[CMake] cpack ZIP generator fails if source file is readonly

[Bruce Cartland]

I'm upgrading my build from 2.8.8 to the latest toolset.

At this stage I've only tried on Windows 2008 Server R2 Standard SP1 and
Windows Server 2003 R2 SP2 (my Linux/Mac boxes are currently broken).

The particular part which fails is packaging the source - which uses the
ZIP generator

cpack --config ./CPackSourceConfig.cmake --verbose

If I re-install cmake/cpack 2.8.8, it works.

cpack 2.8.9 and above (I've tried a number of releases including the
latest 2.8.12.2) results in "CPack Error: Problem copying file: ........"

If I make the source files writeable, then everything works.

Is this a known issue or can I report a bug?

Regards