forked from lix-project/lix
129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
#include "store-api.hh"
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#include "archive.hh"
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#include "worker-protocol.hh"
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#include <algorithm>
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namespace nix {
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struct HashAndWriteSink : Sink
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{
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Sink & writeSink;
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HashSink hashSink;
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HashAndWriteSink(Sink & writeSink) : writeSink(writeSink), hashSink(htSHA256)
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{
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}
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virtual void operator () (const unsigned char * data, size_t len)
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{
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writeSink(data, len);
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hashSink(data, len);
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}
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Hash currentHash()
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{
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return hashSink.currentHash().first;
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}
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};
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void Store::exportPaths(const Paths & paths, Sink & sink)
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{
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Paths sorted = topoSortPaths(PathSet(paths.begin(), paths.end()));
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std::reverse(sorted.begin(), sorted.end());
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std::string doneLabel("paths exported");
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logger->incExpected(doneLabel, sorted.size());
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for (auto & path : sorted) {
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Activity act(*logger, lvlInfo, format("exporting path ‘%s’") % path);
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sink << 1;
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exportPath(path, sink);
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logger->incProgress(doneLabel);
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}
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sink << 0;
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}
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void Store::exportPath(const Path & path, Sink & sink)
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{
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auto info = queryPathInfo(path);
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HashAndWriteSink hashAndWriteSink(sink);
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narFromPath(path, hashAndWriteSink);
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/* Refuse to export paths that have changed. This prevents
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filesystem corruption from spreading to other machines.
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Don't complain if the stored hash is zero (unknown). */
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Hash hash = hashAndWriteSink.currentHash();
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if (hash != info->narHash && info->narHash != Hash(info->narHash.type))
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throw Error(format("hash of path ‘%1%’ has changed from ‘%2%’ to ‘%3%’!") % path
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% printHash(info->narHash) % printHash(hash));
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hashAndWriteSink << exportMagic << path << info->references << info->deriver << 0;
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}
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struct TeeSource : Source
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{
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Source & readSource;
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ref<std::string> data;
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TeeSource(Source & readSource)
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: readSource(readSource)
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, data(make_ref<std::string>())
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{
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}
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size_t read(unsigned char * data, size_t len)
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{
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size_t n = readSource.read(data, len);
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this->data->append((char *) data, n);
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return n;
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}
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};
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struct NopSink : ParseSink
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{
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};
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Paths Store::importPaths(Source & source, std::shared_ptr<FSAccessor> accessor, bool dontCheckSigs)
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{
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Paths res;
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while (true) {
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unsigned long long n = readLongLong(source);
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if (n == 0) break;
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if (n != 1) throw Error("input doesn't look like something created by ‘nix-store --export’");
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/* Extract the NAR from the source. */
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TeeSource tee(source);
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NopSink sink;
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parseDump(sink, tee);
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uint32_t magic = readInt(source);
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if (magic != exportMagic)
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throw Error("Nix archive cannot be imported; wrong format");
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ValidPathInfo info;
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info.path = readStorePath(*this, source);
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Activity act(*logger, lvlInfo, format("importing path ‘%s’") % info.path);
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info.references = readStorePaths<PathSet>(*this, source);
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info.deriver = readString(source);
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if (info.deriver != "") assertStorePath(info.deriver);
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info.narHash = hashString(htSHA256, *tee.data);
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info.narSize = tee.data->size();
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// Ignore optional legacy signature.
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if (readInt(source) == 1)
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readString(source);
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addToStore(info, tee.data, false, dontCheckSigs, accessor);
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res.push_back(info.path);
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}
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return res;
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}
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}
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