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epatch for multifile patches


From: Arseny Sher
Subject: epatch for multifile patches
Date: Wed, 08 Mar 2017 14:57:05 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

Hello,

I am having trouble using epatch while applying multifile patches.
Consider the following simple example:

address@hidden ~/tmp $ mkdir -p old/src
address@hidden ~/tmp $ echo "void main() { }" > old/src/hello.c
address@hidden ~/tmp $ mkdir -p new/src
address@hidden ~/tmp $ echo "int main() { return 0; }" > new/src/hello.c
address@hidden ~/tmp $ diff -cr old/ new/ > tmp.patch
address@hidden ~/tmp $ cat tmp.patch
diff -cr old/src/hello.c new/src/hello.c
*** old/src/hello.c     2017-03-08 14:29:24.743846995 +0300
--- new/src/hello.c     2017-03-08 14:29:32.399846824 +0300
***************
*** 1 ****
! void main() { }
--- 1 ----
! int main() { return 0; }


Now I start emacs and do M-x epatch. First of all, it asks me for
patch buffer or file, I point to '~/tmp/tmp.patch'. Then it asks for
directory to patch, I say '~/tmp/old' and ediff complains

Ediff has inferred that
        /home/ars/tmp/old/hello.c
is assumed to be the target for this patch.  However, this file does not exist.

Please enter an alternative patch target ...


because it ignores the path ('src' directory in this case) to the file.
Ediff manual says: "Ediff can recognize multi-file patches only if they
are in the context format or GNU unified format. All other patches are
treated as 1-file patches. Ediff is [hopefully] using the same algorithm
as patch to determine which files need to be patched." So, if I
understood it correctly, this should work. Is it a bug or what?

I tried it on GNU Emacs versions 25.1, 25.2 RC2 and daily build
26.0.50.2, the result is the same.



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