forked from lix-project/lix
91 lines
3 KiB
C++
91 lines
3 KiB
C++
#include "command.hh"
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#include "store-api.hh"
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#include "references.hh"
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using namespace nix;
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struct CmdMakeContentAddressable : StorePathsCommand
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{
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CmdMakeContentAddressable()
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{
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realiseMode = Build;
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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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void run(ref<Store> store, Paths storePaths) override
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{
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auto paths = store->topoSortPaths(PathSet(storePaths.begin(), storePaths.end()));
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paths.reverse();
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std::map<Path, Path> remappings;
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for (auto & path : paths) {
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auto oldInfo = store->queryPathInfo(path);
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auto oldHashPart = storePathToHash(path);
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auto name = storePathToName(path);
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StringSink sink;
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store->narFromPath(path, sink);
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StringMap rewrites;
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ValidPathInfo info;
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for (auto & ref : oldInfo->references) {
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if (ref == path)
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info.references.insert("self");
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else {
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auto replacement = get(remappings, ref, ref);
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// FIXME: warn about unremapped paths?
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info.references.insert(replacement);
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if (replacement != ref)
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rewrites[storePathToHash(ref)] = storePathToHash(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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info.narHash = hashModuloSink.finish().first;
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info.narSize = sink.s->size();
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replaceInSet(info.references, path, std::string("self"));
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info.path = store->makeFixedOutputPath(true, info.narHash, name, info.references);
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replaceInSet(info.references, std::string("self"), info.path);
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info.ca = makeFixedOutputCA(true, info.narHash);
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printError("rewrote '%s' to '%s'", path, info.path);
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auto source = sinkToSource([&](Sink & nextSink) {
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RewritingSink rsink2(oldHashPart, storePathToHash(info.path), 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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remappings[path] = info.path;
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}
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}
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};
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static auto r1 = registerCommand<CmdMakeContentAddressable>("make-content-addressable");
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