$ git clone -n https://src.fedoraproject.org/rpms/petsc.git /var/lib/mock/f40-build-2501620-61685/root/chroot_tmpdir/scmroot/petsc
Cloning into '/var/lib/mock/f40-build-2501620-61685/root/chroot_tmpdir/scmroot/petsc'...
$ git fetch origin 01bee9cb0eb13437a4085d75d1454ac2f737757d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/petsc
 * [new ref]         01bee9cb0eb13437a4085d75d1454ac2f737757d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01bee9c Move up patch #8