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Re: handling binary file

From: Ming Zhang <mingz_at_ele.uri.edu>
Date: 2006-07-27 23:04:48 CEST

On Thu, 2006-07-27 at 23:02 +0200, Erik Huelsmann wrote:
> On 7/27/06, Ming Zhang <mingz@ele.uri.edu> wrote:
> > On Thu, 2006-07-27 at 22:47 +0200, Ryan Schmidt wrote:
> > > On Jul 27, 2006, at 19:58, Ming Zhang wrote:
> > >
> > > > I met a strange problem. I migrate my code tree from sf.net (CVS) to
> > > > berlios (SVN). Then I found I have almost all binary files are broken.
> > > > And seems svn can not even detect this. I feel SVN treat all these
> > > > binary files as textual files.
> > >
> > > Are you sure the files aren't already broken in CVS? I haven't used
> > > CVS, but I understand it's easy to corrupt binary files in CVS by
> > > forgetting to tell CVS that they're binary.
> >
> > i just check out from cvs and these files are ok.
> >
> > >
> > > Subversion treats all files as binary and won't muck with them unless
> > > you tell it to. For example, if you tell it to do line-ending
> > > conversion (svn:eol-style property) or keyword expansion
> > > (svn:keywords property) it will do this, even on binary files; this
> > > will probably destroy most kinds of binary files, so you should not
> > > ask Subversion to do these kinds of operations on binary files.
> >
> > i never did this. in fact, i just know this today by googling because of
> > this problem. :P
> >
> > >
> > > There's also the matter of the MIME type (svn:mime-type property).
> > > Have you set the MIME type of these files to a text/* MIME type or a
> > > binary MIME type? A good MIME type for PDF files for example would be
> > > application/pdf.
> > >
> > >
> > > > For example, I have this pdf file Iometer.pdf.
> > > >
> > > > $ ll
> > > > total 1052
> > > > drwxrwxr-x 4 mingz mingz 4096 May 3 11:02 Docbook
> > > > drwxrwxr-x 3 mingz mingz 4096 May 3 11:02 Iometer_Files
> > > > -rw-rw-r-- 1 mingz mingz 988246 May 3 11:02 Iometer.pdf
> > > > -rw-rw-r-- 1 mingz mingz 68529 May 3 11:02 Iometer.sxw
> > > >
> > > > Then I copy the correct file to overwrite it.
> > > >
> > > > $ cp ../../../branches/IOMETER-restruct/iometer/Docs/Iometer.pdf .
> > > >
> > > > See the file size changed.
> > > >
> > > > $ ll
> > > > total 1056
> > > > drwxrwxr-x 4 mingz mingz 4096 May 3 11:02 Docbook
> > > > drwxrwxr-x 3 mingz mingz 4096 May 3 11:02 Iometer_Files
> > > > -rw-rw-r-- 1 mingz mingz 992633 Jul 27 13:53 Iometer.pdf
> > > > -rw-rw-r-- 1 mingz mingz 68529 May 3 11:02 Iometer.sxw
> > > >
> > > > But svn can not detect the file is changed.
> > > >
> > > > $ svn st
> > > >
> > > > How to correct this and let svn treat them as binary?
> > >
> > > That seems also to point towards improper svn:eol-style or
> > > svn:keywords properties being used. What do you see if you say "svn
> > > proplist -v Iometer.pdf"?
> > >
> >
> > $ svn proplist -v Iometer.pdf
> > Properties on 'Iometer.pdf':
> > svn:keywords : Author Date Id Revision
> > svn:eol-style : native
>
> > i have this. i guess native is a default good choice?
>
> Well, not in this case: you explicitly asked Subversion to treat your
> binary file as texty... You could remove both properties and then copy

could you explain a bit more on this?

> the undamaged file in. Maybe that helps? Also, the date on the file
> needs to be newer than the date on the file when it is restored
> through revert.

ok. i will try this.

>
> HTH,
>
> Erik.

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Received on Thu Jul 27 23:07:36 2006

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