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 2f78359..7a964ad 100644
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -313,3 +313,15 @@
}
: ${GIT_OBJECT_DIRECTORY="$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
+}
