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So, you want to run an anoncvs server.
A summary of the steps you'll need to do is:
1) Find enough disk space to hold the anoncvs tree, and mount it in an
appropriate place.
2) Compile and install anoncvssh, the shell used for the anoncvs user.
Install the cvsync client using 'pkg_add cvsync' command.
( If you aren't using OpenBSD you'll probably need to compile a cvsync
client as well. The easier path is to use OpenBSD ;).
3) Add the anoncvs user to the password file, with no password, and
anoncvssh as it's shell. Decide on a user that will run cvsync to maintain
the archive (this is a different user, NOT the anoncvs user).
4) Make a home directory for the anoncvs user. The anoncvs user's
home directory is a chroot jail in which the anoncvssh processes
run when servicing anoncvs requests. The jail must contain the
cvs binary as well as whatever shared libraries and support files
are needed to run them unless you compile and link everything
statically. This example shows what is needed for OpenBSD. If you
use another platform you'll need to be familiar with what needs
to go in a chroot jail for your platform.
5) Get permission to use cvsync to obtain the cvs tree from a server.
6) Set up cvsync to retrieve the cvs tree from an appropriate place.
7) Run cvsync to retrieve the distribution from the server.
8) Once you get the distribution in, set up a cron job to run cvsync
periodically to keep your server up to date.
9) Enabling OpenCVS anoncvs.
**********************************************************************
STEP 1) find enough disk space.
You need roughly 2GB.
Mount it on /open, make sure it doesn't have nosuid and nodev flags.
If you are not able to mount it as /open, substitute it's location
throughout the rest of this description.
**********************************************************************
STEP 2) compile the anoncvssh binary.
In the Makefile, change the variable CVSROOT.
Install the binary setuid-root in /open/anoncvssh.
**********************************************************************
STEP 3) Create the anoncvs account and decide who will run "cvsync"
to maintain the archive. The anoncvs account should *NOT* be the one
running cvsync to maintain the archive.
create an account similar to:
anoncvs::32766:32766::0:0:Anonymous CVS User:/open/anoncvs:/open/anoncvssh
Yes, that is right - the account has no password. Be sure that the
uid and gid are unique for your system, if the ones above aren't,
pick different values.
Decide who will run cvsync to maintain the archive. Call that user
$CVSYNCUSER. Oh, and in case it hasn't been previously mentioned,
$CVSYNCUSER should *NOT* be the anoncvs user :).
Set "PermitEmptyPasswords yes" option in /etc/ssh/sshd_config and
restart your sshd daemon.
**********************************************************************
STEP 4) Build the anoncvs user's home directory chroot jail. This
example assumes that you're using OpenBSD. If you're not you
may need different files in the chroot.
mkdir /open/anoncvs
mkdir /open/anoncvs/cvs
chown -R $CVSYNCUSER /open/anoncvs/cvs /open/anoncvs
Start filling the account up with nice stuff. You are building a chroot
jail for anoncvs in /open/anoncvs.
cd /open/anoncvs
touch .hushlogin
touch .profile
Put a message like the following in .plan:
To use anonymous CVS install the latest version of CVS on your local
machine.
Then set your CVSROOT environment variable to the following value:
[email][email protected][/email]:/cvs
mkdir bin dev tmp usr var etc
cp /bin/{cat,pwd,rm,sh} bin/
Using mknod, make a dev/null that has the same major/minor numbers as
your /dev/null, and make it mode 666.
Some shared library systems require a dev/zero created in the same way.
Fill etc space for the account
cp /etc/{group,hosts,passwd,protocols} etc/
cp /etc/{pwd.db,resolv.conf,services,ttys} etc/
modify these files to suit your idea of system security
anoncvssh (by setting the environment variable CVSREADONLYFS) uses
a tiny extension provided in the openbsd cvs server code which
permits the use of read-only cvs repositories, therefore you MUST
compile the openbsd version of cvs. Luckily this is not a problem
on a non-openbsd machine, since the cvs sources are imported verbatim
into the openbsd tree. They are in gnu/usr.bin/cvs. The sources
are integrated in such way that Makefile.bsd-wrapper knows how to build
the sources on an OpenBSD machine, using obj directories.
Create tmp space for the account
# (cd var && ln -s ../tmp tmp)
# chmod a+rwx tmp
# mkdir usr/{bin,lib}
# cp /usr/bin/cvs usr/bin/
If your system has ld.so in /usr/libexec,
# mkdir usr/libexec
# cp /usr/libexec/ld.so usr/libexec/
If using shared libraries, use ldd to find out which shared libs you need:
# ldd /usr/bin/cvs
/usr/bin/cvs:
Start End Type Open Ref GrpRef Name
1c000000 3c01f000 exe 1 0 0 /usr/bin/cvs
0f802000 2f80a000 rlib 0 1 0 /usr/lib/libz.so.4.1
020f3000 220f8000 rlib 0 1 0 /usr/lib/libgssapi.so.5.0
0530c000 2531c000 rlib 0 1 0 /usr/lib/libkrb5.so.17.0
03801000 23841000 rlib 0 1 0 /usr/lib/libcrypto.so.18.0
0a8fb000 2a900000 rlib 0 1 0 /usr/lib/libdes.so.9.0
094d2000 2950b000 rlib 0 1 0 /usr/lib/libc.so.51.0
094ca000 094ca000 rtld 0 1 0 /usr/libexec/ld.so
and then copy the required libraries to usr/lib/
As a final pass, make sure that all the files you have just created are
not world writable (except dev/null).
