# cvs2svn FAQ

General:

1. Does cvs2svn support incremental repository conversion?

Compatibility:

1. Does cvs2svn run under Psyco?

How-to:

1. How can I convert a CVS repository to which I only have remote access?
2. How can I convert my CVS repository one module at a time?
3. How can I convert part of a CVS repository?
4. How can I convert separate projects in my CVS repository into a single Subversion repository?
5. How can I convert project `foo` so that `trunk/tags/branches` are inside of `foo`?
6. How do I fix up end-of-line translation problems?
7. I want a single project but tag-rewriting rules that vary by subdirectory. Can this be done?
8. How can I convert a CVSNT repository?
9. How do I get cvs2svn to run on OS X 10.5.5?

Problems:

1. I get an error "A CVS repository cannot contain both repo/path/file.txt,v and repo/path/Attic/file.txt,v". What can I do?
2. gdbm.error: (45, 'Operation not supported')
3. When converting a CVS repository that was used on a Macintosh, some files have incorrect contents in SVN.
4. Using cvs2svn 1.3.x, I get an error "The command '['co', '-q', '-x,v', '-p1.1', '-kk', '/home/cvsroot/myfile,v']' failed" in pass 8.

Getting help:

1. How do I get help?
2. How do I report a bug?
3. How can I produce a useful test case?
4. Does anybody offer commercial support for cvs2svn/cvs2git conversions?

## General:

### Does cvs2svn support incremental repository conversion?

No.

Explanation: During the transition from CVS to Subversion, it would sometimes be useful to have the new Subversion repository track activity in the CVS repository for a period of time until the final switchover. This would require each conversion to determine what had changed in CVS since the last conversion, and add those commits on top of the Subversion repository.

Unfortunately, cvs2svn/cvs2git does not support incremental conversions. With some work it would be possible to add this feature, but it would be difficult to make it robust. The trickiest problem is that CVS allows changes to the repository that have retroactive effects (e.g., affecting parts of the history that have already been converted).

Some conversion tools claim to support incremental conversions from CVS, but as far as is known none of them are reliable.

Volunteers or sponsorship to add support for incremental conversions to cvs2svn/cvs2git would be welcome.

## Compatibility:

### Does cvs2svn run under Psyco?

No.

Explanation: Psyco is a python extension that can speed up the execution of Python code by compiling parts of it into i386 machine code. Unfortunately, Psyco is known not to run cvs2svn correctly (this was last tested with the Psyco pre-2.0 development branch). When cvs2svn is run under Psyco it crashes in `OutputPass` with an error message that looks something like this:

    cvs2svn_lib.common.InternalError: ID changed from 2 -> 3 for Trunk, r2

The Psyco team has been informed about the problem.

## How-to:

### How can I convert a CVS repository to which I only have remote access?

cvs2svn requires direct, filesystem access to a copy of the CVS repository that you want to convert. The reason for this requirement is that cvs2svn directly parses the `*,v` files that make up the CVS repository.

Many remote hosting sites provide access to backups of your CVS repository, which could be used for a cvs2svn conversion. For example:

- SourceForge allows CVS content to be accessed via rsync. In fact, they provide complete instructions for migrating a SourceForge project from CVS to SVN.
- ...(other examples welcome)

If your provider does not provide any way to download your CVS repository, there are two known tools that claim to be able to clone a CVS repository via the CVS protocol:

- cvsclone
- CVSsuck

It should be possible to use one of these tools to fetch a copy of your CVS repository from your provider, then to use cvs2svn to convert the copy. However, the developers of cvs2svn do not have any experience with these tools, so you are on your own here. If you try one of them, please tell us about your experience on the users mailing list.

### How can I convert my CVS repository one module at a time?

If you need to convert certain CVS modules (in one large repository) to Subversion now and other modules later, you may want to convert your repository one module at a time. This situation is typically encountered in large organizations where each project has a separate lifecycle and schedule, and a one-step conversion process is not practical.

First you have to decide whether you want to put your converted projects into a single Subversion repositories or multiple ones. This decision mostly depends on the degree of coupling between the projects and is beyond the scope of this FAQ. See the Subversion book for a discussion of repository organization.

If you decide to convert your projects into separate Subversion repositories, then please follow the instructions in How can I convert part of a CVS repository? once for each repository.

