Fixed Ospath incorrectly detecting arbitrary colon as windows path.

src/NzbDrone.Common.Test/OsPathFixture.cs

@@ -24,6 +24,7 @@ namespace NzbDrone.Common.Test
         [TestCase("/rooted/linux/path", OsPathKind.Unix)]
         [TestCase("/", OsPathKind.Unix)]
         [TestCase("linux/path", OsPathKind.Unix)]
+        [TestCase(@"Castle:unrooted+linux+path", OsPathKind.Unknown)]
         public void should_auto_detect_kind(string path, OsPathKind kind)
         {
             var result = new OsPath(path);
@@ -94,6 +95,8 @@ namespace NzbDrone.Common.Test
         [TestCase(@"rooted\windows\path")]
         [TestCase(@"path")]
         [TestCase("linux/path")]
+        [TestCase(@"Castle:unrooted+linux+path")]
+        [TestCase(@"C:unrooted+linux+path")]
         public void should_detect_unrooted_ospaths(string path)
         {
             var osPath = new OsPath(path);

src/NzbDrone.Common/Disk/OsPath.cs

@@ -44,7 +44,7 @@ namespace NzbDrone.Common.Disk
             {
                 return OsPathKind.Unix;
             }
-            if (path.Contains(':') || path.Contains('\\'))
+            if (HasWindowsDriveLetter(path) || path.Contains('\\'))
             {
                 return OsPathKind.Windows;
             }
@@ -55,6 +55,15 @@ namespace NzbDrone.Common.Disk
             return OsPathKind.Unknown;
         }
 
+        private static bool HasWindowsDriveLetter(string path)
+        {
+            if (path.Length < 2)    return false;
+            if (!char.IsLetter(path[0]) || path[1] != ':') return false;
+            if (path.Length > 2 && path[2] != '\\' && path[2] != '/') return false;
+
+            return true;
+        }
+
         private static string FixSlashes(string path, OsPathKind kind)
         {
             switch (kind)
@@ -97,7 +106,7 @@ namespace NzbDrone.Common.Disk
             {
                 if (IsWindowsPath)
                 {
-                    return _path.StartsWith(@"\\") || _path.Contains(':');
+                    return _path.StartsWith(@"\\") || HasWindowsDriveLetter(_path);
                 }
                 if (IsUnixPath)
                 {