Re: [BUG] Error while trying to git apply a patch; works with patch -p1

["SZEDER Gábor" <szeder.dev@gmail.com>]

On Fri, Oct 05, 2018 at 09:17:54AM -0300, Eneas Queiroz wrote:
> Em qui, 4 de out de 2018 às 18:45, SZEDER Gábor <szeder.dev@gmail.com> escreveu:
> >
> > On Thu, Oct 04, 2018 at 06:01:11PM -0300, Eneas Queiroz wrote:
> > > I've sent this to the list 2 days ago, but I can't find it in the list
> > > archives, so I'm sending it again without files attached.  I apologize
> > > if this is a duplicate. One should be able to reproduce this with the
> > > current PR files, but if not, I can provide them.
> > >
> > > I've hit a strange error while trying to apply a patch from github
> > > here: https://github.com/openwrt/openwrt/pull/965
> > >
> > > 965.patch:452: trailing whitespace.
> > >
> > > 965.patch:559: space before tab in indent.
> > >              -o $(SHLIBNAME_FULL) \
> > > 965.patch:560: space before tab in indent.
> > >              $$ALLSYMSFLAGS $$SHOBJECTS $$NOALLSYMSFLAGS $$LIBDEPS; \
> > > 965.patch:564: space before tab in indent.
> > >         -o $(SHLIBNAME_FULL) \
> > > 965.patch:2334: trailing whitespace.
> > >
> > > error: package/libs/openssl/patches/100-Configure-afalg-support.patch:
> > > No such file or directory
> > > error: package/libs/openssl/patches/110-openwrt_targets.patch: No such
> > > file or directory
> > > error: package/libs/openssl/patches/120-fix_link_segfault.patch: No
> > > such file or directory
> > > error: package/libs/openssl/patches/1.1.0/100-Configure-afalg-support.patch:
> > > No such file or directory
> > > error: package/libs/openssl/patches/1.1.0/110-openwrt_targets.patch:
> > > No such file or directory
> > >
> > > If you get the patch file from
> > > https://github.com/openwrt/openwrt/pull/965.patch and apply it with
> > > git apply, it fails.  If I apply the same file with patch -p1, it
> > > works fine.  I've tried it with git 2.16.4 and 2.19, and they both
> > > fail with the same error, and at least 2 more people have confirmed
> > > it.
> > >
> > > git apply fails even when using git format-patch -13 --stdout as a
> > > source, so it is not github doing something weird.
> > >
> > > The file is a series of 13 patches.  If I split the series after the
> >
> > So this is no _a_ patch, then, but a mailbox of patches.  'git apply'
> > is supposed to apply a single a patch; apparently 'patch' is more
> > lenient.
> >
> > Have you tried 'git am'?
> >
> > > 3rd patch, it works.
> > > Also, if I use https://github.com/openwrt/openwrt/pull/965.diff, it also works.
> > >
> > > I'm not subscribed to the list, so please CC me.
> > >
> > > Cheers,
> > >
> > > Eneas
> 
> Thanks for the reply.  Is that expected behavior?  git apply seems to
> work in most similar cases.

Oh, I'm surprised by that; but I rarely use 'git apply' directly, as I
apply even single patches with 'git am'.

> git am works fine--although it complains a lot about whitespace errors
> when patching *.patch output files.
> 
> I know they're just warnings, but perhaps git apply/am should suppress
> them when creating/patching a *.patch file, since context lines in
> '*.patch' files all start with a space.

'git am' and 'git apply' don't know or care about filetypes, and
neither does the rest of Git for that matter, unless you explicitly
tell them to.  With a proper .gitattributes entry you can tell them to
ignore all or only specific types of whitespace errors in '*.patch'
files, e.g.:

  *.patch -whitespace

or

  *.patch whitespace=-space-before-tab,-blank-at-eol