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Re: Bug diff 2.8.7: Separate dir
On Fri, 4 Mar 2005, Brian Dessent wrote:
> Arend-Jan Westhoff wrote:
> >
> > Noticed that when diff is run with two differing files,
> > one with and one without a directory specifier:
> > diff a someDir\b
> > then all lines are reported as different.
> > Whereas when both have a directory specifier:
> > diff .\a someDir\b
> > output is normal.
> > (Filenames, argument order or using -d seem irrelevant.
> > Using / instead of \ makes output normal also:
> > diff a someDir/b
> > output is normal.
> > Similarly when comparing a and someDir\a as:
> > diff a someDir
> > output is also normal.
> > )
>
> I cannot reproduce this, either from a bash prompt or from cmd using
> your .bat file:
I can reproduce this (even under bash). All you need is a textmode mount
and files with CRLF line endings.
> It's probably a textmode/binmode issue, though I don't know why
> switching between '\' and '/' as the path seperator changes it --
> although the Cygwin path handling code is complex and I can't pretend to
> understand it.
Having a '\' in a filename bypasses Cygwin's mounts and uses regular
Windows mechanisms for opening the file. Reading a file on a textmode
mount will translate CRLF line endings to normal LFs. No wonder 'diff' is
confused.
> There was no attached cygcheck so I don't know how your mounts are setup
> but from what I've read, using textmode mounts with tools like cvs and
> diff is a recipe for disaster.
Yep. One possible workaround is to use the '--strip-trailing-cr' option
to diff, which will make it insensitive to textmode/binmode line endings.
Igor
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