Add Store::dumpPath() method

This allows applying nix-store --verify-path to binary cache stores:

  NIX_REMOTE=https://cache.nixos.org nix-store --verify-path /nix/store/s5c7...

1 files changed, 5 insertions, 0 deletions

diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index 72b0b0f032db..9a2c9daca08c 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -215,6 +215,9 @@ public:
     virtual Path addTextToStore(const string & name, const string & s,
         const PathSet & references, bool repair = false) = 0;
 
+    /* Write a NAR dump of a store path. */
+    virtual void dumpPath(const Path & path, Sink & sink) = 0;
+
     /* Export a store path, that is, create a NAR dump of the store
        path and append its references and its deriver.  Optionally, a
        cryptographic signature (created by OpenSSL) of the preceding
@@ -354,6 +357,8 @@ public:
 
 class LocalFSStore : public Store
 {
+public:
+    void dumpPath(const Path & path, Sink & sink) override;
     ref<FSAccessor> getFSAccessor() override;
 };