gitolite/src/VREF/DUPKEYS
Sitaram Chamarty 8bffbfa02a 3 old VREFs moved in,
untested but they're just update hooks anyway so they should work fine
2012-03-24 10:30:46 +05:30

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#!/bin/bash
# gitolite VREF to detect duplicate public keys
# see gitolite doc/vref.mkd for what the arguments are
sha=$3
# git sets this; and we don't want it at this point...
unset GIT_DIR
# paranoia
set -e
# setup the temp area
export TMPDIR=$GL_REPO_BASE_ABS
export tmp=$(mktemp -d -t gl-internal-temp-repo.XXXXXXXXXX);
trap "rm -rf $tmp" EXIT;
git archive $sha keydir | tar -C $tmp -xf -
# DO NOT try, say, 'GIT_WORK_TREE=$tmp git checkout $sha'. It'll screw up
# both the 'index' and 'HEAD' of the repo.git. Screwing up the index is
# BAD because now it goes out of sync with $GL_ADMINDIR. Think of a push
# that had a deleted pubkey but failed a hooklet for some reason. A
# subsequent push that fixes the error will now result in a $GL_ADMINDIR
# that still *has* that deleted pubkey!!
# And this is equally applicable to cases where you're using a
# post-receive or similar hook to live update a web site or something,
# which is a pretty common usage, I am given to understand.
cd $tmp
for f in `find keydir -name "*.pub"`
do
ssh-keygen -l -f "$f"
done | perl -ane '
die "FATAL: $F[2] is a duplicate of $seen{$F[1]}\n" if $seen{$F[1]};
$seen{$F[1]} = $F[2];
'
# as you can see, a vref can also 'die' if it wishes to, and it'll take the
# whole update with it if it does. No messing around with sending back a
# vref, having it run through the matches, and printing the DENIED message,
# etc. However, if your push is running from a script, and that script is
# looking for the word "DENIED" or something, then this won't work...