On Sat, 03 May 2008 15:08:46 +0200 Goswin von Brederlow wrote: > Otavio Salvador <[EMAIL PROTECTED]> writes: > > > Francesco Poli <[EMAIL PROTECTED]> writes: [...] > >> If /etc/cron.daily/apt has something to do on the system (because APT > >> was configured accordingly), then, when the cache cannot be > >> locked, /etc/cron.daily/apt cannot do its job and it should indeed exit > >> *with errors* to alert the administrator that something went wrong! > > Does it at least wait a while? It is a daily jobs and if it runs an > hour late because the cache was locked nobody will mind. An error mail > just because apt-get was in use at the time cron.daily triggered is > anoying though.
No, it currently does not wait.
It just gives up and exits.
A wait & retry mechanism could be implemented, but... will it delay the
remaining cron daily jobs, as well?
Something like the following, so to speak:
# if needed...
if [ ! $UpdateInterval -eq 0 ] ||
[ ! $DownloadUpgradeableInterval -eq 0 ] ||
[ ! $UnattendedUpgradeInterval -eq 0 ] ||
[ ! $AutocleanInterval -eq 0 ]; then
# check if we can lock the cache and if the cache is clean
if ! apt-get check -q -q 2>/dev/null; then
sleep $LockedCacheRetryDelay
# retry
if ! apt-get check -q -q 2>/dev/null; then
echo "$0: could not lock the APT cache"
exit 1
fi
fi
fi
where LockedCacheRetryDelay is the delay length (in seconds) and should
be set at the beginning of the script, or, even better, turned into an
APT configuration variable...
Possible value:
LockedCacheRetryDelay=900 # 15 minutes
Once again, to the extent it is copyrighted, I hereby release the above
code fragment under the same terms of /etc/cron.daily/apt, that is to
say, under the terms of the GNU General Public License (GPL), version 2
or later, as published by the Free Software Foundation.
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..................................................... Francesco Poli .
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