Add a derefPath function that copies a path to the store #37730
Conversation
This function will copy a path to the nix store. The difference with
using `src = ./.` is how symbolic links are handled. Nix normally just copies those links as-is into the store.
This function can be used to dereference all symbolic links.
```
{ stdenv, derefPath }:
stdenv.mkDerivation rec {
name = "hello";
src = derefPath {
name = "${name}-src";
src = ./.;
};
}
```
This is a quick and dirty fix for the following issues in `NixOS/nix`:
* NixOS/nix#1232
* NixOS/nix#897
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I'm having trouble composing this with if lib.inNixShell
then null
else lib.flip lib.sourceFilesBySuffices tex_exts (derefPath {
name = "${name}-src";
src = ./.;
});yields Any tips? Am I doing this wrong, or is there a way to improve the compositionality of this function? Also, some documentation might be good! EDIT: I can confirm that this does work well for its intended purpose. Thank you for sharing! EDIT 2: There's actually one other small issue: when the content backing the symlink is updated, Nix doesn't notice and rebuild |
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@peti Does this seem like a decent first step to dealing with NixOS/nix#897 and NixOS/nix#1232 to you? |
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Though, I think this might not work correctly with sandboxing, because it creates a derivation which the sandboxed builder runs and tries to |
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Disadvantage of course is that it has two copy stuff twice. |
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I don't understand the name. "Dereferencing a path" means something like Also this would be better to handle in Nix (maybe as a flag to |
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Yeah. Something like |
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I don't think this should be part of nixpkgs. This of course nobody stops it from copying the function into their own projects. |
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there: https://discourse.nixos.org/t/how-to-stop-nix-from-unpacking-a-directory/6866/4 |
This function will copy a path to the nix store. The difference with
using
src = ./.is how symbolic links are handled. Nix normally just copies those links as-is into the store.This function can be used to dereference all symbolic links.
Example
This is a quick and dirty fix for the following issues in
NixOS/nix:Things done
build-use-sandboxinnix.confon non-NixOS)nix-shell -p nox --run "nox-review wip"./result/bin/)