$ git clone -n https://src.fedoraproject.org/rpms/rust-uluru.git /var/lib/mock/f38-build-side-43-rust-devel-1409551-31402/root/chroot_tmpdir/scmroot/rust-uluru
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1409551-31402/root/chroot_tmpdir/scmroot/rust-uluru'...
$ git fetch origin b1a67fcef2c75b4517de9fe30b8ce9534758ea68:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-uluru
 * [new ref]         b1a67fcef2c75b4517de9fe30b8ce9534758ea68 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1a67fc Initial package (rhbz#2241009)