In reply to @dre:imad.nyc
Unless I'm confused, I meant in the nix repo, where is system as a flag that can be accepted defined. For example, man nix.conf tells me that it takes allow-unsafe-native-code-during-evaluation as a flag, which is defined here: https://github.com/NixOS/nix/blob/32becc87fef7340600df75ffed6e7c6bc56aa827/src/libexpr/eval-settings.hh#L54

In reply to @dre:imad.nyc
Do you think you could point me to the entrypoint for --help in nix3 commands? I see showManPage, but as far as I can tell that's just nix2

In reply to @connorbaker:matrix.org
As I've been working on the persistent lists PR, I've been thinking about the data structures we use currently for lists and attribute sets. Lists: https://github.com/NixOS/nix/blob/0498e2259a0e6ae2f6e121579d35ace79c5b3ef2/src/libexpr/value.hh#L136 Attribute sets: https://github.com/NixOS/nix/blob/0498e2259a0e6ae2f6e121579d35ace79c5b3ef2/src/libexpr/attr-set.hh Has anyone got metrics on what the most commonly used operations are on lists and attribute sets? I'd like to think that we could find out what operations we need to make cheap and select a data structure which provides a low cost for those operations.

I used this:

valgrind --tool=callgrind ./build/src/nix/nix eval --file '<nixpkgs/nixos>' system --arg configuration '{boot.isContainer=true;system.stateVersion="24.11";}' --argstr system "x86_64-linux"

and got these graphs: https://github.com/NixOS/nix/issues/9034#issue-1910269659

[nixos@nixos:~]$ nix-shell -p pciutils
error:
       … while calling the 'import' builtin
         at «string»:1:18:
            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (pciutils) ]; } ""
             |                  ^

       … while realising the context of a path

       … while calling the 'findFile' builtin
         at «string»:1:25:
            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (pciutils) ]; } ""
             |                         ^

       error: experimental Nix feature 'flakes' is disabled; add '--extra-experimental-features flakes' to enable it

[nixos@nixos:~]$ nix --version
nix (Nix) 2.24.10

In reply to@matthewcroughan:defenestrate.it

[nixos@nixos:~]$ nix-shell -p pciutils
error:
       … while calling the 'import' builtin
         at «string»:1:18:
            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (pciutils) ]; } ""
             |                  ^

       … while realising the context of a path

       … while calling the 'findFile' builtin
         at «string»:1:25:
            1| {...}@args: with import <nixpkgs> args; (pkgs.runCommandCC or pkgs.runCommand) "shell" { buildInputs = [ (pciutils) ]; } ""
             |                         ^

       error: experimental Nix feature 'flakes' is disabled; add '--extra-experimental-features flakes' to enable it

In reply to @matthewcroughan:defenestrate.it
Does this mean that Nix just doesn't work out of the box now because of flakes? Or have I misconfigured something?

this is probably this bug https://github.com/NixOS/nixpkgs/issues/292465

effectively it is that if you build a nixos config with flakes it won't enable flakes in the resulting system.

this would be literally a 1 line change to fix and ive just not got around to it. you just need to make nixpkgs.flake.source set flakes to be enabled

In reply to @matthewcroughan:defenestrate.it

got this for the first time today

nixinate-phone> building '/nix/store/z03lxdp085hqpaxglqm7iphvdsvcdgvs-cardinal-24.09.drv'...
nixinate-phone> bad JSON log message from builder: [json.exception.parse_error.101] parse error at line 1, column 4099: syntax error while parsing array - invalid literal; last read: '"\u001b[01m\u001b[K/nix/store/pxb3zpbg0qdccadh884fag33va0xb4ds-gcc-13.3.0/include/c++/13.3.0/variant:1522:33:\u001b[m\u001b[K   required from '\u001b[01m\u001b[Kstd::enable_if_t<(is_constructible_v<_Tp, _Args ...> && __exactly_once<_Tp>), _Tp&> std::variant<_Types>::\u001b[01;32m\u001b[Kemplace\u001b[m\u001b[K(_Args&& ...) \u001b[35m\u001b[K[with _Tp = RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >; _Args = {}; _Types = {NullModel, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 16, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 16, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 16, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 16, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 16, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 16, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 20, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 20, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 20, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 20, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 20, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 20, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 40, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 40, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 40, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 40, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 40, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 40, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 64, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 64, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 64, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 64, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 64, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 64, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::LSTMLayerT<float, 1, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::LSTMLayerT<float, 2, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::LSTMLayerT<float, 3, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::LSTMLayerT<float, 1, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT@nix {"a'; expected ']'

