$ git clone -n https://src.fedoraproject.org/rpms/ghc-kan-extensions.git /var/lib/mock/f45-build-10460-418/root/chroot_tmpdir/scmroot/ghc-kan-extensions
Cloning into '/var/lib/mock/f45-build-10460-418/root/chroot_tmpdir/scmroot/ghc-kan-extensions'...
$ git fetch origin 7276668949b7e4b563e727c21010a87769837dd7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-kan-extensions
 * [new ref]         7276668949b7e4b563e727c21010a87769837dd7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7276668 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild