forked from lix-project/lix
85c8be6286
This was useful for an experiment with building Nix as a single compilation unit. It's not very useful otherwise but also doesn't hurt...
112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
#include "command.hh"
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#include "store-api.hh"
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#include "references.hh"
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#include "common-args.hh"
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#include "json.hh"
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using namespace nix;
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struct CmdMakeContentAddressable : StorePathsCommand, MixJSON
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{
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CmdMakeContentAddressable()
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{
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realiseMode = Realise::Outputs;
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}
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std::string description() override
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{
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return "rewrite a path or closure to content-addressable form";
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}
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Examples examples() override
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{
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return {
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Example{
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"To create a content-addressable representation of GNU Hello (but not its dependencies):",
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"nix make-content-addressable nixpkgs#hello"
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},
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Example{
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"To compute a content-addressable representation of the current NixOS system closure:",
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"nix make-content-addressable -r /run/current-system"
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},
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};
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}
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Category category() override { return catUtility; }
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void run(ref<Store> store, StorePaths storePaths) override
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{
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auto paths = store->topoSortPaths(StorePathSet(storePaths.begin(), storePaths.end()));
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std::reverse(paths.begin(), paths.end());
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std::map<StorePath, StorePath> remappings;
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auto jsonRoot = json ? std::make_unique<JSONObject>(std::cout) : nullptr;
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auto jsonRewrites = json ? std::make_unique<JSONObject>(jsonRoot->object("rewrites")) : nullptr;
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for (auto & path : paths) {
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auto pathS = store->printStorePath(path);
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auto oldInfo = store->queryPathInfo(path);
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std::string oldHashPart(path.hashPart());
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StringSink sink;
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store->narFromPath(path, sink);
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StringMap rewrites;
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StorePathSet references;
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bool hasSelfReference = false;
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for (auto & ref : oldInfo->references) {
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if (ref == path)
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hasSelfReference = true;
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else {
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auto i = remappings.find(ref);
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auto replacement = i != remappings.end() ? i->second : ref;
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// FIXME: warn about unremapped paths?
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if (replacement != ref)
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rewrites.insert_or_assign(store->printStorePath(ref), store->printStorePath(replacement));
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references.insert(std::move(replacement));
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}
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}
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*sink.s = rewriteStrings(*sink.s, rewrites);
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HashModuloSink hashModuloSink(htSHA256, oldHashPart);
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hashModuloSink((unsigned char *) sink.s->data(), sink.s->size());
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auto narHash = hashModuloSink.finish().first;
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ValidPathInfo info {
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store->makeFixedOutputPath(FileIngestionMethod::Recursive, narHash, path.name(), references, hasSelfReference),
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narHash,
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};
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info.references = std::move(references);
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if (hasSelfReference) info.references.insert(info.path);
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info.narSize = sink.s->size();
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info.ca = FixedOutputHash {
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.method = FileIngestionMethod::Recursive,
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.hash = info.narHash,
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};
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if (!json)
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printInfo("rewrote '%s' to '%s'", pathS, store->printStorePath(info.path));
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auto source = sinkToSource([&](Sink & nextSink) {
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RewritingSink rsink2(oldHashPart, std::string(info.path.hashPart()), nextSink);
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rsink2((unsigned char *) sink.s->data(), sink.s->size());
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rsink2.flush();
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});
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store->addToStore(info, *source);
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if (json)
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jsonRewrites->attr(store->printStorePath(path), store->printStorePath(info.path));
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remappings.insert_or_assign(std::move(path), std::move(info.path));
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}
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}
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};
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static auto rCmdMakeContentAddressable = registerCommand<CmdMakeContentAddressable>("make-content-addressable");
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