config/zfs-meta.m4

   1 dnl #
   2 dnl # DESCRIPTION:
   3 dnl # Read meta data from the META file.  When building from a git repository
   4 dnl # the ZFS_META_RELEASE field will be overwritten if there is an annotated
   5 dnl # tag matching the form ZFS_META_NAME-ZFS_META_VERSION-*.  This allows
   6 dnl # for working builds to be uniquely identified using the git commit hash.
   7 dnl #
   8 dnl #    The META file format is as follows:
   9 dnl #      ^[ ]*KEY:[ \t]+VALUE$
  10 dnl #
  11 dnl #    In other words:
  12 dnl #    - KEY is separated from VALUE by a colon and one or more spaces/tabs.
  13 dnl #    - KEY and VALUE are case sensitive.
  14 dnl #    - Leading spaces are ignored.
  15 dnl #    - First match wins for duplicate keys.
  16 dnl #
  17 dnl #    A line can be commented out by preceding it with a '#' (or technically
  18 dnl #    any non-space character since that will prevent the regex from
  19 dnl #    matching).
  20 dnl #
  21 dnl # WARNING:
  22 dnl #   Placing a colon followed by a space or tab (ie, ":[ \t]+") within the
  23 dnl #   VALUE will prematurely terminate the string since that sequence is
  24 dnl #   used as the awk field separator.
  25 dnl #
  26 dnl # KEYS:
  27 dnl #   The following META keys are recognized:
  28 dnl #     Name, Version, Release, Date, Author, LT_Current, LT_Revision, LT_Age
  29 dnl #
  30 dnl # Written by Chris Dunlap <cdunlap@llnl.gov>.
  31 dnl # Modified by Brian Behlendorf <behlendorf1@llnl.gov>.
  32 dnl #
  33 AC_DEFUN([ZFS_AC_META], [
  34
  35         AH_BOTTOM([
  36 #undef PACKAGE
  37 #undef PACKAGE_BUGREPORT
  38 #undef PACKAGE_NAME
  39 #undef PACKAGE_STRING
  40 #undef PACKAGE_TARNAME
  41 #undef PACKAGE_VERSION
  42 #undef STDC_HEADERS
  43 #undef VERSION])
  44
  45         AC_PROG_AWK
  46         AC_MSG_CHECKING([metadata])
  47
  48         META="$srcdir/META"
  49         _zfs_ac_meta_type="none"
  50         if test -f "$META"; then
  51                 _zfs_ac_meta_type="META file"
  52
  53                 ZFS_META_NAME=_ZFS_AC_META_GETVAL([(Name|Project|Package)]);
  54                 if test -n "$ZFS_META_NAME"; then
  55                         AC_DEFINE_UNQUOTED([ZFS_META_NAME], ["$ZFS_META_NAME"],
  56                                 [Define the project name.]
  57                         )
  58                         AC_SUBST([ZFS_META_NAME])
  59                 fi
  60
  61                 ZFS_META_VERSION=_ZFS_AC_META_GETVAL([Version]);
  62                 if test -n "$ZFS_META_VERSION"; then
  63                         AC_DEFINE_UNQUOTED([ZFS_META_VERSION], ["$ZFS_META_VERSION"],
  64                                 [Define the project version.]
  65                         )
  66                         AC_SUBST([ZFS_META_VERSION])
  67                 fi
  68
  69                 ZFS_META_RELEASE=_ZFS_AC_META_GETVAL([Release]);
  70                 if test ! -f ".nogitrelease" && git rev-parse --git-dir > /dev/null 2>&1; then
  71                         _match="${ZFS_META_NAME}-${ZFS_META_VERSION}*"
  72                         _alias=$(git describe --match=${_match} 2>/dev/null)
  73                         _release=$(echo ${_alias}|cut -f3- -d'-'|sed 's/-/_/g')
  74                         if test -n "${_release}"; then
  75                                 ZFS_META_RELEASE=${_release}
  76                                 _zfs_ac_meta_type="git describe"
  77                         fi
  78                 fi
  79
  80                 if test -n "$ZFS_META_RELEASE"; then
  81                         AC_DEFINE_UNQUOTED([ZFS_META_RELEASE], ["$ZFS_META_RELEASE"],
  82                                 [Define the project release.]
  83                         )
  84                         AC_SUBST([ZFS_META_RELEASE])
  85
  86                         RELEASE="$ZFS_META_RELEASE"
  87                         AC_SUBST([RELEASE])
  88                 fi
  89
  90                 ZFS_META_LICENSE=_ZFS_AC_META_GETVAL([License]);
  91                 if test -n "$ZFS_META_LICENSE"; then
  92                         AC_DEFINE_UNQUOTED([ZFS_META_LICENSE], ["$ZFS_META_LICENSE"],
  93                                 [Define the project license.]
