index 19c9c51cffec272d675cdaf1b223e2a6dff5dd3b..e5005f02f997437da3251f6c52c6efbdf06557b4 100644 (file)
----
git-cvsserver - A CVS server emulator for git
-
SYNOPSIS
--------
[verse]
export CVS_SERVER=git-cvsserver
'cvs' -d :ext:user@server/path/repo.git co <HEAD_name>
-
DESCRIPTION
-----------
LIMITATIONS
-----------
-Currently gitcvs only works over ssh connections.
+Currently cvsserver works over SSH connections for read/write clients, and
+over pserver for anonymous CVS access.
+
+CVS clients cannot tag, branch or perform GIT merges.
+
+git-cvsserver maps GIT branches to CVS modules. This is very different
+from what most CVS users would expect since in CVS modules usually represent
+one or more directories.
INSTALLATION
------------
-1. Put server.pl somewhere useful on the same machine that is hosting your git repos
+1. If you are going to offer anonymous CVS access via pserver, add a line in
+ /etc/inetd.conf like
++
+--
+------
+ cvspserver stream tcp nowait nobody git-cvsserver pserver
+
+------
+Note: Some inetd servers let you specify the name of the executable
+independently of the value of argv[0] (i.e. the name the program assumes
+it was executed with). In this case the correct line in /etc/inetd.conf
+looks like
+
+------
+ cvspserver stream tcp nowait nobody /usr/bin/git-cvsserver git-cvsserver pserver
+
+------
+No special setup is needed for SSH access, other than having GIT tools
+in the PATH. If you have clients that do not accept the CVS_SERVER
+environment variable, you can rename git-cvsserver to cvs.
+
+Note: Newer cvs versions (>= 1.12.11) also support specifying
+CVS_SERVER directly in CVSROOT like
+
+------
+cvs -d ":ext;CVS_SERVER=git-cvsserver:user@server/path/repo.git" co <HEAD_name>
+------
+This has the advantage that it will be saved in your 'CVS/Root' files and
+you don't need to worry about always setting the correct environment
+variable.
+--
2. For each repo that you want accessible from CVS you need to edit config in
the repo and add the following section.
-
++
+--
+------
[gitcvs]
enabled=1
+ # optional for debugging
logfile=/path/to/logfile
- n.b. you need to ensure each user that is going to invoke server.pl has
- write access to the log file.
-
-5. On each client machine you need to set the following variables.
- CVSROOT should be set as per normal, but the directory should point at the
- appropriate git repo.
- CVS_SERVER should be set to the server.pl script that has been put on the
- remote machine.
+------
+Note: you need to ensure each user that is going to invoke git-cvsserver has
+write access to the log file and to the database (see
+<<dbbackend,Database Backend>>. If you want to offer write access over
+SSH, the users of course also need write access to the git repository itself.
+
+[[configaccessmethod]]
+All configuration variables can also be overridden for a specific method of
+access. Valid method names are "ext" (for SSH access) and "pserver". The
+following example configuration would disable pserver access while still
+allowing access over SSH.
+------
+ [gitcvs]
+ enabled=0
-6. Clients should now be able to check out modules (where modules are the names
- of branches in git).
- $ cvs co -d mylocaldir master
+ [gitcvs "ext"]
+ enabled=1
+------
+--
+3. On the client machine you need to set the following variables.
+ CVSROOT should be set as per normal, but the directory should point at the
+ appropriate git repo. For example:
++
+--
+For SSH access, CVS_SERVER should be set to git-cvsserver
+
+Example:
+
+------
+ export CVSROOT=:ext:user@server:/var/git/project.git
+ export CVS_SERVER=git-cvsserver
+------
+--
+4. For SSH clients that will make commits, make sure their .bashrc file
+ sets the GIT_AUTHOR and GIT_COMMITTER variables.
+
+5. Clients should now be able to check out the project. Use the CVS 'module'
+ name to indicate what GIT 'head' you want to check out. Example:
++
+------
+ cvs co -d project-master master
+------
+
+[[dbbackend]]
+Database Backend
+----------------
+
+git-cvsserver uses one database per git head (i.e. CVS module) to
+store information about the repository for faster access. The
+database doesn't contain any persistent data and can be completely
+regenerated from the git repository at any time. The database
+needs to be updated (i.e. written to) after every commit.
+
+If the commit is done directly by using git (as opposed to
+using git-cvsserver) the update will need to happen on the
+next repository access by git-cvsserver, independent of
+access method and requested operation.
+
+That means that even if you offer only read access (e.g. by using
+the pserver method), git-cvsserver should have write access to
+the database to work reliably (otherwise you need to make sure
+that the database if up-to-date all the time git-cvsserver is run).
+
+By default it uses SQLite databases in the git directory, named
+`gitcvs.<module_name>.sqlite`. Note that the SQLite backend creates
+temporary files in the same directory as the database file on
+write so it might not be enough to grant the users using
+git-cvsserver write access to the database file without granting
+them write access to the directory, too.
+
+You can configure the database backend with the following
+configuration variables:
+
+Configuring database backend
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+git-cvsserver uses the Perl DBI module. Please also read
+its documentation if changing these variables, especially
+about `DBI->connect()`.
+
+gitcvs.dbname::
+ Database name. The exact meaning depends on the
+ used database driver, for SQLite this is a filename.
