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Fix documentation of lib.trivial.importJSON and lib.trivial.importTOML
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Revert "lib/trivial: fix 'error: cannot decode virtual path '/nix/sto…
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'/nix/store/virtual0000000000000000000000005-source''"
This reverts commit b67ee6e861903abb04e9024d605dfc7b00922633.
https://github.com/NixOS/nixpkgs/issues/202244
error: a string that refers to a store path cannot be appended to a path, at /etc/nixos/nix/nixos-unstable/lib/sources.nix:193:30
appears to happen when there's a nixpkgs git submodule
> So one of the things that is different for a git submodule is that the .git folder isn't a folder, it's a textfile that contains (in my case) this:
> $ cat nix/nixos-unstable/.git
> gitdir: ../../.git/modules/nixpkgs
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lib/sources: remove 2 usages of toString on a path which will be read using fileContents
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'/nix/store/virtual0000000000000000000000005-source''
happens on lazy-trees branch of Nix (NixOS/nix#6530)
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It gives a warning on the lazy-trees branch of Nix
(NixOS/nix#6530)
one of these was also giving me an error (the one in lib/trivial probably)
```
$ nix build
warning: applying 'toString' to path '/home/artturin/nixgits/my-nixpkgs/nixos/modules/installer/sd-card/sd
-image-aarch64.nix' and then accessing it is deprecated, at /home/artturin/nixgits/my-nixpkgs/lib/modules.
nix:349:99
warning: applying 'toString' to path '/home/artturin/nixgits/my-nixpkgs/.git' and then accessing it is dep
recated, at /home/artturin/nixgits/my-nixpkgs/lib/sources.nix:35:32
warning: applying 'toString' to path '/home/artturin/nixgits/my-nixpkgs/nixos/modules/system/etc/etc.nix'
and then accessing it is deprecated, at «stdin»:0
warning: applying 'toString' to path '/home/artturin/nixgits/my-nixpkgs/nixos/modules/system/etc/etc-activ
ation.nix' and then accessing it is deprecated, at «stdin»:0
warning: applying 'toString' to path '/home/artturin/nixgits/my-nixpkgs/nixos/modules/installer/sd-card/sd
-image-aarch64.nix' and then accessing it is deprecated, at «stdin»:0
error: cannot decode virtual path '/nix/store/virtual0000000000000000000000005-source'
(use '--show-trace' to show detailed location information)
```
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lib: add inPureEvalMode
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This makes a value that is true if builtins does not contain the
currentSystem function, but false if it does.
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nixos/testing: restrict arguments to makeTest
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lib/trivial: add warnIfNot and throwIf
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Negated versions of warnIf and throwIfNot.
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Adds support for sinceRelease
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C-style comment was being picked up by nixdoc as a documentation comment for the function.
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`functionArgs` should give valid results on
functions that have been identified with `lib.isFunction`
instead of erroring out.
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It's a common pattern in Nixpkgs to want to emit a warning in certain
cases, but not actually change behaviours.
This is often expressed as either
if cond then lib.warn "Don't do that thing" x else x
Or
(if cond then lib.warn "Don't do that thing" else lib.id) x
Neither of which really expresses the intent here, because it looks
like 'x' is being chosen conditionally.
To make this clearer, I introduce a "warnIf" function, which makes it
clear that the only thing being affected by the condition is whether
the warning is generated, not the value being returned.
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Complements the `lib.importJSON`. `builtins.readTOML` has been
introduced in Nix 2.1.
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* Okapi is an artiodactyl mammal native to Central Africa
* https://en.wikipedia.org/wiki/Okapi
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This makes the type of these functions more apparent from the name.
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`toHex` converts the given positive integer to a string of the hexadecimal
representation of that integer. For example:
```
toHex 0 => "0"
toHex 16 => "10"
toHex 250 => "FA"
```
`toBase base i` converts the positive integer `i` to a list of it
digits in the given `base`. For example:
```
toBase 10 123 => [ 1 2 3 ]
toBase 2 6 => [ 1 1 0 ]
toBase 16 250 => [ 15 10 ]
```
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Before c9214c394b248e1f26e45dbe1be2bd82363af3a6 and
9d396d2e426b9a765de0b8999aa214f1259633e6 if .git is symlink the version
would gracefully default to no git revision. With those changes an
exception is thrown instead.
This introduces a new function `pathIsGitRepo` that checks if
`commitIdFromGitRepo` fails without error so we don't have to
reimplement this logic again and can fail gracefully.
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lib.commitIdFromGitRepo now resolves the refs from the
parent repository in case the supplied path is a file
containing the path to said repository. this adds support
for git-worktree and things alike. see gitrepository-layout(5).
this also:
- adds a new boolean function lib.pathIsRegularFile to
check whether a path is a regular file
- patches lib.revisionWithDefault and
the revision and versionSuffix attributes in
config.system.nixos in order to support git-worktrees
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`pipe` is a useful operator for creating pipelines of functions.
It works around the usual problem of e.g. string operations becoming
deeply nested functions.
In principle, there are four different ways this function could be
written:
pipe val [ f1 .. fn ]
pipe val [ fn .. f1 ]
compose [ f1 .. fn ] val
compose [ fn .. f1 ] val
The third and fourth form mirror composition of functions, they would
be the same as e.g. `(f1 << f2 << f3 .. << fn) val`.
However, it is not clear which direction the list should have (as one
can see in the second form, which is the most absurd.
In order not to confuse users, we decide for the most “intuitive”
form, which mirrors the way unix pipes work (thus the name `pipe`).
The flow of data goes from left to right.
Co-Authored-By: Silvan Mosberger <infinisil@icloud.com>
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* Markhor is a spiral horned animal that is on the endangered species list
* https://en.wikipedia.org/wiki/Markhor
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isNull "is deprecated; just write e == null instead" says the Nix manual
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https://en.wikipedia.org/wiki/Loris
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this makes the codename globally accessible in the repo. The release is
not only for NixOS anymore.
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Expands on some of the function comments and add some of the
special syntaxes recognised by nixdoc.
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Since the `assertOneOf` uses `lib.generators`, they are not really trivial
anymore and should go into their own library file.
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