From 2da6a424486e16b4b30e448a15a9b4a608df602d Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 4 May 2017 14:16:26 +0200
Subject: nix dump-path: Add

This is primarily useful for extracting NARs from other stores (like
binary caches), which "nix-store --dump" cannot do.
---
 src/nix/dump-path.cc | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 src/nix/dump-path.cc

(limited to 'src/nix/dump-path.cc')

diff --git a/src/nix/dump-path.cc b/src/nix/dump-path.cc
new file mode 100644
index 000000000..1a1866437
--- /dev/null
+++ b/src/nix/dump-path.cc
@@ -0,0 +1,35 @@
+#include "command.hh"
+#include "store-api.hh"
+
+using namespace nix;
+
+struct CmdDumpPath : StorePathCommand
+{
+    std::string name() override
+    {
+        return "dump-path";
+    }
+
+    std::string description() override
+    {
+        return "dump a store path to stdout (in NAR format)";
+    }
+
+    Examples examples() override
+    {
+        return {
+            Example{
+                "To get a NAR from the binary cache https://cache.nixos.org/:",
+                "nix dump-path --store https://cache.nixos.org/ /nix/store/7crrmih8c52r8fbnqb933dxrsp44md93-glibc-2.25"
+            },
+        };
+    }
+
+    void run(ref<Store> store, const Path & storePath) override
+    {
+        FdSink sink(STDOUT_FILENO);
+        store->narFromPath(storePath, sink);
+    }
+};
+
+static RegisterCommand r1(make_ref<CmdDumpPath>());
-- 
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