python - Unsupported version control system "svn": No module named svn

[alexus]

Hello,

I'm using The Trac Project with TracModWSGI – The Trac Project on RHEL7:

    # cat /etc/redhat-release
    Red Hat Enterprise Linux Server release 7.0 (Maipo)
    # rpm -q httpd mod_wsgi subversion swig
    httpd-2.4.6-18.el7_0.x86_64
    mod_wsgi-3.4-12.el7_0.x86_64
    subversion-1.7.14-6.el7.x86_64
    swig-2.0.10-4.el7.x86_64
    # grep tracopt.versioncontrol conf/trac.ini
    tracopt.versioncontrol.git.* = enabled
    tracopt.versioncontrol.svn.* = enabled
    #

While trying to "Browse Source" (Subversion), I'm getting following error:

"Trac Error:" - "Unsupported version control system "svn": No module named svn"

"Logging":

    Trac[svn_fs] INFO: Failed to load Subversion bindings
    Traceback (most recent call last):
      File "build/bdist.linux-x86_64/egg/tracopt/versioncontrol/svn/svn_fs.py", line 296, in __init__
        _import_svn()
      File "build/bdist.linux-x86_64/egg/tracopt/versioncontrol/svn/svn_fs.py", line 78, in _import_svn
        from svn import fs, repos, core, delta
    ImportError: No module named svn

Issue is with Python bindings for Subversion can't be loaded by Trac:

    # python
    Python 2.7.5 (default, Feb 11 2014, 07:46:25)
    [GCC 4.8.2 20140120 (Red Hat 4.8.2-13)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> from svn import core
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    ImportError: No module named svn
    >>>
    #

Quote from TracSubversion – The Trac Project:

> One simple solution for rpm-based operating systems, is to install the
> subversion-python bindings rpm.

Unfortunately "No package subversion-python available.":

    # subscription-manager repos | grep '^Repo ID' | egrep -v 'beta|debug|fastrack|source'
    Repo ID:   rhel-7-server-v2vwin-1-rpms
    Repo ID:   rhel-7-server-rpms
    Repo ID:   rhel-7-server-extras-rpms
    Repo ID:   rhel-7-server-rhn-tools-rpms
    Repo ID:   rhel-7-server-thirdparty-oracle-java-rpms
    Repo ID:   rhel-7-server-rh-common-rpms
    Repo ID:   rhel-7-server-supplementary-rpms
    Repo ID:   rhel-7-server-optional-rpms
    # yum install subversion-python
    Loaded plugins: product-id, subscription-manager
    No package subversion-python available.
    Error: Nothing to do
    # yum repolist
    Loaded plugins: product-id, subscription-manager
    repo id                                   repo name                                               status
    !epel/x86_64                              Extra Packages for Enterprise Linux 7 - x86_64          7,192
    rhel-7-server-rpms/7Server/x86_64         Red Hat Enterprise Linux 7 Server (RPMs)                5,320
    repolist: 12,512
    #

I'm researching "pysvn" (as alternative) instead of "subversion-python" meanwhile.

Please advise.

[Ryan Ollos]

pysvn won't work. I'm not very familiar with RHEL, but it looks like our documentation says that the bindings will be installed when the  svn package is installed

http://trac.edgewall.org/wiki/TracSubversion#RedHatFedoraCentOSLinux

Here are some debugging steps to follow:

http://trac.edgewall.org/wiki/TracSubversion#unsupported-vcs

On Ubuntu running Trac in a virtualenv, I've had to manually create links in the site-packages, similar to what is described here: 

http://trac.edgewall.org/wiki/TracOnRedhat#Fixlibsvnpaths

[alexus]

Ryan,

First, I'd like to "Thank you for your reply".

As I mention in my topic subversion is already installed on my system:

# rpm -q subversion

subversion-1.7.14-6.el7.x86_64

# 

I also went over TracSubversion – The Trac Project and tried implementing some of it on my system as well:

