diff --git a/common/file_fetcher.cc b/common/file_fetcher.cc
index 3836e54..7134fd6 100644
--- a/common/file_fetcher.cc
+++ b/common/file_fetcher.cc
@@ -43,8 +43,9 @@
 // static
 bool FileFetcher::SupportedUrl(const string& url) {
   // Note that we require the file path to start with a "/".
-  return base::StartsWith(
-      url, "file:///", base::CompareCase::INSENSITIVE_ASCII);
+  return (
+      base::StartsWith(url, "file:///", base::CompareCase::INSENSITIVE_ASCII) ||
+      base::StartsWith(url, "fd://", base::CompareCase::INSENSITIVE_ASCII));
 }
 
 FileFetcher::~FileFetcher() {
@@ -67,12 +68,20 @@
     return;
   }
 
-  string file_path = url.substr(strlen("file://"));
-  stream_ =
-      brillo::FileStream::Open(base::FilePath(file_path),
-                               brillo::Stream::AccessMode::READ,
-                               brillo::FileStream::Disposition::OPEN_EXISTING,
-                               nullptr);
+  string file_path;
+
+  if (base::StartsWith(url, "fd://", base::CompareCase::INSENSITIVE_ASCII)) {
+    int fd = std::stoi(url.substr(strlen("fd://")));
+    file_path = url;
+    stream_ = brillo::FileStream::FromFileDescriptor(fd, false, nullptr);
+  } else {
+    file_path = url.substr(strlen("file://"));
+    stream_ =
+        brillo::FileStream::Open(base::FilePath(file_path),
+                                 brillo::Stream::AccessMode::READ,
+                                 brillo::FileStream::Disposition::OPEN_EXISTING,
+                                 nullptr);
+  }
 
   if (!stream_) {
     LOG(ERROR) << "Couldn't open " << file_path;
@@ -183,5 +192,4 @@
   transfer_in_progress_ = false;
   transfer_paused_ = false;
 }
-
 }  // namespace chromeos_update_engine
diff --git a/common/utils.cc b/common/utils.cc
index 34d97a2..e7b6975 100644
--- a/common/utils.cc
+++ b/common/utils.cc
@@ -1064,6 +1064,16 @@
   }
 }
 
+string GetFilePath(int fd) {
+  base::FilePath proc("/proc/self/fd/" + std::to_string(fd));
+  base::FilePath file_name;
+
+  if (!base::ReadSymbolicLink(proc, &file_name)) {
+    return "not found";
+  }
+  return file_name.value();
+}
+
 }  // namespace utils
 
 }  // namespace chromeos_update_engine
diff --git a/common/utils.h b/common/utils.h
index 9160d9f..9dca9e8 100644
--- a/common/utils.h
+++ b/common/utils.h
@@ -304,6 +304,9 @@
 // reboot. Returns whether it succeeded getting the boot_id.
 bool GetBootId(std::string* boot_id);
 
+// This function gets the file path of the file pointed to by FileDiscriptor.
+std::string GetFilePath(int fd);
+
 // Divide |x| by |y| and round up to the nearest integer.
 constexpr uint64_t DivRoundUp(uint64_t x, uint64_t y) {
   return (x + y - 1) / y;
diff --git a/common/utils_unittest.cc b/common/utils_unittest.cc
index 7d1c59e..b4ac2f5 100644
--- a/common/utils_unittest.cc
+++ b/common/utils_unittest.cc
@@ -507,4 +507,13 @@
   ExpectInvalidParseRollbackKeyVersion("1.99999");
 }
 
+TEST(UtilsTest, GetFilePathTest) {
+  test_utils::ScopedTempFile file;
+  int fd = HANDLE_EINTR(open(file.path().c_str(), O_RDONLY));
+  EXPECT_GE(fd, 0);
+  EXPECT_EQ(file.path(), utils::GetFilePath(fd));
+  EXPECT_EQ("not found", utils::GetFilePath(-1));
+  IGNORE_EINTR(close(fd));
+}
+
 }  // namespace chromeos_update_engine