$ git clone -n https://src.fedoraproject.org/rpms/kernel.git /var/lib/mock/f42-build-side-1-3583934-46891/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/f42-build-side-1-3583934-46891/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin ec6bac03f61c009218e20b8d0039797b7c38ac6d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kernel
 * [new ref]             ec6bac03f61c009218e20b8d0039797b7c38ac6d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
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Updating files: 100% (97/97), done.
HEAD is now at ec6bac03f kernel-6.15.5-200