$ git clone -n https://src.fedoraproject.org/rpms/rust-ubyte.git /var/lib/mock/f40-build-2064180-49167/root/chroot_tmpdir/scmroot/rust-ubyte
Cloning into '/var/lib/mock/f40-build-2064180-49167/root/chroot_tmpdir/scmroot/rust-ubyte'...
$ git fetch origin 5bcf245e38d08d487bbd8af39e65820f0d351848:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ubyte
 * [new ref]         5bcf245e38d08d487bbd8af39e65820f0d351848 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bcf245 Update to version 0.10.4; Fixes RHBZ#2241829