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# neither startable nor stoppable.
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# Leaving this kind of behaviour untouched for now.
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# Currently, it doesn't seem to produce harm, but rather looks like a false-positive error message.
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# In case somebody would be confused by this error message, some other parts of nodeagent
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# (which is outside of my scope) should be fixed, in preference to trying to workaround it here.
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# Markers for the template processor
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# DEFAULT_START
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# DEFAULT_STOP
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# KEEP_RUNNING
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# ALSO=mars-@escvar{res}-trigger.path
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# ALSO=mars-@escvar{res}-trigger.service
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op="$1"
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# Ensure that pure trigger does not change anything.
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systemd_want_path="/mars/resource-@{res}/systemd-want"
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systemd_copy_path="/mars/resource-@{res}/userspace/systemd-want"
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systemd_want="$(stat --printf="%Y\n" $systemd_want_path)"
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systemd_copy="$(stat --printf="%Y\n" $systemd_copy_path)"
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echo "Old timestamp: '$systemd_copy'"
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echo "New timestamp: '$systemd_want'"
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if (( systemd_copy && systemd_want == systemd_copy )); then
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echo "Unmodified timestamp $systemd_want_path $systemd_want"
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exit 0
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fi
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function report_success
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{
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rsync -av $systemd_want_path $systemd_copy_path
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}
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mars_dev=/dev/mars/@{res}
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case "$op" in
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status)
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/usr/sbin/nodeagent status @{res}
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;;
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start)
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# Assumption: start and vmstart seem to be idempotent already
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if ! [[ -b $mars_dev ]]; then
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echo "ignoring, $mars_dev is not present"
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exit 0
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fi
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if mountpoint /vol/@{res}; then
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/usr/sbin/nodeagent vmstart @{res}
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else
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/usr/sbin/nodeagent start @{res}
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fi
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rc=$?
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if (( !rc )); then
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report_success
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fi
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exit $rc
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;;
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stop)
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# The following does not work: if ! mountpoint /vol/@{res}; then ...; fi
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# In the presence of bind mounts, the main mountpoint may vanish,
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# but sub-bindmounts may persist, leaving /dev/mars/@{res} opened,
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# and consequently hindering a planned handover.
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# This is a Linux kernel feature, not a bug.
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# Thus we need to mistrust the main mountpoint /vol/@{res} .
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# For safety, check the presence of /dev/mars/@{res} instead.
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if ! [[ -b "/dev/mars/@{res}" ]]; then
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# Idempotence
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exit 0
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fi
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if ! [[ -b $mars_dev ]]; then
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echo "ignoring, $mars_dev is not present"
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exit 0
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fi
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# Additionally, check whether the mars device is opened.
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if (( !$(marsadm view-device-opened @{res}) )); then
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# Idempotence
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exit 0
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fi
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/usr/sbin/nodeagent stop @{res}
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rc=$?
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# for safety
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if (( !rc )); then
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sleep 1
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if mountpoint /vol/@{res}; then
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umount /vol/@{res}
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fi
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report_success
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fi
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exit $rc
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;;
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*)
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# Ignore all other ops, like enable / disable / etc
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echo "Ignore '$op'"
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exit 0
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esac
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exit 0
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