$ git clone -n https://src.fedoraproject.org/rpms/rust-git-delta.git /var/lib/mock/f41-build-847137-163736/root/chroot_tmpdir/scmroot/rust-git-delta
Cloning into '/var/lib/mock/f41-build-847137-163736/root/chroot_tmpdir/scmroot/rust-git-delta'...
$ git fetch origin f10e3f02062c37438583789c5cbb8cae03cbc0d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-git-delta
 * [new ref]         f10e3f02062c37438583789c5cbb8cae03cbc0d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f10e3f0 Update to version 0.18.0; Fixes RHBZ#2305313