$ git clone -n https://src.fedoraproject.org/rpms/rust-procfs.git /var/lib/mock/f38-build-side-42-init-devel-1394883-31050/root/chroot_tmpdir/scmroot/rust-procfs
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1394883-31050/root/chroot_tmpdir/scmroot/rust-procfs'...
$ git fetch origin ef1c73225e11e6e1ca49dddc18fd7b54bbf69257:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-procfs
 * [new ref]         ef1c73225e11e6e1ca49dddc18fd7b54bbf69257 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef1c732 Update to 0.15.1