$ git clone -n https://src.fedoraproject.org/rpms/kget.git /var/lib/mock/f42-build-side-1-3537717-46560/root/chroot_tmpdir/scmroot/kget
Cloning into '/var/lib/mock/f42-build-side-1-3537717-46560/root/chroot_tmpdir/scmroot/kget'...
$ git fetch origin 6521b5b3a3ee2bdf985efbad2b18d2ff672cade4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kget
 * [new ref]         6521b5b3a3ee2bdf985efbad2b18d2ff672cade4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6521b5b 25.04.2