$ git clone -n https://src.fedoraproject.org/rpms/perl-GooCanvas2-CairoTypes.git /var/lib/mock/f41-build-side-1-2652700-27750/root/chroot_tmpdir/scmroot/perl-GooCanvas2-CairoTypes
Cloning into '/var/lib/mock/f41-build-side-1-2652700-27750/root/chroot_tmpdir/scmroot/perl-GooCanvas2-CairoTypes'...
$ git fetch origin a9529a49b74283a6c0e3ef85f0e4a40b9dca7823:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-GooCanvas2-CairoTypes
 * [new ref]         a9529a49b74283a6c0e3ef85f0e4a40b9dca7823 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a9529a4 convert GPL+ or Artistic license to SPDX