makeOverridable is very careful to ensure the arguments to the
overridden function are the same as the input function. As a result,
the arguments of hello.override are exactly the same as the original
arguments of the hello function that produced the derivation.
However, callPackagesWith calls makeOverridable with a lambda that
does not propagate the arguments. The override function for a package
instantiated with callPackagesWith will not have the original
arguments.
For example:
nix-repl> lib.functionArgs hello.override
{ callPackage = false; fetchurl = false; hello = false; lib = false; nixos = false; stdenv = false; testers = false; }
nix-repl> lib.functionArgs openssl.override
{ }
By copying the arguments onto the inner lambda before passing it to
makeOverridable, we can make callPackage and callPackages behave the
same.
nix-repl> lib.functionArgs openssl.override
{ buildPackages = false; coreutils = false; cryptodev = false; enableSSL2 = true; enableSSL3 = true; fetchurl = false; lib = false; perl = false; removeReferencesTo = false; static = true; stdenv = false; withCryptodev = true; withPerl = true; }
This was found when trying to run the fileset tests on Darwin
(https://github.com/NixOS/nix/pull/9546#issuecomment-1967409445), which mysteriously fail on Darwin:
test case at lib/fileset/tests.sh:342 failed: toSource { root = "/nix/store/foobar"; fileset = ./.; } should have errored with this regex pattern:
lib.fileset.toSource: `root` \(/nix/store/foobar\) is a string-like value, but it should be a path instead.
\s*Paths in strings are not supported by `lib.fileset`, use `lib.sources` or derivations instead.
but this was the actual error:
error: lib.fileset.toSource: `root` (/nix/store/foobar) is a string-like value, but it should be a path instead.
Paths in strings are not supported by `lib.fileset`, use `lib.sources` or derivations instead.
After dissecting this, I find out that apparently \s works on Linux, but not on Darwin for some reason!
From the bash source code, it looks like <regex.h> with `REG_EXTENDED` is used for all platforms the same,
so there's nothing odd there.
It's almost impossible to know where <regex.h> comes from,
but it looks to be a POSIX thing.
So after digging through the almost impossible to find POSIX specifications
(https://pubs.opengroup.org/onlinepubs/007908799/xbd/re.html#tag_007_003_005),
I can indeed confirm that there's no mention of \s or the like!
_However_, there is a mention of `[[:blank:]]`, so we'll use that instead.
The previous code was optimized for the old uniq behavior, which did not
call merge. That's changed, so the legacy path is not a hot path anymore,
and is not worth any tech debt.
The deprecation warnings in lib were wildly inconsistent. Different
formulations were used in different places for the same meaning. Some warnings
used builtins.trace instead of lib.warn, which prevents silencing; one even
only had a comment instead. Make everything more uniform.
This allows for adding new, conditionally set, derivation attributes
to an existing derivation without changing any output paths in the
case where the condition is not met.
The only reason shallow clones are not the default in
`builtins.fetchGit` is that `revCount` can't be provided when cloning a
shallow repository. However, `revCount` isn't used or exposed by
`lib.fileset`. Hence, allowing cloning shallow repositories makes
`gitTracked` more general without any drawbacks.
Co-authored-by: Silvan Mosberger <github@infinisil.com>
It is useful that all (or almost all) .nix files in nixpkgs at least
parse since it allows for checking syntax in the repository
programmatically without evaluating anything.
This doesn't change uniq. Why not?
- In NixOS it seems that uniq is only used with
simple types that are fully checked by t.check.
- It exists for much longer and is used more widely.
- I believe we should deprecate it, because unique was
already better.
- unique can be a proving ground.
According to the WebAssembly design doc, wasm32 is an ILP32 ABI like
x32, mips64n32, and aarch64_ilp32 (Apple Watch). This commits adds
it to the predicate.
1319968ca5/CAndC%2B%2B.md (L16)
