$ git clone -n https://src.fedoraproject.org/rpms/rust-diff.git /var/lib/mock/f39-build-1516986-35671/root/chroot_tmpdir/scmroot/rust-diff
Cloning into '/var/lib/mock/f39-build-1516986-35671/root/chroot_tmpdir/scmroot/rust-diff'...
$ git fetch origin e15cf9974e3f169bc496bc04f0ebfb1e605944bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-diff
 * [new ref]         e15cf9974e3f169bc496bc04f0ebfb1e605944bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e15cf99 Regenerate with rust2rpm v24