On 10/06/15 18:04, Christopher Dunn wrote:
Sorry. I thought empty patches were made to work in other cases.

'git-p4' needs to skip these. Wrong mailing list then.

Possibly the right mailing list - can you explain what you mean here w.r.t git-p4 please?

Thanks!
Luke





On Tue, Jun 9, 2015 at 1:52 PM, Jens Lehmann <jens.lehm...@web.de> wrote:
Am 05.06.2015 um 01:20 schrieb Christopher Dunn:

(Seen in git versions: 2.1.0 and 1.9.3 et al.)

$ git format-patch --stdout X^..X | git apply check -
fatal: unrecognized input

This fails when the commit consists of nothing but a submodule change
(as in 'git add submodule foo'), but it passes when a file change is
added to the same commit.

There used to be a similar problem for empty commits, but that was
fixed around git-1.8:


http://stackoverflow.com/questions/20775132/cannot-apply-git-patch-replacing-a-file-with-a-link

Now, 'git format-patch' outputs nothing for an empty commit. I suppose
that needs to be the behavior also when only submodules are changed,
since in that case there is no 'diff' section from 'format-patch'.

Use-case: git-p4

Of course, we do not plan to add the submodule into Perforce, but we
would like this particular command to behave the same whether there
are other diffs or not.


Hmm, I'm not sure that this is a bug. It looks to me like doing a

$ git format-patch --stdout X^..X | git apply check -

when nothing is changed except submodules and expecting it to work
is the cause of the problem.

I get the same error when I do:

$git format-patch --stdout master..master | git apply --check -
fatal: unrecognized input

No submodules involved, just an empty patch.

I assume you want to ignore all submodule changes, so you should
check if e.g. "git diff --ignore-submodules X^..X" returns anything
before applying that? (From the command you ran I assume you might
be able to drop the --ignore-submodules because you already did set
"diff.ignoreSubmodules" to "all"?)
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