[[PageOutline(2-3)]] = Trac and Subversion = Trac has supported the [http://subversion.apache.org Subversion] VersionControlSystem since day one. Actually, Trac was even named `svntrac` back then! However, things change and other version control systems gain in popularity... in Trac 1.0 we also support Git as an optional component below `tracopt.versioncontrol.git.*`. As to not make any first class, second class distinction, we also decided to move the subversion support over there, in `tracopt.versioncontrol.svn.*`. {{{#!box info [=#tracopt] In Trac 1.0 (trunk, starting from r11082), the components for Subversion support have been moved below `tracopt.` so you need to explicitly enable them in your TracIni#components-section: {{{ [components] tracopt.versioncontrol.svn.* = enabled }}} This can instead be enabled using the Admin -> General -> Plugins (Manage Plugins) select component the checkbox(es). }}} This page is intended to collect all the specific tips and tricks about Subversion support ''in Trac''. This is not the place for general Subversion help. You can get [wiki:TracSubversion#AskingforMoreSupportAboutSubversion more support] options elsewhere. == Getting Subversion == From subversion.apache.org: - [http://subversion.apache.org/source-code.html Source Code] - [http://subversion.apache.org/packages.html Subversion Binary Packages] === Debian Linux === Install the Subversion Bindings using `apt`: {{{ apt-get install python-subversion }}} Works for Subversion >= 1.4. === !RedHat/Fedora/CentOS Linux === Install the Subversion bindings using `yum`: {{{ sudo yum install svn subversion-python }}} === Windows (x64) Don't use 64bit version of Python. The Subversion project does not provide amd64 or ia64 setup executables, so if you want to use Subversion integration, you’ll need to either compile the bindings yourself, or use the x86 version of Python even if OS is 64bit. === Windows (x86) ==== for Python 2.5 One easy way to get Python 2.5 bindings is to install Collabnet Subversion Edge [http://www.open.collab.net/go/csvne2_r2a/]. The bindings can be found in the \csvn\lib\svn-python directory. ==== for ActivePython 2.5 One way to get the bindings is to install the [http://www.open.collab.net/downloads/subversion/ CollabNet Subversion Server]. While installing ("Apache Configuration" page / "mod_dav_svn Configuration") you have to select the "Enable viewVC" option. The installer then goes to the "ViewVC Configuration" page and asks for the location of the "Active Python Directory". Be sure to prepend the directory containing the Subversion libraries, from the server install (e.g. `C:\Program Files (x86)\CollabNet\Subversion Server`) to the `PATH`, or the bindings won't load. ==== for Python 2.6 The other way is to get them from http://alagazam.net: you'll need the Windows installer `Setup-Subversion-1.x.y.msi` (or the Windows binaries `svn-win32-1.x.y.zip`) and the Python 2.6 bindings `svn-win32-1.x.y_py.zip`. The Alagazam installer updates the PATH automatically to point to the new binary directory. The python-bindings zip file has a folder structure of {{{ svn-win32- python libsvn svn }}} The `libsvn` and `svn` folders should be extracted into the `Python26\Lib\site-packages` directory. For Subversion 1.6 bindings then rename the binding DLLs: change `libsvn/_*.dll` to `libsvn/_*.pyd` (don't change the name of `libsvn_swig_py-1.dll`), the 1.7.x bindings already have the correct names. * Note: if !CollabNet is providing SWIG bindings for Python 2.6, I can't find them. * Also note: the Subversion directory structure of the Alagazam distro is slightly different than the !CollabNet one: all the executables are in the `bin` subdirectory. If you end up with the infamous //`ImportError: DLL load failed: ...