forked from lix-project/lix
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.
41 lines
921 B
C++
41 lines
921 B
C++
#pragma once
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#include "fs-accessor.hh"
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#include "ref.hh"
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#include "store-api.hh"
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namespace nix {
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class RemoteFSAccessor : public FSAccessor
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{
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ref<Store> store;
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std::map<std::string, ref<FSAccessor>> nars;
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Path cacheDir;
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std::pair<ref<FSAccessor>, Path> fetch(const Path & path_, bool requireValidPath = true);
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friend class BinaryCacheStore;
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Path makeCacheFile(std::string_view hashPart, const std::string & ext);
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void addToCache(std::string_view hashPart, const std::string & nar,
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ref<FSAccessor> narAccessor);
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public:
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RemoteFSAccessor(ref<Store> store,
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const /* FIXME: use std::optional */ Path & cacheDir = "");
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Stat stat(const Path & path) override;
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StringSet readDirectory(const Path & path) override;
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std::string readFile(const Path & path, bool requireValidPath = true) override;
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std::string readLink(const Path & path) override;
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};
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}
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