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Create EvalState::coerceToDerivedPath

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This gives us some round trips to test.

`EvalState::coerceToDerivedPathUnchecked` is a factored out helper just
for unit testing.
This commit is contained in:
John Ericson 2023-05-10 19:25:52 -04:00
parent 8e1a990268
commit 5a23b80b0a
3 changed files with 162 additions and 0 deletions
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23
src/libexpr/eval.hh
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@ -21,6 +21,7 @@ namespace nix {
class Store;
class EvalState;
class StorePath;
struct DerivedPath;
enum RepairFlag : bool;
@ -473,6 +474,28 @@ public:
*/
StorePath coerceToStorePath(const PosIdx pos, Value & v, NixStringContext & context, std::string_view errorCtx);
/**
* Part of `coerceToDerivedPath()` without any store IO which is exposed for unit testing only.
*/
std::pair<DerivedPath, std::string_view> coerceToDerivedPathUnchecked(const PosIdx pos, Value & v, std::string_view errorCtx);
/**
* Coerce to `DerivedPath`.
*
* Must be a string which is either a literal store path or a
* "placeholder (see `downstreamPlaceholder()`).
*
* Even more importantly, the string context must be exactly one
* element, which is either a `NixStringContextElem::Opaque` or
* `NixStringContextElem::Built`. (`NixStringContextEleme::DrvDeep`
* is not permitted).
*
* The string is parsed based on the context --- the context is the
* source of truth, and ultimately tells us what we want, and then
* we ensure the string corresponds to it.
*/
DerivedPath coerceToDerivedPath(const PosIdx pos, Value & v, std::string_view errorCtx);
public:
/**