More toRealPath cleanups #14249
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More toRealPath cleanups #14249
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…FSAccessor This is a simple wrapper around getFSAccessor that throws an InvalidPath error. This simplifies usage in callsites that only care about getting a non-null accessor.
We only care about the accessor for a single store object anyway, but the validity gets ignored. Also `pathExists(store.printStorePath(path))` is definitely incorrect since it confuses the logical location vs physical location in case of a chroot store.
…in fetch
This forces the code to go through proper abstractions instead of the raw filesystem
API.
This issue is evident from this reproducer:
nix eval --expr 'builtins.fetchurl { url = "https://example.com"; sha256 = ""; }' --json --eval-store "dummy://?read-only=false"
error:
… while calling the 'fetchurl' builtin
at «string»:1:1:
1| builtins.fetchurl { url = "https://example.com"; sha256 = ""; }
| ^
error: opening file '/nix/store/r4f87yrl98f2m6v9z8ai2rbg4qwlcakq-example.com': No such file or directory
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Motivation
Gradually making more of the code use
SourceAccessorand better IO abstractions.Context
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