On Fri, 30 May 2014 13:13:07 -0400 Matthew Woehlke <mw_tr...@users.sourceforge.net> wrote:
> That was my assumption also. I would've thought that would be better, > as coreutils basically exists only on Linux. (And even then, someone > could in theory have a different 'cp', though that is unlikely.) > > @Alessandro, would you expect this to ever be used on e.g. a BSD or > OS/X system? Well, in theory it's technically possible, in the sense that e.g. ZFS should allow something like reflinks [1], however I'm not sure if and when this will happen. Moreover, currently there's no FS-independent syscall, there was a proposal [2] but I can't see it implemented in the current Linux kernel. This means that we have to deal directly with ioctl (see actual `cp` implementation [3]), which is something specific per-FS (and per-OS). Moreover we also have to detect the FS. It looks to me a lot work to reinvent what `cp` is already doing, and will be doing in a future-proof way. I'd go for detecting if `cp` is from GNU coreutils and if it's recent enough. If in future some other `cp` implements this we can detect it as well, or if we get an easily usable syscall we can go for it. What do you think? -- Ale [1] https://github.com/zfsonlinux/zfs/issues/405 [2] http://thread.gmane.org/gmane.linux.file-systems/31535 [3] http://bit.ly/1k9rWOd -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers
