(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.
~Christopher Dunn (cdunn2001)
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