From a705e8ce0a8aaf3afe885892834468e95c197a16 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Fri, 2 Sep 2016 14:24:34 -0400
Subject: Factor a general remote FS accessor out of BinaryCacheStore

---
 src/libstore/remote-fs-accessor.cc | 57 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 src/libstore/remote-fs-accessor.cc

(limited to 'src/libstore/remote-fs-accessor.cc')

diff --git a/src/libstore/remote-fs-accessor.cc b/src/libstore/remote-fs-accessor.cc
new file mode 100644
index 000000000..ca14057c2
--- /dev/null
+++ b/src/libstore/remote-fs-accessor.cc
@@ -0,0 +1,57 @@
+#include "remote-fs-accessor.hh"
+#include "nar-accessor.hh"
+
+namespace nix {
+
+
+RemoteFSAccessor::RemoteFSAccessor(ref<Store> store)
+    : store(store)
+{
+}
+
+std::pair<ref<FSAccessor>, Path> RemoteFSAccessor::fetch(const Path & path_)
+{
+    auto path = canonPath(path_);
+
+    auto storePath = store->toStorePath(path);
+    std::string restPath = std::string(path, storePath.size());
+
+    if (!store->isValidPath(storePath))
+        throw InvalidPath(format("path ‘%1%’ is not a valid store path") % storePath);
+
+    auto i = nars.find(storePath);
+    if (i != nars.end()) return {i->second, restPath};
+
+    StringSink sink;
+    store->narFromPath(storePath, sink);
+
+    auto accessor = makeNarAccessor(sink.s);
+    nars.emplace(storePath, accessor);
+    return {accessor, restPath};
+}
+
+FSAccessor::Stat RemoteFSAccessor::stat(const Path & path)
+{
+    auto res = fetch(path);
+    return res.first->stat(res.second);
+}
+
+StringSet RemoteFSAccessor::readDirectory(const Path & path)
+{
+    auto res = fetch(path);
+    return res.first->readDirectory(res.second);
+}
+
+std::string RemoteFSAccessor::readFile(const Path & path)
+{
+    auto res = fetch(path);
+    return res.first->readFile(res.second);
+}
+
+std::string RemoteFSAccessor::readLink(const Path & path)
+{
+    auto res = fetch(path);
+    return res.first->readLink(res.second);
+}
+
+}
-- 
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