Samba4 developer howto
----------------------

tridge@samba.org, December 2004


This is a very basic document on how to setup a simple Samba4
server. This is aimed at developers who are already familiar with
Samba3 and wish to participate in Samba4 development. This is not
aimed at production use of Samba4.


Step 1: download Samba4
-----------------------

There are 2 methods of doing this:

  method 1:  "rsync -avz samba.org::ftp/unpacked/samba4 ."

  method 2:  "svn co svn://svnanon.samba.org/samba/branches/SAMBA_4_0 samba4"

both methods will create a directory called "samba4" in the current
directory. If you don't have rsync or svn then install one of them. 

Since only released versions of Samba contain a pregenerated configure script, 
you will have to generate it by hand:

 $ cd samba4/source
 $ ./autogen.sh

Note that the above rsync command will give you a checked out svn
repository. So if you also have svn you can update it to the latest
version at some future date using:

  $ cd samba4
  $ svn up

Step 2: compile Samba4
----------------------

Run this:

  $ cd samba4/source
  $ ./configure
  $ make proto all

If you have gcc 3.4 or newer, then substitute "pch" for "proto" to
greatly speed up the compile process (about 5x faster).

Step 3: install Samba4
----------------------

Run this as a user who have permission to write to the install
directory (defaults to /usr/local/samba). Use --prefix option to
configure above to change this.
 
  # make install


Step 4: provision Samba4
------------------------

The "provision" step sets up a basic user database. Make sure your smbscript
binary is installed in a directory listed in your PATH environment variable.
It is presumed it's available just like any other commands from your shell.
Must be run as a user with permission to write to the install directory.

  # cd source
  # ./setup/provision --realm=YOUR.REALM --domain=YOURDOM --adminpass=SOMEPASSWORD

'YOURDOM' is the NT4 style domain name. 'YOUR.REALM' is your kerberos
realm, which is typically your DNS domain name.

Step 5: Create a simple smb.conf
--------------------------------

The provisioning will create a very simple smb.conf with no shares by
default. You will need to update it to add at least one share. For
example:

  [test]
	path = /data/test
	read only = no


Step 6: starting Samba4
-----------------------

The simplest is to just run "smbd", but as a developer you may find
the following more useful:

   # smbd -i -M single

that means "start smbd without messages in stdout, and running a
single process. That mode of operation makes debugging smbd with gdb
particularly easy.

Note that now it is no longer necessary to have an instance of nmbd
from Samba 3 running.  If you are running any smbd or nmbd processes
they need to be stopped before starting smbd from Samba 4.

Make sure you put the bin and sbin directories from your new install
in your $PATH. Make sure you run the right version!


Step 7: testing Samba4
----------------------

try these commands:

     $ smbclient //localhost/test -Uadministrator%SOMEPASSWORD
    or
     $ ./script/tests/test_posix.sh //localhost/test administrator SOMEPASSWORD


NOTE about filesystem support
-----------------------------

To use the advanced features of Samba4 you need a filesystem that
supports both the "user" and "system" xattr namespaces.

If you run Linux with a 2.6 kernel and ext3 this means you need to
include the option "user_xattr" in your /etc/fstab. For example:

/dev/hda3		/home			ext3    user_xattr     1 1

You also need to compile your kernel with the XATTR and SECURITY
options for your filesystem. For ext3 that means you need:

   CONFIG_EXT3_FS_XATTR=y
   CONFIG_EXT3_FS_SECURITY=y

If you are running a Linux 2.6 kernel with CONFIG_IKCONFIG_PROC
defined you can check this with the following command:

   $ zgrep CONFIG_EXT3_FS /proc/config.gz

If you don't have a filesystem with xattr support, then you can
simulate it by using the option:

   posix:eadb = /usr/local/samba/eadb.tdb

that will place all extra file attributes (NT ACLs, DOS EAs, streams
etc), in that tdb. It is not efficient, and doesn't scale well, but at
least it gives you a choice when you don't have a modern filesystem.

Testing your filesystem
-----------------------

To test your filesystem support, install the 'attr' package and run
the following 4 commands as root:

  # touch test.txt
  # setfattr -n user.test -v test test.txt
  # setfattr -n security.test -v test2 test.txt
  # getfattr -d test.txt
  # getfattr -n security.test -d test.txt

You should see output like this:

  # file: test.txt
  user.test="test"

  # file: test.txt
  security.test="test2"

If you get any "Operation not supported" errors then it means your
kernel is not configured correctly, or your filesystem is not mounted
with the right options.

If you get any "Operation not permitted" errors then it probably means
you didn't try the test as root.