1 files changed, 142 insertions, 0 deletions
diff --git a/third_party/nix/src/libstore/nar-info.cc b/third_party/nix/src/libstore/nar-info.cc
new file mode 100644
index 000000000000..d42167dbfa69
--- /dev/null
+++ b/third_party/nix/src/libstore/nar-info.cc
@@ -0,0 +1,142 @@
+#include "libstore/nar-info.hh"
+
+#include <absl/strings/numbers.h>
+#include <absl/strings/str_split.h>
+
+#include "libstore/globals.hh"
+
+namespace nix {
+
+NarInfo::NarInfo(const Store& store, const std::string& s,
+                 const std::string& whence) {
+  auto corrupt = [&]() {
+    throw Error(format("NAR info file '%1%' is corrupt") % whence);
+  };
+
+  auto parseHashField = [&](const std::string& s) {
+    auto hash_ = Hash::deserialize(s);
+    if (hash_.ok()) {
+      return *hash_;
+    } else {
+      // TODO(#statusor): return an actual error
+      corrupt();
+      return Hash();
+    }
+  };
+
+  size_t pos = 0;
+  while (pos < s.size()) {
+    size_t colon = s.find(':', pos);
+    if (colon == std::string::npos) {
+      corrupt();
+    }
+
+    std::string name(s, pos, colon - pos);
+
+    size_t eol = s.find('\n', colon + 2);
+    if (eol == std::string::npos) {
+      corrupt();
+    }
+
+    std::string value(s, colon + 2, eol - colon - 2);
+
+    if (name == "StorePath") {
+      if (!store.isStorePath(value)) {
+        corrupt();
+      }
+      path = value;
+    } else if (name == "URL") {
+      url = value;
+    } else if (name == "Compression") {
+      compression = value;
+    } else if (name == "FileHash") {
+      fileHash = parseHashField(value);
+    } else if (name == "FileSize") {
+      if (!absl::SimpleAtoi(value, &fileSize)) {
+        corrupt();
+      }
+    } else if (name == "NarHash") {
+      narHash = parseHashField(value);
+    } else if (name == "NarSize") {
+      if (!absl::SimpleAtoi(value, &narSize)) {
+        corrupt();
+      }
+    } else if (name == "References") {
+      std::vector<std::string> refs =
+          absl::StrSplit(value, absl::ByChar(' '), absl::SkipEmpty());
+      if (!references.empty()) {
+        corrupt();
+      }
+      for (auto& r : refs) {
+        auto r2 = store.storeDir + "/" + r;
+        if (!store.isStorePath(r2)) {
+          corrupt();
+        }
+        references.insert(r2);
+      }
+    } else if (name == "Deriver") {
+      if (value != "unknown-deriver") {
+        auto p = store.storeDir + "/" + value;
+        if (!store.isStorePath(p)) {
+          corrupt();
+        }
+        deriver = p;
+      }
+    } else if (name == "System") {
+      system = value;
+    } else if (name == "Sig") {
+      sigs.insert(value);
+    } else if (name == "CA") {
+      if (!ca.empty()) {
+        corrupt();
+      }
+      ca = value;
+    }
+
+    pos = eol + 1;
+  }
+
+  if (compression.empty()) {
+    compression = "bzip2";
+  }
+
+  if (path.empty() || url.empty() || narSize == 0 || !narHash) {
+    corrupt();
+  }
+}
+
+std::string NarInfo::to_string() const {
+  std::string res;
+  res += "StorePath: " + path + "\n";
+  res += "URL: " + url + "\n";
+  assert(!compression.empty());
+  res += "Compression: " + compression + "\n";
+  assert(fileHash.type == htSHA256);
+  res += "FileHash: " + fileHash.to_string(Base32) + "\n";
+  res += "FileSize: " + std::to_string(fileSize) + "\n";
+  assert(narHash.type == htSHA256);
+  res += "NarHash: " + narHash.to_string(Base32) + "\n";
+  res += "NarSize: " + std::to_string(narSize) + "\n";
+
+  res += "References: " + concatStringsSep(" ", shortRefs()) + "\n";
+
+  if (!deriver.empty()) {
+    res += "Deriver: " + baseNameOf(deriver) + "\n";
+  }
+
+  if (!system.empty()) {
+    res += "System: " + system + "\n";
+  }
+
+  for (const auto& sig : sigs) {
+    res += "Sig: " + sig + "\n";
+  }
+
+  if (!ca.empty()) {
+    res += "CA: " + ca + "\n";
+  }
+
+  return res;
+}
+
+}  // namespace nix