Building custom images: Difference between revisions

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#REDIRECT [[Build system]]
{{Developers}}

== Motivation ==

This tutorial explains how you can build a completely customized OS image which can be used with:

* Emulators such as [[QEMU]] and [[VMware]]
* Laptops running in developer mode (see [[Activation and Developer Keys]]).

== Prerequisites ==
The following procedure has been tested on a Fedora 8 x86_64, but should work just fine on Fedora 7 and on i386.

Any Linux distribution capable of running yum should be able to run pilgrim, maybe with minor adjustments.

The intended audience of this document is an OS developer with some experience in rebuilding RPMs and managing yum repositories.


== Preparation ==

FIXME: are there any prerequisite packages to install?

git clone git://dev.laptop.org/users/cscott/pilgrim
cd pilgrim
make
sudo make install

Note: this will litter your system with pilgrim files, but you can clean it up later with <tt>make uninstall</tt>.


== Prepare your custom repositories ==

Build your custom RPMs and place them in a directory accessible via http.
It is recommended, but not necessary, to adopt the standard Fedora layout:

i386/os/ - i386 and noarch packages
i386/debug/ - debuginfo packages
source/ - src rpms

Create or update the RPM metadata information for your repositories:

createrepo i386/os
createrepo i386/debug
createrepo source


== Pilgrim customization ==

=== Adding your yum repositories ===

Edit <tt>streams.d/olpc-development-yum-install.conf</tt> and append your yum repository
(you only need the one containing the binary RPMs here). Mine looks like this:

[olpc-bernie]
name=OLPC bernie - i386
baseurl=http://www.codewiz.org/pub/olpc-bernie/i386/os/
enabled=1
gpgcheck=0

Note that I've explicitly specified <tt>i386</tt> because the <tt>$basearch</tt> variable would expand to <tt>x86_64</tt> on my host.

If you provide the full set of OS packages in your repository, then you should remove the default repositories altogether.


=== Adding repositories for the target ===

Edit <tt>streams.d/olpc-development.stream</tt>, and find the line saying
"Writing out configuration for OLPC yum repo". The repositories listed here
will appear in <tt>/etc/yum.repos.d</tt> on the target and are only used when
the image is booted on the target.

Add your yum repositories below the official ones.

This is what I do for xtest:

# keep this in sync with same repo defined in olpc-development-yum-install.conf
cat <<EOF > $INSTALL_ROOT/etc/yum.repos.d/olpc-development.repo
[olpc_development]
name=OLPC development
baseurl=http://koji.fedoraproject.org/static-repos/dist-olpc2-build-current/i386/
enabled=1
gpgcheck=0
EOF
cat <<EOF > $INSTALL_ROOT/etc/yum.repos.d/olpc-bernie.repo
[olpc-bernie]
name=OLPC bernie - \$basearch
baseurl=http://www.codewiz.org/pub/olpc-bernie/\$basearch/os/
enabled=1
gpgcheck=0
[olpc-bernie-debuginfo]
name=OLPC bernie - \$basearch - Debug
baseurl=http://www.codewiz.org/pub/olpc-bernie/\$basearch/debug/
enabled=0
gpgcheck=0
[olpc-bernie-source]
name=OLPC bernie - Source
baseurl=http://www.codewiz.org/pub/olpc-bernie/source/
enabled=0
gpgcheck=0
EOF

=== Adding and removing packages ===

The list of packages that will be installed is in <tt>streams.d/olpc-development.stream</tt>.

If your spec files are correct, you will only need to list the leaf packages here and yum will pull in all their dependencies automatically.


== Further reading ==

Read <tt>README.olpc</tt> in the root directory of Pilgrim for further information.

The short story is:

(become root)
./pilgrim-autobuild --config-dir . --stream olpc-development --dest-dir .

If you're only interest in the jffs2 image, do:

./pilgrim-autobuild --config-dir . --stream olpc-development --dest-dir . --variant devel_jffs2


FIXME: once pilgrim builds an os.img, how to update an XO box to run it?

== We want you! ==

Please send your patches to the [[http://lists.laptop.org/listinfo/devel development mailing-list]] for consideration. For large changes, just publish your git repository and provide the URL.


[[Category:Developers]]
[[Category:OS]]

Latest revision as of 16:50, 8 February 2011

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