60b7121d2c
We want to be able to write down `foo.drv^bar.drv^baz`:
`foo.drv^bar.drv` is the dynamic derivation (since it is itself a
derivation output, `bar.drv` from `foo.drv`).
To that end, we create `Single{Derivation,BuiltPath}` types, that are
very similar except instead of having multiple outputs (in a set or
map), they have a single one. This is for everything to the left of the
rightmost `^`.
`NixStringContextElem` has an analogous change, and now can reuse
`SingleDerivedPath` at the top level. In fact, if we ever get rid of
`DrvDeep`, `NixStringContextElem` could be replaced with
`SingleDerivedPath` entirely!
Important note: some JSON formats have changed.
We already can *produce* dynamic derivations, but we can't refer to them
directly. Today, we can merely express building or example at the top
imperatively over time by building `foo.drv^bar.drv`, and then with a
second nix invocation doing `<result-from-first>^baz`, but this is not
declarative. The ethos of Nix of being able to write down the full plan
everything you want to do, and then execute than plan with a single
command, and for that we need the new inductive form of these types.
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
#include "path-with-outputs.hh"
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#include "store-api.hh"
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#include <regex>
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namespace nix {
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std::string StorePathWithOutputs::to_string(const Store & store) const
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{
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return outputs.empty()
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? store.printStorePath(path)
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: store.printStorePath(path) + "!" + concatStringsSep(",", outputs);
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}
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DerivedPath StorePathWithOutputs::toDerivedPath() const
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{
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if (!outputs.empty()) {
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return DerivedPath::Built {
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.drvPath = makeConstantStorePathRef(path),
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.outputs = OutputsSpec::Names { outputs },
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};
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} else if (path.isDerivation()) {
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assert(outputs.empty());
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return DerivedPath::Built {
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.drvPath = makeConstantStorePathRef(path),
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.outputs = OutputsSpec::All { },
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};
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} else {
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return DerivedPath::Opaque { path };
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}
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}
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std::vector<DerivedPath> toDerivedPaths(const std::vector<StorePathWithOutputs> ss)
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{
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std::vector<DerivedPath> reqs;
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for (auto & s : ss) reqs.push_back(s.toDerivedPath());
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return reqs;
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}
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StorePathWithOutputs::ParseResult StorePathWithOutputs::tryFromDerivedPath(const DerivedPath & p)
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{
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return std::visit(overloaded {
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[&](const DerivedPath::Opaque & bo) -> StorePathWithOutputs::ParseResult {
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if (bo.path.isDerivation()) {
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// drv path gets interpreted as "build", not "get drv file itself"
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return bo.path;
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}
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return StorePathWithOutputs { bo.path };
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},
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[&](const DerivedPath::Built & bfd) -> StorePathWithOutputs::ParseResult {
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return std::visit(overloaded {
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[&](const SingleDerivedPath::Opaque & bo) -> StorePathWithOutputs::ParseResult {
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return StorePathWithOutputs {
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.path = bo.path,
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// Use legacy encoding of wildcard as empty set
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.outputs = std::visit(overloaded {
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[&](const OutputsSpec::All &) -> StringSet {
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return {};
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},
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[&](const OutputsSpec::Names & outputs) {
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return static_cast<StringSet>(outputs);
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},
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}, bfd.outputs.raw()),
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};
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},
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[&](const SingleDerivedPath::Built &) -> StorePathWithOutputs::ParseResult {
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return std::monostate {};
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},
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}, bfd.drvPath->raw());
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},
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}, p.raw());
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}
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std::pair<std::string_view, StringSet> parsePathWithOutputs(std::string_view s)
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{
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size_t n = s.find("!");
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return n == s.npos
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? std::make_pair(s, std::set<std::string>())
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: std::make_pair(s.substr(0, n),
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tokenizeString<std::set<std::string>>(s.substr(n + 1), ","));
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}
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StorePathWithOutputs parsePathWithOutputs(const Store & store, std::string_view pathWithOutputs)
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{
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auto [path, outputs] = parsePathWithOutputs(pathWithOutputs);
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return StorePathWithOutputs { store.parseStorePath(path), std::move(outputs) };
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}
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StorePathWithOutputs followLinksToStorePathWithOutputs(const Store & store, std::string_view pathWithOutputs)
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{
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auto [path, outputs] = parsePathWithOutputs(pathWithOutputs);
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return StorePathWithOutputs { store.followLinksToStorePath(path), std::move(outputs) };
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}
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}
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