scripts/make_gitrev.sh

   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
  28 set -eu
  29
  30 dist=no
  31 distdir=.
  32 while getopts D: flag
  33 do
  34         case $flag in
  35                 \?) echo "Usage: $0 [-D distdir] [file]" >&2; exit 1;;
  36                 D)  dist=yes; distdir=${OPTARG};;
  37                 *)  ;;
  38         esac
  39 done
  40 shift $((OPTIND - 1))
  41
  42 top_srcdir="$(dirname "$0")/.."
  43 GITREV="${1:-include/zfs_gitrev.h}"
  44
  45 # GITREV should be a relative path (relative to top_builddir or distdir)
  46 case "${GITREV}" in
  47         /*) echo "Error: ${GITREV} should be a relative path" >&2
  48             exit 1;;
  49         *) ;;
  50 esac
  51
  52 ZFS_GITREV=$({ cd "${top_srcdir}" &&
  53         git describe --always --long --dirty 2>/dev/null; } || :)
  54
  55 if [ -z "${ZFS_GITREV}" ]
  56 then
  57         # If the source directory is not a git repository, check if the file
  58         # already exists (in the source)
  59         if [ -f "${top_srcdir}/${GITREV}" ]
  60         then
  61                 ZFS_GITREV=$(sed -n \
  62                         '1s/^#define[[:blank:]]ZFS_META_GITREV "\([^"]*\)"$/\1/p' \
  63                         "${top_srcdir}/${GITREV}")
  64         fi
  65 elif [ "${dist}" = yes ]
  66 then
  67         # Append -dist when creating distributed sources from a git repository
  68         ZFS_GITREV="${ZFS_GITREV}-dist"
  69 fi
  70 ZFS_GITREV=${ZFS_GITREV:-unknown}
  71
  72 GITREVTMP="${GITREV}~"
  73 printf '#define\tZFS_META_GITREV "%s"\n' "${ZFS_GITREV}" >"${GITREVTMP}"
  74 GITREV="${distdir}/${GITREV}"
  75 if cmp -s "${GITREV}" "${GITREVTMP}"
  76 then
  77         rm -f "${GITREVTMP}"
  78 else
  79         mv -f "${GITREVTMP}" "${GITREV}"
  80 fi