[RFC PATCH] GIT-VERSION-GEN: restrict tags used

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Restrict the tags used to generate the version string to those that
begin with "v", since git's tags for git-core (ie. excluding git-gui)
are all of the form "vX.Y...".

This is to avoid using private tags by the user in a clone of the git
code repository, which may break certain machinery (eg. Makefile).

Signed-off-by: Tay Ray Chuan <rctay89@xxxxxxxxx>
---

  Ran into this after tagging a topic branch and running make.

  Although a "v.*" match does not guarantee the non-usage of private
  tags, I feel it's an acceptable level of accuracy.

  After this patch, perhaps we could advertise somewhere to git hackers
  that tags beginning with "v" should be avoided.

 GIT-VERSION-GEN |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 59219bd..28b4d56 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -12,7 +12,7 @@ if test -f version
 then
 	VN=$(cat version) || VN="$DEF_VER"
 elif test -d .git -o -f .git &&
-	VN=$(git describe --abbrev=4 HEAD 2>/dev/null) &&
+	VN=$(git describe --match "v*" --abbrev=4 HEAD 2>/dev/null) &&
 	case "$VN" in
 	*$LF*) (exit 1) ;;
 	v[0-9]*)
--
1.7.1.189.g07419

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