[darcs-devel] [issue1753] darcs: opening of '_darcs/index' failed: does not exist (No such file or directory)

[Petr Ročkai]

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

(1) Darcs with -f-mmap works just fine.
(2) I have never blessed the mmap-0.5 patch for hashed-storage. It's not 
even in HEAD, not to say anything about released versions of h-s. 
(Although I have used it locally without issues for a while.)
(3) If cabal happily builds darcs with two different mmap versions 
linked in, that's a cabal bug. By default, that does not happen. I have 
to specify --constraint 'mmap > 0.5' to darcs's configure to get a 
broken binary.

As for the size/offset bug in h-s, good catch -- you are right that the 
size_magic is added redundantly. Nevertheless, from the point of view of 
darcs *working*, this is a harmless bug, just making the index longer 
than strictly necessary.

However, I see that if you are using h-s with mmap-0.5, you have a bogus 
patch for that. Please see http://pastebin.ca/1806460 -- that's the 
patch I sent to Trent and that actually works. From the patch you 
propose, I see you don't have this one, therefore the breakage...

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priority: critical -> urgent

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