[PATCH 2/3] sh-setup: add new peel_committish() helper

From: Ramkumar Ramachandra <artagnon@gmail.com>
Date: Jun 13, 2013, 18:16 UTC
Message-ID: <1371147362-26962-3-git-send-email-artagnon@gmail.com>
In-Reply-To: <1371147362-26962-1-git-send-email-artagnon@gmail.com>

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>
---
 git-sh-setup.sh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 2f78359..6ae19a6 100644
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -313,3 +313,16 @@ then
 	}
 	: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
 fi
+
+peel_committish () {
+	test $# -gt 1 && quiet="--quiet" || quiet=""
+	case "$1" in
+	:/*)
+		peeltmp=$(git rev-parse --verify $quiet "$1") &&
+		git rev-parse --verify "${peeltmp}^0"
+		;;
+	*)
+		git rev-parse --verify "${1}^0"
+		;;
+	esac
+}

-- 
1.8.3.1.381.g31c8856.dirty