If you decide to put more than one CVS project into a single Subversion repository, then please follow the instructions in How can I convert separate projects in my CVS repository into a single Subversion repository?.

### How can I convert part of a CVS repository?

This is easy: simply run cvs2svn normally, passing it the path of the project subdirectory within the CVS repository. Since cvs2svn ignores any files outside of the path it is given, other projects within the CVS repository will be excluded from the conversion.

Example: You have a CVS repository at path `/path/cvsrepo` with projects in subdirectories `/path/cvsrepo/foo` and `/path/cvsrepo/bar`, and you want to create a new Subversion repository at `/path/foo-svn` that includes only the `foo` project:

        $ cvs2svn -s /path/foo-svn /path/cvsrepo/foo

### How can I convert separate projects in my CVS repository into a single Subversion repository?

cvs2svn supports multiproject conversions, but you have to use the options file method to start the conversion. In your options file, you simply call `run_options.add_project()` once for each sub-project in your repository. For example, if your CVS repository has the layout:

      /project_a
      /project_b

and you want your Subversion repository to be laid out like this:

       project_a/
          trunk/
             ...
          branches/
             ...
          tags/
             ...
       project_b/
          trunk/
             ...
          branches/
             ...
          tags/
             ...

then you need to have a section like this in your options file:

    run_options.add_project(
        'my/cvsrepo/project_a',
        trunk_path='project_a/trunk',
        branches_path='project_a/branches',
        tags_path='project_a/tags',
        symbol_transforms=[
            #...whatever...
            ],
        symbol_strategy_rules=[
            #...whatever...
            ],
        )
    run_options.add_project(
        'my/cvsrepo/project_b',
        trunk_path='project_b/trunk',
        branches_path='project_b/branches',
        tags_path='project_b/tags',
        symbol_transforms=[
            #...whatever...
            ],
        symbol_strategy_rules=[
            #...whatever...
            ],
        )

### How can I convert project `foo` so that `trunk/tags/branches` are inside of `foo`?

If `foo` is the only project that you want to convert, then either run cvs2svn like this:

       $ cvs2svn --trunk=foo/trunk --branches=foo/branches --tags=foo/tags CVSREPO/foo

or use an options file that defines a project like this:

    run_options.add_project(
        'my/cvsrepo/foo',
        trunk_path='foo/trunk',
        branches_path='foo/branches',
        tags_path='foo/tags',
        symbol_transforms=[
            #...whatever...
            ],
        symbol_strategy_rules=[
            #...whatever...
            ],
        )

If `foo` is not the only project that you want to convert, then you need to do a multiproject conversion; see How can I convert separate projects in my CVS repository into a single Subversion repository? for more information.

### How do I fix up end-of-line translation problems?

Warning: cvs2svn's handling of end-of-line options changed between version 1.5.x and version 2.0.x. This documentation applies to version 2.0.x and later. The documentation applying to an earlier version can be found in the `www` directory of that release of cvs2svn.

Starting with version 2.0, the default behavior of cvs2svn is to treat all files as binary except those explicitly determined to be text. (Previous versions treated files as text unless they were determined to be binary.) This behavior was changed because, generally speaking, it is safer to treat a text file as binary than vice versa.

However, it is often preferred to set `svn:eol-style=native` for text files, so that their end-of-file format is converted to that of the client platform when the file is checked out. This section describes how to get the settings that you want.

If a file is marked as binary in CVS (with `cvs admin -kb`, then cvs2svn will always treat the file as binary. For other files, cvs2svn has a number of options that can help choose the correct end-of-line translation parameters during the conversion:

