$ git clone -n https://src.fedoraproject.org/rpms/rust-test-case-core.git /var/lib/mock/f39-build-1678471-40962/root/chroot_tmpdir/scmroot/rust-test-case-core
Cloning into '/var/lib/mock/f39-build-1678471-40962/root/chroot_tmpdir/scmroot/rust-test-case-core'...
$ git fetch origin 1f6533b9a9787d6386f729ea8d71588300b8040f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-case-core
 * [new ref]         1f6533b9a9787d6386f729ea8d71588300b8040f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f6533b Initial import (#2242771)