preinst is in gnuit 4.9.5-3build2.
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 | #!/bin/sh
set -e
if update-alternatives --list git | fgrep /usr/bin/git.transition >/dev/null
then
update-alternatives --auto git
update-alternatives --remove git /usr/bin/git.transition
fi
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