`//, don't despair but have a look at the [#checklist-windows Windows troubleshooting] section below. ==== for Python 2.7 For Subversion 1.7.x there are also bindings available from http://alagazam.net (see Python 2.6 section above). An alternative is to use the Subversion 1.7.0 bindings from !CollabNet server edition: [http://www.open.collab.net/products/subversion/getit.html CollabNet Subversion Edge 2.1.0 (for Windows 32 or 64 bit)]. You'll find there a full Python 2.7.1 installation (below the `Python25` top-level folder!) and the corresponding bindings below `lib/svn-python`. It seems that even though that Python installation was built with !VisualStudio 2010 (`msvcr100.dll`), you can also use those svn bindings with the Python from python.org which was built with !VisualStudio 2008 (`msvcr90.dll`). I'm a bit disappointed, where's the DLL hell gone? //For the 1.6.x bidings, there's no "official" release to be found for Python 2.7, but thanks to dawuid, who contributed [attachment:svn-win32-1.6.15_py_2.7.zip] (md5 `9dba3d11c4bbb91e29deb28f569e821b`). I tested them, and they seem to work great. Simply unzip in your \Lib\site-packages folder. Note that you must have the folder containing the matching Subversion libraries in your PATH (e.g. "C:\Program Files (x86)\Subversion\bin"). === BSDs On the various BSDs use ports or pkgsrc to install Subversion complete with Python bindings. For FreeBSD see use `/usr/ports/devel/py-subversion`. For pkgsrc use the `devel/py*-subversion` package for getting the bindings. == Building Subversion == The point is not to repeat the excellent build instructions found elsewhere, but rather to clarify the general approach: Trac actually needs the SWIG bindings for Subversion that are bundled with the Subversion distribution. In order to build them, you (obviously) need to build first Subversion, then the bindings. * Read the `INSTALL` file that sits at top level of the Subversion source distribution * Do `./configure ...; make; make install`; if you intend to use Subversion together with Apache, be sure to configure Subversion so that it will use a compatible version of `apr` and `apr-utils`, ideally those of Apache. If not, you'll be able to build Subversion and the bindings, but you most certainly have issues later on, when using mod_python (e.g. #2920). * Read `./subversion/bindings/swig/INSTALL` in order to build the bindings. In particular, pay attention to the version of SWIG which can be required (1.3.0 comes with pre-generated wrappers, though). Do not install swig 1.3.28 or 1.3.29. Version 1.3.27 seems to works fine (Although not in all cases. The subversion users mailing lists suggest going back to 1.3.25, which may be necessary). * In your subversion source root, do `make swig-py; make install-swig-py` (NOTE: there is a dash between 'install' and 'swig'!) * Adapt your `PYTHONPATH` so that it contains the `svn-python` folder (the one containing the `svn` and `libsvn` packages). [[br]] e.g. if svn is installed in `/opt/subversion-1.4.4`: {{{ # export PYTHONPATH=$PYTHONPATH:/opt/subversion-1.4.4/lib/svn-python` }}} If you're using TracModPython, be sure that Apache will also see this environment variable, or alternatively use the [TracModPython#Subversionissues PythonPath] mod_python directive.[[br]][[br]]You may also just copy the libsvn/ and svn/ directories in the resulting installation directories, e.g. /usr/local/lib/svn-python/, to the site-packages/ directory in your /usr/lib/python2.x/ directory. Python will then find them without having to adapt your `PYTHONPATH`. === Getting Subversion working === (this is a cite from TracOnDebianSarge as this is extremely useful for first time user setting up subversion repository) To create a Subversion project at '''/var/svn/project''', issue these commands to get SVN up and running: {{{ $ mkdir /var/svn $ mkdir /var/svn/project $ mkdir /tmp/project $ mkdir /tmp/project/branches $ mkdir /tmp/project/tags $ mkdir /tmp/project/trunk $ svnadmin create /var/svn/project $ svn import /tmp/project file:///var/svn/project -m "initial import" $ rm -rf /tmp/project }}} Fix permissions to the repository: {{{ $ find /var/svn/project -type f -exec chmod 660 {} \; $ find /var/svn/project -type d -exec chmod 2770 {} \; $ chown -R root.www-data /var/svn/project }}} == Trac and specific Subversion versions == {{{ #!comment The following info about pre 1.3.0 versions is all ''by heart'' and is probably inaccurate at places. This is mostly to get the page started. Feel free to correct me and publicly humiliate me :) }}} Note that the notes below about Subversion releases below 1.6 are mostly there for historical reasons. Everyone should be using at least 1.6.x these days. We make no strong guarantee about running an old version of Subversion with a recent version of Trac, though there are good chances that Subversion 1.4 still works with Trac 1.0dev. Note that Trac always had issues with Subversion repositories using the Berkeley DB backend. If you happen to have such a repository, it would be a good idea to switch it to the FSFS backend if you intend to use it together with Trac. See google:svn+convert+bdb+to+fsfs. === Trac and Subversion 1.4 === Trac used to work well with Subversion 1.4. This is now the oldest supported Subversion version (older versions might work, see [[.