Image mount fails if socket directory not present

When trying to mount virtual media image in Legacy mode
nbd tries to create unix socket and if the parent directory
does not exist mount fails.
Also used noexcept versions of filesystem operations.

Tested:
Locally, by manually removing the socket's parent folder and
mounting an image in Legacy mode (Samba).

Change-Id: If5beb7add655e09a60511b30e4edbd34c8c15ec5
Signed-off-by: Anna Platash <anna.platash@intel.com>
Signed-off-by: Czarnowski, Przemyslaw <przemyslaw.hawrylewicz.czarnowski@intel.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/state/activating_state.cpp b/src/state/activating_state.cpp
index 9cbd324..15d7214 100644
--- a/src/state/activating_state.cpp
+++ b/src/state/activating_state.cpp
@@ -11,6 +11,7 @@
 #include <boost/container/flat_map.hpp>
 #include <boost/container/flat_set.hpp>
 #include <boost/process.hpp>
+#include <boost/system/detail/error_code.hpp>
 #include <filesystem>
 #include <iostream>
 #include <memory>
@@ -82,6 +83,36 @@ std::unique_ptr<BasicState> ActivatingState::activateLegacyMode()
            " Mount requested on address: ", machine.getTarget()->imgUrl,
            " ; RW: ", machine.getTarget()->rw);
 
+    std::filesystem::path socketPath(machine.getConfig().unixSocket);
+    if (!std::filesystem::exists(socketPath.parent_path()))
+    {
+        LogMsg(Logger::Debug, machine.getName(),
+               " Parent path for the socket does not exist, ",
+               socketPath.parent_path());
+
+        std::error_code errc;
+        std::filesystem::create_directories(socketPath.parent_path(), errc);
+        if (errc)
+        {
+            LogMsg(Logger::Debug, machine.getName(),
+                   " Failed to create parent directory for socket", errc);
+            return std::make_unique<ReadyState>(
+                machine, static_cast<std::errc>(errc.value()),
+                "Failed to create parent directory for socket");
+        }
+        std::filesystem::permissions(socketPath.parent_path(),
+                                     std::filesystem::perms::owner_all, errc);
+        if (errc)
+        {
+            LogMsg(Logger::Debug, machine.getName(),
+                   " Failed to set parent directory permissions for socket",
+                   errc);
+            return std::make_unique<ReadyState>(
+                machine, static_cast<std::errc>(errc.value()),
+                "Failed to set parent permissions directory for socket");
+        }
+    }
+
     if (isCifsUrl(machine.getTarget()->imgUrl))
     {
         return mountSmbShare();