+ Supports variable substitution (see below). May
+ not contain semicolons (`;`).
+ Default: '%Ggitcvs.%m.sqlite'
+
+gitcvs.dbdriver::
+ Used DBI driver. You can specify any available driver
+ for this here, but it might not work. cvsserver is tested
+ with 'DBD::SQLite', reported to work with
+ 'DBD::Pg', and reported *not* to work with 'DBD::mysql'.
+ Please regard this as an experimental feature. May not
+ contain double colons (`:`).
+ Default: 'SQLite'
+
+gitcvs.dbuser::
+ Database user. Only useful if setting `dbdriver`, since
+ SQLite has no concept of database users. Supports variable
+ substitution (see below).
+
+gitcvs.dbpass::
+ Database password. Only useful if setting `dbdriver`, since
+ SQLite has no concept of database passwords.
+
+All variables can also be set per access method, see <<configaccessmethod,above>>.
+
+Variable substitution
+^^^^^^^^^^^^^^^^^^^^^
+In `dbdriver` and `dbuser` you can use the following variables:
+
+%G::
+ git directory name
+%g::
+ git directory name, where all characters except for
+ alpha-numeric ones, `.`, and `-` are replaced with
+ `_` (this should make it easier to use the directory
+ name in a filename if wanted)
+%m::
+ CVS module/git head name
+%a::
+ access method (one of "ext" or "pserver")
+%u::
+ Name of the user running git-cvsserver.
+ If no name can be determined, the
+ numeric uid is used.
Eclipse CVS Client Notes
------------------------
To get a checkout with the Eclipse CVS client:
-1. Create a new project from CVS checkout, giving it repository and module
-2. Context Menu->Team->Share Project...
-3. Enter the repository and module information again and click Finish
-4. The Synchronize view appears. Untick "launch commit wizard" to avoid
-committing the .project file, and select HEAD as the tag to synchronize to.
-Update all incoming changes.
-
-Note that most versions of Eclipse ignore CVS_SERVER (which you can set in
-the Preferences->Team->CVS->ExtConnection pane), so you may have to
-rename, alias or symlink git-cvsserver to 'cvs' on the server.
+1. Select "Create a new project -> From CVS checkout"
+2. Create a new location. See the notes below for details on how to choose the
+ right protocol.
+3. Browse the 'modules' available. It will give you a list of the heads in
+ the repository. You will not be able to browse the tree from there. Only
+ the heads.
+4. Pick 'HEAD' when it asks what branch/tag to check out. Untick the
+ "launch commit wizard" to avoid committing the .project file.
+
+Protocol notes: If you are using anonymous access via pserver, just select that.
+Those using SSH access should choose the 'ext' protocol, and configure 'ext'
+access on the Preferences->Team->CVS->ExtConnection pane. Set CVS_SERVER to
+'git-cvsserver'. Note that password support is not good when using 'ext',
+you will definitely want to have SSH keys setup.
+
+Alternatively, you can just use the non-standard extssh protocol that Eclipse
+offer. In that case CVS_SERVER is ignored, and you will have to replace
+the cvs utility on the server with git-cvsserver or manipulate your `.bashrc`
+so that calling 'cvs' effectively calls git-cvsserver.
Clients known to work
---------------------
-CVS 1.12.9 on Debian
-CVS 1.11.17 on MacOSX (from Fink package)
-Eclipse 3.0, 3.1.2 on MacOSX (see Eclipse CVS Client Notes)
-TortoiseCVS
+- CVS 1.12.9 on Debian
+- CVS 1.11.17 on MacOSX (from Fink package)
+- Eclipse 3.0, 3.1.2 on MacOSX (see Eclipse CVS Client Notes)
+- TortoiseCVS
Operations supported
--------------------
Legacy monitoring operations are not supported (edit, watch and related).
Exports and tagging (tags and branches) are not supported at this stage.
-The server will set the -k mode to binary when relevant. In proper GIT
-tradition, the contents of the files are always respected.
-No keyword expansion or newline munging is supported.
+The server should set the '-k' mode to binary when relevant, however,
+this is not really implemented yet. For now, you can force the server
+to set '-kb' for all files by setting the `gitcvs.allbinary` config
+variable. In proper GIT tradition, the contents of the files are
+always respected. No keyword expansion or newline munging is supported.
Dependencies
------------
This program is copyright The Open University UK - 2006.
-Authors: Martyn Smith <martyn@catalyst.net.nz>
- Martin Langhoff <martin@catalyst.net.nz>
- with ideas and patches from participants of the git-list <git@vger.kernel.org>.
+Authors:
+
+- Martyn Smith <martyn@catalyst.net.nz>
+- Martin Langhoff <martin@catalyst.net.nz>
+
+with ideas and patches from participants of the git-list <git@vger.kernel.org>.
Documentation
--------------
-Documentation by Martyn Smith <martyn@catalyst.net.nz> and Martin Langhoff <martin@catalyst.net.nz>Matthias Urlichs <smurf@smurf.noris.de>.
+Documentation by Martyn Smith <martyn@catalyst.net.nz>, Martin Langhoff <martin@catalyst.net.nz>, and Matthias Urlichs <smurf@smurf.noris.de>.
GIT
---