diff options
| -rw-r--r-- | src/nix/export.cc | 126 | ||||
| -rw-r--r-- | src/nix/flake.cc | 25 |
2 files changed, 151 insertions, 0 deletions
diff --git a/src/nix/export.cc b/src/nix/export.cc new file mode 100644 index 000000000..9e7816605 --- /dev/null +++ b/src/nix/export.cc @@ -0,0 +1,126 @@ +#include "command.hh" +#include "common-args.hh" +#include "shared.hh" +#include "store-api.hh" +#include "fs-accessor.hh" + +using namespace nix; + +struct CmdExport : InstallableCommand +{ + std::string exporter = "github:matthewbauer/nix-bundle"; + Path outLink; + + CmdExport() + { + addFlag({ + .longName = "exporter", + .description = "use custom exporter", + .labels = {"flake-url"}, + .handler = {&exporter}, + .completer = {[&](size_t, std::string_view prefix) { + completeFlakeRef(getStore(), prefix); + }} + }); + + addFlag({ + .longName = "out-link", + .shortName = 'o', + .description = "path of the symlink to the build result", + .labels = {"path"}, + .handler = {&outLink}, + .completer = completePath + }); + } + + std::string description() override + { + return "export an application out of the Nix store"; + } + + Examples examples() override + { + return { + Example{ + "To export Hello:", + "nix export hello" + }, + }; + } + + Strings getDefaultFlakeAttrPaths() override + { + Strings res{"defaultApp." + settings.thisSystem.get()}; + for (auto & s : SourceExprCommand::getDefaultFlakeAttrPaths()) + res.push_back(s); + return res; + } + + Strings getDefaultFlakeAttrPathPrefixes() override + { + Strings res{"apps." + settings.thisSystem.get() + ".", "packages"}; + for (auto & s : SourceExprCommand::getDefaultFlakeAttrPathPrefixes()) + res.push_back(s); + return res; + } + + void run(ref<Store> store) override + { + auto evalState = getEvalState(); + + auto app = installable->toApp(*evalState); + store->buildPaths(app.context); + + auto [exporterFlakeRef, exporterName] = parseFlakeRefWithFragment(exporter, absPath(".")); + const flake::LockFlags lockFlags{ .writeLockFile = false }; + auto exporter = InstallableFlake( + evalState, std::move(exporterFlakeRef), + Strings{exporterName == "" ? ("defaultExporter." + settings.thisSystem.get()) : exporterName}, + Strings({"exporters." + settings.thisSystem.get() + "."}), lockFlags); + + Value * arg = evalState->allocValue(); + evalState->mkAttrs(*arg, 1); + + PathSet context; + for (auto & i : app.context) + context.insert("=" + store->printStorePath(i.path)); + mkString(*evalState->allocAttr(*arg, evalState->symbols.create("program")), app.program, context); + + auto vRes = evalState->allocValue(); + evalState->callFunction(*exporter.toValue(*evalState).first, *arg, *vRes, noPos); + + if (!evalState->isDerivation(*vRes)) + throw Error("the exporter '%s' does not produce a derivation", exporter.what()); + + Bindings::iterator i = vRes->attrs->find(evalState->sDrvPath); + if (i == vRes->attrs->end()) + throw Error("the exporter '%s' does not produce a derivation", exporter.what()); + + PathSet context2; + StorePath drvPath = store->parseStorePath(evalState->coerceToPath(*i->pos, *i->value, context2)); + + i = vRes->attrs->find(evalState->sOutPath); + if (i == vRes->attrs->end()) + throw Error("the exporter '%s' does not produce a derivation", exporter.what()); + + StorePath outPath = store->parseStorePath(evalState->coerceToPath(*i->pos, *i->value, context2)); + + store->buildPaths({{drvPath}}); + + auto accessor = store->getFSAccessor(); + auto outPathS = store->printStorePath(outPath); + if (accessor->stat(outPathS).type != FSAccessor::tRegular) + throw Error("'%s' is not a file; an exporter must only create a single file", outPathS); + + auto info = store->queryPathInfo(outPath); + if (!info->references.empty()) + throw Error("'%s' has references; an exporter must not leave any references", outPathS); + + if (outLink == "") + outLink = baseNameOf(app.program); + + store.dynamic_pointer_cast<LocalFSStore>()->addPermRoot(outPath, absPath(outLink), true); + } +}; + +static auto r2 = registerCommand<CmdExport>("export"); diff --git a/src/nix/flake.cc b/src/nix/flake.cc index 027a9871e..db3ebdc2a 100644 --- a/src/nix/flake.cc +++ b/src/nix/flake.cc @@ -368,6 +368,21 @@ struct CmdFlakeCheck : FlakeCommand } }; + auto checkExporter = [&](const std::string & attrPath, Value & v, const Pos & pos) { + try { + state->forceValue(v, pos); + if (v.type != tLambda) + throw Error("exporter must be a function"); + if (!v.lambda.fun->formals || + v.lambda.fun->formals->argNames.find(state->symbols.create("program")) == v.lambda.fun->formals->argNames.end() || + v.lambda.fun->formals->argNames.find(state->symbols.create("args")) == v.lambda.fun->formals->argNames.end()) + throw Error("exporter must take formal arguments 'program' and 'args'"); + } catch (Error & e) { + e.addTrace(pos, hintfmt("while checking the template '%s'", attrPath)); + throw; + } + }; + { Activity act(*logger, lvlInfo, actUnknown, "evaluating flake"); @@ -490,6 +505,16 @@ struct CmdFlakeCheck : FlakeCommand *attr.value, *attr.pos); } + else if (name == "defaultExporter") + checkExporter(name, vOutput, pos); + + else if (name == "exporters") { + state->forceAttrs(vOutput, pos); + for (auto & attr : *vOutput.attrs) + checkExporter(fmt("%s.%s", name, attr.name), + *attr.value, *attr.pos); + } + else warn("unknown flake output '%s'", name); |