`--auto-props=FILE` | Set arbitrary Subversion properties on files based on the auto-props section of a file in svn config format. The auto-props file might have content like this:
    [auto-props]
    *.txt = svn:mime-type=text/plain;svn:eol-style=native
    *.doc = svn:mime-type=application/msword;!svn:eol-style
This option can also be used in combination with `--eol-from-mime-type`. To force end-of-line translation off, use a setting of the form `!svn:eol-style` (with a leading exclamation point).
`--mime-types=FILE` | Specifies an Apache-style mime.types file for setting files' `svn:mime-type` property based on the file extension. The mime-types file might have content like this:
    text/plain              txt
    application/msword      doc
This option only has an effect on `svn:eol-style` if it is used in combination with `--eol-from-mime-type`.
`--eol-from-mime-type` | Set `svn:eol-style` based on the file's mime type (if known). If the mime type starts with "`text/`", then the file is treated as a text file; otherwise, it is treated as binary. This option is useful in combination with `--auto-props` or `--mime-types`.
`--default-eol=STYLE` | Usually cvs2svn treats a file as binary unless one of the other rules determines that it is not binary and it is not marked as binary in CVS. But if this option is specified, then cvs2svn uses the specified style as the default. STYLE can be 'binary' (default), 'native', 'CRLF', 'LF', or 'CR'. If you have been diligent about annotating binary files in CVS, or if you are confident that the above options will catch all of your binary files, then `--default-style=native` should give good results.

If you don't use any of these options, then cvs2svn will not arrange any line-end translation whatsoever. The file contents in the SVN repository should be the same as the contents you would get if checking out with CVS on the machine on which cvs2svn is run. This also means that the EOL characters of text files will be the same no matter where the SVN data are checked out (i.e., not translated to the checkout machine's EOL format).

To do a better job, you can use `--auto-props`, `--mime-types`, and `--eol-from-mime-type` to specify exactly which properties to set on each file based on its filename.

For total control over setting properties on files, you can use the `--options`-file method and write your own `SVNPropertySetter` in Python. For example,

    from cvs2svn_lib.property_setters import SVNPropertySetter

    class MyPropertySetter(SVNPropertySetter):
      def set_properties(self, s_item):
        if s_item.cvs_rev.cvs_file.cvs_path.startswith('path/to/funny/files/'):
          s_item.svn_props['svn:mime-type'] = 'text/plain'
          s_item.svn_props['svn:eol-style'] = 'CRLF'

    ctx.svn_property_setters.append(MyPropertySetter())

See the file `cvs2svn_lib/property_setters.py` for more examples.

### I want a single project but tag-rewriting rules that vary by subdirectory. Can this be done?

This is an example of how the cvs2svn conversion can be customized using Python.

Suppose you want to write symbol transform rules that are more complicated than "replace REGEXP with PATTERN". This can easily be done by adding just a little bit of Python code to your options file.

When a symbol is encountered, cvs2svn iterates through the list of `SymbolTransform` objects defined for the project. For each one, it calls `symbol_transform.transform(cvs_file, symbol_name, revision)`. That method can return any legal symbol name, which will be used in the conversion instead of the original name.

To use this feature, you will have to use an options file to start the conversion. You then write a new SymbolTransform class that inherits from RegexpSymbolTransform but checks the path before deciding whether to transform the symbol. Add the following to your options file:

    from cvs2svn_lib.symbol_transform import RegexpSymbolTransform

    class MySymbolTransform(RegexpSymbolTransform):
        def __init__(self, path, pattern, replacement):
            """Transform only symbols that occur within the specified PATH."""

            self.path = path
            RegexpSymbolTransform.__init__(self, pattern, replacement)

        def transform(self, cvs_file, symbol_name, revision):
            # Is the file is within the path we are interested in?
            if cvs_file.cvs_path.startswith(path + '/'):
                # Yes -> Allow RegexpSymbolTransform to transform the symbol:
                return RegexpSymbolTransform.transform(
                        self, cvs_file, symbol_name, revision)
            else:
                # No -> Return the symbol unchanged:
                return symbol_name

    # Note that we use a Python loop to fill the list of symbol_transforms:
    symbol_transforms = []
    for subdir in ['project1', 'project2', 'project3']:
        symbol_transforms.append(
            MySymbolTransform(
                subdir,
                r'release-(\d+)_(\d+)',
                r'%s-release-\1.\2' % subdir))

    # Now register the project, using our own symbol transforms:
    run_options.add_project(
        'your_cvs_path',
        trunk_path='trunk',
        branches_path='branches',
        tags_path='tags',
        symbol_transforms=symbol_transforms))

This example causes any symbol under "project1" that looks like "release-3_12" to be transformed into a symbol named "project1-release-3.12", whereas if the same symbol appears under "project2" it will be transformed into "project2-release-3.12".

