James Denholm <nod.h...@gmail.com> writes:

> cmd_add_commit() is passed FETCH_HEAD by cmd_add_repository, which is
> then rev-parsed into an object ID. However, if the user is fetching a
> tag rather than a branch HEAD, such as by executing:
>
> $ git subtree add -P oldGit https://github.com/git/git.git tags/v1.8.0
>
> The object ID is a tag and is never peeled, and the git commit-tree call
> (line 561) slaps us in the face because it doesn't handle tag IDs.
>
> Because peeling a committish ID doesn't do anything if it's already a
> commit, fix by peeling[1] the object ID before assigning it to $rev, as
> per the patch.
>
> [*1*]: Via peel_committish(), from git:git-sh-setup.sh, pre-existing
> dependency of git-subtree.
>
> Reported-by: Kevin Cagle <kca...@micron.com>
> Helped-by: Junio C Hamano <gits...@pobox.com>
> Signed-off-by: James Denholm <nod.h...@gmail.com>
> ---
> I felt that defining revp would be a little more self-documenting than
> using $rev^0.

That is a good decision, but as long as we are attempting to peel,
don't we want to stop the damage when it does not peel to a commit?

I'll tentatively queue this.  Thanks.

-- >8 --
From: James Denholm <nod.h...@gmail.com>
Date: Tue, 13 May 2014 14:08:58 +1000
Subject: [PATCH] contrib/subtree: allow adding an annotated tag

cmd_add_commit() is passed FETCH_HEAD by cmd_add_repository, which
is then rev-parsed into an object name.  However, if the user is
fetching a tag rather than a branch HEAD, such as by executing:

  $ git subtree add -P oldGit https://github.com/git/git.git tags/v1.8.0

the object name refers to a tag and is never peeled, and the git
commit-tree call (line 561) slaps us in the face because it doesn't
peel tags to commits.

Because peeling a committish doesn't do anything if it's already a
commit, fix by peeling the object name before assigning it to $rev,
using peel_committish() from git:git-sh-setup.sh, a pre-existing
dependency of git-subtree.

Reported-by: Kevin Cagle <kca...@micron.com>
Helped-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: James Denholm <nod.h...@gmail.com>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 contrib/subtree/git-subtree.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/contrib/subtree/git-subtree.sh b/contrib/subtree/git-subtree.sh
index db925ca..fa1a583 100755
--- a/contrib/subtree/git-subtree.sh
+++ b/contrib/subtree/git-subtree.sh
@@ -558,8 +558,9 @@ cmd_add_commit()
                commit=$(add_squashed_msg "$rev" "$dir" |
                         git commit-tree $tree $headp -p "$rev") || exit $?
        else
+               revp=$(peel_committish "$rev") &&
                commit=$(add_msg "$dir" "$headrev" "$rev" |
-                        git commit-tree $tree $headp -p "$rev") || exit $?
+                        git commit-tree $tree $headp -p "$revp") || exit $?
        fi
        git reset "$commit" || exit $?
        
-- 
2.0.0-rc3-404-gb0be553

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