This file is indexed.

postinst is in git-daemon-sysvinit 1:2.7.4-0ubuntu1.

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.

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#!/bin/sh
set -e

test "$1" = 'configure' || exit 0

getent passwd gitdaemon >/dev/null || \
  adduser --system --home /nonexistent --no-create-home gitdaemon

if [ -x "/etc/init.d/git-daemon" ]; then
	# enable git-daemon service
	update-rc.d git-daemon defaults >/dev/null

	# restart git-daemon service if it was running
	if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
		invoke-rc.d git-daemon start || exit $?
	else
		/etc/init.d/git-daemon start || exit $?
	fi
fi