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For instance, 'nix why-depends --use-derivation nixpkgs#hello
nixpkgs#glibc' shows why hello's .drv depends on glibc's .drv.
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That is, the commands 'nix path-info nixpkgs#hello' and 'nix path-info
/nix/store/00ls0qi49qkqpqblmvz5s1ajl3gc63lr-hello-2.10.drv' now do the
same thing (i.e. build the derivation and operate on the output store
path, rather than the .drv path).
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This allows you to refer to an input from another flake. For example,
$ nix run --inputs-from /path/to/hydra nixpkgs#hello
runs 'hello' from the 'nixpkgs' inputs of the 'hydra' flake.
Fixes #3769.
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E.g.
$ nix run nixpkgs#hello
error: --- Error ---------- nix
flake 'flake:nixpkgs' does not provide attribute 'apps.x86_64-linux.hello' or 'hello'
instead of
$ nix run nixpkgs#hello
error: --- Error ---------- nix
flake 'flake:nixpkgs' does not provide attribute 'hello'
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This fixes an issue where lockfile generation was not idempotent:
after updating a lockfile, a "follows" node would end up pointing to a
new copy of the node, rather than to the original node.
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The initial contents of the flake is specified by the
'templates.<name>' or 'defaultTemplate' output of another flake. E.g.
outputs = { self }: {
templates = {
nixos-container = {
path = ./nixos-container;
description = "An example of a NixOS container";
};
};
};
allows
$ nix flake init -t templates#nixos-container
Also add a command 'nix flake new', which is identical to 'nix flake
init' except that it initializes a specified directory rather than the
current directory.
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Fixes
$ nix build nixpkgs#zoom-us
error: Package ‘zoom-us-5.0.399860.0429’ in /nix/store/m79v7h75b69fkk8d2qcwm555l3wq6fmv-source/pkgs/applications/networking/instant-messengers/zoom-us/default.nix:126 has an unfree license (‘unfree’), refusing to evaluate.
$ nix build nixpkgs#zoom-us --impure
error: cached failure of attribute 'legacyPackages.x86_64-linux.zoom-us.drvPath'
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The attributes previously stored in TreeInfo (narHash, revCount,
lastModified) are now stored in Input. This makes it less arbitrary
what attributes are stored where.
As a result, the lock file format has changed. An entry like
"info": {
"lastModified": 1585405475,
"narHash": "sha256-bESW0n4KgPmZ0luxvwJ+UyATrC6iIltVCsGdLiphVeE="
},
"locked": {
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "b88ff468e9850410070d4e0ccd68c7011f15b2be",
"type": "github"
},
is now stored as
"locked": {
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "b88ff468e9850410070d4e0ccd68c7011f15b2be",
"type": "github",
"lastModified": 1585405475,
"narHash": "sha256-bESW0n4KgPmZ0luxvwJ+UyATrC6iIltVCsGdLiphVeE="
},
The 'Input' class is now a dumb set of attributes. All the fetcher
implementations subclass InputScheme, not Input. This simplifies the
API.
Also, fix substitution of flake inputs. This was broken since lazy
flake fetching started using fetchTree internally.
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Generic shell completion support for the 'nix' command
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This completes flakerefs using the registry (e.g. 'nix<TAB>' => 'nix
nixpkgs') and flake output attributes by evaluating the flake
(e.g. 'dwarffs#nix<TAB>' => 'dwarffs#nixosModules').
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This reverts commit 883948d7a0add742ccae58e9845d769a8064371c.
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InstallableValue has children InstallableFlake and InstallableAttrPath, but InstallableFlake was overriding toDerivations, and usage was changed so that InstallableFlake didn't need cmd. So these changes were made:
InstallableValue::toDerivations() -> InstalllableAttrPath::toDerivations()
InstallableValue::cmd -> InstallableAttrPath::cmd
InstallableValue uses state instead of cmd
toBuildables() and toDerivations() were made abstract
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Since we've changed a lot of things in the 'nix' command (e.g. rename
'nix run') there is not much point in keeping this around.
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Fixes
$ nix copy
warning: Git tree '/home/eelco/Dev/nix-flake' is dirty
nix: src/nix/installables.cc:348: std::tuple<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, nix::FlakeRef, nix::InstallableValue::DerivationInfo> nix::InstallableFlake::toDerivation(): Assertion `state->store->isValidPath(drvPath)' failed.
Aborted (core dumped)
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In particular, doing 'nix build /path/to/dir' now works if
/path/to/dir is not a Git tree (it only has to contain a flake.nix
file).
Also, 'nix flake init' no longer requires a Git tree (but it will do a
'git add flake.nix' if it's a Git tree)
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It uses the evaluation cache now rather than the ad hoc JSON cache.
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Previously the memory would occasionally be collected during eval since
the GC doesn't consider the member variable as alive / doesn't scan the
region of memory where the pointer lives.
By using the traceable_allocator<T> allocator provided by Boehm GC we
can ensure the memory isn't collected. It should be properly freed when
SourceExprCommand goes out of scope.
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This also adds a '--profile' option to 'nix build' (replacing 'nix-env
--set').
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E.g.
$ nix edit .#nixosConfigurations.bla
now works.
(cherry picked from commit d2032edb2f86e955a8a7724a27c0c3225f386500)
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(cherry picked from commit 0b013a54dc570395bed887369f8dd622b8ce337b)
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This is not compatible with lazy flake input fetching.
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