$ git clone -n https://src.fedoraproject.org/rpms/ghc-aeson-better-errors.git /var/lib/mock/f45-build-9965-412/root/chroot_tmpdir/scmroot/ghc-aeson-better-errors
Cloning into '/var/lib/mock/f45-build-9965-412/root/chroot_tmpdir/scmroot/ghc-aeson-better-errors'...
$ git fetch origin 7cfca06398cdedde45a2d94e6ccda242865600c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-aeson-better-errors
 * [new ref]         7cfca06398cdedde45a2d94e6ccda242865600c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7cfca06 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild