wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-25 06:31:14 +02:00
Code Activity

feat: add always-allow-substitutes

Browse source 
This adds a new configuration option to Nix, `always-allow-substitutes`,
whose effect is simple: it causes the `allowSubstitutes` attribute in
derivations to be ignored, and for substituters to always be used.

This is extremely valuable for users of Nix in CI, where usually
`nix-build-uncached` is used. There, derivations which disallow
substitutes cause headaches as the inputs for building already-cached
derivations need to be fetched to spuriously rebuild some simple text
file.

This option should be a good middle-ground, since it doesn't imply
rebuilding the world, such as the approach I took in
https://github.com/NixOS/nixpkgs/pull/221048
This commit is contained in:
Bernardo Meurer 2023-03-14 11:54:04 -03:00
parent 494a09c6df
commit bf693319f6
No known key found for this signature in database
3 changed files with 12 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

3
doc/manual/src/language/advanced-attributes.md
View file

@ -261,6 +261,9 @@ Derivations can declare some infrequently used optional attributes.
useful for very trivial derivations (such as `writeText` in Nixpkgs)
that are cheaper to build than to substitute from a binary cache.
You may disable the effects of this attibute by enabling the
`always-allow-substitutes` configuration option in Nix.
> **Note**
>
> You need to have a builder configured which satisfies the