Use 'git describe' for working builds

[mirror_spl-debian.git] / config / spl-meta.m4

diff --git a/config/spl-meta.m4 b/config/spl-meta.m4
index af8be801a94e2d27580a0644634eee7de7719c8e..28103bc103aa7a3dcdc2781e783257a4c7ca3c59 100644 (file)
--- a/config/spl-meta.m4
+++ b/config/spl-meta.m4
@@ -2,16 +2,20 @@
 # Written by Chris Dunlap <cdunlap@llnl.gov>.
 # Modified by Brian Behlendorf <behlendorf1@llnl.gov>.
 ###############################################################################
-# SPL_AC_META: Read metadata from the META file.
+# SPL_AC_META: Read metadata from the META file.  When building from a
+# git repository the SPL_META_RELEASE field will be overwritten if there
+# is an annotated tag matching the form SPL_META_NAME-SPL_META_VERSION-*.
+# This allows for working builds to be uniquely identified using the git
+# commit hash.
 ###############################################################################
 
 AC_DEFUN([SPL_AC_META], [
        AC_MSG_CHECKING([metadata])
 
        META="$srcdir/META"
-       _spl_ac_meta_got_file=no
+       _spl_ac_meta_type="none"
        if test -f "$META"; then
-               _spl_ac_meta_got_file=yes
+               _spl_ac_meta_type="META file"
 
                SPL_META_NAME=_SPL_AC_META_GETVAL([(?:NAME|PROJECT|PACKAGE)]);
                if test -n "$SPL_META_NAME"; then
@@ -30,6 +34,16 @@ AC_DEFUN([SPL_AC_META], [
                fi
 
                SPL_META_RELEASE=_SPL_AC_META_GETVAL([RELEASE]);
+               if git rev-parse --git-dir > /dev/null 2>&1; then
+                       _match="${SPL_META_NAME}-${SPL_META_VERSION}*"
+                       _alias=$(git describe --match=${_match} 2>/dev/null)
+                       _release=$(echo ${_alias}|cut -f3- -d'-'|sed 's/-/_/g')
+                       if test -n "${_release}"; then
+                               SPL_META_RELEASE=${_release}
+                               _spl_ac_meta_type="git describe"
+                       fi
+               fi
+
                if test -n "$SPL_META_RELEASE"; then
                        AC_DEFINE_UNQUOTED([SPL_META_RELEASE], ["$SPL_META_RELEASE"],
                                [Define the project release.]
@@ -97,7 +111,7 @@ AC_DEFUN([SPL_AC_META], [
                fi
        fi
 
-       AC_MSG_RESULT([$_spl_ac_meta_got_file])
+       AC_MSG_RESULT([$_spl_ac_meta_type])
        ]
 )