$ git clone -n https://src.fedoraproject.org/rpms/rust-bytecheck.git /var/lib/mock/f45-build-40551-773/root/chroot_tmpdir/scmroot/rust-bytecheck
Cloning into '/var/lib/mock/f45-build-40551-773/root/chroot_tmpdir/scmroot/rust-bytecheck'...
$ git fetch origin a9d798a5910356e1318c8a2fede8ccfb0faa82b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bytecheck
 * [new ref]         a9d798a5910356e1318c8a2fede8ccfb0faa82b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9d798a Update to version 0.8.3; Fixes RHBZ#2511482