84 lines
3.4 KiB
Markdown
84 lines
3.4 KiB
Markdown
## Background on managing an OSTree repository
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Before you get started, it's recommended to read (at least) these two sections
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of the OSTree manual:
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- [buildsystem-and-repos](https://ostree.readthedocs.io/en/latest/manual/buildsystem-and-repos/)
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- [repository-management](https://ostree.readthedocs.io/en/latest/manual/repository-management/)
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## Generating OSTree commits from a CentOS base
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First, you'll need a copy of `rpm-ostree`. The current recommendation is to use
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a privileged container, but you can also install `rpm-ostree` directly to a
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physical or virtual machine.
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It's included in the package collection for Fedora, and there
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are [CentOS Core packages](http://buildlogs.centos.org/centos/7/atomic/x86_64/Packages/) as
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well as [bleeding edge CentOS builds](https://ci.centos.org/job/atomic-rdgo-centos7/).
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You can create a privileged container with e.g. `podman` via: `podman run
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--privileged registry.fedoraproject.org/fedora:27 ...`. However you create the
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environment, run `yum -y install rpm-ostree`.
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A good first thing to try would be using
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the
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[CentOS Atomic Host](https://github.com/CentOS/sig-atomic-buildscripts/tree/downstream) metadata
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to generate a custom host.
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One time setup, where we clone the git repository, then make two OSTree repos,
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one for doing builds, one for export via HTTP:
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```
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# mkdir /srv/centos-atomic
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# cd /srv/centos-atomic
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# git clone https://github.com/CentOS/sig-atomic-buildscripts -b downstream
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# mkdir build-repo
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# ostree --repo=build-repo init --mode=bare-user
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# mkdir repo
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# ostree --repo=repo init --mode=archive
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```
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We'll also want to cache downloaded RPMs:
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```
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# mkdir cache
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```
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## Running `rpm-ostree compose tree`
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This program takes as input a manifest file that describes the target system,
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and commits the result to an OSTree repository.
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The input format is a JSON "treefile". See examples in
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`api-doc/treefile-examples`. More real-world examples include the manifest
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for
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[Fedora Atomic](https://pagure.io/fedora-atomic/blob/master/f/fedora-atomic-host.json) and
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[CentOS Atomic](https://github.com/CentOS/sig-atomic-buildscripts/blob/downstream/centos-atomic-host.json).
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If you're doing this multiple times, it's strongly recommended to create a cache
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directory:
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```
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# rpm-ostree compose tree --cachedir=cache --repo=/srv/centos-atomic/build-repo sig-atomic-buildscripts/centos-atomic-host.json
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```
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This will download RPMs from the referenced repos, and commit the result to the
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OSTree repository, using the ref named by `ref`.
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Once we have that commit, let's export it:
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```
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# ostree --repo=repo pull-local build-repo centos-atomic-host/7/x86_64/standard
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```
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You can tell client systems to rebase to it by combining `ostree remote add`,
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and `rpm-ostree rebase` on the client side.
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## More information
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* [run-treecompose script from FAHC](https://pagure.io/fedora-atomic-host-continuous/blob/2f1214c9ff35e55ec111db86be96e14d4b6040d6/f/centos-ci/run-treecompose)
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* [Build Your Own Atomic](https://github.com/jasonbrooks/byo-atomic)
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* [Build Your Own Atomic Image, Updated](http://www.projectatomic.io/blog/2014/08/build-your-own-atomic-centos-or-fedora/)
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* [Creating custom Atomic trees, images, and installers, part 1](http://developerblog.redhat.com/2015/01/08/creating-custom-atomic-trees-images-and-installers-part-1/)
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* [Creating custom Atomic trees, images, and installers, part 2](http://developerblog.redhat.com/2015/01/15/creating-custom-atomic-trees-images-and-installers-part-2/)
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