$ git clone -n https://src.fedoraproject.org/rpms/rust-crossbeam-queue.git /var/lib/mock/f39-build-2236884-53524/root/chroot_tmpdir/scmroot/rust-crossbeam-queue
Cloning into '/var/lib/mock/f39-build-2236884-53524/root/chroot_tmpdir/scmroot/rust-crossbeam-queue'...
$ git fetch origin 265996eb680a1c0e976fc34881e7647bcd666ecd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-crossbeam-queue
 * [new ref]         265996eb680a1c0e976fc34881e7647bcd666ecd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 265996e Update to version 0.3.11; Fixes RHBZ#2257263