@105#TracandSubversion1.0|version 105]] of this page, but we make no guarantee). I've noticed that there has been some improvements to the `ra` layer ... unfortunately not available yet for the Python bindings Also, that version supports SWIG 1.3.29, but so far I used the 1.3.25 pre-generated wrappers that are bundled with the tarball. '''Issue #2611 was [comment:ticket:2965:14 confirmed] to be still be present for 1.4 (and probably newer versions of svn as well). Also, ''the issue is most certainly related to the use of multiple python sub-interpreters'', either because those are created by default when different virtual hosts are used (#2965, #3455) or because different `"PythonInterpreter"` directives are used in different sections (#2713). '''A workaround consists to force the use of a single Python interpreter''', using the `"PythonInterpreter"` directive with the same argument for all the virtual hosts, as explained [comment:ticket:3455:5 here]. See also: [http://svn.apache.org/repos/asf/subversion/tags/1.4.0/CHANGES release notes for 1.4.0] === Trac and Subversion 1.5 === Trac works fine with Subversion 1.5. The svn:mergeinfo properties are supported since version 0.12, though if you have lots of branches and many many changesets, this could slow down the source browser (#8459). Non-inheritable mergeinfo is supported since [milestone:0.12.1] (#9622). The new authz format is supported since [milestone:0.12.1] (#8289). The new svn:externals format is still work in progress (#7687). === Trac and Subversion 1.6 === Trac works best with Subversion 1.6. A couple of memory leaks were fixed in 1.6 and you might benefit from these fixes. === Trac and Subversion 1.7 === Trac seems to work fine with 1.7.0 as well, however be sure to use Trac >= 0.12.3. == Troubleshooting == ==== `RuntimeError: instance.__dict__ not accessible in restricted mode` ==== #instance-dict-restricted-mode This is becoming one of the most frequently reported issues for Trac and the Subversion backend, when the TracModPython web front-end is used. The problem happen when Trac is running outside of the "main_interpreter" Python interpreter and can be fixed as explained in #3371: {{{ ... PythonInterpreter main_interpreter ... }}} This problem can also occur when using mod_wsgi for both embedded mode or daemon mode. As documented in [http://code.google.com/p/modwsgi/wiki/IntegrationWithTrac integrating Trac with mod_wsgi], the solution is the same as for mod_python. That is, force Trac instance to run in main Python interpreter instance. When using mod_wsgi this is done using: {{{ ... WSGIApplicationGroup %{GLOBAL} ... }}} ==== `TypeError: argument number 0: a 'apr_pool_t *' is expected, 'instance()' is received` ==== Use the same fix as above. See #2611 for more information if needed. ==== `ImportError: /usr/local/lib/libsvn_ra_dav-1.so.0: undefined symbol: ...` ==== #ra_dav-undefined-symbol This error manifests itself quite frequently with Subversion 1.4, the `undefined symbol` in question may differ (`gss_delete_sec_context`, `SSL_shutdown`, etc.) See the advices of Garrett !McGrath in googlegroups:trac-users:1ec307bef7552e5e and also #3706. ==== `SubversionException: ("Expected version '3' of repository; found version '5'", ...