$ git clone -n https://src.fedoraproject.org/rpms/akonadi-contacts.git /var/lib/mock/f42-build-side-1-3568017-46743/root/chroot_tmpdir/scmroot/akonadi-contacts
Cloning into '/var/lib/mock/f42-build-side-1-3568017-46743/root/chroot_tmpdir/scmroot/akonadi-contacts'...
$ git fetch origin c21f6b2fd091a8ca46bb8ff97b2a17cba467ec86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/akonadi-contacts
 * [new ref]         c21f6b2fd091a8ca46bb8ff97b2a17cba467ec86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c21f6b2 25.04.2