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This changes was taken from dynamic derivation (#4628). It` somewhat
undoes the refactors I first did for floating CA derivations, as the
benefit of hindsight + requirements of dynamic derivations made me
reconsider some things.
They aren't to consequential, but I figured they might be good to land
first, before the more profound changes @thufschmitt has in the works.
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be more memory friendly
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git fetcher: fix detection of dirty git workspaces
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Add Store::buildPathsWithResults()
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no need for function<> with c++17 deduction. this saves allocations and virtual
calls, but has the same semantics otherwise. not going through function has the
side effect of giving compilers more insight into the cleanup code, so we need a
few local warning disables.
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reduces peak hep memory use on eval of our test system from 264.4MB to 242.3MB,
possibly also a slight performance boost.
theoretically memory use could be cut down by another eight bytes per Pos on
average by turning it into a tuple containing an index into a global base
position table with row and column offsets, but that doesn't seem worth the
effort at this point.
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these functions are called a whole lot, and they're all comparatively small.
always inlining them gives ~0.7% performance boost on eval.
before:
Benchmark 1: nix flakes search --no-eval-cache --offline ../nixpkgs hello
Time (mean ± σ): 6.935 s ± 0.052 s [User: 5.852 s, System: 0.853 s]
Range (min … max): 6.808 s … 7.026 s 20 runs
Benchmark 2: nix flakes eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 329.8 ms ± 2.7 ms [User: 299.0 ms, System: 30.8 ms]
Range (min … max): 326.6 ms … 336.5 ms 20 runs
Benchmark 3: nix flakes eval --raw --impure --file expr.nix
Time (mean ± σ): 2.655 s ± 0.038 s [User: 2.364 s, System: 0.220 s]
Range (min … max): 2.574 s … 2.737 s 20 runs
after:
Benchmark 1: nix flakes search --no-eval-cache --offline ../nixpkgs hello
Time (mean ± σ): 6.912 s ± 0.036 s [User: 5.823 s, System: 0.856 s]
Range (min … max): 6.849 s … 6.980 s 20 runs
Benchmark 2: nix flakes eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 325.1 ms ± 2.5 ms [User: 293.2 ms, System: 31.8 ms]
Range (min … max): 322.2 ms … 332.8 ms 20 runs
Benchmark 3: nix flakes eval --raw --impure --file expr.nix
Time (mean ± σ): 2.636 s ± 0.024 s [User: 2.352 s, System: 0.226 s]
Range (min … max): 2.574 s … 2.681 s 20 runs
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vast majority of envs is this size.
before:
Benchmark 1: nix flakes search --no-eval-cache --offline ../nixpkgs hello
Time (mean ± σ): 6.946 s ± 0.041 s [User: 5.875 s, System: 0.835 s]
Range (min … max): 6.834 s … 7.005 s 20 runs
Benchmark 2: nix flakes eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 330.3 ms ± 2.5 ms [User: 299.2 ms, System: 30.9 ms]
Range (min … max): 327.5 ms … 337.7 ms 20 runs
Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.671 s ± 0.035 s [User: 2.370 s, System: 0.232 s]
Range (min … max): 2.597 s … 2.749 s 20 runs
after:
Benchmark 1: nix flakes search --no-eval-cache --offline ../nixpkgs hello
Time (mean ± σ): 6.935 s ± 0.052 s [User: 5.852 s, System: 0.853 s]
Range (min … max): 6.808 s … 7.026 s 20 runs
Benchmark 2: nix flakes eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 329.8 ms ± 2.7 ms [User: 299.0 ms, System: 30.8 ms]
Range (min … max): 326.6 ms … 336.5 ms 20 runs
Benchmark 3: nix flakes eval --raw --impure --file expr.nix
Time (mean ± σ): 2.655 s ± 0.038 s [User: 2.364 s, System: 0.220 s]
Range (min … max): 2.574 s … 2.737 s 20 runs
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turns out it's only necessary for MANUAL_VDB, which nix doesn't use. omitting
them gives a slight performance improvement on eval.
