[Nix-dev] Nix SQLite branch merged

[Michael Raskin]

>Whenever something is downloaded from hydra, the files are padded to
>some multiple of power-of-two by zero bytes (!) which causes a lot of
>trouble.
>I'm using regular NixOS from trunk. The whole system is on Btrfs, but
>I don't think that should be a problem.

But it is.

I am a BtrFS user myself and I had this problem once; Eelco was kind 
enough to agree not to remove the semi-fix/semi-workaround from Nix 
trunk, but it may never have made its way to SQLite branch. Linux 
kernel 2.6.37 has BtrFS version with this problem fixed in FS itself.

glibc relies on FS implementing fallocate call just like POSIX 
posix_fallocate is described. Linux kernel promises only that 
fallocate call is something that allows to build posix_fallocate
upon it. POSIX makes compliance with posix_fallocate description
required at libc-level. 

Early BtrFS versions had so many problems that BtrFS devs rejected 
my bug report because of lack of clarity _what_ FS has to provide.
Later, when stability and space usage issues became less pressing,
the accepted this as a bug and fixed that (by that time it was 
reasonable to fix such "small" bugs).