[GR-13570] [GH-50] Provide inode IDs for files.

PullRequest: graalpython/385

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/PosixModuleBuiltins.java

@@ -503,9 +503,17 @@ Object stat(String path, boolean followSymlinks) {
             } catch (IOException e) {
                 size = 0;
             }
+            TruffleFile canonical;
+            try {
+                canonical = f.getCanonicalFile();
+            } catch (IOException | SecurityException e) {
+                // best effort
+                canonical = f.getAbsoluteFile();
+            }
+            int inode = getContext().getResources().getInodeId(canonical.getPath());
             return factory().createTuple(new Object[]{
                             mode,
-                            0, // ino
+                            inode, // ino
                             0, // dev
                             0, // nlink
                             uid,

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/PosixResources.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * The Universal Permissive License (UPL), Version 1.0
@@ -46,7 +46,9 @@
 import java.nio.channels.Pipe;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import com.oracle.truffle.api.TruffleFile;
@@ -65,6 +67,8 @@ public class PosixResources {
     private final List<Channel> files;
     private final List<String> filePaths;
     private final List<Process> children;
+    private final Map<String, Integer> inodes;
+    private int inodeCnt = 0;
 
     public PosixResources() {
         files = Collections.synchronizedList(new ArrayList<>());
@@ -82,6 +86,7 @@ public PosixResources() {
         files.add(null);
         files.add(null);
         files.add(null);
+        inodes = new HashMap<>();
     }
 
     @TruffleBoundary(allowInlining = true)
@@ -198,4 +203,18 @@ public int waitpid(int pid) throws ArrayIndexOutOfBoundsException, InterruptedEx
         children.set(pid, null);
         return exitStatus;
     }
+
+    @TruffleBoundary(allowInlining = true)
+    public int getInodeId(String canonical) {
+        synchronized (inodes) {
+            int inodeId;
+            if (!inodes.containsKey(canonical)) {
+                inodeId = inodeCnt++;
+                inodes.put(canonical, inodeId);
+            } else {
+                inodeId = inodes.get(canonical);
+            }
+            return inodeId;
+        }
+    }
 }