$ git clone -n https://src.fedoraproject.org/rpms/rapidyaml.git /var/lib/mock/f42-build-3530690-46321/root/chroot_tmpdir/scmroot/rapidyaml
Cloning into '/var/lib/mock/f42-build-3530690-46321/root/chroot_tmpdir/scmroot/rapidyaml'...
$ git fetch origin b4b13bc7239a901eba2810b12deb0b06fa98a35b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rapidyaml
 * [new ref]         b4b13bc7239a901eba2810b12deb0b06fa98a35b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4b13bc Update to 0.9.0 (close RHBZ#2358956)