$ git clone -n https://src.fedoraproject.org/rpms/rust-parking_lot_core.git /var/lib/mock/f40-build-2073482-49358/root/chroot_tmpdir/scmroot/rust-parking_lot_core
Cloning into '/var/lib/mock/f40-build-2073482-49358/root/chroot_tmpdir/scmroot/rust-parking_lot_core'...
$ git fetch origin 6e7fed2b8e21ef42136a2aa5ce181a3c2175181b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-parking_lot_core
 * [new ref]         6e7fed2b8e21ef42136a2aa5ce181a3c2175181b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e7fed2 Update to version 0.9.9; Fixes RHBZ#2244733