### How can I convert a CVSNT repository?

CVSNT is a version control system that started out by adding support for running CVS under Windows NT. Since then it has made numerous extensions to the RCS file format, to the point where CVS compatibility does not imply CVSNT compatibility with any degree of certainty.

cvs2svn might happen to successfully convert a CVSNT repository, especially if the repository has never had any CVSNT-only features used on it, but this use is not supported and should not be expected to work.

If you want to experiment with converting a CVSNT repository, then please consider the following suggestions:

- Use cvs2svn's `--use-cvs` option.
- Use CVSNT's version of the `cvs` executable (i.e., ensure that the first `cvs` program in your $PATH is the one that came with CVSNT).
- Carefully check the result of the conversion before you rely on it, even if the conversion completed without any errors or warnings.

Patches to support the conversion of CVSNT repositories would, of course, be welcome.

### How do I get cvs2svn to run on OS X 10.5.5?

Attempting to run cvs2svn on a standard OS X 10.5.5 installation yields the following error:

> ERROR: cvs2svn uses the anydbm package, which depends on lower level dbm libraries. Your system has dbm, with which cvs2svn is known to have problems. To use cvs2svn, you must install a Python dbm library other than dumbdbm or dbm. See http://python.org/doc/current/lib/module-anydbm.html for more information.

The problem is that the standard distribution of python on OS X 10.5.5 does not include any other dbm libraries other than the standard dbm. In order for cvs2svn to work, we need to install the gdbm library, in addition to a new version of python that enables the python gdbm module.

The precompiled versions of python for OS X available from python.org or activestate.com (currently version 2.6.2) do not have gdbm support turned on. To check for gdbm support, check for the library module (`libgdmmodule.so`) within the python installation.

Here is the procedure for a successful installation of cvs2svn and all supporting libs:

1. Download the gdbm-1.8.3 (or greater) source, unarchive and change directory to gdbm-1.8.3. We need to install the gdbm libraries so python's gdbm module can use them.
   1. Type `./configure`
   2. Edit "Makefile" so that the owner and group are not the non-existing "bin" owner and group by changing

          BINOWN = bin
          BINGRP = bin

      to

          BINOWN = root
          BINGRP = admin

   3. Type "make"
   4. Type "sudo make install"
2. Download the Python2.6 (or greater) source, unarchive, and change directory to Python2.6. We need to enable python gdbm support which is not enabled in the default OS X 10.5.5 installation of python, as the gdbm libs are not included. However, we just installed the gdbm libs in step 1, so we can now compile python with gdbm support.
   1. Edit the file "Modules/Setup" by uncommenting the line which links against gdbm by changing

          #gdbm gdbmmodule.c -I/usr/local/include -L/usr/local/lib -lgdbm

      to

          gdbm gdbmmodule.c -I/usr/local/include -L/usr/local/lib -lgdbm

   2. Edit the file "Modules/Setup" by uncommenting the line to create shared libs by changing

          #*shared*

      to

          *shared*

   3. Type `./configure --enable-framework --enable-universalsdk` in the top-level Python2.6 directory. This will configure the installation of python as a shared OS X framework, and usable with OS X GUI frameworks and SDKs. You may have problems building if you don't have the SDKs that support the PPC platform. If you do, just specify `--disable-universalsdk`. By default, python will be installed in "/Library/Frameworks/Python.framework", which is what we want.
   4. Type `make`
   5. Type `sudo make install`
   6. Type `cd /usr/local/bin; sudo ln -s python2.6 python`
   7. Make sure "/usr/local/bin" is at the front of your search path in ~/.profile or ~/.bashrc etc.
   8. Type `source ~/.profle` or `source ~/.bashrc` etc. or alternatively, just open a new shell window. When you type `which python` it should give you the new version in "/usr/local/bin" not the one in "/usr/bin".
3. Download the cvs2svn-2.2.0 (or greater) source, unarchive and change directory to cvs2svn-2.2.0. Many people can't get cvs2svn to work except in the installation directory. The reason for this is that the installation places copies of cvs2svn, cvs2svn_libs, and cvs2svn_rcsparse in the /Library/Frameworks/Python.framework hierarchy. All we need to do is make a link in /usr/local/bin pointing to the location of cvs2svn in the python framework hierarchy. And for good measure we also make links to the lib and include directories:
   1. Type `sudo make install`
   2. Create the required links by typing the following:

          sudo ln -s /Library/Frameworks/Python.framework/Versions/2.6/bin/cvs2svn /usr/local/bin/cvs2svn
          sudo ln -s /Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6 /usr/local/lib/python2.6
          sudo ln -s /Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 /usr/local/include/python2.6

