$ git clone -n https://src.fedoraproject.org/rpms/rust-zerocopy.git /var/lib/mock/f42-build-side-1-3533369-46361/root/chroot_tmpdir/scmroot/rust-zerocopy
Cloning into '/var/lib/mock/f42-build-side-1-3533369-46361/root/chroot_tmpdir/scmroot/rust-zerocopy'...
$ git fetch origin 57e6fc993ae8930de60ceb648002c74b6183cb8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-zerocopy
 * [new ref]         57e6fc993ae8930de60ceb648002c74b6183cb8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57e6fc9 Update to version 0.8.25; Fixes RHBZ#2350137