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This helps nix-prefetch-url when using a local store.
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This reduces memory consumption of
nix-instantiate \
-E 'with import <nixpkgs> {}; runCommand "foo" { src = ./blender; } "echo foo"' \
--option nar-buffer-size 10000
(where ./blender is a 1.1 GiB tree) from 1716 to 36 MiB, while still
ensuring that we don't do any write I/O for small source paths (up to
'nar-buffer-size' bytes). The downside is that large paths are now
always written to a temporary location in the store, even if they
produce an already valid store path. Thus, adding large paths might be
slower and run out of disk space. ¯\_(ツ)_/¯ Of course, you can always
restore the old behaviour by setting 'nar-buffer-size' to a very high
value.
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Example:
$ nix-build -E 'with import <nixpkgs> {}; runCommand "foo" { x = runCommand "bar" {} "exit 1"; } "echo foo; exit 1"'
warning: unknown setting 'auto-allocate-uids'
these 2 derivations will be built:
/nix/store/v4fbdbhcdi949929a67g8farwf72zgam-bar.drv
/nix/store/k4fsvrjl7cp2xpz7927iv7g0dqj1zyhs-foo.drv
warning: unknown setting 'auto-allocate-uids'
building '/nix/store/v4fbdbhcdi949929a67g8farwf72zgam-bar.drv'...
error: --- Error ----------------------------------------------------------------------------------------------------------------------------------------------------------------- nix-daemon
builder for '/nix/store/v4fbdbhcdi949929a67g8farwf72zgam-bar.drv' failed with exit code 1
error: --- Error ------------------------------------------------------------------------------------------------------------------------------------------------------------------ nix-build
got unknown message type 1 from Nix daemon
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Fixes #3471.
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Fix a socket length failure on the OSX builders
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hashed-mirrors: Use parsed derivation output rather than reconstructing it
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Fall back to copyPath if link fails with EPERM
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https://hydra.nixos.org/build/123017579
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BeeGFS doesn't allow hard-links and returns EPERM, so we fall back
to copyPath. See https://github.com/NixOS/nix/issues/3748
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Generalize `queryDerivationOutputNames` and `queryDerivationOutputs` by
adding a `queryDerivationOutputMap` that returns the map
`outputName=>outputPath`
(not that this is not equivalent to merging the results of
`queryDerivationOutputs` and `queryDerivationOutputNames` as sets don't
preserve the order, so we would end up with an incorrect mapping).
squash! Add a way to get all the outputs of a derivation with their label
Rename StorePathMap to OutputPathMap
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Now the derivation outputs are parsed up front, we can avoid a reparse
by doing it. Also, this just feels a bit better as the `output*` env
vars are more of a `libnixexpr` interface than `libnixstore` interface:
ultimately, it's the derivation outputs that decide whether the
derivation is fixed-output.
Yes, hashed mirrors might go away with #3689, but this bit of code would
be moved rather than deleted, so it's worth doing a cleanup anyways I
think.
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validPathInfo-ca-proper-datatype
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no-stringly-typed-derivation-output
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Not a regular git revert as there have been many merges and things.
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See <https://github.com/NixOS/nix/pull/3710#issuecomment-645480333>
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Cleanup class StorePath warning
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obsidiansystems/make-http-successful-states-coherent
Make successful states coherent
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also a similar case with struct Goal
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Reserve the `__contentAddressed` derivation parameter
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replaced uncaught_exception with uncaught_exceptions
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The successful states used in these two places in the code were slightly
different. Should they be the same list?
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Not implementing anything here, just throwing an error if a derivation
sets `__contentAddressed = true` without
`--experimental-features content-addressed-paths`
(and also with it as there's nothing implemented yet)
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obsidiansystems/sligthly-improve-store-path-documentation
Clarify the description of StorePath inputs
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no-stringly-typed-derivation-output
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On nix-env -qa -f '<nixpkgs>', this reduces maximum RSS by 20970 KiB
and runtime by 0.8%. This is mostly because we're not parsing the hash
part as a hash anymore (just validating that it consists of base-32
characters).
Also, replace storePathToHash() by StorePath::hashPart().
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