For :pserver: support (optional)
- Create an entry in /etc/services
cvspserver 2401/tcp # CVS client/server operations
- Create an entry in /etc/inetd.conf
cvspserver stream tcp nowait anoncvs /open/anoncvssh anoncvssh pserver
- Create a file /open/anoncvs/cvs/CVSROOT/passwd with the following entry
anoncvs:AHDysQkJIubEc
which would be a password of "anoncvs" (as per anoncvs.html)
- Create a file /open/anoncvs/cvs/CVSROOT/readers with a single entry:
anoncvs
which tells cvs that user "anoncvs" is allowed readonly access.
- Create a zero-length file /open/anoncvs/cvs/CVSROOT/writers since you don't
want anyone to be able to write to the mirror.
% cp /dev/null /open/anoncvs/cvs/CVSROOT/writers
See the example layout below for full details.
**********************************************************************
STEP 5): Get cvsync permission.
send mail to [EMAIL="[email protected]"][email protected][/EMAIL]
1) to have cvsync permissions granted on an appropriate machine for you
to cvsync from. We will need to know your host's real hostname and
IP address.
2) to have an anoncvsN.COUNTRY.openbsd.org alias created.
3) to have your site mentioned in the [URL]http://www.openbsd.org/anoncvs.html[/URL] page.
**********************************************************************
STEP 6): Configure cvsync.
You have to install cvsync package.
The file /etc/cvsync.conf contains the configuration of cvsync. It will
normally contain:
config {
base-prefix /open/anoncvs/
hostname anoncvs.ca.openbsd.org
collection {
name openbsd-cvsroot release rcs
prefix cvs
}
collection {
name openbsd-src release rcs
prefix cvs
}
collection {
name openbsd-ports release rcs
prefix cvs
}
collection {
name openbsd-www release rcs
prefix cvs
}
collection {
name openbsd-xenocara release rcs
prefix cvs
}
}
**********************************************************************
STEP 7): Run cvsync to retrieve the tree for the first time.
Log in as or become the $CVSYNCUSER, and run
cvsync > /tmp/cvsynclog &; tail -f /tmp/cvsynclog
If you have cvsync permission, and have specified the correct host and
prefix in /etc/cvsync.conf you should see a list of files start
coming in after a short while. Don't panic if nothing happens
immediately. Watch for errors (cvsync can timeout or die). If you can't
access files contact the cvsync server maintainer. If you get a timeout
or if cvsync dies you can restart and it should continue where it left off.
It can take a good while (and a couple of restarts) to obtain the
whole tree for the first time.
**********************************************************************
STEP 8): Set up cron to keep the tree up to date.
You run cvsync periodically from the cron by setting up the crontab file
of the $CVSYNCUSER.
For example, to update every two hours:
15 */2 * * * /usr/local/bin/cvsync > /dev/null
**********************************************************************
STEP 9): Enabling OpenCVS anoncvs.
The next step is to enable OpenCVS, which will run on your system next
to the normal GNU cvs server. This will become the default in the
future. 
First off, create a new user account "opencvs" like you did for your
normal anoncvs user:
opencvs::32766:32766::0:0:Anonymous OpenCVS User:/open/anoncvs:/open/anoncvssh
Be sure that the uid and gid are unique for your system, if the ones
above aren't, pick different values.
#define OPENCVS_USER "opencvs"
Recompile anoncvssh.c and install the binary setuid-root in /open/anoncvssh.
Compile and install a current /usr/bin/opencvs. 
Copy /usr/bin/opencvs to /open/anoncvs/usr/bin/opencvs
You can now use OpenCVS anoncvs by using the correct CVSROOT:
[email][email protected][/email]:/cvs
If you encounter bugs, send them to [EMAIL="[email protected]"][email protected][/EMAIL]
**********************************************************************
EXAMPLE LAYOUT
Example layout for OpenBSD. In this example "deraadt" is the $CVSYNCUSER.
