1#!/bin/sh
2
3#
4# CDDL HEADER START
5#
6# This file and its contents are supplied under the terms of the
7# Common Development and Distribution License ("CDDL"), version 1.0.
8# You may only use this file in accordance with the terms of version
9# 1.0 of the CDDL.
10#
11# A full copy of the text of the CDDL should have accompanied this
12# source.  A copy of the CDDL is also available via the Internet at
13# http://www.illumos.org/license/CDDL.
14#
15# CDDL HEADER END
16#
17
18# Copyright (c) 2018 by Delphix. All rights reserved.
19# Copyright (c) 2018 by Matthew Thode. All rights reserved.
20
21#
22# Generate zfs_gitrev.h.  Note that we need to do this for every
23# invocation of `make`, including for incremental builds.  Therefore we
24# can't use a zfs_gitrev.h.in file which would be processed only when
25# `configure` is run.
26#
27
28set -e -u
29
30dist=no
31distdir=.
32while getopts D: flag
33do
34	case $flag in
35		\?) echo "Usage: $0 [-D distdir] [file]" >&2; exit 1;;
36		D)  dist=yes; distdir=${OPTARG};;
37	esac
38done
39shift $((OPTIND - 1))
40
41top_srcdir="$(dirname "$0")/.."
42GITREV="${1:-include/zfs_gitrev.h}"
43
44# GITREV should be a relative path (relative to top_builddir or distdir)
45case "${GITREV}" in
46	/*) echo "Error: ${GITREV} should be a relative path" >&2
47	    exit 1;;
48esac
49
50ZFS_GITREV=$({ cd "${top_srcdir}" &&
51	git describe --always --long --dirty 2>/dev/null; } || :)
52
53if [ -z "${ZFS_GITREV}" ]
54then
55	# If the source directory is not a git repository, check if the file
56	# already exists (in the source)
57	if [ -f "${top_srcdir}/${GITREV}" ]
58	then
59		ZFS_GITREV=$(sed -n \
60			'1s/^#define[[:blank:]]ZFS_META_GITREV "\([^"]*\)"$/\1/p' \
61			"${top_srcdir}/${GITREV}")
62	fi
63elif [ ${dist} = yes ]
64then
65	# Append -dist when creating distributed sources from a git repository
66	ZFS_GITREV="${ZFS_GITREV}-dist"
67fi
68ZFS_GITREV=${ZFS_GITREV:-unknown}
69
70GITREVTMP="${GITREV}~"
71printf '#define\tZFS_META_GITREV "%s"\n' "${ZFS_GITREV}" >"${GITREVTMP}"
72GITREV="${distdir}/${GITREV}"
73if cmp -s "${GITREV}" "${GITREVTMP}"
74then
75	rm -f "${GITREVTMP}"
76else
77	mv -f "${GITREVTMP}" "${GITREV}"
78fi
79