$ git clone -n https://src.fedoraproject.org/rpms/rust-bytecount.git /var/lib/mock/f40-build-2081196-49749/root/chroot_tmpdir/scmroot/rust-bytecount
Cloning into '/var/lib/mock/f40-build-2081196-49749/root/chroot_tmpdir/scmroot/rust-bytecount'...
$ git fetch origin 1f0198977af5eeff11aa0d44c29cc8706a318ba5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bytecount
 * [new ref]         1f0198977af5eeff11aa0d44c29cc8706a318ba5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f01989 Update to version 0.6.7; Fixes RHBZ#2245599