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When a git-syle patch is applied, all file modifications are done to
temporary files which are put in place when the patch ends. When a
patch fails, GNU patch was trying to "roll back" to the start. A bug in
that code that lead to accidental file deletion was recently discovered
by Richard Weinberger <richard@nod.at>. Even worse though, GNU patch
should not exhibit this "rollback" behavior in the first place; that's
not what people expect. Instead, the files modified so far should be put
in place.
* src/patch.c (cleanup): Put output files processed successfully
in place instead of trying to "roll back" to the start.
(forget_output_files): Remove obsolete (and broken) function.
* tests/git-cleanup: New broken git-style patch test case that exercises
the cleanup path.
* tests/Makefile.am (TESTS): Add new test case.
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