Re: git-merge fails when trying to merge from a tag

[Junio C Hamano <junkio@cox.net>]

Carl Baldwin <cnb@fc.hp.com> writes:

> I just tried to merge using a tag object.

Thanks for the report.

> % git merge "Merging release-0.3.1" HEAD refs/tags/release-0.3.1

Once I considered changing commit-tree to take any committish
after -p, but thought the command is a low level primitive and
the user should know what he is doing, but apparently, git-merge
does not know what it is doing ;-).

In fact, I never use "merge" myself, and haven't noticed this
breakage until now (you would notice that the Everyday document
never talks about "git merge").  Instead, I always do this:

	$ git pull . tag release-0.3.1

But you are right.  It is advertised as the end-user
command and demonstrated in the tutorial.

How about this patch?  I haven't looked at what (old)
git-resolve and git-octopus commands do --- they may need
similar parameter massaging.

-- >8 --
[PATCH] allow merging any committish

Although "git-merge" is advertised as the end-user level command
(instead of being a "git-pull" backend), it was not prepared to
take tag objects that point at commits and barfed when fed one.
Sanitize the input while we validate them, for which we already
have a loop.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---
diff --git a/git-merge.sh b/git-merge.sh
index a221daa..d25ae4b 100755
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -97,11 +97,14 @@ head=$(git-rev-parse --verify "$1"^0) ||
 shift
 
 # All the rest are remote heads
+remoteheads=
 for remote
 do
-	git-rev-parse --verify "$remote"^0 >/dev/null ||
+	remotehead=$(git-rev-parse --verify "$remote"^0) ||
 	    die "$remote - not something we can merge"
+	remoteheads="${remoteheads}$remotehead "
 done
+set x $remoteheads ; shift
 
 case "$#" in
 1)