` ==== #version-mismatch The bindings used are older than the Subversion version used to create the repository (#3943). ==== `SubversionException: ('No such revision XY', 160006)` ==== #no-such-revision This kind of error seems to happen frequently. Sometimes it seems to be related to the Trac cache being out-of-sync and needing a manual `resync` (#2739, #3301, #3728); this can happen if the repository was rebuilt and its UUID hasn't changed. Sometimes it seems to be because the repository is temporarily unavailable (#2346), and sometimes, we simply don't know yet (#3773, #3861, #3875). ==== `Unsupported version control system "svn"` ==== #unsupported-vcs By far one of our most commonly reported installation issue (search:'"Unsupported version control system"'), this simply means that the Python bindings for Subversion can't be loaded by Trac. For Trac 1.0 (trunk) above [11082], another common cause might simply be that the components for Subversion, are not enabled, since they're now optional. See [#tracopt] above for more details. If you use Debian an try this: TracOnDebianSarge If you use FreeBSD try this: [root@host /usr/ports/devel/py-subversion]# make FORCE_PKG_REGISTER= install clean This can be due to a variety of reasons, and you should go through the following check list to find out. ==== Check list ==== When there's some trouble using the Subversion bindings, it usually helps to perform the following checks: 1. Verify that you can load the bindings using the Python interactive interpreter {{{ $ python Python ... >>> from svn import core }}} If this succeeds, that's a good start. If it doesn't, it usually means that your bindings are located in a place they can't be loaded from. So either move the `svn` and `libsvn` found in the /opt/subversion-xxx/lib/svn-python folder into your site-packages folder, or add the above folder to your PYTHONPATH, or create a [http://docs.python.org/lib/module-site.html svn.pth] file in your Python site-packages folder with the above folder path as its single line content (an example on a FreeBSD installation, again: /usr/local/lib/pythonN.N/site-packages/). One simple solution for rpm-based operating systems, is to install the subversion-python bindings rpm. The [http://subversion.apache.org/packages.html#redhat official subversion site] points [http://summersoft.fay.ar.us/pub/subversion/latest/ here] to download those packages. For Collabnet 1.3 on Windows the solution was {{{set PYTHONPATH=C:\csvn\lib\svn-python}}} If you get the message {{{ImportError: libsvn_swig_py-1.so.0: cannot open shared object file: No such file or directory}}} even though you can see the .so file in the correct place, then try {{{ldconfig -v}}} as root. '''Windows Users''' [=#checklist-windows] According to the README.txt file for the Subversion bindings, if you are using Python 2.5+ you need to rename all the .dll files in the libsvn folder to .pyd files. Upon further research, http://www.python.org/doc/faq/windows/#is-a-pyd-file-the-same-as-a-dll indicates you may need to have both the .pyd and .dll version of the libsvn files available. This resolved both the '`ImportError: No module named _core`' error (with only the DLL) and the '`ImportError: DLL load failed`' (with only the pyd) when testing from the console, and the browser. Note that the bindings don't come with all the necessary files, you also need to have svn binaries (`libeay32.dll`, `libsasl.dll`, etc.) available on the path. If these files aren't available, you will receive the error `ImportError: DLL load failed:`. Upon investigating with `depends.exe`, I found that `core.pyd` loaded, unloaded, then failed to load. So, when downloading from http://alagazam.net for instance, the Python bindings are not sufficient. Pick up the subversion binaries as well and put them on your PATH. Don't use 64bit version of Python. The Subversion project does not provide amd64 or ia64 setup executables, so if you want to use Subversion integration, you’ll need to either compile the bindings yourself, or use the x86 version of Python. A good way to diagnose a //DLL load failed// error is to use the [http://www.dependencywalker.com/ depends.exe] tool from the console in which you'd run python.exe, and do a `depends.exe absolute-path-to/python.exe` instead. Then, press `F7` (//Start Profiling...// - you need at least version 2.0 of depends.exe) and type `from svn import core` at the Python prompt in the new cmd window. This will try to load the bindings, but this time you'll be able to see //why// this fails, by spotting the .DLLs shown in red in the Module list, and there are really lots of options here ;-) '''Mac OS X Users''' Subversion 1.5.X defaults installs in /opt/subversion/. The svn.pth solution works up to this point, but Trac will still be unhappy: you will need to copy `/opt/subversion/lib/svn-python/svn` & `/opt/subversion/lib/svn-python/libsvn` on top of `/System/Library/Frameworks/Python.framework/Versions/Current/Extras/lib/python/libsvn` and `/System/Library/Frameworks/Python.framework/Versions/Current/Extras/lib/python/svn`. 