$ git clone -n https://src.fedoraproject.org/rpms/rust-difftastic.git /var/lib/mock/f40-build-781295-131566/root/chroot_tmpdir/scmroot/rust-difftastic
Cloning into '/var/lib/mock/f40-build-781295-131566/root/chroot_tmpdir/scmroot/rust-difftastic'...
$ git fetch origin edd318ddeb0329ecdf09067eb0323f3b435b0566:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-difftastic
 * [new ref]         edd318ddeb0329ecdf09067eb0323f3b435b0566 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at edd318d Update to 0.55.0 (fixes: rhbz#2262305)