$ git clone -n https://src.fedoraproject.org/rpms/rubygem-activejob.git /var/lib/mock/f45-build-34765-691/root/chroot_tmpdir/scmroot/rubygem-activejob
Cloning into '/var/lib/mock/f45-build-34765-691/root/chroot_tmpdir/scmroot/rubygem-activejob'...
$ git fetch origin 6bf8dcf1942cc5ee3634bca579b7a9ee02256686:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-activejob
 * [new ref]         6bf8dcf1942cc5ee3634bca579b7a9ee02256686 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6bf8dcf Update to Action Job 8.1.3.1.