2. Check the version {{{ >>> (core.SVN_VER_MAJOR, core.SVN_VER_MINOR, core.SVN_VER_MICRO, core.SVN_VER_PATCH) (1, 4, 3, 3) }}} Verify that the version given back matches your expectation. 3. Check that you're using the right binaries (Linux) Get the pid of the above running Python interpreter (i.e. once the binding is loaded), and get the list of the libraries used by looking at the corresponding map file. e.g. {{{ cat /proc/10213/maps | grep .so | cut -d/ -f2- | sort -u }}} In particular, pay attention to the `.../lib/svn-python/libsvn/_core.so` file and see if its location seems to be consistent with both those of the other svn libraries (`.../lib/*.so`) and the location of the Python code part of the bindings (`.../lib/svn-python/svn/core.py`). 4. Have you got SVN disabled in your trac.ini file? Starting with Trac 1.0, the Subversion components need to be explicitly enabled. See [#tracopt] above, if you haven't yet. Before Trac 1.0, the Subversion specific modules were always enabled, but even then it could happen that for some reason, people had explicitly disabled those and possibly forgot about it. If so, set it/them to enabled (or simply delete the offending lines, since I believe they are enabled by default.) {{{ [components] trac.versioncontrol.api.repositorymanager = enabled trac.versioncontrol.svn_authz.svnauthzoptions = enabled trac.versioncontrol.svn_fs.subversionconnector = enabled trac.versioncontrol.svn_prop.subversionmergepropertydiffrenderer = enabled trac.versioncontrol.svn_prop.subversionmergepropertyrenderer = enabled trac.versioncontrol.svn_prop.subversionpropertyrenderer = enabled }}} (so again, the above module `svn_fs`/`svn_prop` names are only valid before Trac 1.0, see [#tracopt] starting from 1.0) 3. If you're using Apache / mod_python (Linux/Windows) (first tip) Get a similar list of libraries, but this time for one of your httpd process. Then compare the two, and pay attention to any difference between the `svn` libraries and the `apr` libraries. You ''have to'' have compatible APR libraries between Apache and Subversion, otherwise you risk to get a wide variety of subtle errors (e.g. #4985). 4. If you're using Apache / mod_python (Linux) (second tip) If you have installed the Subversion .so-Files in some "remote" location, Apache may be unable to find them (and thus unable to pass them on to Python/Trac, such that Trac cannot find Subversion). To check if this is the case, do the following: {{{ /etc/init.d/apache2 stop $export LD_LIBRARY_PATH=/usr/lib/python/site-packages/libsvn/:$LD_LIBRARY_PATH /etc/init.d/apache2 restart }}} If this works, you need to add the library path permanently. There are two options for this. Either add it in the Apache configuration file (http://httpd.apache.org/docs/2.2/mod/mod_env.html#setenv) or at the system level by adding the path to /etc/ld.so.conf, and then run ldconfig. More information on shared libraries can be found here: http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html 5. if you're getting 'undefined symbol: xmlCreatePushParserCtxt' while running make check-swig-py, it could be that your libneon is compiled against libxml2. If this is the case, try to recompile your libneon against expat instead of libxml2. 6. If you're using Apache - mod_python/mod_wsgi (Windows) Try replacing the {{{libapr-1.dll}}} in the Apache bin with the version that's in Python's libsvn or Subversion's bin, just substituting seems to fix it. See #6739 for more details. == Known Issues == [[TicketQuery(status=!closed&keywords=~svn&type=defect)]] == Asking for More Support About Subversion == * !ReadTheFineBook: http://svnbook.red-bean.com and/or the [http://subversion.apache.org/faq.html FAQ] * There's also a `#svn` channel on the `freenode` IRC network * If you think you've found a bug in Subversion, read these [http://subversion.apache.org/issue-tracker.html instructions]