$ cd /open
$ ls -alF
total 64
drwxr-xr-x 5 root wheel 512 Jun 18 22:29 ./
drwxr-xr-x 13 root wheel 512 Jun 4 05:14 ../
drwxr-xr-x 9 deraadt wheel 512 Jun 3 02:15 anoncvs/
---s--x--x 1 root wheel 14302 Jun 18 22:29 anoncvssh*
drwxr-xr-x 4 root wheel 5120 Jun 10 14:34 ftp/
$ cd anoncvs
$ ls -alF
total 68
drwxr-xr-x 9 root wheel 512 Jun 3 02:15 ./
drwxr-xr-x 5 root wheel 512 Jun 10 14:32 ../
-rw-r--r-- 1 root wheel 0 Jun 3 01:50 .hushlogin
-rw-r--r-- 1 root wheel 84 Jun 3 01:50 .plan
-rw-r--r-- 1 root wheel 0 Jun 3 01:50 .profile
drwxr-xr-x 2 root wheel 512 Jun 3 01:40 bin/
drwxr-xr-x 7 deraadt wheel 512 Jun 18 22:19 cvs/
drwxr-xr-x 2 root wheel 512 Jun 3 01:51 dev/
drwxr-xr-x 2 root wheel 512 Jun 3 01:53 etc/
drwxrwxrwx 10 root wheel 512 Jun 18 17:38 tmp/
drwxr-xr-x 5 root wheel 512 Jun 3 01:54 usr/
drwxr-xr-x 2 root wheel 512 Jun 3 01:54 var/
$ ls -alFR bin usr tmp etc dev
bin:
total 1984
drwxr-xr-x 2 root wheel 512 Jun 3 01:40 ./
drwxr-xr-x 9 root wheel 512 Jun 3 02:15 ../
-r-xr-xr-x 1 root wheel 132368 Jun 3 01:40 cat*
-r-xr-xr-x 1 root wheel 124176 Jun 3 01:40 pwd*
-r-xr-xr-x 1 root wheel 238864 Jun 3 01:40 rm*
-r-xr-xr-x 1 root wheel 460048 Jun 3 01:40 sh*
 
dev:
total 8
drwxr-xr-x 2 root wheel 512 Jun 3 01:51 ./
drwxr-xr-x 9 root wheel 512 Jun 3 02:15 ../
crw-rw-rw- 1 root wheel 3, 2 Jun 3 01:51 null
crw-rw-rw- 1 root wheel 3, 12 Jun 3 01:51 zero
 
etc:
total 188
drwxr-xr-x 2 root wheel 512 Jun 3 01:53 ./
drwxr-xr-x 9 root wheel 512 Jun 3 02:15 ../
-r--r--r-- 1 root wheel 64 Jun 3 01:52 group*
-r--r--r-- 1 root wheel 576 Jun 3 01:52 hosts*
-r--r--r-- 1 root wheel 291 Jun 3 01:53 passwd*
-r--r--r-- 1 root wheel 5625 Jun 3 01:52 protocols*
-r--r--r-- 1 root wheel 40960 Jun 3 01:52 pwd.db*
-r--r--r-- 1 root wheel 93 Jun 3 01:52 resolv.conf*
-r--r--r-- 1 root wheel 9875 Jun 3 01:52 services*
-r--r--r-- 1 root wheel 26428 Jun 3 01:52 ttys*
usr:
total 20
drwxr-xr-x 5 root wheel 512 Jun 3 01:54 ./
drwxr-xr-x 9 root wheel 512 Jun 3 02:15 ../
drwxr-xr-x 2 root wheel 512 Jun 3 01:57 bin/
drwxr-xr-x 2 root wheel 512 Jun 3 01:56 lib/
drwxr-xr-x 2 root wheel 512 Jun 3 01:55 libexec/
usr/bin:
total 3016
drwxr-xr-x 2 root wheel 512 Jun 3 01:57 ./
drwxr-xr-x 5 root wheel 512 Jun 3 01:54 ../
-r-xr-xr-x 1 root wheel 643728 Jun 3 01:54 cvs*
-r-xr-xr-x 1 root wheel 841240 Jun 3 01:57 opencvs*
usr/lib:
total 42344
drwxr-xr-x 2 root wheel 512 Jun 3 01:56 ./
drwxr-xr-x 5 root wheel 512 Jun 3 01:54 ../
-r--r--r-- 1 root wheel 4605409 Jun 3 01:56 libc.so.50.1
-r--r--r-- 1 root wheel 9659802 Jun 3 01:56 libcrypto.so.18.0
-r--r--r-- 1 root wheel 190814 Jun 3 01:56 libdes.so.9.0
-r--r--r-- 1 root wheel 1593303 Jun 3 01:55 libgssapi.so.5.0
-r--r--r-- 1 root wheel 5337583 Jun 3 01:56 libkrb5.so.16.0
-r--r--r-- 1 root wheel 182556 Jun 3 01:55 libz.so.4.1
usr/libexec:
total 120
drwxr-xr-x 2 root wheel 512 Jun 3 01:55 ./
drwxr-xr-x 5 root wheel 512 Jun 3 01:54 ../
-r-xr-xr-x 1 root wheel 55683 Jun 3 01:55 ld.so*
$ ls cvs
CVSROOT ports src www xenocara