From 7e0f0d96b6c63141c879d834ebc8c648bdf5a038 Mon Sep 17 00:00:00 2001
From: "Christopher J. Morrone" <morrone2@llnl.gov>
Date: Thu, 5 May 2011 15:08:44 -0700
Subject: [PATCH] LU-278 Improve regex for output of git describe

Improve the regex in version_tag-git.pl to properly parse the output
then the current commit is tagged, and when the tag names are longer
than just the digits used in the upstream version tags.

Addition from Ned:

Trim trailing newline from git describe output in the
case where the current commit is tagged.

Change-Id: I0a6a1b54f9e2dbd381a6d00f9dcf47d9b8b66616
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/509
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Brian J. Murrell <brian@whamcloud.com>
Reviewed-by: Christopher J. Morrone <chris.morrone.llnl@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---
 lustre/scripts/version_tag-git.pl | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/lustre/scripts/version_tag-git.pl b/lustre/scripts/version_tag-git.pl
index 4912de8..1f0dbf4 100644
--- a/lustre/scripts/version_tag-git.pl
+++ b/lustre/scripts/version_tag-git.pl
@@ -30,10 +30,28 @@ sub get_tag()
 
 }
 
+# "git describe" will just return a tag name if the current commit is
+# tagged.  Otherwise, the output will look something like this:
+#
+#     <tag name>-<commits beyong tag>-g<hash>
+#
+# Examples:
+#     2.0.59-1-g4c20b1f
+#     2.0.59-1somecompany-1-g4c20b1f
+#     foobar-15-g2e937ca
+#
 my $desc=`git describe --tags`;
-$desc =~ /([^-]+)(?:-(.+)-(.+))?\n/;
-$tag = $1;
-$fcoms = $2;
-$hash = $3;
+if ($desc =~ /(.+?)(?:-(\d)+-g([0-9a-f]+))\n?/) {
+    # tag with describe info added
+    $tag = $1;
+    $fcoms = $2;
+    $hash = $3;
+} else {
+    # plain tag
+    $tag = $desc;
+    chomp $tag;
+    $fcoms = 0;
+    $hash = "";
+}
 
 1;
-- 
1.8.3.1