[nagiosplug] sfsnapshotgit: Better handling of remote refs

[Thomas Guyot-Sionnest]

 Module: nagiosplug
 Branch: master
 Commit: 654086f1117ee22d9f7e8270330daff6c463c9ad
 Author: Thomas Guyot-Sionnest <dermoth at aei.ca>
   Date: Mon Oct 11 21:38:42 2010 -0400
    URL: http://nagiosplug.git.sf.net/git/gitweb.cgi?p=nagiosplug/nagiosplug;a=commit;h=654086f

sfsnapshotgit: Better handling of remote refs

This commit allow to track branches from unusually-named remote refs and
makes possible using external remotes (other than origin) for snapshots.

---

 tools/sfsnapshotgit |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/tools/sfsnapshotgit b/tools/sfsnapshotgit
index e79dd55..8bc19fc 100755
--- a/tools/sfsnapshotgit
+++ b/tools/sfsnapshotgit
@@ -44,11 +44,17 @@ cd "$SFSNAP_REPO"
 # Sometimes "make dist" can modify versioned files so we must reset first
 git reset --hard
 git clean -qfdx
-# Any branch used to create snapshots must already exist
+
+# Any branch used to create snapshots must already exist and be properly configured
 git checkout "$HEAD"
-git fetch "$SFSNAP_ORIGIN"
-git reset --hard "$SFSNAP_ORIGIN"/"$HEAD"
-# Tags are important for git-describe
+
+# Get the remote tracking branch from config
+origin=$(git config branch.$HEAD.remote)
+ref=$(git config branch.$HEAD.merge |sed -e 's|^refs/heads/||')
+git fetch "$origin"
+git reset --hard "$origin/$ref"
+
+# Tags are important for git-describe, but take only the ones from the hard-coded origin
 git fetch --tags "$SFSNAP_ORIGIN"
 
 # Write our snapshot version string (similar to NP-VERSION-GEN) to "release"