On Tue, Oct 07, 2014 at 09:52:33AM -0700, Junio C Hamano wrote:
> Duy Nguyen <pclo...@gmail.com> writes:
> 
> > Hmm.. Junio already did most of the work in 051e400 (helping
> > smart-http/stateless-rpc fetch race - 2011-08-05), so all we need to
> > do is enable uploadpack.allowtipsha1inwant and apply this patch
> 
> Not that patch, I would think.
> 
> I would understand "if !stateless_rpc and !allowtipsha1 then it is
> an error", though.

Fair enough. It seems to work, technically, using the patch below. But
I think people would rather have support from "git clone" and "git
clone --branch" can't deal with SHA-1 this way yet. And --branch might
be a bad place to enable this..

So it needs more work. Any help is appreciated, as I still need to
finish my untracked cache series first and re-evaluate watchman series
before git 3.0 is released.

-- 8< --
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index 67e0ab3..bdc121e 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -1277,4 +1277,22 @@ EOF
        git push --no-thin --receive-pack="$rcvpck" no-thin/.git 
refs/heads/master:refs/heads/foo
 '
 
+test_expect_success 'shallow fetch reachable SHA1 (but not a ref)' '
+       mk_empty testrepo &&
+       (
+               cd testrepo &&
+               test_commit foo &&
+               test_commit bar
+       ) &&
+       SHA1=`git --git-dir=testrepo/.git rev-parse HEAD^` &&
+       git init shallow &&
+       (
+               cd shallow &&
+               test_must_fail git fetch --depth=1 ../testrepo/.git $SHA1 &&
+               git --git-dir=../testrepo/.git config 
uploadpack.allowtipsha1inwant true &&
+               git fetch --depth=1 ../testrepo/.git $SHA1 &&
+               git cat-file commit $SHA1 >/dev/null
+       )
+'
+
 test_done
diff --git a/upload-pack.c b/upload-pack.c
index c789ec0..4a9a656 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -454,8 +454,12 @@ static void check_non_tip(void)
        char namebuf[42]; /* ^ + SHA-1 + LF */
        int i;
 
-       /* In the normal in-process case non-tip request can never happen */
-       if (!stateless_rpc)
+       /*
+        * In the normal in-process case without
+        * uploadpack.allowtipsha1inwant, non-tip requests can never
+        * happen
+        */
+       if (!stateless_rpc && !allow_tip_sha1_in_want)
                goto error;
 
        cmd.argv = argv;
-- 8< --
--
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