$ git clone -n https://src.fedoraproject.org/rpms/gflags.git /var/lib/mock/f45-build-9801-409/root/chroot_tmpdir/scmroot/gflags
Cloning into '/var/lib/mock/f45-build-9801-409/root/chroot_tmpdir/scmroot/gflags'...
$ git fetch origin 60cc7b2489605b5937a7e9a75615104a7ef448c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gflags
 * [new ref]         60cc7b2489605b5937a7e9a75615104a7ef448c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 60cc7b2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild