$ git clone -n https://src.fedoraproject.org/rpms/rust-spin_sleep.git /var/lib/mock/f42-build-side-1-3585857-46908/root/chroot_tmpdir/scmroot/rust-spin_sleep
Cloning into '/var/lib/mock/f42-build-side-1-3585857-46908/root/chroot_tmpdir/scmroot/rust-spin_sleep'...
$ git fetch origin 0618ff1c2f971fdffaae9734ce2ddf660b057c33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-spin_sleep
 * [new ref]         0618ff1c2f971fdffaae9734ce2ddf660b057c33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0618ff1 Update to version 1.3.2; Fixes RHBZ#2372919