Nix/src/libexpr/value/context.hh
John Ericson 9121fed4b4 Fixing #7479
Types converted:

- `NixStringContextElem`
- `OutputsSpec`
- `ExtendedOutputsSpec`
- `DerivationOutput`
- `DerivationType`

Existing ones mostly conforming the pattern cleaned up:

- `ContentAddressMethod`
- `ContentAddressWithReferences`

The `DerivationGoal::derivationType` field had a bogus initialization,
now caught, so I made it `std::optional`. I think #8829 can make it
non-optional again because it will ensure we always have the derivation
when we construct a `DerivationGoal`.

See that issue (#7479) for details on the general goal.

`git grep 'Raw::Raw'` indicates the two types I didn't yet convert
`DerivedPath` and `BuiltPath` (and their `Single` variants) . This is
because @roberth and I (can't find issue right now...) plan on reworking
them somewhat, so I didn't want to churn them more just yet.

Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
2023-08-18 11:44:00 -04:00

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#pragma once
///@file
#include "util.hh"
#include "comparator.hh"
#include "derived-path.hh"
#include "variant-wrapper.hh"
#include <nlohmann/json_fwd.hpp>
namespace nix {
class BadNixStringContextElem : public Error
{
public:
std::string_view raw;
template<typename... Args>
BadNixStringContextElem(std::string_view raw_, const Args & ... args)
: Error("")
{
raw = raw_;
auto hf = hintfmt(args...);
err.msg = hintfmt("Bad String Context element: %1%: %2%", normaltxt(hf.str()), raw);
}
};
struct NixStringContextElem {
/**
* Plain opaque path to some store object.
*
* Encoded as just the path: <path>.
*/
using Opaque = SingleDerivedPath::Opaque;
/**
* Path to a derivation and its entire build closure.
*
* The path doesn't just refer to derivation itself and its closure, but
* also all outputs of all derivations in that closure (including the
* root derivation).
*
* Encoded in the form =<drvPath>.
*/
struct DrvDeep {
StorePath drvPath;
GENERATE_CMP(DrvDeep, me->drvPath);
};
/**
* Derivation output.
*
* Encoded in the form !<output>!<drvPath>.
*/
using Built = SingleDerivedPath::Built;
using Raw = std::variant<
Opaque,
DrvDeep,
Built
>;
Raw raw;
GENERATE_CMP(NixStringContextElem, me->raw);
MAKE_WRAPPER_CONSTRUCTOR(NixStringContextElem);
/**
* Decode a context string, one of:
* - <path>
* - =<path>
* - !<name>!<path>
*
* @param xpSettings Stop-gap to avoid globals during unit tests.
*/
static NixStringContextElem parse(
std::string_view s,
const ExperimentalFeatureSettings & xpSettings = experimentalFeatureSettings);
std::string to_string() const;
};
typedef std::set<NixStringContextElem> NixStringContext;
}