$ git clone -n https://src.fedoraproject.org/rpms/rust-crossbeam-channel.git /var/lib/mock/f40-build-2258133-54338/root/chroot_tmpdir/scmroot/rust-crossbeam-channel
Cloning into '/var/lib/mock/f40-build-2258133-54338/root/chroot_tmpdir/scmroot/rust-crossbeam-channel'...
$ git fetch origin e0dbf71788cbfa146f95b9fd88307ef162ae7e2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-crossbeam-channel
 * [new ref]         e0dbf71788cbfa146f95b9fd88307ef162ae7e2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e0dbf71 Update to version 0.5.11; Fixes RHBZ#2257264