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Generalize isFixedOutput in preparation for CA drvs

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Today's fixed output derivations and regular derivations differ in a few
ways which are largely orthogonal. This replaces `isFixedOutput` with a
`type` that returns an enum of possible combinations.
This commit is contained in:
John Ericson 2020-03-15 02:23:17 -04:00
parent b79b81dd2d
commit 2be64efb02
4 changed files with 106 additions and 40 deletions
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18
src/libstore/derivations.hh
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@ -22,6 +22,7 @@ struct DerivationOutput
, hashAlgo(std::move(hashAlgo))
, hash(std::move(hash))
{ }
void parseHashType(bool & recursive, HashType & hashType) const;
void parseHashInfo(bool & recursive, Hash & hash) const;
};
@ -33,6 +34,21 @@ typedef std::map<StorePath, StringSet> DerivationInputs;
typedef std::map<string, string> StringPairs;
// Bit:
// 7: regular vs ca
// 6: floating vs fixed hash if ca, regular always floating
// 5: pure vs impure if ca, regular always pure
// _: Unassigned
enum DerivationTypeAxis : uint8_t {
DtAxisCA = 0b10000000,
DtAxisFixed = 0b01000000,
DtAxisImpure = 0b00100000,
};
enum DerivationType : uint8_t {
DtRegular = 0b0000000,
DtCAFixed = 0b11100000,
};
struct BasicDerivation
{
DerivationOutputs outputs; /* keyed on symbolic IDs */
@ -53,7 +69,7 @@ struct BasicDerivation
bool isBuiltin() const;
/* Return true iff this is a fixed-output derivation. */
bool isFixedOutput() const;
DerivationType type() const;
/* Return the output paths of a derivation. */
StorePathSet outputPaths() const;