$ git clone -n https://src.fedoraproject.org/rpms/rust-crunchy.git /var/lib/mock/f42-build-side-1-3585411-46904/root/chroot_tmpdir/scmroot/rust-crunchy
Cloning into '/var/lib/mock/f42-build-side-1-3585411-46904/root/chroot_tmpdir/scmroot/rust-crunchy'...
$ git fetch origin d4d9bfc8128969127b7d2532debdbb86c50144dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-crunchy
 * [new ref]         d4d9bfc8128969127b7d2532debdbb86c50144dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4d9bfc Update to version 0.2.4; Fixes RHBZ#2374752