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Simplify and document store path installable parsing

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This commit is contained in:
John Ericson 2022-12-13 13:00:34 -05:00
parent ce2f91d356
commit 8a3b1b7ced
1 changed files with 38 additions and 28 deletions
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66
src/libcmd/installables.cc
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@ -402,18 +402,6 @@ struct InstallableStorePath : Installable
ref<Store> store;
DerivedPath req;
InstallableStorePath(ref<Store> store, StorePath && storePath)
: store(store),
req(storePath.isDerivation()
? (DerivedPath) DerivedPath::Built {
.drvPath = std::move(storePath),
.outputs = {},
}
: (DerivedPath) DerivedPath::Opaque {
.path = std::move(storePath),
})
{ }
InstallableStorePath(ref<Store> store, DerivedPath && req)
: store(store), req(std::move(req))
{ }
@ -814,24 +802,46 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
for (auto & s : ss) {
std::exception_ptr ex;
auto found = s.rfind('^');
if (found != std::string::npos) {
try {
result.push_back(std::make_shared<InstallableStorePath>(
store,
DerivedPath::Built::parse(*store, s.substr(0, found), s.substr(found + 1))));
continue;
} catch (BadStorePath &) {
} catch (...) {
if (!ex)
ex = std::current_exception();
}
}
auto [prefix_, extendedOutputsSpec_] = ExtendedOutputsSpec::parse(s);
// To avoid clang's pedantry
auto prefix = std::move(prefix_);
auto extendedOutputsSpec = std::move(extendedOutputsSpec_);
found = s.find('/');
auto found = prefix.find('/');
if (found != std::string::npos) {
try {
result.push_back(std::make_shared<InstallableStorePath>(store, store->followLinksToStorePath(s)));
auto derivedPath = std::visit(overloaded {
// If the user did not use ^, we treat the output more liberally.
[&](const ExtendedOutputsSpec::Default &) -> DerivedPath {
// First, we accept a symlink chain or an actual store path.
auto storePath = store->followLinksToStorePath(prefix);
// Second, we see if the store path ends in `.drv` to decide what sort
// of derived path they want.
//
// This handling predates the `^` syntax. The `^*` in
// `/nix/store/hash-foo.drv^*` unambiguously means "do the
// `DerivedPath::Built` case", so plain `/nix/store/hash-foo.drv` could
// also unambiguously mean "do the DerivedPath::Opaque` case".
//
// Issue #7261 tracks reconsidering this `.drv` dispatching.
return storePath.isDerivation()
? (DerivedPath) DerivedPath::Built {
.drvPath = std::move(storePath),
.outputs = {},
}
: (DerivedPath) DerivedPath::Opaque {
.path = std::move(storePath),
};
},
// If the user did use ^, we just do exactly what is written.
[&](const ExtendedOutputsSpec::Explicit & outputSpec) -> DerivedPath {
return DerivedPath::Built {
.drvPath = store->parseStorePath(prefix),
.outputs = outputSpec,
};
},
}, extendedOutputsSpec.raw());
result.push_back(std::make_shared<InstallableStorePath>(store, std::move(derivedPath)));
continue;
} catch (BadStorePath &) {
} catch (...) {
@ -841,7 +851,7 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
}
try {
auto [flakeRef, fragment, extendedOutputsSpec] = parseFlakeRefWithFragmentAndExtendedOutputsSpec(s, absPath("."));
auto [flakeRef, fragment] = parseFlakeRefWithFragment(std::string { prefix }, absPath("."));
result.push_back(std::make_shared<InstallableFlake>(
this,
getEvalState(),