21628f7ad4
Change-Id: I2008d4d5d92dc02f3955828ba93f748282948f07 Reviewed-on: https://cl.snix.dev/c/snix/+/30447 Autosubmit: Florian Klink <flokli@flokli.de> Reviewed-by: Vova Kryachko <v.kryachko@gmail.com> Tested-by: besadii
3 KiB
| title | slug | description | summary | date | lastmod | draft | weight | toc |
|---|---|---|---|---|---|---|---|---|
| Version history | lang-version | 2025-05-01T13:10:37+02:00 | 2025-05-01T13:10:37+02:00 | false | 50 | false |
The Nix language (“Nix”) has its own versioning mechanism independent from its
most popular implementation (“C++ Nix”): builtins.langVersion. It has been
increased whenever the language has changed syntactically or semantically in a
way that would not be introspectable otherwise. In particular, this does not
include addition (or removal) of builtins, as this can be introspected using
standard attribute set operations.
Changes to builtins.langVersion are best found by viewing the git history of
C++ Nix using git log -G 'mkInt\\(v, [0-9]\\)' for builtins.langVersion < 7.
After that point git log -G 'v\\.mkInt\\([0-9]+\\)' should work. To reduce the
amount of false positives, specify the version number you are interested in
explicitly.
1
The first version of the Nix language is its state at the point when
builtins.langVersion was added in 8b8ee53 which was first released
as part of C++ Nix 1.2.
2
Nix version 2 changed the behavior of builtins.storePath: It would now try to
substitute the given path if missing, instead of creating
an evaluation failure. builtins.langVersion was increased in e36229d.
3
Nix version 3 changed the behavior of the == behavior. Strings would now be
considered equal even if they had differing string context.
4
Nix version 4 added the float type to the language.
5
The increase of builtins.langVersion to 5 did not signify a
language change, but added support for structured attributes to the Nix daemon.
Eelco Dolstra writes as to what changed:
The structured attributes support. Unfortunately that's not so much a language change as a build.cc (i.e. daemon) change, but we don't really have a way to express that...
Maybe builtins.nixVersion (which was added in version 1) should have been
used instead. In any case, the only langVersion check
in nixpkgs verifies a lower bound of 5.
6
Nix version 6 added support for comparing two lists.