# Koji/CBS buildsystem

## CBS permissions

!!! important
    Before being able to submit build tasks to koji/cbs, you need to have a valid [account](auth.md) and be member of a SIG group ! So be sure you followed all steps described in [doc](auth.md) before trying any other step

If you followed the needed steps to get your account and your workstation prepared with needed packages and TLS certs in place, we can proceed with basic validation.

Let's try first to confirm that we can reach CBS/koji and be authenticated (assuming that your username is `user` :

```
# cbs hello

g'day, <user>!

You are using the hub at https://cbs.centos.org/kojihub/
Authenticated via client certificate /home/<user>/.centos.cert

```

Now, if you're member of a SIG group (identified as `sig-<groupname>` , the following command should list your all your rights and you should see a corresponding `build-<groupname>` permission : 

```
# cbs list-permissions --mine
build
livecd
appliance
image
build-configmanagement
livemedia

```

As you can see, cbs/koji is using a 1:1 relationship between FAS/ACO group membership (sig-<groupname>) and the corresponding permissions to submit tasks against specific tags (see below) associated with that SIG.

!!! note
    Just worth knowing that when you're added to a SIG group it can take just some minutes due to replication between FreeIPA servers and fasjson.fedoraproject.org to catch up, as that's the endpoint that cbs.centos.org is using to compute/modify rights. So just keep that in mind and wait for permissions to be returned as shown above before trying anything else


## Understanding tags and targets

### Koji naming convention

A `build target` specifies the buildroot and destination of a package for submission. That means that as a user you ask koji to build a package within a specific build environment (build target) that is using a specific buildroot to find dependencies, etc. 
A `Tag` is how koji is grouping packages all together, and built packages can be automatically added to a tag after a successfull build, or added manually between other tags with the `tag-build` koji task. 

### CBS SIGs tags structure

As you understood, each `build target` in CBS koji instance will have at least four tags : 

  * the -build one (which is where pkg is built and using the configured buildroot)
  * three levels that will be used to promote packages after :
    * candidate (default tag where built packages are tagged to)
    * testing 
    * release

Our koji tag structure *must* follow always the following structure (really for CBS, not the rule for koji but it's important for automation and release to mirror network steps) :

`<SIG><CentOS_version>-<Project>-<Version>-{candidate,testing,release}` , where:

  * SIG : SIG name , corresponding to IPA group, without the `sig-` prefix (so `sig-cloud` would become `cloud`)
  * CentOS Version: .el version, so 7 means CentOS 7, 8s means CentOS Stream 8, and so on
  * Project : the project that the SIG want to build
  * Version : project version, can be a number or a string
  * repo variant: one of the following : candidate, testing or release (see Delivery about the meaning for these levels)


Let's use one example, the `Cloud` SIG would like to build Openstack (Yoga release) for CentOS Stream 9

The build target would be `cloud9s-openstack-yoga-el9s` and the tags would be : cloud9s-openstack-yoga-{candidate,testing,release}



### Submit a build on CBS

Before being able to submit a build task in koji, one has to be the pkg owner for it for all possible tags, so if you want to become the "owner" of a pkg for your own SIG/group, you can proceed like this (and replace `ACO_name`, `pkg_name` and `basetag` with real values :

```
for level in candidate testing release ; do
  cbs add-pkg --owner=<ACO_name> ${<basetag>}-${level} <pkg_name>
done
```

Now you can submit a build task by pointing to git.centos.org URL, pointing to project to build and git commit hash (assuming that you proceeded with needed steps in the [git](git.md) part :

```
cbs build git+https://git.centos.org/rpms/<pkg_name>.git#<commit_hash>
```

!!! note
    you can always submit a test build by adding `--scratch` to the build command as argument : that would really build the pkg but wouldn't make it available anywhere to be used. Please avoid using --scratch though as it consumes resources on the build systems for nothing


### Promoting packages to mirror network

See dedicated [Delivery](delivery.md) documentation