1 files changed, 83 insertions, 0 deletions
diff --git a/src/nix/copy.cc b/src/nix/copy.cc
new file mode 100644
index 000000000000..be51fee62712
--- /dev/null
+++ b/src/nix/copy.cc
@@ -0,0 +1,83 @@
+#include "command.hh"
+#include "shared.hh"
+#include "store-api.hh"
+#include "sync.hh"
+#include "thread-pool.hh"
+
+#include <atomic>
+
+using namespace nix;
+
+struct CmdCopy : StorePathsCommand
+{
+    std::string srcUri, dstUri;
+
+    CmdCopy()
+    {
+        mkFlag(0, "from", "store-uri", "URI of the source Nix store", &srcUri);
+        mkFlag(0, "to", "store-uri", "URI of the destination Nix store", &dstUri);
+    }
+
+    std::string name() override
+    {
+        return "copy";
+    }
+
+    std::string description() override
+    {
+        return "copy paths between Nix stores";
+    }
+
+    Examples examples() override
+    {
+        return {
+            Example{
+                "To copy Firefox to the local store to a binary cache in file:///tmp/cache:",
+                "nix copy --to file:///tmp/cache -r $(type -p firefox)"
+            },
+        };
+    }
+
+    void run(ref<Store> store, Paths storePaths) override
+    {
+        if (srcUri.empty() && dstUri.empty())
+            throw UsageError("you must pass ‘--from’ and/or ‘--to’");
+
+        ref<Store> srcStore = srcUri.empty() ? store : openStoreAt(srcUri);
+        ref<Store> dstStore = dstUri.empty() ? store : openStoreAt(dstUri);
+
+        std::string copiedLabel = "copied";
+
+        logger->setExpected(copiedLabel, storePaths.size());
+
+        ThreadPool pool;
+
+        processGraph<Path>(pool,
+            PathSet(storePaths.begin(), storePaths.end()),
+
+            [&](const Path & storePath) {
+                return srcStore->queryPathInfo(storePath)->references;
+            },
+
+            [&](const Path & storePath) {
+                checkInterrupt();
+
+                if (!dstStore->isValidPath(storePath)) {
+                    Activity act(*logger, lvlInfo, format("copying ‘%s’...") % storePath);
+
+                    StringSink sink;
+                    srcStore->exportPaths({storePath}, false, sink);
+
+                    StringSource source(*sink.s);
+                    dstStore->importPaths(false, source, 0);
+
+                    logger->incProgress(copiedLabel);
+                } else
+                    logger->incExpected(copiedLabel, -1);
+            });
+
+        pool.process();
+    }
+};
+
+static RegisterCommand r1(make_ref<CmdCopy>());