$ git clone -n https://src.fedoraproject.org/rpms/emacs-common-proofgeneral.git /var/lib/mock/f45-build-8054-375/root/chroot_tmpdir/scmroot/emacs-common-proofgeneral
Cloning into '/var/lib/mock/f45-build-8054-375/root/chroot_tmpdir/scmroot/emacs-common-proofgeneral'...
$ git fetch origin f844b75351d99b6669a421f7d75549c082d8fe83:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/emacs-common-proofgeneral
 * [new ref]         f844b75351d99b6669a421f7d75549c082d8fe83 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f844b75 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild