[darcs-devel] [issue2091] darcs put => _darcs/index: mmap of '_darcs/index' failed: invalid argument(VirtualBox shared folders) (2.5.2)

[Petr Ročkai]

Petr Ročkai <me at mornfall.net> added the comment:

Well, the problem is that virtualbox shared folders are a pretty bad 
implementation of an already bad filesystem interface. I don't think we 
can do anything about this: memory-mapping drives on virtualbox shared 
folders simply does not work. The only alternative is to read the index 
into memory with "read". Since virtualbox shares is about the only 
filesystem with any non-negligible amount of use that fails to support 
memory mapping, there isn't enough pressure to implement alternative 
index reading code just for this single case. I believe even standard 
network shares on windows do work (there may be other bugs, but memory 
mapping should be OK).

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<http://bugs.darcs.net/issue2091>
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