# pwd

/usr/lib64/python2.7/site-packages

# cat svn.pth 

/usr/lib64/

# ll /usr/lib64/libsvn_*.0.0

-rwxr-xr-x. 1 root root 380256 Mar  5  2014 /usr/lib64/libsvn_client-1.so.0.0.0

-rwxr-xr-x. 1 root root  57488 Mar  5  2014 /usr/lib64/libsvn_delta-1.so.0.0.0

-rwxr-xr-x. 1 root root  70048 Mar  5  2014 /usr/lib64/libsvn_diff-1.so.0.0.0

-rwxr-xr-x. 1 root root  32704 Mar  5  2014 /usr/lib64/libsvn_fs-1.so.0.0.0

-rwxr-xr-x. 1 root root 201032 Mar  5  2014 /usr/lib64/libsvn_fs_base-1.so.0.0.0

-rwxr-xr-x. 1 root root 184680 Mar  5  2014 /usr/lib64/libsvn_fs_fs-1.so.0.0.0

-rwxr-xr-x. 1 root root  11152 Mar  5  2014 /usr/lib64/libsvn_fs_util-1.so.0.0.0

-rwxr-xr-x. 1 root root  49520 Mar  5  2014 /usr/lib64/libsvn_ra-1.so.0.0.0

-rwxr-xr-x. 1 root root  37320 Mar  5  2014 /usr/lib64/libsvn_ra_local-1.so.0.0.0

-rwxr-xr-x. 1 root root 162376 Mar  5  2014 /usr/lib64/libsvn_ra_neon-1.so.0.0.0

-rwxr-xr-x. 1 root root 104496 Mar  5  2014 /usr/lib64/libsvn_ra_svn-1.so.0.0.0

-rwxr-xr-x. 1 root root 191592 Mar  5  2014 /usr/lib64/libsvn_repos-1.so.0.0.0

-rwxr-xr-x. 1 root root 419168 Mar  5  2014 /usr/lib64/libsvn_subr-1.so.0.0.0

-rwxr-xr-x. 1 root root  83544 Mar  5  2014 /usr/lib64/libsvn_swig_py-1.so.0.0.0

-rwxr-xr-x. 1 root root 615296 Mar  5  2014 /usr/lib64/libsvn_wc-1.so.0.0.0

# 

as /usr/lib64 is where my "libsvn" resides.

same documentation also mentions following:

"One simple solution for rpm-based operating systems, is to install the subversion-python bindings rpm."

and again as I stated in my topic earlier "subversion-python" is not available for RHEL7.

if I overlooked something or you have any other ideas, please let me know.

Thanks again!

[Ryan Ollos]

On Mon, Feb 9, 2015 at 1:30 PM, alexus <ale...@gmail.com> wrote:

Ryan,

If I remember correctly Trac was installed via "easy_install", I'm not
seeing Trac inside of /usr/lib64/python2.7/site-package.

I already tried what you're proposing:

# cd /usr/lib64/python2.7/site-packages/
# cat svn.pth
/usr/lib64/

I think you should do a full search of your system for "svn" and "libsvn" directories and consider whether we are really pointing at the right directories.

 

# ll svn
lrwxrwxrwx. 1 root root 12 Feb  9 15:54 svn -> /usr/bin/svn

On Ubuntu, I didn't have the symlink for svn pointing to the svn executable, rather it pointed to an "svn" directory containing libraries.

 

