#!/bin/sh
# postinst script for gitolite
# Copyright 2010-2011 by Gerfried Fuchs <rhonda@debian.org>
# Licenced under WTFPLv2

set -e


# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

pkg=gitolite3
etcdir=/etc/$pkg

relink_rc () {
    cd $1

    mv .gitolite.rc $etcdir/gitolite.rc
    chown root:root $etcdir/gitolite.rc
    chmod 0644 $etcdir/gitolite.rc
    ln -s $etcdir/gitolite.rc .gitolite.rc
}

# Source debconf library.
if [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
fi

action=$1
version=$2
if [ "${DEBCONF_RECONFIGURE}" = "1" ]; then
	# workaround until reconfigure is really available
	action=reconfigure
fi

if [ "$action" = "configure" ]; then
    db_get $pkg/gitdir
    GITDIR="${RET:-/var/lib/$pkg}"

    db_get $pkg/gitdir
    GITDIR="${RET:-/var/lib/$pkg}"

    oldrc="$GITDIR/.gitolite.rc"
    # migrate existing config file to /etc
    if [ -f "${oldrc}" -a ! -L "${oldrc}" ]; then
	relink_rc "$GITDIR"
    fi

fi

# only on new install or reconfigure
if [ "x$version" = "x" ] || [ "$action" = "reconfigure" ]; then

    # we only attempt to configure once, even if using reconfigure
    if [ -f $etcdir/gitolite.rc ]; then
	echo "gitolite configuration already exists in $etcdir, doing nothing." 1>&2
	exit 0
    fi

	db_get $pkg/gituser
	GITUSER="${RET:-$pkg}"

	db_get $pkg/gitdir
	GITDIR="${RET:-/var/lib/$pkg}"

	db_get $pkg/adminkey
	ADMINKEY="$RET"
	# set it back to empty after use
	db_set $pkg/adminkey ""


	# all this makes only sense when we have been given an admin key
	# to initialize with
	if [ -n "$ADMINKEY" ]; then

		if ! getent passwd "$GITUSER" >/dev/null; then
			adduser --quiet --system --home "$GITDIR" --shell /bin/bash \
				--no-create-home --gecos 'git repository hosting' \
				--group "$GITUSER"
		fi

		if [ ! -r "$GITDIR/.gitolite.rc" ]; then
			if [ ! -d "$GITDIR" ]; then
				mkdir -p "$GITDIR"
				chown "$GITUSER":"$GITUSER" "$GITDIR"
			fi

			# create admin repository
			tmpdir="$(mktemp -d)"
			if [ -r "$ADMINKEY" ]; then
				# key file
				cat "$ADMINKEY" > "$tmpdir/admin.pub"
			else
				# possibly pasted key
				echo "$ADMINKEY" > "$tmpdir/admin.pub"
			fi
			chown -R "$GITUSER" "$tmpdir"
			su - $GITUSER -c "gitolite setup -pk '$tmpdir/admin.pub'"
			rm -r "$tmpdir"
			relink_rc "$GITDIR"
		else
			echo "gitolite seems to be already set up in $GITDIR, doing nothing." 1>&2
		fi

	else
		echo "No adminkey given - not setting up gitolite. Do a dpkg-reconfigure to setup." 1>&2
	fi

fi

exit 0