$ git clone -n https://src.fedoraproject.org/rpms/libfyaml.git /var/lib/mock/f45-build-16208-483/root/chroot_tmpdir/scmroot/libfyaml
Cloning into '/var/lib/mock/f45-build-16208-483/root/chroot_tmpdir/scmroot/libfyaml'...
$ git fetch origin 9c4d22b32cefd0a1299e0d1088aa6cd06a63dff4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libfyaml
 * [new ref]         9c4d22b32cefd0a1299e0d1088aa6cd06a63dff4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c4d22b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild