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Trivial changes from the lazy-trees branch
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Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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refactor rendering documentation of options
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this avoids incorrect rendering on the man pages, since `lowdown`
neither parses the anchor syntax nor HTML.
this should rather be fixed in lowdown, as adding more anchors
would otherwise produce ever more noise and error-prone repetition.
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These only functioned if a very narrow combination of conditions held:
- The result path does not yet exist (--check did not result in
repeated builds), AND
- The result path is not available from any configured substituters, AND
- No remote builders that can build the path are available.
If any of these do not hold, a derivation would be built 0 or 1 times
regardless of the repeat option. Thus, remove it to avoid confusion.
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after discussing this with multiple people, I'm convinced that "build
task" is more precise: a derivation is not an action, but inert until it
is built. also it's easier to pronounce.
proposal: use "build task" for the generic concept "description of how
to derive new files from the contents of existing files". then it will
be easier to distinguish what we mean by "derivation" (a specific data
structure and Nix language value type) and "store derivation" (a
serialisation of a derivation into a file in the Nix store).
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it is out of date, all over the place in level of detail, is really
about `nixpkgs`, and in general instructions should not be part of
a reference manual.
also:
- update redirects and internal links
- use "Nix language" consistently
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This should help future lost newcomers like myself understand where to
find the docs for both of these commands and how they differ.
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Added using the following sed scripts:
- For command-ref/opt-common.md:
s~- `(--?)([^`]+)`~- [`\1\2`]{#opt-\2}~g
- For expressions/builtin-constants.md:
s~- `(builtins\.?)([^`]+)`~- [`\1\2`]{#builtins-\2}~g
- For expressions/advanced-attributes.md
s~^ - `([^`]+)`~ - [`\1`]{#adv-attr-\1}~g
and manually adjusted outputHashAlgo & outputHashMode.
- For glossary.md
s~^ - (`([^`]+)`|(.+)) ?\\~ - [\1]{#gloss-\2\3}\\~g;
s~(gloss-\w+) ~\1-~g
and manually adjusted anchors for Nix expression, user environment, NAR, ∅ and ε.
- For command-ref/env-common.md
s~^ - `([^`]+)`~ - [`\1`]{#env-\1}~g'
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Make it explicit that it only includes the existing outputs and not the ones that haven’t been realised
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Source: https://github.com/NixOS/nix/blob/067076287bf601f8fa2ffe4feff3057b96fa5be8/src/nix-build/nix-build.cc#L362-L381
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doc: De-emphasize nix-env without -A
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The manual uses `nix-env -i` without `-A` prominently, teaching a bad practice to newcomers.
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According to XDG Base Directory Specification,
it should fall back to /etc/xdg when the env var is not present.
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This is in line with XDG Base Directory Specification, where ~/.config is supposed to be used when XDG_CONFIG_HOME is unset.
It also better matches the reality, where ~/.config/nix.conf does not seem to be used.
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The previous wording seemed to imply that the "channel:" syntax would resolve to
a github archive URL, which is not the case.
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This behaviour was removed in 65f6d5db6f5ef2724a3dc03e1773c510123287f1.
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They are equivalent according to
<https://spec.commonmark.org/0.29/#hard-line-breaks>,
and the trailing spaces tend to be a pain (because the make git
complain, editors tend to want to remove them − the `.editorconfig`
actually specifies that − etc..).
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Fixes #4671.
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`--no-build-hook` appears to have been removed in 25f32625e2f2a3a1e1b3a3811da82f21c3a3b880
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Co-authored-by: Cole Helbling <cole.e.helbling@outlook.com>
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http://nixos.org redirects to https://nixos.org and apparently the HTTP library doesn't follow the redirect, so the output is empty.
When defining https in the request it crashes because the library doesn't seem to support https.
So this switches the example to a different http library.
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Nix shell doc
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Use "run" to avoid confusion with Nix evaluation.
"evaluated" was intended to reference bash eval but it's ambiguous.
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This removes the extra-substituters and extra-sandbox-paths settings
and instead makes every array setting extensible by setting
"extra-<name> = <value>" in the configuration file or passing
"--<name> <value>" on the command line.
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This was accidentally documented as NIX_OPTIONS.
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Closes #4096.
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pkgs.fetchurl supports an executable argument, which is especially nice
when downloading a large executable. This patch adds the same option to
nix-prefetch-url.
I have tested this to work on the simple case of prefetching a little
executable:
1. nix-prefetch-url --executable https://my/little/script
2. Paste the hash into a pkgs.fetchurl-based package, script-pkg.nix
3. Delete the output from the store to avoid any misidentified artifacts
4. Realise the package script-pkg.nix
5. Run the executable
I repeated the above while using --name, as well.
I suspect --executable would have no meaningful effect if combined with
--unpack, but I have not tried it.
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All GC roots are now indirect.
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This means we don't have two (divergent) sets of option descriptions
anymore.
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