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Clean up DerivationOutput, and headers

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1. `DerivationOutput` now as the `std::variant` as a base class. And the
   variants are given hierarchical names under `DerivationOutput`.

   In 8e0d0689be @matthewbauer and I
   didn't know a better idiom, and so we made it a field. But this sort
   of "newtype" is anoying for literals downstream.

   Since then we leaned the base class, inherit the constructors trick,
   e.g. used in `DerivedPath`. Switching to use that makes this more
   ergonomic, and consistent.

2. `store-api.hh` and `derivations.hh` are now independent.

   In bcde5456cc I swapped the dependency,
   but I now know it is better to just keep on using incomplete types as
   much as possible for faster compilation and good separation of
   concerns.
This commit is contained in:
John Ericson 2022-03-17 22:29:15 +00:00
parent 6afc361798
commit 197feed51d
16 changed files with 113 additions and 103 deletions
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35
src/libstore/derivations.hh
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@ -4,6 +4,7 @@
#include "types.hh"
#include "hash.hh"
#include "content-address.hh"
#include "repair-flag.hh"
#include "sync.hh"
#include <map>
@ -44,19 +45,31 @@ struct DerivationOutputCAFloating
*/
struct DerivationOutputDeferred {};
struct DerivationOutput
typedef std::variant<
DerivationOutputInputAddressed,
DerivationOutputCAFixed,
DerivationOutputCAFloating,
DerivationOutputDeferred
> _DerivationOutputRaw;
struct DerivationOutput : _DerivationOutputRaw
{
std::variant<
DerivationOutputInputAddressed,
DerivationOutputCAFixed,
DerivationOutputCAFloating,
DerivationOutputDeferred
> output;
using Raw = _DerivationOutputRaw;
using Raw::Raw;
using InputAddressed = DerivationOutputInputAddressed;
using CAFixed = DerivationOutputCAFixed;
using CAFloating = DerivationOutputCAFloating;
using Deferred = DerivationOutputDeferred;
/* Note, when you use this function you should make sure that you're passing
the right derivation name. When in doubt, you should use the safer
interface provided by BasicDerivation::outputsAndOptPaths */
std::optional<StorePath> path(const Store & store, std::string_view drvName, std::string_view outputName) const;
inline const Raw & raw() const {
return static_cast<const Raw &>(*this);
}
};
typedef std::map<std::string, DerivationOutput> DerivationOutputs;
@ -150,8 +163,6 @@ struct Derivation : BasicDerivation
class Store;
enum RepairFlag : bool { NoRepair = false, Repair = true };
/* Write a derivation to the Nix store, and return its path. */
StorePath writeDerivation(Store & store,
const Derivation & drv,
@ -197,10 +208,10 @@ typedef std::variant<
DrvHash,
// Fixed-output derivation hashes
CaOutputHashes
> DrvHashModuloRaw;
> _DrvHashModuloRaw;
struct DrvHashModulo : DrvHashModuloRaw {
using Raw = DrvHashModuloRaw;
struct DrvHashModulo : _DrvHashModuloRaw {
using Raw = _DrvHashModuloRaw;
using Raw::Raw;
/* Get hash, throwing if it is per-output CA hashes or a