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====== Subversion Tips ==
===== Links ==

[[svnbook>1.5/|Svnbook]] - [[http://www.linux-magazin.de/heft_abo/ausgaben/2003/06/nachfolgemodell|SVN Intro]] (german) - [[CVS Tips]] - [[Mercurial Tips]]

===== Apache Server Configuration ==

  * Uncomment or add the following to /etc/httpd/httpd.conf and restart Apache:<code>
LoadModule auth_digest_module lib/httpd/modules/mod_auth_digest.so
LoadModule dav_module lib/httpd/modules/mod_dav.so
LoadModule dav_svn_module lib/httpd/modules/mod_dav_svn.so
LoadModule authz_svn_module lib/httpd/modules/mod_authz_svn.so

<Location /svn>
  DAV svn
  SVNParentPath /home/svn
  SVNListParentPath on
  AuthType Digest
  AuthName "Subversion Repositories"
  AuthUserFile /home/svn/.htpasswd
  AuthDigestProvider file
  Require valid-user
</Location>
</code>
  * Create the directiory ''/home/svn''
  * Add one or more users with [[apache_httpd#protect_a_directory_with_digest_authentication|htdigest]]
  * Type ''svnadmin create /home/svn/test'' to create a repository called ''test''
  * Type ''chown -R apache:apache /home/svn/*''
  * Point your browser to http://localhost/svn to browse the repository/ies

===== svnserve Server Configuration ==

<note>This is not necessary if Apache Server (see above) is used!</note>

==== Required ==

Server OS is [[install_config_tips|Slackware Linux]] 11.0. Infos are collected from the [[svnbook>1.5/|svnbook]] and [[http://faleiros.eti.br/?q=svn|this site]]. The easiest alternative for running a svn server is used, i.e. ''svnserve'' as daemon. No apache, no SSH is used:

<code bash>
su -
groupadd svn
useradd -g svn -d /home/svn svn
mkdir /home/svn
chown svn:svn /home/svn
su svn
rm /home/svn/.* # delete .bash_history
svnadmin create /home/svn
exit
chmod -R o-rwx /home/svn
</code>

Note: The svnserve process ist started as a separate user ''svn'' as [[svnbook>1.4/svn.serverconfig.choosing.html#svn.serverconfig.choosing.recommendations|recommended]]. This increases security, but seems to prevent local access via ''%%file:///home/svn/...%%'' urls.

To start svnserve at boot time, append this to /etc/rc.d/rc.local:
  su svn -c "/usr/bin/svnserve -d -r /home/svn"

To give users access to the repository, edit /home/svn/conf/svnserv.conf and /home/svn/conf/passwd see [[svnbook>1.4/svn.serverconfig.svnserve.html#svn.serverconfig.svnserve.auth|Built-in authentication and authorization]]

==== Browser Interface Configuration ==

This is optional. www.viewvc.org is mentioned in svnbook and used. Viewvc requieres Subversion with its SWIG Python bindings. Install swig e.g. from linuxpackages.

The Subversion which comes with Slack 11.0 is compiled witout swig/python support. Therefore download from the Slack source subversion dir, eg form [[slackmirror>slackware-11.0/source/d/subversion/|here]].

Now the buildscript ''subversion.SlackBuild'' has to be patched a bit in order to include the python bindings:
<code>
53a54
> make swig-py || exit 1
55a57
> make install-swig-py DESTDIR=$PKG
88a91,93
> mkdir -p $PKG/usr/lib/python2.4/site-packages
> echo "/usr/lib/svn-python" > $PKG/usr/lib/python2.4/site-packages/svn.pth
>
</code>

Run the buildscript to create a the package and install the package with ''upgradepkg --reinstall subversion-1.4.0-i486-1.tgz''

Install viewvc by running ''viewrc-install'' (described in ''viewrc-1.0.4/INSTALL'')

Edit ''/usr/local/viewrc-1.0.4/viewrc.conf'':
<code>
80c80
< #svn_roots = svn: /home/svnrepos
---
> svn_roots = svn: /home/svn
105c105
< default_root = cvs
---
> default_root = svn
</code>

//Copy// (symlinks don't work) ''/usr/local/viewrc-1.0.4/bin/cgi/*.cgi'' to ''/var/www/cgi-bin''

Add user ''nobody'' (Apache) to group ''svn'' in ''/etc/group'' to give Apache read permission for the svn repository. Then restart Apache and point your browser to http://server-hostname/cgi-bin/viewvc.cgi/.

