$ git clone -n https://src.fedoraproject.org/rpms/rust-directories4.git /var/lib/mock/f38-build-side-43-rust-devel-1421805-31465/root/chroot_tmpdir/scmroot/rust-directories4
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1421805-31465/root/chroot_tmpdir/scmroot/rust-directories4'...
$ git fetch origin d4f741fb9af5fce51f8a23aed08ffbbb188a4544:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-directories4
 * [new ref]         d4f741fb9af5fce51f8a23aed08ffbbb188a4544 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d4f741f Initial import (directories 4 compat package)