$ git clone -n https://src.fedoraproject.org/rpms/mrcpp.git /var/lib/mock/f39-build-1511678-35546/root/chroot_tmpdir/scmroot/mrcpp
Cloning into '/var/lib/mock/f39-build-1511678-35546/root/chroot_tmpdir/scmroot/mrcpp'...
$ git fetch origin 9a70ce093f22ef42901dda32f01752cbc0586196:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mrcpp
 * [new ref]         9a70ce093f22ef42901dda32f01752cbc0586196 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a70ce0 Patch in Catchv3 support