# ll libsvn_*
lrwxrwxrwx. 1 root root 31 Feb  9 15:54 libsvn_client-1.so.0 ->
/usr/lib64/libsvn_client-1.so.0
lrwxrwxrwx. 1 root root 35 Feb  9 15:54 libsvn_client-1.so.0.0.0 ->
/usr/lib64/libsvn_client-1.so.0.0.0
lrwxrwxrwx. 1 root root 30 Feb  9 15:54 libsvn_delta-1.so.0 ->
/usr/lib64/libsvn_delta-1.so.0
lrwxrwxrwx. 1 root root 34 Feb  9 15:54 libsvn_delta-1.so.0.0.0 ->
/usr/lib64/libsvn_delta-1.so.0.0.0
lrwxrwxrwx. 1 root root 29 Feb  9 15:54 libsvn_diff-1.so.0 ->
/usr/lib64/libsvn_diff-1.so.0
lrwxrwxrwx. 1 root root 33 Feb  9 15:54 libsvn_diff-1.so.0.0.0 ->
/usr/lib64/libsvn_diff-1.so.0.0.0
lrwxrwxrwx. 1 root root 27 Feb  9 15:54 libsvn_fs-1.so.0 ->
/usr/lib64/libsvn_fs-1.so.0
lrwxrwxrwx. 1 root root 31 Feb  9 15:54 libsvn_fs-1.so.0.0.0 ->
/usr/lib64/libsvn_fs-1.so.0.0.0
lrwxrwxrwx. 1 root root 32 Feb  9 15:54 libsvn_fs_base-1.so.0 ->
/usr/lib64/libsvn_fs_base-1.so.0
lrwxrwxrwx. 1 root root 36 Feb  9 15:54 libsvn_fs_base-1.so.0.0.0 ->
/usr/lib64/libsvn_fs_base-1.so.0.0.0
lrwxrwxrwx. 1 root root 30 Feb  9 15:54 libsvn_fs_fs-1.so.0 ->
/usr/lib64/libsvn_fs_fs-1.so.0
lrwxrwxrwx. 1 root root 34 Feb  9 15:54 libsvn_fs_fs-1.so.0.0.0 ->
/usr/lib64/libsvn_fs_fs-1.so.0.0.0
lrwxrwxrwx. 1 root root 32 Feb  9 15:54 libsvn_fs_util-1.so.0 ->
/usr/lib64/libsvn_fs_util-1.so.0
lrwxrwxrwx. 1 root root 36 Feb  9 15:54 libsvn_fs_util-1.so.0.0.0 ->
/usr/lib64/libsvn_fs_util-1.so.0.0.0
lrwxrwxrwx. 1 root root 27 Feb  9 15:54 libsvn_ra-1.so.0 ->
/usr/lib64/libsvn_ra-1.so.0
lrwxrwxrwx. 1 root root 31 Feb  9 15:54 libsvn_ra-1.so.0.0.0 ->
/usr/lib64/libsvn_ra-1.so.0.0.0
lrwxrwxrwx. 1 root root 33 Feb  9 15:54 libsvn_ra_local-1.so.0 ->
/usr/lib64/libsvn_ra_local-1.so.0
lrwxrwxrwx. 1 root root 37 Feb  9 15:54 libsvn_ra_local-1.so.0.0.0 ->
/usr/lib64/libsvn_ra_local-1.so.0.0.0
lrwxrwxrwx. 1 root root 32 Feb  9 15:54 libsvn_ra_neon-1.so.0 ->
/usr/lib64/libsvn_ra_neon-1.so.0
lrwxrwxrwx. 1 root root 36 Feb  9 15:54 libsvn_ra_neon-1.so.0.0.0 ->
/usr/lib64/libsvn_ra_neon-1.so.0.0.0
lrwxrwxrwx. 1 root root 31 Feb  9 15:54 libsvn_ra_svn-1.so.0 ->
/usr/lib64/libsvn_ra_svn-1.so.0
lrwxrwxrwx. 1 root root 35 Feb  9 15:54 libsvn_ra_svn-1.so.0.0.0 ->
/usr/lib64/libsvn_ra_svn-1.so.0.0.0
lrwxrwxrwx. 1 root root 30 Feb  9 15:54 libsvn_repos-1.so.0 ->
/usr/lib64/libsvn_repos-1.so.0
lrwxrwxrwx. 1 root root 34 Feb  9 15:54 libsvn_repos-1.so.0.0.0 ->
/usr/lib64/libsvn_repos-1.so.0.0.0
lrwxrwxrwx. 1 root root 29 Feb  9 15:54 libsvn_subr-1.so.0 ->
/usr/lib64/libsvn_subr-1.so.0
lrwxrwxrwx. 1 root root 33 Feb  9 15:54 libsvn_subr-1.so.0.0.0 ->
/usr/lib64/libsvn_subr-1.so.0.0.0
lrwxrwxrwx. 1 root root 32 Feb  9 15:54 libsvn_swig_py-1.so.0 ->
/usr/lib64/libsvn_swig_py-1.so.0
lrwxrwxrwx. 1 root root 36 Feb  9 15:54 libsvn_swig_py-1.so.0.0.0 ->
/usr/lib64/libsvn_swig_py-1.so.0.0.0
lrwxrwxrwx. 1 root root 27 Feb  9 15:54 libsvn_wc-1.so.0 ->
/usr/lib64/libsvn_wc-1.so.0
lrwxrwxrwx. 1 root root 31 Feb  9 15:54 libsvn_wc-1.so.0.0.0 ->
/usr/lib64/libsvn_wc-1.so.0.0.0
#

without any luck(

On Mon, Feb 9, 2015 at 4:04 PM, Ryan Ollos <rjo...@gmail.com> wrote:

> Are you running Trac from a virtualenv, or rather is it installed in
> /usr/lib64/python2.7/site-packages?
>
> On Ubuntu 14.04 I've had to do the following (actually these steps might be
> out-of-date for 14.04, in which case they work in 12.04):
>
> Add the following line in svn.pth:
> /usr/lib/pyshared/python2.7/libsvn
>
> Add the following symbolic links lib/python2.7/site-packages:
> svn -> /usr/share/pyshared/svn
> libsvn -> /usr/share/pyshared/libsvn
>
> The exact steps will undoubtedly differ on RedHat, but maybe that gives you
> some things to look for.

