$ git clone -n https://src.fedoraproject.org/rpms/rust-test-case1.git /var/lib/mock/f38-build-side-43-rust-devel-1418426-31459/root/chroot_tmpdir/scmroot/rust-test-case1
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1418426-31459/root/chroot_tmpdir/scmroot/rust-test-case1'...
$ git fetch origin 7e48fce6793e639d64fb992c120a4eb2b93d9141:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-case1
 * [new ref]         7e48fce6793e639d64fb992c120a4eb2b93d9141 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e48fce Initial import (test-case 1 compat package)