$ git clone -n https://src.fedoraproject.org/rpms/mingw-libmng.git /var/lib/mock/f41-build-1022394-18070/root/chroot_tmpdir/scmroot/mingw-libmng
Cloning into '/var/lib/mock/f41-build-1022394-18070/root/chroot_tmpdir/scmroot/mingw-libmng'...
$ git fetch origin 13bc3b6681e1cc5d205d6cf5057e10d8e6abfb3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-libmng
 * [new ref]         13bc3b6681e1cc5d205d6cf5057e10d8e6abfb3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13bc3b6 Eliminate use of obsolete %patchN syntax (#2283636)