  94                         )
  95                         AC_SUBST([ZFS_META_LICENSE])
  96                 fi
  97
  98                 if test -n "$ZFS_META_NAME" -a -n "$ZFS_META_VERSION"; then
  99                                 ZFS_META_ALIAS="$ZFS_META_NAME-$ZFS_META_VERSION"
 100                                 test -n "$ZFS_META_RELEASE" &&
 101                                         ZFS_META_ALIAS="$ZFS_META_ALIAS-$ZFS_META_RELEASE"
 102                                 AC_DEFINE_UNQUOTED([ZFS_META_ALIAS],
 103                                         ["$ZFS_META_ALIAS"],
 104                                         [Define the project alias string.]
 105                                 )
 106                                 AC_SUBST([ZFS_META_ALIAS])
 107                 fi
 108
 109                 ZFS_META_DATA=_ZFS_AC_META_GETVAL([Date]);
 110                 if test -n "$ZFS_META_DATA"; then
 111                         AC_DEFINE_UNQUOTED([ZFS_META_DATA], ["$ZFS_META_DATA"],
 112                                 [Define the project release date.]
 113                         )
 114                         AC_SUBST([ZFS_META_DATA])
 115                 fi
 116
 117                 ZFS_META_AUTHOR=_ZFS_AC_META_GETVAL([Author]);
 118                 if test -n "$ZFS_META_AUTHOR"; then
 119                         AC_DEFINE_UNQUOTED([ZFS_META_AUTHOR], ["$ZFS_META_AUTHOR"],
 120                                 [Define the project author.]
 121                         )
 122                         AC_SUBST([ZFS_META_AUTHOR])
 123                 fi
 124
 125                 m4_pattern_allow([^LT_(CURRENT|REVISION|AGE)$])
 126                 ZFS_META_LT_CURRENT=_ZFS_AC_META_GETVAL([LT_Current]);
 127                 ZFS_META_LT_REVISION=_ZFS_AC_META_GETVAL([LT_Revision]);
 128                 ZFS_META_LT_AGE=_ZFS_AC_META_GETVAL([LT_Age]);
 129                 if test -n "$ZFS_META_LT_CURRENT" \
 130                                  -o -n "$ZFS_META_LT_REVISION" \
 131                                  -o -n "$ZFS_META_LT_AGE"; then
 132                         test -n "$ZFS_META_LT_CURRENT" || ZFS_META_LT_CURRENT="0"
 133                         test -n "$ZFS_META_LT_REVISION" || ZFS_META_LT_REVISION="0"
 134                         test -n "$ZFS_META_LT_AGE" || ZFS_META_LT_AGE="0"
 135                         AC_DEFINE_UNQUOTED([ZFS_META_LT_CURRENT],
 136                                 ["$ZFS_META_LT_CURRENT"],
 137                                 [Define the libtool library 'current'
 138                                  version information.]
 139                         )
 140                         AC_DEFINE_UNQUOTED([ZFS_META_LT_REVISION],
 141                                 ["$ZFS_META_LT_REVISION"],
 142                                 [Define the libtool library 'revision'
 143                                  version information.]
 144                         )
 145                         AC_DEFINE_UNQUOTED([ZFS_META_LT_AGE], ["$ZFS_META_LT_AGE"],
 146                                 [Define the libtool library 'age'
 147                                  version information.]
 148                         )
 149                         AC_SUBST([ZFS_META_LT_CURRENT])
 150                         AC_SUBST([ZFS_META_LT_REVISION])
 151                         AC_SUBST([ZFS_META_LT_AGE])
 152                 fi
 153         fi
 154
 155         AC_MSG_RESULT([$_zfs_ac_meta_type])
 156         ]
 157 )
 158
 159 dnl # _ZFS_AC_META_GETVAL (KEY_NAME_OR_REGEX)
 160 dnl #
 161 dnl # Returns the META VALUE associated with the given KEY_NAME_OR_REGEX expr.
 162 dnl #
 163 dnl # Despite their resemblance to line noise,
 164 dnl #   the "@<:@" and "@:>@" constructs are quadrigraphs for "[" and "]".
 165 dnl #   <www.gnu.org/software/autoconf/manual/autoconf.html#Quadrigraphs>
 166 dnl #
 167 dnl # The "$[]1" and "$[]2" constructs prevent M4 parameter expansion
 168 dnl #   so a literal $1 and $2 will be passed to the resulting awk script,
 169 dnl #   whereas the "$1" will undergo M4 parameter expansion for the META key.
 170 dnl #
 171 AC_DEFUN([_ZFS_AC_META_GETVAL],
 172         [`$AWK -F ':@<:@ \t@:>@+' '$[]1 ~ /^ *$1$/ { print $[]2; exit }' $META`]dnl
 173 )