1 files changed, 85 insertions, 0 deletions
diff --git a/src/nix/path-info.cc b/src/nix/path-info.cc
new file mode 100644
index 000000000000..c61fe7ff1e00
--- /dev/null
+++ b/src/nix/path-info.cc
@@ -0,0 +1,85 @@
+#include "command.hh"
+#include "shared.hh"
+#include "store-api.hh"
+
+#include <iomanip>
+#include <algorithm>
+
+using namespace nix;
+
+struct CmdPathInfo : StorePathsCommand
+{
+    bool showSize = false;
+    bool showClosureSize = false;
+    bool showSigs = false;
+
+    CmdPathInfo()
+    {
+        mkFlag('s', "size", "print size of the NAR dump of each path", &showSize);
+        mkFlag('S', "closure-size", "print sum size of the NAR dumps of the closure of each path", &showClosureSize);
+        mkFlag(0, "sigs", "show signatures", &showSigs);
+    }
+
+    std::string name() override
+    {
+        return "path-info";
+    }
+
+    std::string description() override
+    {
+        return "query information about store paths";
+    }
+
+    Examples examples() override
+    {
+        return {
+            Example{
+                "To show the closure sizes of every path in the current NixOS system closure, sorted by size:",
+                "nix path-info -rS /run/current-system | sort -nk2"
+            },
+            Example{
+                "To check the existence of a path in a binary cache:",
+                "nix path-info -r /nix/store/7qvk5c91...-geeqie-1.1 --store https://cache.nixos.org/"
+            },
+        };
+    }
+
+    void run(ref<Store> store, Paths storePaths) override
+    {
+        size_t pathLen = 0;
+        for (auto & storePath : storePaths)
+            pathLen = std::max(pathLen, storePath.size());
+
+        for (auto storePath : storePaths) {
+            auto info = store->queryPathInfo(storePath);
+            storePath = info->path; // FIXME: screws up padding
+
+            std::cout << storePath << std::string(std::max(0, (int) pathLen - (int) storePath.size()), ' ');
+
+            if (showSize) {
+                std::cout << '\t' << std::setw(11) << info->narSize;
+            }
+
+            if (showClosureSize) {
+                size_t totalSize = 0;
+                PathSet closure;
+                store->computeFSClosure(storePath, closure, false, false);
+                for (auto & p : closure)
+                    totalSize += store->queryPathInfo(p)->narSize;
+                std::cout << '\t' << std::setw(11) << totalSize;
+            }
+
+            if (showSigs) {
+                std::cout << '\t';
+                Strings ss;
+                if (info->ultimate) ss.push_back("ultimate");
+                for (auto & sig : info->sigs) ss.push_back(sig);
+                std::cout << concatStringsSep(" ", ss);
+            }
+
+            std::cout << std::endl;
+        }
+    }
+};
+
+static RegisterCommand r1(make_ref<CmdPathInfo>());