The installation is complete. Change directory out of the cvs2svn-2.2.0 installation directory, and you should be able to run cvs2svn. Be careful *not* to copy the version of cvs2svn in the cvs2svn-2.2.0 installation directory to /usr/local/bin, as this has a different python environment setting at the top of the file than the one that was installed in the /Library/Frameworks/Python.framework hierarchy. Follow the instructions exactly, and it should work.

## Problems:

### I get an error "A CVS repository cannot contain both repo/path/file.txt,v and repo/path/Attic/file.txt,v". What can I do?

Background: Normally, if you have a file called `path/file.txt` in your project, CVS stores its history in a file called `repo/path/file.txt,v`. But if `file.txt` is deleted on the main line of development, CVS moves its history file to a special `Attic` subdirectory: `repo/path/Attic/file.txt,v`. (If the file is recreated, then it is moved back out of the `Attic` subdirectory.) Your repository should never contain both of these files at the same time.

This cvs2svn error message thus indicates a mild form of corruption in your CVS repository. The file has two conflicting histories, and even CVS does not know the correct history of `path/file.txt`. The corruption was probably created by using tools other than CVS to backup or manipulate the files in your repository. With a little work you can learn more about the two histories by viewing each of the `file.txt,v` files in a text editor.

There are four straightforward approaches to fixing the repository corruption, but each has potential disadvantages. Remember to make a backup before starting. Never run cvs2svn on a live CVS repository--always work on a copy of your repository.

1. Restart the conversion with the `--retain-conflicting-attic-files` option. This causes the non-attic and attic versions of the file to be converted separately, with the `Attic` version stored to a new subdirectory as `path/Attic/file.txt`. This approach avoids losing any history, but by moving the `Attic` version of the file to a different subdirectory it might cause historical revisions to be broken.
2. Remove the `Attic` version of the file and restart the conversion. Sometimes it represents an old version of the file that was deleted long ago, and it won't be missed. But this completely discards one of the file's histories, probably causing `file.txt` to be missing in older historical revisions. (For what it's worth, this is probably how CVS would behave in this situation.)

             # You did make a backup, right?
             $ rm repo/path/Attic/file.txt,v

3. Remove the non-`Attic` version of the file and restart the conversion. This might be appropriate if the non-`Attic` version has less important content than the `Attic` version. But this completely discards one of the file's histories, probably causing `file.txt` to be missing in recent historical revisions.

             # You did make a backup, right?
             $ rm repo/path/file.txt,v

4. Rename the non-`Attic` version of the file and restart the conversion. This avoids losing history, but it changes the name of the non-`Attic` version of the file to `file-not-from-Attic.txt` whenever it appeared, and might thereby cause revisions to be broken.

             # You did make a backup, right?
             $ mv repo/path/file.txt,v repo/path/file-not-from-Attic.txt,v

If you run cvs2svn on a case-insensitive operating system, it is possible to get this error even if the filename of the file in Attic has different case than the one out of the Attic. This could happen, for example, if the CVS repository was served from a case-sensitive operating system at some time. A workaround for this problem is to copy the CVS repository to a case-sensitive operating system and convert it there.

### gdbm.error: (45, 'Operation not supported')

This has been reported to be caused by trying to create gdbm databases on an NFS partition. Apparently gdbm does not support databases on NFS partitions. The workaround is to use the `--tmpdir` option to choose a local partition for cvs2svn to write its temporary files.

### When converting a CVS repository that was used on a Macintosh, the contents of some files are incorrect in SVN.

Some Macintosh CVS clients use a nonstandard trick to store the resource fork of files in CVS: instead of storing the file contents directly, store an AppleSingle data stream containing both the data fork and resource fork. When checking the file out, the client unpacks the AppleSingle data and writes the two forks separately to disk. By default, cvs2svn treats the file contents literally, so when you check the file out of Subversion, the file contains the combined data in AppleSingle format rather than only the data fork of the file as expected.

