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InMemoryDirectoryInfo prepends rootDir to files

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InMemoryDirectoryInfo now prepends the specified root directory to its collection of files.

InMemoryDirectoryInfo is used by MatcherExtensions.Match, which enables the Matcher to execute glob-matching patterns without accessing the disk.

Previous behavior

Previously, relative paths in the files argument of the constructor were prepended with the current working directory (CWD). This caused an unnecessary dependency on the CWD for a type that's supposed to work in-memory.

New behavior

Starting in .NET 9, relative paths in the files argument of the constructor are prepended with the specified root directory.

Version introduced

.NET 9 Preview 1

Type of breaking change

This change is a behavioral change.

Reason for change

There were blocked scenarios with in-memory paths using a drive letter other than the one used by the current working directory. For example, see dotnet/runtime issue 93107.

If you depended on the previous behavior, adjust your code to account for the files now being prepended with the root directory. For example:

// Since rootDir is also relative, it could've been used to filter the matching scope of `files`.
-string rootDir = "dir1";
// Now that's not possible; everything in `files` is under `root`.
+string rootDir = "root";
string[] files = ["dir1/test.0", "dir1/subdir/test.1", "dir2/test.2"];

-PatternMatchingResult result = new Matcher().AddInclude("**/*").Match(rootDir, files);
// Adjust the pattern if you want to scope down to dir1.
+PatternMatchingResult result = new Matcher().AddInclude("dir1/**/*").Match(rootDir, files);
Console.WriteLine(string.Join(", ", result.Files.Select(x => x.Path)));

// Output:
// dir1/test.0
// dir1/subdir/test.1

Affected APIs