$ git clone -n https://src.fedoraproject.org/rpms/rust-test-case2.git /var/lib/mock/f38-build-side-43-rust-devel-1419550-31460/root/chroot_tmpdir/scmroot/rust-test-case2
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1419550-31460/root/chroot_tmpdir/scmroot/rust-test-case2'...
$ git fetch origin 496a73fd2f4a2fb4f7612fe19d4e748c49545056:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-case2
 * [new ref]         496a73fd2f4a2fb4f7612fe19d4e748c49545056 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 496a73f Added the README