forked from lix-project/lix
133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
#include "command.hh"
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#include "progress-bar.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "sync.hh"
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#include "thread-pool.hh"
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#include <atomic>
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using namespace nix;
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struct CmdCopy : StorePathsCommand
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{
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std::string srcUri, dstUri;
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CmdCopy()
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{
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mkFlag(0, "from", "store-uri", "URI of the source Nix store", &srcUri);
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mkFlag(0, "to", "store-uri", "URI of the destination Nix store", &dstUri);
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}
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std::string name() override
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{
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return "copy";
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}
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std::string description() override
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{
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return "copy paths between Nix stores";
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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 copy Firefox to the local store to a binary cache in file:///tmp/cache:",
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"nix copy --to file:///tmp/cache -r $(type -p firefox)"
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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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if (srcUri.empty() && dstUri.empty())
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throw UsageError("you must pass ‘--from’ and/or ‘--to’");
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ref<Store> srcStore = srcUri.empty() ? store : openStoreAt(srcUri);
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ref<Store> dstStore = dstUri.empty() ? store : openStoreAt(dstUri);
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ProgressBar progressBar;
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std::atomic<size_t> done{0};
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std::atomic<size_t> total{storePaths.size()};
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auto showProgress = [&]() {
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return (format("[%d/%d copied]") % done % total).str();
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};
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progressBar.updateStatus(showProgress());
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struct Graph
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{
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std::set<Path> left;
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std::map<Path, std::set<Path>> refs, rrefs;
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};
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Sync<Graph> graph_;
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{
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auto graph(graph_.lock());
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graph->left = PathSet(storePaths.begin(), storePaths.end());
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}
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ThreadPool pool;
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std::function<void(const Path &)> doPath;
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doPath = [&](const Path & storePath) {
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checkInterrupt();
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if (!dstStore->isValidPath(storePath)) {
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auto activity(progressBar.startActivity(format("copying ‘%s’...") % storePath));
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StringSink sink;
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srcStore->exportPaths({storePath}, false, sink);
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StringSource source(*sink.s);
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dstStore->importPaths(false, source, 0);
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done++;
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} else
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total--;
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progressBar.updateStatus(showProgress());
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/* Enqueue all paths that were waiting for this one. */
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{
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auto graph(graph_.lock());
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graph->left.erase(storePath);
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for (auto & rref : graph->rrefs[storePath]) {
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auto & refs(graph->refs[rref]);
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auto i = refs.find(storePath);
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assert(i != refs.end());
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refs.erase(i);
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if (refs.empty())
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pool.enqueue(std::bind(doPath, rref));
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}
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}
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};
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/* Build the dependency graph; enqueue all paths with no
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dependencies. */
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for (auto & storePath : storePaths) {
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auto info = srcStore->queryPathInfo(storePath);
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{
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auto graph(graph_.lock());
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for (auto & ref : info->references)
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if (ref != storePath && graph->left.count(ref)) {
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graph->refs[storePath].insert(ref);
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graph->rrefs[ref].insert(storePath);
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}
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if (graph->refs[storePath].empty())
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pool.enqueue(std::bind(doPath, storePath));
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}
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}
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pool.process();
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progressBar.done();
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}
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};
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static RegisterCommand r1(make_ref<CmdCopy>());
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