On 12/05/16 21:05, Alan Belew wrote:
I have a few questions on the trickery nix uses in its package system.
1. whenever nix builds a package from source, how does it make sure
all the outputs end up in a folder in the store?
It does not. When compilation ends with a success code, everything in
the store path /is/ the output.
2. how does nix make sure that programs can find the libraries they
need? from what i read i got the impression that nix puts symlinks to
the store in lib /lib or /usr/lib directories, but i can't find
anything like that on my os.
This is explained roughly in https://nixos.org/nix/about.html.
Executables are linked agains library paths like
/nix/store/<hash>-foo-lib/lib/libfoo.so .
That path is recorded in the generated executable and used at runtime.
Default paths are not searched at compilation nor at runtime.
The symlinks in /run/current-system/sw/{bin,lib,...} are only provided
by NixOS, for some use cases where it is easier to have them gathered
that way.
For example, it is easier to have the executables at the same place to
point your PATH to.
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