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A command like
$ nix run nixpkgs#hello
will now build the attribute 'packages.${system}.hello' rather than
'packages.hello'. Note that this does mean that the flake needs to
export an attribute for every system type it supports, and you can't
build on unsupported systems. So 'packages' typically looks like this:
packages = nixpkgs.lib.genAttrs ["x86_64-linux" "i686-linux"] (system: {
hello = ...;
});
The 'checks', 'defaultPackage', 'devShell', 'apps' and 'defaultApp'
outputs similarly are now attrsets that map system types to
derivations/apps. 'nix flake check' checks that the derivations for
all platforms evaluate correctly, but only builds the derivations in
'checks.${system}'.
Fixes #2861. (That issue also talks about access to ~/.config/nixpkgs
and --arg, but I think it's reasonable to say that flakes shouldn't
support those.)
The alternative to attribute selection is to pass the system type as
an argument to the flake's 'outputs' function, e.g. 'outputs = { self,
nixpkgs, system }: ...'. However, that approach would be at odds with
hermetic evaluation and make it impossible to enumerate the packages
provided by a flake.
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Also fix some gcc warnings.
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If 'input.<name>.uri' changes, then the entry in the lockfile for
input <name> should be considered stale.
Also print some messages when lock file entries are added/updated.
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Also show more position info.
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This is no longer needed since flakes are given an identity in the
'inputs' attribute.
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App / check improvements
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Updated flake documentation
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Also add a proper test for non-flake inputs.
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As long as the flake input is locked, it is now only fetched when it
is evaluated (e.g. "nixpkgs" is fetched when
"inputs.nixpkgs.<something>" is evaluated).
This required adding an "id" attribute to the members of "inputs" in
lockfiles, e.g.
"inputs": {
"nixpkgs/release-19.03": {
"id": "nixpkgs",
"inputs": {},
"narHash": "sha256-eYtxncIMFVmOHaHBtTdPGcs/AnJqKqA6tHCm0UmPYQU=",
"nonFlakeInputs": {},
"uri": "github:edolstra/nixpkgs/e9d5882bb861dc48f8d46960e7c820efdbe8f9c1"
}
}
because the flake ID needs to be known beforehand to construct the
"inputs" attrset.
Fixes #2913.
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Issue #2828.
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It also lists the contents of "checks" and "packages".
For example:
$ nix flake info --json | jq
{
"branch": "HEAD",
"description": "The purely functional package manager",
"epoch": 2019,
"id": "nix",
"lastModified": 1559161142,
"path": "/nix/store/2w2qla8735dbxah8gai8r1nsbf5x4f5d-source",
"provides": {
"checks": {
"binaryTarball": {},
"nix-copy-closure": {},
"perlBindings": {},
"remoteBuilds": {},
"setuid": {}
},
"defaultPackage": {},
"devShell": {},
"hydraJobs": {},
"packages": {
"nix": {},
"nix-perl-bindings": {}
}
},
"revCount": 6955,
"revision": "8cb24e04e8b6cc60e2504733afe78e0eadafcd98",
"uri": "/home/eelco/Dev/nix"
}
Fixes #2820.
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This evaluates all the 'provides' of a flake and builds the 'check'
attributes.
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This is primarily useful for version string generation, where we need
a monotonically increasing number. The revcount is the preferred thing
to use, but isn't available for GitHub flakes (since it requires
fetching the entire history). The last commit timestamp OTOH can be
extracted from GitHub tarballs.
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It doesn't produce valid JSON at the moment (but a concatenation of
JSON objects). Anyway we probably should merge this command info 'nix
flake info'.
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This deduplicates some shared fields. Factoring out the commonality is
useful in places like makeFlakeValue().
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Closes #2883.
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Also, rename --dont-save-lock-file to --no-save-lock-file and change
noRegistries to useRegistries.
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It now handles commonality like calling getFlake() and resolving
relative local flake refs.
Fixes #2822.
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If DontUpdate but the lockfile isn't correct
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lockfile updating
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