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Stratify ExtraPathInfo along Installable hierarchy

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Instead of having a bunch of optional fields, have a few subclasses
which can have mandatory fields.

Additionally, the new `getExtraPathInfo`, and `nixpkgsFlakeRef`, are
moved to `InstallableValue`.

I did these things because https://github.com/NixOS/rfcs/pull/134 ; with
these things moved to `InstallableValue`, the base `Installable` no
longer depends on libexpr! This is a major step towards that.

Also, add a bunch of doc comments for sake of the internal API docs.
This commit is contained in:
John Ericson 2023-02-05 23:28:18 -05:00
parent e00abd3f56
commit 256f3e3063
12 changed files with 254 additions and 76 deletions
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30
src/libcmd/installable-flake.hh
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@ -4,6 +4,30 @@
namespace nix {
/**
* Extra info about a \ref DerivedPath "derived path" that ultimately
* come from a Flake.
*
* Invariant: every ExtraPathInfo gotten from an InstallableFlake should
* be possible to downcast to an ExtraPathInfoFlake.
*/
struct ExtraPathInfoFlake : ExtraPathInfoValue
{
/**
* Extra struct to get around C++ designated initializer limitations
*/
struct Flake {
FlakeRef originalRef;
FlakeRef resolvedRef;
};
Flake flake;
ExtraPathInfoFlake(Value && v, Flake && f)
: ExtraPathInfoValue(std::move(v)), flake(f)
{ }
};
struct InstallableFlake : InstallableValue
{
FlakeRef flakeRef;
@ -33,8 +57,10 @@ struct InstallableFlake : InstallableValue
std::pair<Value *, PosIdx> toValue(EvalState & state) override;
/* Get a cursor to every attrpath in getActualAttrPaths()
that exists. However if none exists, throw an exception. */
/**
* Get a cursor to every attrpath in getActualAttrPaths() that
* exists. However if none exists, throw an exception.
*/
std::vector<ref<eval_cache::AttrCursor>>
getCursors(EvalState & state) override;