--
http://alexus.org/

[Greg Earle]

On Feb 9, 2015, at 12:52 PM, alexus wrote:

> "One simple solution for rpm-based operating systems, is to install the
> subversion-python bindings rpm."
>
> and again as I stated in my topic earlier "subversion-python" is not
> available for RHEL7.

You appear to be using RHEL 7.0 Server, and one of your repos is

rhel-7-server-optional-rpms

I just noticed that

subversion-python-1.7.14-6.el7.x86_64.rpm

is readily available from the "rhel-7-workstation-optional-rpms" repo.

I don't know why it would be available in the Workstation Optional repo
but not in the Server Optional repo.

- Greg

[alexus]

Greg,

You're right, after I download & install rpm, binding works as expected now)

Thank you!

[Ryan Ollos]

On Tue, Feb 10, 2015 at 8:01 AM, alexus <ale...@gmail.com> wrote:

Greg,

You're right, after I download & install rpm, binding works as expected now)

Thank you!

It would be great if the documentation could be updated with your findings:

http://trac.edgewall.org/wiki/TracSubversion#RedHatFedoraCentOSLinux

Do you know whether symbolics links are needed, or is it sufficient to just install the python-subversion package the workstation repository?

 

[alexus]

actually that's it, as soon as I installed that missing rpm, it pretty much works out of the box, no need for any symbolic links.

[Ryan Ollos]

On Tue, Feb 10, 2015 at 1:13 PM, alexus <ale...@gmail.com> wrote:

actually that's it, as soon as I installed that missing rpm, it pretty much works out of the box, no need for any symbolic links.

Thanks, documented in:

http://trac.edgewall.org/wiki/TracSubversion?action=diff&version=124

Please refine the statement if you see room for improvement. 

[alexus]

Ryan,

http://trac.edgewall.org/wiki/TracSubversion?action=diff&version=125

[Ryan Ollos]

On Tue, Feb 10, 2015 at 2:53 PM, alexus <ale...@gmail.com> wrote:

Ryan,

http://trac.edgewall.org/wiki/TracSubversion?action=diff&version=125

That's great. Thanks! 

[alexus]

you're welcome, but it seems like jomae made another set of change and changes makes wiki incorrect again..

[Ryan Ollos]

On Wed, Feb 11, 2015 at 12:10 PM, alexus <ale...@gmail.com> wrote:

you're welcome, but it seems like jomae made another set of change and changes makes wiki incorrect again..

I don't have experience with RHEL to judge, but he may reply if you describe here which of edits you think are incorrect. Other RHEL users might have input as well.

[alexus]

Ryan,

I went through this in RHEL5, RHEL6 and now RHEL7.

I corrected it again in revision 128.

--
http://alexus.org/

[Jun Omae]

No, no, no.
subversion-python package is available since CentOS 7.
Subversion python bindings is included in subversion package in CentOS 5 and 6.



CentOS 6:

[root@localhost ~]# cat /etc/redhat-release
CentOS release 6.6 (Final)
[root@localhost ~]# yum list subversion
...
Installed Packages
subversion.x86_64 1.6.11-12.el6_6 @updates
[root@localhost ~]# yum list subversion-python
...
Error: No matching Packages to list
[root@localhost ~]# rpm -qf /usr/lib64/python2.6/site-packages/svn
subversion-1.6.11-12.el6_6.x86_64


CentOS 5:

[root@localhost ~]# cat /etc/redhat-release
CentOS release 5.11 (Final)
[root@localhost ~]# yum list subversion
...
Installed Packages
subversion.x86_64 1.6.11-12.el5_10 installed
[root@localhost ~]# yum list subversion-python
...
Error: No matching Packages to list
[root@localhost ~]# rpm -qf /usr/lib64/python2.4/site-packages/svn
subversion-1.6.11-12.el5_10

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--
Jun Omae <jun...@gmail.com> (大前 潤)

[alexus]

Actually You're 100% correct and I'm the one who's wrong. I'm mixed it with FreeBSD as on FreeBSD that's separate and on RHEL6 that comes with subversion, so I apologize for wrong information.