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30 lines
854 B
30 lines
854 B
5 years ago
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#!/bin/bash
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set -e
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# 2 locks are needed. The first one ensure we don't run
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# The pre-backup script twice. It's an atomic lock.
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# Then we need a second lock which will last until the post-backup ran
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# This one doesn't need to be atomic (as we already checked this)
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PRELOCKFILE="/var/lock/pre-bkp.lock"
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exec 200>$PRELOCKFILE
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flock -n 200 || ( echo "Couldn't aquire pre-backup lock" && exit 1 )
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PID=$$
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echo $PID 1>&200
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if [ -e /var/lock/bkp.lock ]; then
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# Consider the lock to be stale if it's older than 8 hours
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if [ "$(( $(date +"%s") - $(stat -c "%Y" /var/lock/bkp.lock) ))" -gt "28800" ]; then
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rm /var/lock/bkp.lock
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else
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echo "Another backup is running"
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exit 1
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fi
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fi
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touch /var/lock/bkp.lock
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if [ -d "/etc/backup/pre.d" ]; then
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for H in $(find /etc/backup/pre.d -type f -o -type l | sort); do
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[ -x $H ] && $H "$@"
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done
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fi
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