cvsserver: Add asciidoc documentation for new database backend configuration

Documents the new configuration variables and the variable
substitution mechanism.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-cvsserver.txt b/Documentation/git-cvsserver.txt
index f00e6d87e84647b2e4ad059332ce6241fd810a65..6a5fcfddb3759132cb5d515cbb97e790f15420ec 100644 (file)
--- a/Documentation/git-cvsserver.txt
+++ b/Documentation/git-cvsserver.txt
@@ -65,11 +65,12 @@ env variable, you can rename git-cvsserver to cvs.
 
 ------
 Note: you need to ensure each user that is going to invoke git-cvsserver has
-write access to the log file and to the git repository. When offering anon
-access via pserver, this means that the nobody user should have write access
-to at least the sqlite database at the root of the repository.
+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.
 
-Both configuration variables can also be overriden for a specific method of
+[[configaccessmethod]]
+All configuration variables can also be overriden 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.
@@ -105,6 +106,84 @@ 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 persitent data and can be completly
+regenerated from the git repository at any time. The database
+needs to be updated (i.e. written to) after every commit. 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 also write access to the directory.
+
+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
 ------------------------