postinst is in mercurial-server 1.2-2.2.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | #!/bin/sh
# postinst script for mercurial-server
set -e
# Load debconf
. /usr/share/debconf/confmodule
case "$1" in
    configure|reconfigure)
        if ! getent passwd hg >/dev/null; then
            adduser --disabled-password --quiet --system \
                --shell /bin/sh --group \
                --home /var/lib/mercurial-server \
                --gecos "Mercurial repositories" hg
            su -c "/usr/share/mercurial-server/init/hginit /usr/share/mercurial-server" hg
        fi
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dhpython:
if which pycompile >/dev/null 2>&1; then
	pycompile -p mercurial-server /usr/share/mercurial-server
fi
# End automatically added section
exit 0
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