[libcalamares] Add convenience createTargetParentDirs()

src/libcalamares/utils/CalamaresUtilsSystem.cpp

@@ -378,6 +378,12 @@ System::createTargetDirs( const QString& path ) const
     return d.mkpath( target );  // This re-does everything starting from the **host** /
 }
 
+bool
+System::createTargetParentDirs( const QString& filePath ) const
+{
+    return createTargetDirs( QFileInfo( filePath ).dir().path() );
+}
+
 
 QPair< quint64, float >
 System::getTotalMemoryB() const

src/libcalamares/utils/CalamaresUtilsSystem.h

@@ -255,17 +255,24 @@ public:
      */
     DLLEXPORT void removeTargetFile( const QString& path ) const;
 
-    /** @brief Ensure that the directories above @p path exist
+    /** @brief Ensure that the directory @p path exists
      *
      * @param path a full pathname to a desired directory.
      *
      * All the directory components including the last path component are
-     * created, as needed, with 0755 permissions. Returns true on success.
+     * created, as needed. Returns true on success.
      *
      * @see QDir::mkpath
      */
     DLLEXPORT bool createTargetDirs( const QString& path ) const;
 
+    /** @brief Convenience to create parent directories of a file path.
+     *
+     * Creates all the parent directories until the last
+     * component of @p filePath . @see createTargetDirs()
+     */
+    DLLEXPORT bool createTargetParentDirs( const QString& filePath ) const;
+
     /**
      * @brief getTotalMemoryB returns the total main memory, in bytes.
      *