$ git clone -n https://src.fedoraproject.org/rpms/rust-yuv.git /var/lib/mock/f45-build-46317-833/root/chroot_tmpdir/scmroot/rust-yuv
Cloning into '/var/lib/mock/f45-build-46317-833/root/chroot_tmpdir/scmroot/rust-yuv'...
$ git fetch origin 7a6ec9ba2439ffdf864a368724ea09e055c2b34c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-yuv
 * [new ref]         7a6ec9ba2439ffdf864a368724ea09e055c2b34c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a6ec9b Update to version 0.8.17; Fixes RHBZ#2512742