prerm is in git-daemon-run 1:2.17.0-1ubuntu1.
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
test "$1" = 'remove' || test "$1" = 'deconfigure' || \
test "$1" = 'failed-upgrade' || exit 0
update-service --remove /etc/sv/git-daemon || :
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