From: Ramkumar Ramachandra <artagnon@gmail.com>
Date: Fri, 14 Jun 2013 13:17:51 +0000 (+0530)
Subject: sh-setup: add new peel_committish() helper
X-Git-Tag: v1.8.4-rc0~138^2~1
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=bac1ddd0f86bc5955c24f89e402de80d2844efb5;p=thirdparty%2Fgit.git

sh-setup: add new peel_committish() helper

The normal way to check whether a certain revision resolves to a valid
commit is:

  $ git rev-parse --verify $REV^0

Unfortunately, this does not work when $REV is of the type :/quuxery.
Write a helper to work around this limitation.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 2f7835941e..7a964ad2ff 100644
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -313,3 +313,15 @@ then
 	}
 	: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
 fi
+
+peel_committish () {
+	case "$1" in
+	:/*)
+		peeltmp=$(git rev-parse --verify "$1") &&
+		git rev-parse --verify "${peeltmp}^0"
+		;;
+	*)
+		git rev-parse --verify "${1}^0"
+		;;
+	esac
+}