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maintainers/scripts/update.nix: Fix deduplication for unstableGitUpdater
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Some updaters like `unstableGitUpdater` rely solely `UPDATE_NIX_ATTR_PATH`
environment variable to find out package attribute so they all have
the same `passthru.updateScript`. This means we cannot rely
on that attribute to filter out aliased packages because it would
consider all packages using `unstableGitUpdater` the same.
We need to use different criterion to distinguish them. `meta.position`
is a reasonable candidate but we cannot always utilize it since
it might not be available or it might be shared among multiple packages
(e.g. when using custom mkDerivation wrapper).
Combination of the two attributes should distinguish most cases.
Fixes: https://github.com/NixOS/nixpkgs/issues/112583
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I noticed this minor grammar mistake when running update.nix, and then
while grepping to find the source I noticed we had it a few times in
Nixpkgs. Just as easy to fix treewide as it was to fix the one
occurrence I noticed.
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Since GNOME version is now 40, it no longer makes sense to use the old attribute name.
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Arbitrary predicate is useful for updating decentralised package sets like GNOME.
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Lists items are not directly accessible like attributes in attrsets are.
This makes it hard to represent their address in `UPDATE_NIX_ATTR_PATH`
environment variable passed to update scripts.
Given that I only introduced list support for `gnome3` attribute set
and we stopped using them there, let’s remove the list support again.
NixOS modules are better place for package collections anyway.
This was meant to go in with https://github.com/NixOS/nixpkgs/pull/98304
but got accidentally omitted somehow.
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- Make some arguments more fitting (the path is actually full, not just relative to prefix…).
- Increase the purity of packages* functions (they now take pkgs from argument, not from scope).
- Add some documentation comments.
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Instead of having the updateScript support returning JSON object,
it should be sufficient to specify attrPath in passthru.updateScript.
It is much easier to use.
The former is now considered experimental.
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Update scripts can now declare features using
passthru.updateScript = {
command = [ ../../update.sh pname ];
supportedFeatures = [ "commit" ];
};
A `commit` feature means that when the update script finishes successfully,
it will print a JSON list like the following:
[
{
"attrPath": "volume_key",
"oldVersion": "0.3.11",
"newVersion": "0.3.12",
"files": [
"/path/to/nixpkgs/pkgs/development/libraries/volume-key/default.nix"
]
}
]
and data from that will be used when update.nix is run with --argstr commit true
to create commits.
We will create a new git worktree for each thread in the pool and run the update
script there. Then we will commit the change and cherry pick it in the main repo,
releasing the worktree for a next change.
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Previously, we relied on NIX_PATH for passing overlays but with flakes, we should pass them explicitly.
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The `packagesWith` function expected an attrSet but `packagesWithUpdateScript`
could be passing it a derivation or a list when the attribute path
supplied by user through the `--argstr path` argument pointed to one.
It only worked because derivations are also attrSets and contain their
outputs as attributes, and did not work for lists at all.
Additionally, the improper handling would cause the `src` attribute
to be built in some rare cases (`mkYarnPackage` seems to trigger this).
Rewriting the `packagesWith` function to be inductive with a derivation
as a base case and attrSets and lists as inductive steps is much cleaner
and also fixes the unnecessary build.
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It does not make sense to look for derivations within derivations,
not even when `recurseForDerivations` is true. Nix does not do that either:
https://github.com/NixOS/nix/blob/ebc024df2287085d48ed6194aa756fd70c07f76c/src/libexpr/get-drvs.cc#L346-L355
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This will make it easier to change it if we want to decouple from pkgs.
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That is because this commit should be merged to both master and
release-19.09.
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Make calling update.py a little nicer
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Previously we did not handle non-existant paths making the program crash.
Let’s show a proper error.
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It makes little sense for update.nix to try to update overlays; for most people,
they will point to a read-only repository most of the cases.
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For update script parallelization, we have started calling builtins.toJSON
on updateScripts, which triggers evaluation of paths and therefore their copying
to Nix store. This breaks update scripts that assume that they exist in nixpkgs
like dwarf-fortress.
https://github.com/NixOS/nixpkgs/issues/61935
Let’s stringify the paths before JSONification to prevent the evaluation.
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To make updating large attribute sets faster, the update scripts
are now run in parallel.
Please note the following changes in semantics:
- The string passed to updateScript needs to be a path to an executable file.
- The updateScript can also be a list: the tail elements will then be passed
to the head as command line arguments.
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Lot of my GNOME packages have several legacy aliases,
which causes them to be updated multiple times.
This patch uses lib.unique to remove the duplicates.
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