$ git clone -n https://src.fedoraproject.org/rpms/rust-diesel.git /var/lib/mock/f38-build-side-43-rust-devel-1397674-31053/root/chroot_tmpdir/scmroot/rust-diesel
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397674-31053/root/chroot_tmpdir/scmroot/rust-diesel'...
$ git fetch origin 94f68f0f7d3261ce14e4282857e6d1d869035da3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-diesel
 * [new ref]         94f68f0f7d3261ce14e4282857e6d1d869035da3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94f68f0 Update to version 2.1.1; Fixes RHBZ#2234656