aecvsserver - serve CVS client protocol against Aegis projects
The aecvsserver command is used to serve the CVS client protocol. The
repository, of course, is stored within Aegis.
The server works by retrieving file contents from locations within
Aegis change sets and repositories. When necessary, appropriate
aegis(1) commands are executed by the server to fulfill the requests.
This code is still experimental. At the present time only a limited
number of CVS commands are understood. If you would like to extend
this code, contributions are welcome. The following commands are
thought to work at this time: add, admin, checkout, commit, init,
To use the server, you will need to set the following environment
It is also possible to use aecvsserver as a cvs pserver, with all the
usual caveats about how insecure this access method is, because it
transmits the password almost in the clear. The root and modules are
The CVS concept of modules is mapped onto Aegis concept of projects and
changes. The special CVSROOT administrative module is simulated.
Projects as Modules
Each Aegis project appears to the CVS client as a module; the module’s
name is the same as the Aegis project’s name. This type of module
isn’t immediately useful except for the cvs export command, or to
perform a read-only cvs checkout command.
You can’t commit to a project-named module. This because Aegis
requires all operations which would change the repository to be
performed through a change set.
It is theoretically possible to code aecvsserver to create a change
(via aenc(1) and aedb(1) commands), then add the necessary files (via
aenf(1) and aecp(1) commands), then build (via the aeb(1) command),
then test (via the aet(1) command), and finally to end development of
the change (via the aede(1) command). As the CVS protocol
"The protocol makes it possible for updates to be atomic with
respect to checkins; that is, if someone commits changes to
several files in one cvs command, then an update by someone else
would either get all the changes, or none of them. The current
cvs server can’t do this, but that isn’t the protocol’s fault."
This code is yet to be written. Contributions welcome.
The protocol, however, doesn’t make it particularly easy, either. The
semantics of the Modify request change depending on whether it is
followed by the commit request or the update request.
Changes as Modules
Each Aegis change set also appears to the CVS client as a module; it’s
name is project.Cnumber. All cvs add commands, cvs remove commands,
cvs update commands and cvs commit commands are performed against the
change set, not directly to the baseline. It is necessary for the
change set to already exist, and once you have run the cvs commit
command, it will the be necessary to use the aede(1) command and the
rest of the usual Aegis process.
Once a change is no longer in the being developed state, it cannot be
changed via aecvsserver(1) and you will need to create a new Aegis
change set, and then cvs checkout a new client-side work area.
Please note: if you are experimenting with the interface via cvs -d
:fork:/aegis or similar, the work area you create must be outside the
Aegis change set’s development directory.
The CVSROOT module’s contents are synthesized from Aegis meta-data.
You can’t add or modify files in this module; you need to administer
Aegis directly with aegis(1) commands.
The aecvsserver command will exit with a status of 1 on any error. The
aecvsserver command will only exit with a status of 0 if there are no
See aegis(1) for a list of environment variables which may affect this
command. See aepconf(5) for the project configuration file’s project_
specific field for how to set environment variables for all commands
executed by Aegis.
aecvsserver version 4.24.3.D001
Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Peter
The aecvsserver program comes with ABSOLUTELY NO WARRANTY; for details
use the ’aecvsserver -VERSion License’ command. This is free software
and you are welcome to redistribute it under certain conditions; for
details use the ’aecvsserver -VERSion License’ command.
Peter Miller E-Mail: firstname.lastname@example.org
/\/\* WWW: http://www.canb.auug.org.au/~millerp/