===== Other Administration ==
==== Rename a Repostitory ==

Just use normal ''mv'' as root. [[http://svnbook.red-bean.com/en/1.7/svn.reposadmin.maint.moving-and-removing.html|See also]]

==== Locks ==

View and remove locks: 
  svnadmin lslocks /local/path/to/repo
  svnadmin rmlocks /local/path/to/repo

Clients can remove own and other locks as well. See below!

[[svnbook>1.7/svn.ref.html|more]]

===== Client Configuration ==

If you use the provieded command line svn client no config at all is necessary. This is also true if [[cygwin]] is used as environment. Username and password are stored automatically after first login, see [[svnbook>1.4/svn.serverconfig.netmodel.html#svn.serverconfig.netmodel.credcache|client credentials caching]].

===== Client Usage ==

Commands refere to the SVN command line client which comes with SVN. Snytax for usage of SVN over HTTP is used. If the svnserve protocol is used, just replace ''%%http://%%'' with ''%%svn://%%''.

[[svnbook>1.4/svn.ref.html|Subversion Complete Reference]]

==== First Import ==

Create a project. 3 directories are [[svnbook>1.4/svn.branchmerge.maint.html|recommended]]:

  becki@client:~/test$ tree testproj/
  testproj/
  |-- branches
  |-- tags
  `-- trunk
      `-- main.c

The import command imports the ''testproj'' project to the root dir of the repostitory also as project ''testproj''

  becki@client:~/test$ svn import testproj http://<servername>/<svnrootdir>/<reponame>/testproj

==== Checkout ==

  svn co http://<servername>/<svnrootdir>/<reponame>/testproj

This creates the dir ''testproj'' in the current dir and fills it with the content of the project. If you want to have another directory name, just append the alternative name:

  svn co http://<servername>/<svnrootdir>/<reponame>/testproj alternativeDirName

==== Check working copy status ==

  [svn up]
  svn st [-u] [-v] [file or dir]

  * -u adds working revision and server out-of-date information
  * -v prints full revision information on every item

The status seems to be always against the current head revision number of the //local copy//, not of the head of the repository. Therefore it is advisable to run ''svn update'' before.

See [[svnbook>1.4/svn.ref.svn.c.status.html]]

  svn info

shows the highest revision of the current working dir.

==== See history of files, dirs and projects ==

  [svn up]
  svn log [-v] [fileOrDir]

The log seems to be always against the current head revision number of the //local copy//, not of the head of the repository. Therefore it is advisable to run ''svn update'' before running log.

FIXME verify: This way, you can always get a //complete// log o your project by changing into the root dir of the projcet, issuing the update command and then the log command.

==== Updating working directory ==

  svn up

Brings changes from the head revision of the repository into the current dir and preserves local changes.

  svn up -r <refNumber>

Brings the current dir into the state of revision of <refNumber> of the repository (and preserves local changes :?:). ''svn info'' reveals the revision of the current working dir.

==== Move Files and Dirs ==

  svn move <from> <to>

Works just like the shell ''mv'' command :-) See  [[svnbook>1.4/svn.ref.svn.c.move.html]]

==== Give up working copy ==

According to http://svn.haxx.se/dev/archive-2002-08/1385.shtml there is no command like the ''release'' of CVS. Just delete the working copy locally.

