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This forces us to be explicit.
It also requires to rework how `from_json` works. A `JSON_IMPL` is added
to assist with this.
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`DerivedPath::Built` and `DerivationGoal` were previously using a
regular set with the convention that the empty set means all outputs.
But it is easy to forget about this rule when processing those sets.
Using `OutputSpec` forces us to get it right.
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Do this prior to making a new more limitted `OutputPath` we will use in
more places.
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A few little changes preparing for the rest.
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Prior to this change, we had a bunch of ad-hoc string manipulation code
scattered around. This made it hard to figure out what data model for
string contexts is.
Now, we still store string contexts most of the time as encoded strings
--- I was wary of the performance implications of changing that --- but
whenever we parse them we do so only through the
`NixStringContextElem::parse` method, which handles all cases. This
creates a data type that is very similar to `DerivedPath` but:
- Represents the funky `=<drvpath>` case as properly distinct from the
others.
- Only encodes a single output, no wildcards and no set, for the
"built" case.
(I would like to deprecate `=<path>`, after which we are in spitting
distance of `DerivedPath` and could maybe get away with fewer types, but
that is another topic for another day.)
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- Add a comment
- Put `OutputsSpec` in a different header (First part of #6815)
- Make a few stray uses of it in new code use `DerivedPath` instead.
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NixOS modules can be paths. Rather than dig further down into the layer
violation, don't check anything specific to NixOS modules.
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Fix `nix why-depends --derivation`
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This has the same goal as b13fd4c58e81b2b2b0d72caa5ce80de861622610,but
achieves it in a different way in order to not break
`nix why-depends --derivation`.
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This reverts commit b13fd4c58e81b2b2b0d72caa5ce80de861622610.
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define "store derivation"
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This makes 'nix develop' set the Linux personality in the same way
that the actual build does, allowing a command like 'nix develop
nix#devShells.i686-linux.default' on x86_64-linux to work correctly.
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a store derivation is not a store path itself, it has a store path.
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toDerivedPaths() now returns DerivedPathWithInfo, which is DerivedPath
with some attributes needed by 'nix profile' etc.
Preparation for #7417.
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Add anchors and links to definition
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Thanks!
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
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https://hydra.nixos.org/log/mcgypcf9vj4n8vdmw7lj3l05c899v73w-nix-2.12.0pre20221201_16b03f0-x86_64-unknown-linux-musl.drv
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Fixes
error: [json.exception.type_error.301] cannot create object from initializer list
in tests/fetchClosure.sh.
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Automatic UID allocation
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Replace src/libutil/json.cc with nlohmann
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Fix why-depends for CA derivations
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why-depends assumed that we knew the output path of the second argument.
For CA derivations, we might not know until it's built. One way to solve
this would be to build the second installable to get the output path.
In this case we don't need to, though. If the first installable (A)
depends on the second (B), then getting the store path of A will
necessitate having the store path B. The contrapositive is, if the store
path of B is not known (i.e. it's a CA derivation which hasn't been
built), then A does not depend on B.
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Example:
# nix build -L --extra-experimental-features cgroups --impure --expr 'with import <nixpkgs> {}; runCommand "foo" {} "dd if=/dev/urandom bs=1M count=1024 | md5sum; mkdir $out"' --json
[
{
"cpuSystem": 1.911431,
"cpuUser": 1.214249,
"drvPath": "/nix/store/xzdqz67xba18hljhycp0hwfigzrs2z69-foo.drv",
"outputs": {
"out": "/nix/store/rh9mc9l2gkpq8kn2sgzndr6ll7ffjh6l-foo"
},
"startTime": 1669024076,
"stopTime": 1669024079
}
]
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Example:
# nix build -L --extra-experimental-features cgroups --impure --expr 'with import <nixpkgs> {}; runCommand "foo" {} "dd if=/dev/urandom bs=1M count=1024 | md5sum; mkdir $out"' --json
[
{
"cpuSystem": 1.911431,
"cpuUser": 1.214249,
"drvPath": "/nix/store/xzdqz67xba18hljhycp0hwfigzrs2z69-foo.drv",
"outputs": {
"out": "/nix/store/rh9mc9l2gkpq8kn2sgzndr6ll7ffjh6l-foo"
},
"startTime": 1669024076,
"stopTime": 1669024079
}
]
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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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Move savedArgv into libmain
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`savedArgv` is not accessible by plugins when defined in main binary.
Moving it into one of the nix lib fix the problem.
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Fix `nix __build-remote`
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