On Fri, Jan 07, 2011 at 09:49:49AM +1100, Peter Howard wrote:
> On Tue, 2011-01-04 at 14:44 -0800, Vagrant Cascadian wrote:
> > zoneminder could detect non-default/unknown symlink
> > locations in the preinst script, and fail to upgrade in those cases; not
> > pretty, but maybe better than loosing the database data.
>
> In the short term, I don't think there's a neater solution than that. I
> think we should go with the "bail out update with warning" approach.
here's a preinst which i think should accomplish this safely:
#!/bin/sh
set -e
abort=false
if [ -L /usr/share/zoneminder/events ]; then
l=$(readlink /usr/share/zoneminder/events)
if [ "$l" != "/var/cache/zoneminder/events" ]; then
abort=true
fi
fi
if [ -L /usr/share/zoneminder/images ]; then
l=$(readlink /usr/share/zoneminder/images )
if [ "$l" != "/var/cache/zoneminder/images" ]; then
abort=true
fi
fi
if [ "$abort" = "true" ]; then
cat >&2 << EOF
Aborting installation of zoneminder due to non-default symlinks in
/usr/share/zoneminder for the images and/or events directory, which could
result in loss of data. Please move your data in each of these directories to
/var/cache/zoneminder before installing zoneminder from the package.
EOF
exit 1
fi
#DEBHELPER#
exit 0
though the warning could use some improvement.
looking at the fast approaching squeeze release, and the possibility of
data-loss for people switching from manual/source installs to the package, i
think it might be worth including this now. long-term, something more
sophisticated and intelligent will definitely be needed.
live well,
vagrant
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