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Change types to prepare the way for CA derivations

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We've added the variant to `DerivationOutput` to support them, but made
`DerivationOutput::path` partial to avoid actually implementing them.

With this chage, we can all collaborate on "just" removing
`DerivationOutput::path` calls to implement CA derivations.
This commit is contained in:
John Ericson 2020-07-12 16:12:21 +00:00
parent fedfc913ad
commit 230c9b4329
3 changed files with 71 additions and 24 deletions
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71
src/libstore/derivations.cc
View file

@ -8,15 +8,20 @@
namespace nix {
StorePath DerivationOutput::path(const Store & store, std::string_view drvName) const
std::optional<StorePath> DerivationOutput::pathOpt(const Store & store, std::string_view drvName) const
{
return std::visit(overloaded {
[](DerivationOutputInputAddressed doi) {
return doi.path;
[](DerivationOutputInputAddressed doi) -> std::optional<StorePath> {
return { doi.path };
},
[&](DerivationOutputFixed dof) -> std::optional<StorePath> {
return {
store.makeFixedOutputPath(dof.hash.method, dof.hash.hash, drvName)
};
},
[](DerivationOutputFloating dof) -> std::optional<StorePath> {
return std::nullopt;
},
[&](DerivationOutputFixed dof) {
return store.makeFixedOutputPath(dof.hash.method, dof.hash.hash, drvName);
}
}, output);
}
@ -128,14 +133,21 @@ static DerivationOutput parseDerivationOutput(const Store & store, istringstream
}
const HashType hashType = parseHashType(hashAlgo);
return DerivationOutput {
.output = DerivationOutputFixed {
.hash = FixedOutputHash {
.method = std::move(method),
.hash = Hash(hash, hashType),
},
}
};
return hash != ""
? DerivationOutput {
.output = DerivationOutputFixed {
.hash = FixedOutputHash {
.method = std::move(method),
.hash = Hash(hash, hashType),
},
}
}
: DerivationOutput {
.output = DerivationOutputFloating {
.method = std::move(method),
.hashType = std::move(hashType),
},
};
} else
return DerivationOutput {
.output = DerivationOutputInputAddressed {
@ -292,6 +304,10 @@ string Derivation::unparse(const Store & store, bool maskOutputs,
s += ','; printUnquotedString(s, dof.hash.printMethodAlgo());
s += ','; printUnquotedString(s, dof.hash.hash.to_string(Base16, false));
},
[&](DerivationOutputFloating dof) {
s += ','; printUnquotedString(s, makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType));
s += ','; printUnquotedString(s, "");
},
}, i.second.output);
s += ')';
}
@ -439,14 +455,21 @@ static DerivationOutput readDerivationOutput(Source & in, const Store & store)
hashAlgo = string(hashAlgo, 2);
}
auto hashType = parseHashType(hashAlgo);
return DerivationOutput {
.output = DerivationOutputFixed {
.hash = FixedOutputHash {
.method = std::move(method),
.hash = Hash(hash, hashType),
},
}
};
return hash != ""
? DerivationOutput {
.output = DerivationOutputFixed {
.hash = FixedOutputHash {
.method = std::move(method),
.hash = Hash(hash, hashType),
},
}
}
: DerivationOutput {
.output = DerivationOutputFloating {
.method = std::move(method),
.hashType = std::move(hashType),
},
};
} else
return DerivationOutput {
.output = DerivationOutputInputAddressed {
@ -514,6 +537,10 @@ void writeDerivation(Sink & out, const Store & store, const BasicDerivation & dr
out << dof.hash.printMethodAlgo()
<< dof.hash.hash.to_string(Base16, false);
},
[&](DerivationOutputFloating dof) {
out << (makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType))
<< "";
},
}, i.second.output);
}
writeStorePaths(store, out, drv.inputSrcs);

21
src/libstore/derivations.hh
View file

@ -15,6 +15,8 @@ namespace nix {
struct DerivationOutputInputAddressed
{
/* Will need to become `std::optional<StorePath>` once input-addressed
derivations are allowed to depend on cont-addressed derivations */
StorePath path;
};
@ -23,13 +25,28 @@ struct DerivationOutputFixed
FixedOutputHash hash; /* hash used for expected hash computation */
};
struct DerivationOutputFloating
{
/* information used for expected hash computation */
FileIngestionMethod method;
HashType hashType;
};
struct DerivationOutput
{
std::variant<
DerivationOutputInputAddressed,
DerivationOutputFixed
DerivationOutputFixed,
DerivationOutputFloating
> output;
StorePath path(const Store & store, std::string_view drvName) const;
std::optional<HashType> hashAlgoOpt(const Store & store) const;
std::optional<StorePath> pathOpt(const Store & store, std::string_view drvName) const;
/* DEPRECATED: Remove after CA drvs are fully implemented */
StorePath path(const Store & store, std::string_view drvName) const {
auto p = pathOpt(store, drvName);
if (!p) throw Error("floating content-addressed derivations are not yet implemented");
return *p;
}
};
typedef std::map<string, DerivationOutput> DerivationOutputs;

3
src/nix/show-derivation.cc
View file

@ -78,6 +78,9 @@ struct CmdShowDerivation : InstallablesCommand
outputObj.attr("hashAlgo", dof.hash.printMethodAlgo());
outputObj.attr("hash", dof.hash.hash.to_string(Base16, false));
},
[&](DerivationOutputFloating dof) {
outputObj.attr("hashAlgo", makeFileIngestionPrefix(dof.method) + printHashType(dof.hashType));
},
}, output.second.output);
}
}