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This is like 'nix run', except that the command to execute is defined
in a flake output, e.g.
defaultApp = {
type = "app";
program = "${packages.blender_2_80}/bin/blender";
};
Thus you can do
$ nix app blender-bin
to start Blender from the 'blender-bin' flake.
In the future, we can extend this with sandboxing. (For example we
would want to be able to specify that Blender should not have network
access by default and should only have access to certain paths in the
user's home directory.)
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So now
$ nix build blender-bin
works and builds the default package from that flake. You don't need
to add a colon at the end anymore.
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Issue #2828.
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Nixpkgs doesn't provide a clean "packages" set yet, so until that's
the case, look for packages in "legacyPackages" as well.
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This deduplicates some shared fields. Factoring out the commonality is
useful in places like makeFlakeValue().
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This ensures that flakes don't get garbage-collected, which is
important to get nix-channel-like behaviour.
For example, running
$ nix build hydra:
will create a GC root
~/.cache/nix/flake-closures/hydra -> /nix/store/xarfiqcwa4w8r4qpz1a769xxs8c3phgn-flake-closure
where the contents/references of the linked file in the store are the
flake source trees used by the 'hydra' flake:
/nix/store/n6d5f5lkpfjbmkyby0nlg8y1wbkmbc7i-source
/nix/store/vbkg4zy1qd29fnhflsv9k2j9jnbqd5m2-source
/nix/store/z46xni7d47s5wk694359mq9ay353ar94-source
Note that this in itself is not enough to allow offline use; the
fetcher for the flakeref (e.g. fetchGit or downloadCached) must not
fail if it cannot fetch the latest version of the file, so long as it
knows a cached version.
Issue #2868.
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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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Thus
$ nix dev-shell
will now build the 'provides.devShell' attribute from the flake in the
current directory. If it doesn't exist, it falls back to
'provides.defaultPackage'.
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This makes e.g. "nix build" do something more or less reasonable
(namely, build the default package of the flake in the current
directory).
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This ensures that the lock file is updated *before* evaluating it, and
that it gets updated for any nix command, not just 'nix build'.
Also, while computing the lock file, allow arbitrary registry lookups,
not just at top-level.
Also, improve some error messages slightly.
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Also allow "." as an installable to refer to the flake in the current
directory. E.g.
$ nix build .
will build 'provides.defaultPackage' in the flake in the current
directory.
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The general syntax for an installable is now
<flakeref>:<attrpath>. The attrpath is relative to the flake's
'provides.packages' or 'provides' if the former doesn't yield a
result. E.g.
$ nix build nixpkgs:hello
is equivalent to
$ nix build nixpkgs:packages.hello
Also, '<flakeref>:' can be omitted, in which case it defaults to
'nixpkgs', e.g.
$ nix build hello
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This allows using an arbitrary "provides" attribute from the specified
flake. For example:
nix build --flake nixpkgs packages.hello
(Maybe provides.packages should be used for consistency...)
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... plus a temporary hack to allow impure flakes at top-level for the
default installation source.
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We want to encourage a brave new world of hermetic evaluation for
source-level reproducibility, so flakes should not poke around in the
filesystem outside of their explicit dependencies.
Note that the default installation source remains impure in that it
can refer to mutable flakes, so "nix build nixpkgs.hello" still works
(and fetches the latest nixpkgs, unless it has been pinned by the
user).
A problem with pure evaluation is that builtins.currentSystem is
unavailable. For the moment, I've hard-coded "x86_64-linux" in the
nixpkgs flake. Eventually, "system" should be a flake function
argument.
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This makes 'nix copy' and 'nix path-info' work on .drv store
paths. Removing special treatment of .drv files seems the most
future-proof approach given the possible removal of .drv files in the
future.
Note that 'nix build' will still build (rather than substitute) .drv
paths due to the unfortunate overloading in Store::buildPaths().
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parseExprFromFile() should be avoided since it doesn't cache anything.
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Also, random cleanup to argument handling.
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This debug command prints a store derivation in JSON format. For
example:
$ nix show-derivation nixpkgs.hello
{
"/nix/store/ayjwpwwiyy04nh9z71rsdgd3q7bra7ch-hello-2.10.drv": {
"outputs": {
"out": {
"path": "/nix/store/w5w4v29ql0qwqhczkdxs94ix2lh7ibgs-hello-2.10"
}
},
"inputSrcs": [
"/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
],
"inputDrvs": {
"/nix/store/13839aqdf6x4k3b785rw5f2l7857l6y3-bash-4.4-p12.drv": [
"out"
],
"/nix/store/vgdx7fdc7d4iirmnwj2py1nrvr5qwzj7-hello-2.10.tar.gz.drv": [
"out"
],
"/nix/store/x3kkd0vsqfflbvwf1055l9mr39bg0ms0-stdenv.drv": [
"out"
]
},
"platform": "x86_64-linux",
"builder": "/nix/store/qp5fw57d38bd1n07ss4zxh88zg67c3vg-bash-4.4-p12/bin/bash",
"args": [
"-e",
"/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
],
"env": {
"buildInputs": "",
"builder": "/nix/store/qp5fw57d38bd1n07ss4zxh88zg67c3vg-bash-4.4-p12/bin/bash",
"configureFlags": "",
"doCheck": "1",
"name": "hello-2.10",
"nativeBuildInputs": "",
"out": "/nix/store/w5w4v29ql0qwqhczkdxs94ix2lh7ibgs-hello-2.10",
"propagatedBuildInputs": "",
"propagatedNativeBuildInputs": "",
"src": "/nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz",
"stdenv": "/nix/store/6zngq1rdh0ans9qyckqimqibgnlvlfrm-stdenv",
"system": "x86_64-linux"
}
}
}
This removes the need for pp-aterm.
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Also some refactoring.
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E.g.
$ nix build --store local?root=/tmp/nix nixpkgs.firefox-unwrapped
[0/1 built, 1/97/98 fetched, 65.8/92.8 MiB DL, 203.2/309.2 MiB copied] downloading 'https://cache.nixos.org/nar/1czm9fk0svacy4h6a3fzkpafi4f7a9gml36kk8cq1igaghbspg3k.nar.xz'
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Relevant RFC: NixOS/rfcs#4
$ ag -l | xargs sed -i -e "/\"/s/’/'/g;/\"/s/‘/'/g"
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$NIX_PATH may contain elements that don't evaluate to an attrset (like
"nixos-config"), so ignore those.
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