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7080321618
Extend `FSAccessor::readFile` to allow not checking that the path is a valid one, and rewrite `readInvalidDerivation` using this extended `readFile`. Several places in the code use `readInvalidDerivation`, either because they need to read a derivation that has been written in the store but not registered yet, or more generally to prevent a deadlock because `readDerivation` tries to lock the state, so can't be called from a place where the lock is already held. However, `readInvalidDerivation` implicitely assumes that the store is a `LocalFSStore`, which isn't always the case. The concrete motivation for this is that it's required for `nix copy --from someBinaryCache` to work, which is tremendously useful for the tests.
40 lines
1 KiB
C++
40 lines
1 KiB
C++
#pragma once
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#include "types.hh"
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namespace nix {
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/* An abstract class for accessing a filesystem-like structure, such
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as a (possibly remote) Nix store or the contents of a NAR file. */
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class FSAccessor
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{
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public:
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enum Type { tMissing, tRegular, tSymlink, tDirectory };
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struct Stat
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{
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Type type = tMissing;
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uint64_t fileSize = 0; // regular files only
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bool isExecutable = false; // regular files only
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uint64_t narOffset = 0; // regular files only
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};
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virtual ~FSAccessor() { }
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virtual Stat stat(const Path & path) = 0;
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virtual StringSet readDirectory(const Path & path) = 0;
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/**
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* Read a file inside the store.
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*
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* If `requireValidPath` is set to `true` (the default), the path must be
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* inside a valid store path, otherwise it just needs to be physically
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* present (but not necessarily properly registered)
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*/
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virtual std::string readFile(const Path & path, bool requireValidPath = true) = 0;
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virtual std::string readLink(const Path & path) = 0;
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};
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}
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