On Fri, 8 Jan 2010 11:23:44 +0000
Jurriaan <[email protected]> wrote:
> However, I do wonder if there is any way to make snapshot of the
> current versions of all packages, then update, and then, if
> necessary, revert back to the previous snapshot.
I do my upgrades using a little script.
#!/bin/sh
# /root/bin/getafix
# Script to save packages to be upgraded in /root/lib/upgrade/$DATE
# using dpkg-repack
# In case something goes wrong, whilst upgrading, a simple dpkg -i
/root/lib/upgrade/$DATE/*
# will (hopefully) rebuild a working system.
#set -x
apt-get update
# d-ated dir-ectory
DDIR="/root/lib/upgrades/"`date +%Y-%m-%d_%H:%M:%S`
echo $DDIR
# p-ackages t-o b-e u-pgraded
PTBU=`apt-get -s upgrade | grep "The following packages will be upgraded:"
--after-context=1 | grep "^ "`
echo PTBU="->"$PTBU"<-"
if [[ -n $PTBU ]]; then # PTBU non-zero
mkdir $DDIR
cd $DDIR
dpkg-repack $PTBU
else
echo "No upgrades"
fi
So if anything goes wrong i only have to
cd /root/lib/upgrades/`date +%Y-%m-%d_%H:%M:%S`
and
dpkg -i *
When dist-upgrading this will probably produce tons of packages in
/root/lib/upgrades/
Another way would be to simply copy the partitions involved (with dd) make the
upgrade and write them back i anything goes wrong.
Cheers
Michael
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