$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-gio.git /var/lib/mock/f40-build-2493755-61664/root/chroot_tmpdir/scmroot/ghc-gi-gio
Cloning into '/var/lib/mock/f40-build-2493755-61664/root/chroot_tmpdir/scmroot/ghc-gi-gio'...
$ git fetch origin 3c491575886f5e80e8ae30bddac3456c4ba4223f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-gio
 * [new ref]         3c491575886f5e80e8ae30bddac3456c4ba4223f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c49157 Add a temporary override to CFLAGS