postinst is in git-core 1:1.7.9.5-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #!/bin/sh
set -e
test "$1" = configure || exit 0
test -n "$2" || exit 0
dpkg --compare-versions "$2" le '1:1.7.0.4-2' || exit 0
test -d /usr/share/doc/git-core || exit 0
if ! rmdir /usr/share/doc/git-core; then
echo Moving /usr/share/doc/git-core to /usr/share/doc/git/git-core.old >&2
mv -f /usr/share/doc/git-core /usr/share/doc/git/git-core.old
fi
ln -s git /usr/share/doc/git-core
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