$ git clone -n https://src.fedoraproject.org/rpms/mingw-gcc.git /var/lib/mock/f41-build-860714-169164/root/chroot_tmpdir/scmroot/mingw-gcc
Cloning into '/var/lib/mock/f41-build-860714-169164/root/chroot_tmpdir/scmroot/mingw-gcc'...
$ git fetch origin c7dc1ac71111b266467eb98b41ca9946e68c3ea6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-gcc
 * [new ref]         c7dc1ac71111b266467eb98b41ca9946e68c3ea6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c7dc1ac Rebuild on fixed mingw-crt