$ git clone -n https://src.fedoraproject.org/rpms/ghc-regex-tdfa.git /var/lib/mock/f45-build-10678-419/root/chroot_tmpdir/scmroot/ghc-regex-tdfa
Cloning into '/var/lib/mock/f45-build-10678-419/root/chroot_tmpdir/scmroot/ghc-regex-tdfa'...
$ git fetch origin 2b0accff0e178a5328ee7d0fe211a852faa8b90d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regex-tdfa
 * [new ref]         2b0accff0e178a5328ee7d0fe211a852faa8b90d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b0accf Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild