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Adjusted the Windows LongPath support check for valid segment lengths
Closes #1512 (cherry picked from commit 52c6bc5549ab998ccc018d138c55f8f924eed6d3)
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Original file line number | Diff line number | Diff line change |
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@@ -1,15 +1,79 @@ | ||
using System; | ||
using System.IO; | ||
using NzbDrone.Common.EnvironmentInfo; | ||
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namespace NzbDrone.Common.Disk | ||
{ | ||
public static class LongPathSupport | ||
{ | ||
private static int MAX_PATH; | ||
private static int MAX_NAME; | ||
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public static void Enable() | ||
{ | ||
// Mono has an issue with enabling long path support via app.config. | ||
// This works for both mono and .net on Windows. | ||
AppContext.SetSwitch("Switch.System.IO.UseLegacyPathHandling", false); | ||
AppContext.SetSwitch("Switch.System.IO.BlockLongPaths", false); | ||
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DetectLongPathLimits(); | ||
} | ||
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private static void DetectLongPathLimits() | ||
{ | ||
if (!int.TryParse(Environment.GetEnvironmentVariable("MAX_PATH"), out MAX_PATH)) | ||
{ | ||
if (OsInfo.IsLinux) | ||
{ | ||
MAX_PATH = 4096; | ||
} | ||
else | ||
{ | ||
try | ||
{ | ||
// Windows paths can be up to 32,767 characters long, but each component of the path must be less than 255. | ||
// If the OS does not have Long Path enabled, then the following will throw an exception | ||
// ref: https://docs.microsoft.com/en-us/windows/win32/fileio/maximum-file-path-limitation | ||
Path.GetDirectoryName($@"C:\{new string('a', 254)}\{new string('a', 254)}"); | ||
MAX_PATH = 4096; | ||
} | ||
catch | ||
{ | ||
MAX_PATH = 260 - 1; | ||
} | ||
} | ||
} | ||
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if (!int.TryParse(Environment.GetEnvironmentVariable("MAX_NAME"), out MAX_NAME)) | ||
{ | ||
MAX_NAME = 255; | ||
} | ||
} | ||
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public static int MaxFilePathLength | ||
{ | ||
get | ||
{ | ||
if (MAX_PATH == 0) | ||
{ | ||
DetectLongPathLimits(); | ||
} | ||
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return MAX_PATH; | ||
} | ||
} | ||
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public static int MaxFileNameLength | ||
{ | ||
get | ||
{ | ||
if (MAX_NAME == 0) | ||
{ | ||
DetectLongPathLimits(); | ||
} | ||
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return MAX_NAME; | ||
} | ||
} | ||
} | ||
} |