$ git clone -n https://src.fedoraproject.org/rpms/rust-diesel.git /var/lib/mock/f41-build-side-1-2757634-31454/root/chroot_tmpdir/scmroot/rust-diesel
Cloning into '/var/lib/mock/f41-build-side-1-2757634-31454/root/chroot_tmpdir/scmroot/rust-diesel'...
$ git fetch origin 9bcfcc24efa16705b9c1bd8ca98ad47ece806490:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-diesel
 * [new ref]         9bcfcc24efa16705b9c1bd8ca98ad47ece806490 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9bcfcc2 Update to version 2.2.4; Fixes RHBZ#2307520