$ git clone -n https://src.fedoraproject.org/rpms/rust-afterburn.git /var/lib/mock/f42-build-side-1-3588319-46944/root/chroot_tmpdir/scmroot/rust-afterburn
Cloning into '/var/lib/mock/f42-build-side-1-3588319-46944/root/chroot_tmpdir/scmroot/rust-afterburn'...
$ git fetch origin 9242098247cea7007928d50f70c17a3f7ad84f88:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-afterburn
 * [new ref]         9242098247cea7007928d50f70c17a3f7ad84f88 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9242098 Update to 5.9.0 upstream release