$ git clone -n https://src.fedoraproject.org/rpms/rust-copypasta.git /var/lib/mock/f40-build-2189984-51418/root/chroot_tmpdir/scmroot/rust-copypasta
Cloning into '/var/lib/mock/f40-build-2189984-51418/root/chroot_tmpdir/scmroot/rust-copypasta'...
$ git fetch origin 5e8d6e8ceca12d0ba72c488a179722457565be42:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-copypasta
 * [new ref]         5e8d6e8ceca12d0ba72c488a179722457565be42 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e8d6e8 Update to 0.10.0 (rhbz#2243596)