Reinstall server-everything when its cached copy was pruned

If the install directory exists but lacks the server, e.g. after the OS
cleaned up the temporary directory, delete it and install again instead
of failing on every run.

Signed-off-by: Dariusz Jędrzejczyk <dariusz.jedrzejczyk@broadcom.com>

Author: chemicL

mcp-test/src/test/java/io/modelcontextprotocol/client/ServerParameterUtils.java

@@ -87,13 +87,18 @@ private static void install(Path tmpDir, Path installDir) {
 			run(npmCommand("install", "--prefix", staging.toString(), "--no-save", "--no-audit", "--no-fund",
 					"--loglevel=error", "@modelcontextprotocol/server-everything@" + SERVER_EVERYTHING_VERSION));
 			try {
-				Files.move(staging, installDir, StandardCopyOption.ATOMIC_MOVE);
+				moveIntoPlace(staging, installDir);
 			}
 			catch (IOException e) {
-				// Another build won the race and installed it first, which is fine as
-				// long as the result is usable.
-				if (!Files.isRegularFile(serverScriptIn(installDir))) {
-					throw new UncheckedIOException("Failed to install server-everything to " + installDir, e);
+				// The directory exists but lacks the server, e.g. after the OS pruned
+				// the temporary directory: replace it instead of failing on every run.
+				deleteRecursively(installDir);
+				try {
+					moveIntoPlace(staging, installDir);
+				}
+				catch (IOException retryFailure) {
+					throw new UncheckedIOException("Failed to install server-everything to " + installDir,
+							retryFailure);
 				}
 			}
 		}
@@ -102,6 +107,19 @@ private static void install(Path tmpDir, Path installDir) {
 		}
 	}
 
+	private static void moveIntoPlace(Path staging, Path installDir) throws IOException {
+		try {
+			Files.move(staging, installDir, StandardCopyOption.ATOMIC_MOVE);
+		}
+		catch (IOException e) {
+			// Another build won the race and installed it first, which is fine as long
+			// as the result is usable.
+			if (!Files.isRegularFile(serverScriptIn(installDir))) {
+				throw e;
+			}
+		}
+	}
+
 	private static void deleteRecursively(Path path) {
 		if (!Files.exists(path)) {
 			return;