==== Branching ==
=== Intro ==

A branch is created simply by [[svnbook>1.5/svn.branchmerge.using.html#svn.branchmerge.using.create|making a copy]] of the project. SVN knows only how to copy. Copies may have the [[svnbook>1.5/svn.branchmerge.using.html#svn.branchmerge.using.concepts|meaning]] of branches or tags.

It is recommended to do the copy on the server, not locally. The remote copy also includes the commit in one step. Eg:

  svn cp http://url/project/trunk http://url/project/branches/foo -m "Creating a branch for working on feature foo"
  svn checkout http://url/project/branches/foo

  project
  |-- branches
  |   `-- foo
  |-- tags
  `-- trunk


=== Use Cases ==

  * Try out a new feature in a separate branch without disturbing the trunk
  * Create a branch from an older revision to make a bug fix
  * FIXME Create client-specific variants of the same main project eg. for special needs of customers

==== Merging ==
=== Intro ==

<note tip>Merging ([[svnbook>1.5/svn.branchmerge.advanced.html#svn.branchmerge.advanced.advancedsyntax|explanation]] / [[svnbook>1.5/svn.ref.svn.c.merge.html|manpage]]): Apply the changes between repository tree X and repository tree Y into the working directory. Any revision on any branch is a repository tree.</note>

  * FIXME Verify: Merging is not symmetrical, i.e. if a line was added to a file between rev X and rev Y, than ''merge X Y'' will add that line to the file in the working dir and ''merge Y X'' will //remove// that line!
  * Merging can not just happen between branches, but also between older revisions in the same branch
  * Merging does not always need to cover the whole project, it can be restricted to subdirs or single files. See also [[svnbook>1.5/svn.branchmerge.basicmerging.html]] -> selectively “copy” changes
  * Have a //clean// working directory before merging :!:
  * It is also possible to specify only one repository tree source (e.g. the tunk) with the merge command. In this case, all modifications of the trunk since you first created your branch (which you work on) are applied to the working dir. Used e.g to [[svnbook>1.5/svn.branchmerge.basicmerging.html#svn.branchemerge.basicmerging.stayinsync|keep a branch in sync]].
  * For merging finishd branches which are to be discontinued and merged back into the trunk, the ''--reintegrate'' option is [[svnbook>1.5/svn.branchmerge.basicmerging.html#svn.branchemerge.basicmerging.stayinsync|necssary]]
  * AFAIK it is not possible to easily keep two branches in sync (merge in both directions) like in [[mercurial_tips#merging|Mercurial]]. Basic merging in SVN is meant to frequently update branches from the trunk and finally reintegrate the branch into the trunk. To keep two branches in sync, advanced merging (with manual bookkeeping about what has already been merged) is necessary.

=== Use Cases ==

  * Merge a new feature in a separate branch into the trunk
  * Merge bug fixes of an older revision into the trunk
  * FIXME Merge common parts of client-specific branches
  * Undo committed Changes, see below


==== Undoing Changes ==
=== Undoing lokal Changes ==

See [[svnbook>1.4/svn.ref.svn.c.revert.html|revert]]

=== Undoing committed Changes ==

  svn merge [--dry-run] -r 627:480 http://url/project

This command removes all changes which have been done between r480 and r627 //in the workin copy//. Afterwards a commit is necessary.

See also [[svnbook>1.4/svn.branchmerge.commonuses.html]] -> Undoing Changes

=== Commit Log Message Correction ==

Example:
  svnadmin setlog /path/to/repository --bypass-hooks logmessage.txt -r 25120

See also: [[svnbook>1.5/svn.reposadmin.maint.html#svn.reposadmin.maint.setlog|Svnbook]]

==== Locks ==

View locks:
  svn st -u

  * O: Lock from someone else
  * K: Own lock

Create and remove locks: 
  svn lock file
  svn unlock file

[[svnbook>1.7/svn.advanced.locking.html|more]] -> from "Discovering Locks" on
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