File.Move throws IOException on macOS when rename differs only by case #21167
Description
If File.Move is used on macOS to rename a file that differs only by case, it fails:
class Program
{
static void Main(string[] args)
{
File.WriteAllText("foo.txt", "test");
File.Move("foo.txt", "Foo.txt"); //this throws
}
}This results in the following exception:
Unhandled Exception: System.IO.IOException: The file '/Users/Brandon/Code/repro2/Foo.txt' already exists.
at System.IO.UnixFileSystem.MoveFile(String sourceFullPath, String destFullPath)
at System.IO.File.Move(String sourceFileName, String destFileName)
at repro2.Program.Main(String[] args) in /Users/Brandon/Code/repro2/Program.cs:line 11
This same program does not throw when run on Windows or linux, and instead results in the renamed Foo.txt on disk.
I would expect this to behave consistently across all platforms. Using mv foo.txt Foo.txt on macOS renames the file correctly, so I would expect the same thing to be possible via File.Move.
dotnet --info
.NET Command Line Tools (1.0.1)
Product Information:
Version: 1.0.1
Commit SHA-1 hash: 005db40cd1
Runtime Environment:
OS Name: Mac OS X
OS Version: 10.12
OS Platform: Darwin
RID: osx.10.12-x64
Base Path: /usr/local/share/dotnet/sdk/1.0.1