Git/lookaside

Package sources checked into git.centos.org are in exploded SRPM format. This means that the package working directory should have at least a SPECS/ subdirectory.

New Package (from source)

If the package you'd like to build isn't yet on https://git.centos.org, create first a ticket on https://pagure.io/centos-infra/issues to request the git repo for /rpms/<your_package> to be created

Once it will be created, it will be possible for you to push to specific branches, based on the following rules: c{7,8}-<sig_name>*

So that means that if I'm member of the sig-core group (in ACO), I'll be able to commit/push to c8-sig-core or c8-sig-core-whatever-I-want branches

Let's use the following example : I need to create a branch for pkg centpkg-minimal, and I'm member of the sig-core SIG group. We have to push two things to git.centos.org :

• .spec files to build a src.rpm
• eventually blob (.tar.gz archive) that will need to be pushed to lookaside cache

Pushing first to lookaside cache

Let's assume that my pkg centpkg-minimal that I want to build has an archive called centpkg.minimal.tar.gz. To be able to push to lookaside cache, we need the following :

• a valid TLS cert (also needed to build on cbs.centos.org) obtained through centos-cert util
• lookaside_upload script in your $PATH (coming from centos-git-common git repo, see above)

This simple script would need some paramters:

lookaside_upload 

You need to call the script like this : ~/bin/lookaside_upload -arguments

        -f : filename/source to upload (required, default:none)
        -n : package name for that source (requred, default:none, example "httpd")
        -b : "branch" where to upload to (required, default:none, example "c7-sig-core")
        -h : display this help

So back to our example, the pkg name is centpkg-minimal, file is centpkg-minimal.tar.gz and I'm member of the sig-core group, and want to build it for c7, so we'll call it like this :

lookaside_upload -f centpkg-minimal.tar.gz -n centpkg-minimal -b c7-sig-core
[+] CentOS Lookaside upload tool -> Checking if file already uploaded
[+] CentOS Lookaside upload tool -> Initialing new upload to lookaside
[+] CentOS Lookaside upload tool -> URL : https://git.centos.org
[+] CentOS Lookaside upload tool -> Source to upload : centpkg-minimal.tar.gz 
[+] CentOS Lookaside upload tool -> Package name: centpkg-minimal
[+] CentOS Lookaside upload tool -> sha1sum: d6616b89617914a0dd0fd5cfa06b0afc7a4541c4
[+] CentOS Lookaside upload tool -> Remote branch: c7-sig-core
[+] CentOS Lookaside upload tool ->  ====== Trying to upload =======

################################################################################################################ 100.0%
File centpkg-minimal.tar.gz size 15178 CHECKSUM d6616b89617914a0dd0fd5cfa06b0afc7a4541c4 stored OK
[+] CentOS Lookaside upload tool -> Validating that source was correctly uploaded ....
[+] CentOS Lookaside upload tool -> [SUCCESS] Source should be available at https://git.centos.org/sources/centpkg-minimal/c7-sig-core/d6616b89617914a0dd0fd5cfa06b0afc7a4541c4

Now that we have uploaded to lookaside cache, we can reference it in our /rpms/centpkg-minimal git repository on git.centos.org, see below

Pushing to git.centos.org

We should already have a local checkout of the git repository for the pkg we'd like to work on. In our case, the git repo url is https://git.centos.org/rpms/centpkg-minimal

So the way to git clone/pull over ssh is so ssh://git@git.centos.org/rpms/centpkg-minimal.git :

git clone ssh://git@git.centos.org/rpms/centpkg-minimal.git
Cloning into 'centpkg-minimal'...
remote: Counting objects: 15, done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 15 (delta 2), reused 0 (delta 0)
Receiving objects: 100% (15/15), done.
Resolving deltas: 100% (2/2), done.

Let's create a new c7-sig-core branch (still based on the assumption that I want to build for c7) :

git checkout -b c7-sig-core

You can now create your SPECS/<pkg_name>.spec and add also other text patches under SOURCES/ We still need also to point to /sources/ for the lookaside cache, so we'll use the value of the hash returned when we successfully uploaded to lookaside cache and we'll write a .<pkg_name>.metadata file in the root dir that will look like this in our example:

d6616b89617914a0dd0fd5cfa06b0afc7a4541c4 SOURCES/centpkg-minimal.tar.gz

Now that we have pointer to lookaside cache, and also .spec, we can push back to git and we should be able to proceed with the "build-from-git" on cbs.centos.org. Let's commit first :

# git add <files> # if needed
git commit -a 
git push origin c7-sig-core # to create the c7-sig-core branch on git.centos.org if not existing yet