In reply to @matthewcroughan:defenestrate.it

got this for the first time today

nixinate-phone> building '/nix/store/z03lxdp085hqpaxglqm7iphvdsvcdgvs-cardinal-24.09.drv'...
nixinate-phone> bad JSON log message from builder: [json.exception.parse_error.101] parse error at line 1, column 4099: syntax error while parsing array - invalid literal; last read: '"\u001b[01m\u001b[K/nix/store/pxb3zpbg0qdccadh884fag33va0xb4ds-gcc-13.3.0/include/c++/13.3.0/variant:1522:33:\u001b[m\u001b[K   required from '\u001b[01m\u001b[Kstd::enable_if_t<(is_constructible_v<_Tp, _Args ...> && __exactly_once<_Tp>), _Tp&> std::variant<_Types>::\u001b[01;32m\u001b[Kemplace\u001b[m\u001b[K(_Args&& ...) \u001b[35m\u001b[K[with _Tp = RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >; _Args = {}; _Types = {NullModel, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 16, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 16, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 16, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 16, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 16, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 16, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 20, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 20, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 20, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 20, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 20, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 20, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 32, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 32, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 40, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 40, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 40, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 40, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 40, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 40, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::GRULayerT<float, 1, 64, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 64, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::GRULayerT<float, 2, 64, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 64, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::GRULayerT<float, 3, 64, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 64, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::LSTMLayerT<float, 1, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 2, 1, RTNeural::LSTMLayerT<float, 2, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 3, 1, RTNeural::LSTMLayerT<float, 3, 8, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 8, 1> >, RTNeural::ModelT<float, 1, 1, RTNeural::LSTMLayerT<float, 1, 12, RTNeural::SampleRateCorrectionMode::None>, RTNeural::DenseT<float, 12, 1> >, RTNeural::ModelT@nix {"a'; expected ']'

Is meson build system on nix-2.25 intended to be used to buix nix on systems that don't yet have nix running? If it is how do you pass options to subprojects from the top level? This seems to fail (the option is in src/libstore/meson.options):

$ meson setup .. -Dsandbox-shell=/bin/sh
...
../meson.build:4:0: ERROR: Unknown options: "sandbox-shell"

In reply to @trofi:matrix.org
nix-2.25.0 does not build against latest release of libgit2 as src/libfetchers/git-utils.cc:288:13: error: ‘git_mempack_write_thin_pack’ was not declared in this scope. It looks like it depends on unreleased feature: https://github.com/libgit2/libgit2/commit/f9c35fb50998d1c9d26293a18ade3d7c32f6ecb0. Is it intentional? I would hope for a silently disabled feature rather than hard build failure.

Is meson build system on nix-2.25 intended to be used to buix nix on systems that don't yet have nix running? If it is how do you pass options to subprojects from the top level? This seems to fail (the option is in src/libstore/meson.options):

$ meson setup .. -Dsandbox-shell=/bin/sh
...
../meson.build:4:0: ERROR: Unknown options: "sandbox-shell"

UPDATE: meson setup .. -Dlibstore:sandbox-shell=/bin/sh does work (https://mesonbuild.com/Subprojects.html)

In reply to @p14:matrix.org
I have nix build going in a loop and I'm unable to ctrl-C it. :(. It's just doing a lot of time in 'getting git revision count of /path/to/nixpkgs', and if the process gets killed, it just goes straight into the next nix build and my shell isn't having a change to see the CTRL-C for the shell while loop.

In reply to @joerg:thalheim.io
Try nix build -f . instead.

In reply to @joerg:thalheim.io
Robert Hensing (roberth): did you not fix some json parsing error the other day?