Subversion does not have any special facilities for dealing with Macintosh resource forks, so there is nothing cvs2svn can do to preserve both forks of your data. However, sometimes the resource fork is not needed. If you would like to discard the resource fork and only record the data fork in Subversion, then start your conversion using the options file method and set the following option to `True` in your options file:

          ctx.decode_apple_single = True

There is more information about this option in the comments in `cvs2svn-example.options`.

### Using cvs2svn 1.3.x, I get an error "The command '['co', '-q', '-x,v', '-p1.1', '-kk', '/home/cvsroot/myfile,v']' failed" in pass 8.

What are you using cvs2svn version 1.3.x for anyway? Upgrade!

But if you must, either install RCS, or ensure that CVS is installed and use cvs2svn's `--use-cvs` option.

## Getting help:

### How do I get help?

There are several sources of help for cvs2svn:

- The user manual not only describes how to run cvs2svn, but also discusses some limitations, pitfalls, and conversion strategies. Please note that the online manual describes the latest "bleeding edge" trunk version of the software, which may be different than the version that you are using.
- The frequently asked questions (FAQ) list is the document that you are now reading. Please make sure you've scanned through the list of topics to see if your question is already answered.
- The mailing list archives. Maybe your question has been discussed on either the `user@cvs2svn.tigris.org` or `dev@cvs2svn.tigris.org` mailing list.
- If you need help with running cvs2svn or problems converting your repository, the `users@cvs2svn.tigris.org` mailing list is the first place to send inquiries. Please subscribe to the list so that you can follow ensuing discussions.
- You can also ask questions on IRC at `irc.freenode.net`, channel `#cvs2svn`.
- If you think you have found a bug, please refer to "How do I report a bug?"

### How do I report a bug?

cvs2svn is an open source project that is largely developed and supported by volunteers in their free time. Therefore please try to help out by reporting bugs in a way that will enable us to help you efficiently.

The first question is whether the problem you are experiencing is caused by a cvs2svn bug at all. A large fraction of reported "bugs" are caused by problems with the user's CVS repository, especially mild forms of repository corruption or trying to convert a CVSNT repository with cvs2svn. Please also double-check the manual to be sure that you are using the command-line options correctly.

A good way to localize potential repository corruption is to use the `shrink_test_case.py` script (which is located in the `contrib` directory of the cvs2svn source tree). This script tries to find the minimum subset of files in your repository that still shows the same problem. Warning: Only apply this script to a backup copy of your repository, as it destroys the repository that it operates on! Often this script can narrow the problem down to a single file which, as often as not, is corrupt in some way. Even if the problem is not in your repository, the shrunk-down test case will be useful for reporting the bug. Please see "How can I produce a useful test case?" and the comments at the top of `shrink_test_case.py` for information about how to use this script.

Assuming that you still think you have found a bug, the next step is to investigate whether the bug is already known. Please look through the issue tracker for bugs that sound familiar. If the bug is already known, then there is no need to report it (though possibly you could contribute a useful test case or a workaround).

If your bug seems new, then the best thing to do is report it via email to the dev@cvs2svn.tigris.org mailing list. Be sure to include the following information in your message:

1. Exactly what version of cvs2svn are you using? If you are not using an official release, please tell us what branch and revision number from the svn archive you are using. If you have modified cvs2svn, please tell us exactly what you have changed.
2. What platform are you using (Linux, BSD, Windows, etc.)? What python version (e.g., type `python --version`)?
3. What is the exact command line that you used to start the conversion? If you used the `--options` option, please attach a copy of the options file that you used.
4. What happened when you ran the program? Why do you think the behavior was wrong? Include transcripts and/or error output if available.
5. If at all possible, include a test case repository that we can use to reproduce the problem. See "How can I produce a useful test case?" for more information. In most cases, if we cannot reproduce the problem, there is nothing we can do to help you.

### How can I produce a useful test case?

If you need to report a bug, it is extremely helpful if you can include a test repository with your bug report. In most cases, if we cannot reproduce the problem, there is nothing we can do to help you. This section describes ways to overcome the most common problems that people have in producing a useful test case. When you have a reasonable-sized test case (say under 1 MB--the smaller the better), you can just tar it up and attach it to the email in which you report the bug.

