$ git clone -n https://src.fedoraproject.org/rpms/petsc.git /var/lib/mock/f40-build-2077642-49573/root/chroot_tmpdir/scmroot/petsc
Cloning into '/var/lib/mock/f40-build-2077642-49573/root/chroot_tmpdir/scmroot/petsc'...
$ git fetch origin 8c5aed103585622930c8b2287ce46b03c7a3a489:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/petsc
 * [new ref]         8c5aed103585622930c8b2287ce46b03c7a3a489 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  75% (9/12)
Updating files:  83% (10/12)
Updating files:  91% (11/12)
Updating files: 100% (12/12)
Updating files: 100% (12/12), done.
HEAD is now at 8c5aed1 Rebuild for superlu_dist-8.2.0