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Reduce variants for derivation hash modulo

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This changes was taken from dynamic derivation (#4628). It` somewhat
undoes the refactors I first did for floating CA derivations, as the
benefit of hindsight + requirements of dynamic derivations made me
reconsider some things.

They aren't to consequential, but I figured they might be good to land
first, before the more profound changes @thufschmitt has in the works.
This commit is contained in:
John Ericson 2021-10-01 18:05:53 +00:00
parent aee56e0f89
commit 0948b8e94d
5 changed files with 131 additions and 72 deletions
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40
src/libstore/derivations.hh
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@ -175,13 +175,43 @@ std::string outputPathName(std::string_view drvName, std::string_view outputName
// whose output hashes are always known since they are fixed up-front.
typedef std::map<std::string, Hash> CaOutputHashes;
struct DeferredHash { Hash hash; };
struct DrvHash {
Hash hash;
enum struct Kind {
// Statically determined derivations.
// This hash will be directly used to compute the output paths
Regular,
// Floating-output derivations (and their dependencies).
Deferred,
};
Kind kind;
};
void operator |= (DrvHash::Kind & self, const DrvHash::Kind & other) noexcept;
typedef std::variant<
Hash, // regular DRV normalized hash
CaOutputHashes, // Fixed-output derivation hashes
DeferredHash // Deferred hashes for floating outputs drvs and their dependencies
> DrvHashModulo;
// Regular normalized derivation hash, and whether it was deferred (because
// an ancestor derivation is a floating content addressed derivation).
DrvHash,
// Fixed-output derivation hashes
CaOutputHashes
> DrvHashModuloRaw;
struct DrvHashModulo : DrvHashModuloRaw {
using Raw = DrvHashModuloRaw;
using Raw::Raw;
/* Get hash, throwing if it is per-output CA hashes or a
deferred Drv hash.
*/
const Hash & requireNoFixedNonDeferred() const;
inline const Raw & raw() const {
return static_cast<const Raw &>(*this);
}
};
/* Returns hashes with the details of fixed-output subderivations
expunged.