#### If the repository is too big and/or contains proprietary information

You don't want to send us your proprietary information, and we don't want to receive it either. Short of open-sourcing your software, here is a way to strip out most of the proprietary information and simultaneously reduce the size of the archive tremendously.

The `destroy_repository.py` script tries to delete as much information as possible out of your repository while still preserving its basic structure (and therefore hopefully any cvs2svn bugs). Specifically, it tries to delete file descriptions, text content, all nontrivial log messages, and all author names. It also renames all files and directories to have generic names (e.g., `dir015/file053,v`). (It does not affect the number and dates of revisions to the files.)

1. This procedure will destroy the repository that it is applied to, so be sure to make a backup copy of your repository and work with the backup!
2. Make sure you have the `destroy_repository.py` script. If you don't already have it, you should download the source code for cvs2svn (there is no need to install it). The script is located in the `contrib` subdirectory.
3. Run `destroy_repository.py` by typing

       # You did make a backup, right?
       /path/to/config/destroy_repository.py /path/to/copy/of/repo

4. Verify that the "destroyed" archive does not include any information that you consider proprietary. Your data security is ultimately your responsibility, and we make no guarantees that the `destroy_repository.py` script works correctly. You can open the *,v files using a text editor to see what they contain.
5. Try converting the "destroyed" repository using cvs2svn, and ensure that the bug still exists. Take a note of the exact cvs2svn command line that you used and include it along with a tarball of the "destroyed" repository with your bug report.

If running `destroy_repository.py` with its default options causes the bug to go away, consider using `destroy_repository.py` command-line options to leave part of the repository information intact. Run `destroy_repository.py --help` for more information.

#### The repository is still too large

This step is a tiny bit more work, so if your repository is already small enough to send you can skip this step. But this step helps narrow down the problem (maybe even point you to a corrupt file in your repository!) so it is still recommended.

The `shrink_test_case.py` script tries to delete as many files and directories from your repository as possible while preserving the cvs2svn bug. To use this command, you need to write a little test script that tries to convert your repository and checks whether the bug is still present. The script should exit successfully (e.g., "`exit 0`") if the bug is still present, and fail (e.g., "`exit 1`") if the bug has disappeared. The form of the test script depends on the bug that you saw, but it can be as simple as something like this:

    #! /bin/sh

    cvs2svn --dry-run /path/to/copy/of/repo 2>&1 | grep -q 'KeyError'

If the bug is more subtle, then the test script obviously needs to be more involved.

Once the test script is ready, you can shrink your repository via the following steps:

1. This procedure will destroy the repository that it is applied to, so be sure to make a backup copy of your repository and work with the backup!
2. Make sure you have the `shrink_test_case.py` script. If you don't already have it, you should download the source code for cvs2svn (there is no need to install it). The script is located in the `contrib` subdirectory.
3. Run `shrink_test_case.py` by typing

       # You did make a backup, right?
       /path/to/config/shrink_test_case.py /path/to/copy/of/repo testscript.sh

   , where `testscript.sh` is the name of the test script described above. This script will execute `testscript.sh` many times, each time using a subset of the original repository.
4. If the shrunken repository only consists of one or two files, look inside the files with a text editor to see whether they are corrupted in any obvious way. (Many so-called cvs2svn "bugs" are actually the result of a corrupt CVS repository.)
5. Try converting the "shrunk" repository using cvs2svn, to make sure that the original bug still exists. Take a note of the exact cvs2svn command line that you used, and include it along with a tarball of the "destroyed" repository with your bug report.

### Does anybody offer commercial support for cvs2svn/cvs2git conversions?

Disclaimer:These links in this section are provided as a service to cvs2svn/cvs2git users. Neither Tigris.org, CollabNet Inc., nor the cvs2svn team guarantee the correctness, validity or usefulness of these links. To add a link to this section, please submit it to the cvs2svn developers' mailing list.

Following is a list of known sources for commercial support for cvs2svn/cvs2git conversions:

- Michael Haggerty, the maintainer of cvs2svn/cvs2git, offers individual help with conversions, including implementation of new cvs2svn/cvs2git features, on a consulting basis. Please contact Michael via email for more information.