Building custom images: Difference between revisions
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#REDIRECT [[Build system]] |
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{{Developers}} |
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== Motivation == |
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This tutorial explains how you can build a completely customized OS image which can be used with: |
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* Emulators such as [[QEMU]] and [[VMware]] |
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* Laptops running in developer mode (see [[Activation and developer keys]] about running your xo in developer mode and [[Clean-install procedure]] about installing OS images) |
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== Prerequisites == |
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The following procedure has been tested on a Fedora 8 x86_64, but should work just fine on Fedora 7 and on i386. |
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Any Linux distribution capable of running yum should be able to run [[Pilgrim]], maybe with minor adjustments. |
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The intended audience of this document is an OS developer with some experience in rebuilding RPMs and managing yum repositories. |
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== Preparation == |
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Before installing pilgrim, you need to install mtd-utils. |
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sudo yum install mtd-utils |
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git clone git://dev.laptop.org/users/cscott/pilgrim |
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cd pilgrim |
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make |
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sudo make install |
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Note: this will litter your system with pilgrim files, but you can clean it up later with <tt>make uninstall</tt>. |
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== Prepare your custom repositories == |
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Build your custom RPMs and place them in a directory accessible via http. |
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It is recommended, but not necessary, to adopt the standard Fedora layout: |
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i386/os/ - i386 and noarch packages |
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i386/debug/ - debuginfo packages |
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source/ - src rpms |
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Create or update the RPM metadata information for your repositories: |
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createrepo i386/os |
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createrepo i386/debug |
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createrepo source |
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== Pilgrim customization == |
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=== Adding your yum repositories === |
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Edit <tt>streams.d/olpc-development-yum-install.conf</tt> and append your yum repository |
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(you only need the one containing the binary RPMs here). Mine looks like this: |
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[olpc-bernie] |
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name=OLPC bernie - i386 |
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baseurl=http://www.codewiz.org/pub/olpc-bernie/i386/os/ |
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enabled=1 |
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gpgcheck=0 |
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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. |
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If you provide the full set of OS packages in your repository, then you should remove the default repositories altogether. |
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=== Adding repositories for the target === |
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Edit <tt>streams.d/olpc-development.stream</tt>, and find the line saying |
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"Writing out configuration for OLPC yum repo". The repositories listed here |
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will appear in <tt>/etc/yum.repos.d</tt> on the target and are only used when |
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the image is booted on the target. |
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Add your yum repositories below the official ones. |
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This is what I do for xtest: |
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# keep this in sync with same repo defined in olpc-development-yum-install.conf |
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cat <<EOF > $INSTALL_ROOT/etc/yum.repos.d/olpc-development.repo |
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[olpc_development] |
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name=OLPC development |
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baseurl=http://koji.fedoraproject.org/static-repos/dist-olpc2-build-current/i386/ |
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enabled=1 |
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gpgcheck=0 |
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EOF |
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cat <<EOF > $INSTALL_ROOT/etc/yum.repos.d/olpc-bernie.repo |
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[olpc-bernie] |
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name=OLPC bernie - \$basearch |
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baseurl=http://www.codewiz.org/pub/olpc-bernie/\$basearch/os/ |
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enabled=1 |
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gpgcheck=0 |
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[olpc-bernie-debuginfo] |
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name=OLPC bernie - \$basearch - Debug |
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baseurl=http://www.codewiz.org/pub/olpc-bernie/\$basearch/debug/ |
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enabled=0 |
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gpgcheck=0 |
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[olpc-bernie-source] |
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name=OLPC bernie - Source |
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baseurl=http://www.codewiz.org/pub/olpc-bernie/source/ |
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enabled=0 |
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gpgcheck=0 |
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EOF |
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=== Adding and removing packages === |
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The list of packages that will be installed is in <tt>streams.d/olpc-development.stream</tt>. |
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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. |
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== Further reading == |
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Read <tt>README.olpc</tt> in the root directory of Pilgrim for further information. |
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The short story is: |
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(become root) |
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./pilgrim-autobuild --config-dir . --stream olpc-development --dest-dir . |
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If you're only interest in the jffs2 image, do: |
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./pilgrim-autobuild --config-dir . --stream olpc-development --dest-dir . --variant devel_jffs2 |
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To install OS images see [[Clean-install procedure]]. |
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== We want you! == |
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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. |
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[[Category:Developers]] |
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[[Category:OS]] |
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[[Category:Build system]] |
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Latest revision as of 16:50, 8 February 2011
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