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From Bo Berglund <bo.bergl...@gmail.com>
Subject Re: Exe files corrupted in SVN after import from CVS
Date Mon, 22 Jan 2018 07:42:22 GMT
On Sun, 21 Jan 2018 22:23:21 -0600, Ryan Schmidt
<subversion-2018@ryandesign.com> wrote:

>
>On Jan 20, 2018, at 10:25, Bo Berglund wrote:
>
>> I have found that there is a problem in our SVN repository, which was
>> converted from CVS using cvs2svn 2.5.0.
>> 
>> It concerns two exe files which are corrupted when I check out or
>> export them. The trunk files have been expanded by 905 bytes or shrunk
>> by 119 bytes in the two cases. Both are in the same project. They have
>> 82 and 67 commits into them respectively.
>
>Did you or your conversion process set the svn:eol-style property on 
>these files? If so, that's why they got corrupted; you mustn't set 
>that property on binary files.

Well, most of the exe files got converted without this problem, so it
could not really be a global mistake in the way file properties are
set.

This is how I configured individual conversions, the remaining options
file content stayed the same for all repos:

outdumpfile='pc-dump'
inputreponame='PC'

This is my options settings for the cvs2svn conversion regarding
properties, mostly defaults in the options file example from cvs2svn):

ctx.file_property_setters.extend([
    CVSBinaryFileEOLStyleSetter(),
    CVSBinaryFileDefaultMimeTypeSetter(),
    DefaultEOLStyleSetter(None),
    SVNBinaryFileKeywordsPropertySetter(),
    KeywordsPropertySetter(config.SVN_KEYWORDS_VALUE),
    ExecutablePropertySetter(),
    DescriptionPropertySetter(propname='cvs:description'),
    SVNKeywordHandlingPropertySetter(),
    SVNEOLFixPropertySetter(),
    ])
ctx.revision_property_setters.extend([
    ])

and this is how the CVS top level directories were treated as
"projects" during conversion:

# 1)List all projects automatically
import os
cvs_repo_main_dir = '/home/bosse/CVSREPOS/' + inputreponame
projects = os.listdir(cvs_repo_main_dir)

# 2) Probably you don't want to convert CVSROOT:
projects.remove('CVSROOT')

# 3) Now loop projects and add to conversion list
for project in projects:
    run_options.add_project(
        cvs_repo_main_dir + '/' + project,
        trunk_path=(project + '/trunk'),
        branches_path=(project + '/branches'),
        tags_path=(project + '/tags'),
        symbol_strategy_rules=global_symbol_strategy_rules,
        )

So, the options file stayed the same for all 8 CVS repositories except
regarding the definition of the repo to convert and the output dump
file name. Also I have not (yet) found any more corrupted exe files
than these two that were compiled using Borland C++Builder and had CVS
revision files with a huge size of 487Mb and 367Mb respectively.

Therefore I suspect that either the RCS file size itself caused a
problem for cvs2svn, or there is some kind of internal exe file byte
pattern in such files that triggers an action in cvs2svn which causes
the file corruption...

The Ubuntu 16.04 Server (virtual machine) on which I ran the
conversion has a RAM allotment of 2 GB, maybe this is too little when
dealing with these huge files?

Checking out these files from CVS, even very old revisions from say
2006, still works successfully.


-- 
Bo Berglund
Developer in Sweden


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