before:
Benchmark 1: nix flakes search --no-eval-cache --offline ../nixpkgs hello
Time (mean ± σ): 6.988 s ± 0.061 s [User: 5.935 s, System: 0.845 s]
Range (min … max): 6.865 s … 7.075 s 20 runs
Benchmark 2: nix flakes eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 332.6 ms ± 3.9 ms [User: 299.6 ms, System: 32.9 ms]
Range (min … max): 328.1 ms … 339.1 ms 20 runs
Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.681 s ± 0.049 s [User: 2.382 s, System: 0.228 s]
Range (min … max): 2.607 s … 2.776 s 20 runs
after:
Benchmark 1: nix flakes search --no-eval-cache --offline ../nixpkgs hello
Time (mean ± σ): 6.946 s ± 0.041 s [User: 5.875 s, System: 0.835 s]
Range (min … max): 6.834 s … 7.005 s 20 runs
Benchmark 2: nix flakes eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
Time (mean ± σ): 330.3 ms ± 2.5 ms [User: 299.2 ms, System: 30.9 ms]
Range (min … max): 327.5 ms … 337.7 ms 20 runs
Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
Time (mean ± σ): 2.671 s ± 0.035 s [User: 2.370 s, System: 0.232 s]
Range (min … max): 2.597 s … 2.749 s 20 runs
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This function is like buildPaths(), except that it returns a vector of
BuildResults containing the exact statuses and output paths of each
derivation / substitution. This is convenient for functions like
Installable::build(), because they then don't need to do another
series of calls to get the outputs of CA derivations. It's also a
precondition to impure derivations, where we *can't* query the output
of those derivations since they're not stored in the Nix database.
Note that PathSubstitutionGoal can now also return a BuildStatus.
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```console
$ nix eval --expr '({ foo ? 1 }: foo) { fob = 2; }'
error: anonymous function at (string):1:2 called with unexpected argument 'fob'
at «string»:1:1:
1| ({ foo ? 1 }: foo) { fob = 2; }
| ^
Did you mean foo?
```
Not that because Nix will first check for _missing_ arguments before
checking for extra arguments, `({ foo }: foo) { fob = 1; }` will
complain about the missing `foo` argument (rather than extra `fob`) and
so won’t display a suggestion.
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Make the evaluator show some suggestions when trying to access an
invalid field from an attrset.
```console
$ nix eval --expr '{ foo = 1; }.foa'
error: attribute 'foa' missing
at «string»:1:1:
1| { foo = 1; }.foa
| ^
Did you mean foo?
```
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https://github.com/GuillaumeDesforges/nix
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No real need for keeping a separate header for such a simple class.
This requires changing a bit `OrSuggestions<T>::operator*` to not throw
an `Error` to prevent a cyclic dependency. But since this error is only
thrown on programmer error, we can replace the whole method by a direct
call to `std::get` which will raise its own assertion if needs be.
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Fix `mkString` for empty `string_view`
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Refactor the `size == 0` logic into a new helper function that
replaces dupStringWithLen.
The name had to change, because unlike a `dup`-function, it does
not always allocate a new string.
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That way there’s no need to explicitely convert it to a string when
printing it
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Prevents a recursive inclusion
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Make `nix build .#nix-armv8l-linux` work for example
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Each `Error` class now includes a set of suggestions, and these are printed by
the top-level handler.
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ssh-ng: also store build logs to make them accessible by `nix log`
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Point to new github oauth docs url
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Previous URL was 404'ing.
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Factor out a `GcStore` interface
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Starts progress on #5729.
The idea is that we should not have these default methods throwing
"unimplemented". This is a small step in that direction.
I kept `addTempRoot` because it is a no-op, rather than failure. Also,
as a practical matter, it is called all over the place, while doing
other tasks, so the downcasting would be annoying.
Maybe in the future I could move the "real" `addTempRoot` to `GcStore`,
and the existing usecases use a `tryAddTempRoot` wrapper to downcast or
do nothing, but I wasn't sure whether that was a good idea so with a
bias to less churn I didn't do it yet.
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printValue(): Don't show repeated values
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We now memoize on Bindings / list element vectors rather than Values,
so that e.g. two Values that point to the same Bindings will be
printed only once.
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Fixes #6157.
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https://hydra.nixos.org/build/168594664
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Add EvalState::coerceToStorePath() helper
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