$ git clone -n https://src.fedoraproject.org/rpms/rust-concurrent-queue.git /var/lib/mock/f39-build-1488704-34499/root/chroot_tmpdir/scmroot/rust-concurrent-queue
Cloning into '/var/lib/mock/f39-build-1488704-34499/root/chroot_tmpdir/scmroot/rust-concurrent-queue'...
$ git fetch origin b01710370b6edf198ff314d3bef366bea36e9561:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-concurrent-queue
 * [new ref]         b01710370b6edf198ff314d3bef366bea36e9561 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b017103 Update to version 2.3.0; Fixes RHBZ#2240656