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# Concurrent Versions System

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From https://www.nongnu.org/cvs/:

  Concurrent Versions System is a version control system, an important component of Source Configuration Management (SCM). Using it, you can record the history of sources files, and documents. It fills a similar role to the free software RCS, PRCS, and Aegis packages.

More recent alternatives are listed in Category:Version control system.

## Client

If you want to connect to a cvs server, install cvs and follow instructions from the owners of that server. For example https://www.openbsd.org/anoncvs.html.

Note: See FS#12636, some servers might require rsh. You can force the usage of ssh instead with the environment variable `CVS_RSH=ssh`.

### Graphical front-ends

- Cervisia — GUI for CVS. Part of kde-sdk.

  https://apps.kde.org/cervisia/ || cervisia

## Server

This article or section is out of date.

Reason: Should explain how to run the cvs server with systemd (see Fedora's cvs.socket and cvs@.service files) instead of relying on xinetd. (Discuss in Talk:Concurrent Versions System)

This is a quick guide on how to set up the latest CVS server.

### Installation

Install cvs and xinetdAUR.

Create the cvs user group - members of this group will have write access to the repository:

    # groupadd cvs

Create the cvs user in the cvs group (`-md` makes the home directory):

    # useradd -md /home/cvsroot -g cvs -p Insecure0 cvs

### Initialization

Initialize your CVS repository (as cvs):

    cvs% cvs -d /home/cvsroot init

The permissions on the directory (not the files inside, however) should be 2775 (drwxrwxr-x), but if not, run (as cvs):

    cvs% chmod 2775 /home/cvsroot

Add any users that you want to have local access to the repository to the group cvs by using the following two steps. You can add pre-existing users to the cvs group with the command:

    # gpasswd -a username cvs

Make a xinetd configuration file:

    /etc/xinetd.d/cvspserver

    service cvspserver
    {
            port            = 2401
            socket_type     = stream
            protocol        = tcp
            wait            = no
            user            = root
            passenv         = /home/cvsroot
            server          = /usr/bin/cvs
            server_args     = -f --allow-root=/home/cvsroot pserver
    }

Ensure you have the following line in `/etc/services` (add it if not):

    cvspserver 2401/tcp

Unset the `HOME` variable

    # unset HOME

And restart `xinetd.service`.

### Configuration

As the cvs user, create a `passwd` file in `~/CVSROOT`. To add entries in the file you can use htpasswd commands (present in the apache package) as follows:

    htpasswd -b filename username password

then edit the file and add the group, for example:

    # Format is username:password:group

    anonymous::
    archie:HopefullySecure0:cvs
    other:Insecure0:cvs

Now create a `writers` file in `~/CVSROOT`, which grants write privileges to the users you created in `passwd`:

    archie
    other

Now create a `readers` file in `~/CVSROOT`, which grants read privileges to the users you created in `passwd`:

    anonymous

Note: If a user is present in the readers file they cannot have write access too.

### Usage

You can test out the server using the following commands:

    $ export CVSROOT=:pserver:my_user_name@127.0.0.1:/home/cvsroot
    $ cvs login
    $ mkdir ~/sandbox
    $ mkdir ~/sandbox/myproject
    $ cd ~/sandbox/myproject
    $ echo "this is a sample file" > myfile
    $ cvs import -m "description of myproject" myproject v1 r1
    $ cd ..
    $ rm -R myproject
    $ cvs checkout myproject
    $ cd myproject
    $ echo "some changes to the file" >> myfile
    $ cvs commit -m "Explain changes here" myfile

Category:

- Version control system

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