[JENKINS-47324] - Reduce usage of File.mkdirs() in FilePath and IOUtils (#3173)

* Move an instance of renameTo() to Files.move()

* Replace an instance of File.toURI() with an instance of Path.toUri()

* Replace mkdirs() with Files.createDirectories()
Replace mkdir() with Files.createTempDirectory()

* Undo addition of createTempDirectory() as per review comments

* Return to use of FilePath#mkdirs(File) and instead modify it to use the new API.

* Undo addition of toPath() in a URI conversion as it brings no benefits.

* Replace new uses of toPath() with Util.fileToPath() to pre-handle runtime exceptions

* Remove * import.
move mkdirs() to using FilePath method instead of File method.

* Make IOUtils.mkdirs(File) use Java7 API calls

* Add back accidentally removed imports.

* Fixed use of wildcard import

* Use utility method fileToPath() to handle potential exception thrown

core/src/main/java/hudson/FilePath.java

@@ -79,6 +79,7 @@ import java.net.URL;
 import java.net.URLConnection;
 import java.nio.file.Files;
 import java.nio.file.InvalidPathException;
+import java.nio.file.LinkOption;
 import java.nio.file.StandardCopyOption;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -125,8 +126,10 @@ import org.kohsuke.stapler.Stapler;
 
 import static hudson.FilePath.TarCompression.GZIP;
 import static hudson.Util.deleteFile;
+import static hudson.Util.fileToPath;
 import static hudson.Util.fixEmpty;
 import static hudson.Util.isSymlink;
+
 import java.util.Collections;
         
 /**
@@ -1165,7 +1168,7 @@ public final class FilePath implements Serializable {
                 // following Ant <mkdir> task to avoid possible race condition.
                 Thread.sleep(10);
 
-                return f.mkdirs() || f.exists();
+                return mkdirs(f) || f.exists();
             }
         }))
             throw new IOException("Failed to mkdirs: "+remote);
@@ -1615,7 +1618,7 @@ public final class FilePath implements Serializable {
         if (Util.NATIVE_CHMOD_MODE) {
             PosixAPI.jnr().chmod(f.getAbsolutePath(), mask);
         } else {
-            Files.setPosixFilePermissions(Util.fileToPath(f), Util.modeToPermissions(mask));
+            Files.setPosixFilePermissions(fileToPath(f), Util.modeToPermissions(mask));
         }
     }
 
@@ -1962,7 +1965,7 @@ public final class FilePath implements Serializable {
         act(new SecureFileCallable<Void>() {
             private static final long serialVersionUID = 1L;
             public Void invoke(File f, VirtualChannel channel) throws IOException {
-            	reading(f).renameTo(creating(new File(target.remote)));
+                Files.move(fileToPath(reading(f)), fileToPath(creating(new File(target.remote))), LinkOption.NOFOLLOW_LINKS);
                 return null;
             }
         });
@@ -2024,8 +2027,8 @@ public final class FilePath implements Serializable {
                     File targetFile = new File(target.remote);
                     File targetDir = targetFile.getParentFile();
                     filterNonNull().mkdirs(targetDir);
-                    Files.createDirectories(Util.fileToPath(targetDir));
-                    Files.copy(Util.fileToPath(reading(f)), Util.fileToPath(writing(targetFile)), StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING);
+                    Files.createDirectories(fileToPath(targetDir));
+                    Files.copy(fileToPath(reading(f)), fileToPath(writing(targetFile)), StandardCopyOption.COPY_ATTRIBUTES, StandardCopyOption.REPLACE_EXISTING);
                     return null;
                 }
             });
@@ -2957,11 +2960,12 @@ public final class FilePath implements Serializable {
         return f;
     }
 
-    private boolean mkdirs(File dir) {
+    private boolean mkdirs(File dir) throws IOException {
         if (dir.exists())   return false;
 
         filterNonNull().mkdirs(dir);
-        return dir.mkdirs();
+        Files.createDirectories(fileToPath(dir));
+        return true;
     }
 
     private File mkdirsE(File dir) throws IOException {

core/src/main/java/hudson/util/IOUtils.java

@@ -13,6 +13,8 @@ import java.util.Collection;
 import java.util.List;
 import java.util.regex.Pattern;
 
+import static hudson.Util.fileToPath;
+
 /**
  * Adds more to commons-io.
  *
@@ -51,20 +53,11 @@ public class IOUtils {
      *      This method returns the 'dir' parameter so that the method call flows better.
      */
     public static File mkdirs(File dir) throws IOException {
-        if(dir.mkdirs() || dir.exists())
-            return dir;
-
-        // following Ant <mkdir> task to avoid possible race condition.
         try {
-            Thread.sleep(10);
-        } catch (InterruptedException e) {
-            // ignore
+            return Files.createDirectories(fileToPath(dir)).toFile();
+        } catch (UnsupportedOperationException e) {
+            throw new IOException(e);
         }
-
-        if (dir.mkdirs() || dir.exists())
-            return dir;
-
-        throw new IOException("Failed to create a directory at "+dir);
     }
 
     /**
@@ -134,7 +127,7 @@ public class IOUtils {
             if (Util.NATIVE_CHMOD_MODE) {
                 return PosixAPI.jnr().stat(f.getPath()).mode();
             } else {
-                return Util.permissionsToMode(Files.getPosixFilePermissions(Util.fileToPath(f)));
+                return Util.permissionsToMode(Files.getPosixFilePermissions(fileToPath(f)));
             }
         } catch (IOException cause) {
             PosixException e = new PosixException("Unable to get file permissions", null);