Improve file handling on Windows (#3764)

Changes:
- replace `new FileInputStream` with `Files.newInputStream`
- replace `new FileOutputStream` with `Files.newOutputStream`

Motivation: 
#1939

https://bugs.openjdk.org/browse/JDK-6357433 (in a comment) says:
> For jdk7, the workaround is to **use new file system API**. So instead
of new FileInputStream(f) and new FileOutputStream(f), use
f.toPath().newInputStream() and f.toPath().newOutputStream()

So seems like new NIO API does use, FILE_SHARE_DELETE, which is needed
to delete files in unix-style.

Author: sake92

contrib/sonatypecentral/src/mill/contrib/sonatypecentral/SonatypeCentralPublisher.scala

@@ -10,7 +10,7 @@ import mill.api.Logger
 import mill.scalalib.publish.Artifact
 import mill.scalalib.publish.SonatypeHelpers.getArtifactMappings
 
-import java.io.FileOutputStream
+import java.nio.file.Files
 import java.util.jar.JarOutputStream
 import java.util.zip.ZipEntry
 
@@ -110,15 +110,15 @@ class SonatypeCentralPublisher(
       wd: os.Path
   )(func: JarOutputStream => Unit): java.io.File = {
     val zipFile =
-      (wd / s"$fileNameWithoutExtension.zip").toIO
-    val fileOutputStream = new FileOutputStream(zipFile)
+      (wd / s"$fileNameWithoutExtension.zip")
+    val fileOutputStream = Files.newOutputStream(zipFile.toNIO)
     val jarOutputStream = new JarOutputStream(fileOutputStream)
     try {
       func(jarOutputStream)
     } finally {
       jarOutputStream.close()
     }
-    zipFile
+    zipFile.toIO
   }
 
   private def zipFilesToJar(

main/api/src/mill/api/IO.scala

@@ -1,5 +1,7 @@
 package mill.api
 
+import java.nio.file.Files
+
 /**
  * Misc IO utilities, eventually probably should be pushed upstream into
  * ammonite-ops
@@ -29,7 +31,7 @@ object IO extends StreamSupport {
           if (!entry.isDirectory) {
             val entryDest = ctx.dest / dest / os.SubPath(entry.getName)
             os.makeDir.all(entryDest / os.up)
-            val fileOut = new java.io.FileOutputStream(entryDest.toString)
+            val fileOut = Files.newOutputStream(entryDest.toNIO)
             IO.stream(zipStream, fileOut)
             fileOut.close()
           }

main/api/src/mill/api/JarOps.scala

@@ -1,10 +1,10 @@
 package mill.api
 
-import mill.api.Loose.Agg
-
-import java.io.{BufferedOutputStream, FileOutputStream}
+import java.io.BufferedOutputStream
+import java.nio.file.Files
 import java.util.jar.{JarEntry, JarOutputStream, Manifest}
 import scala.collection.mutable
+import mill.api.Loose.Agg
 
 @experimental
 trait JarOps {
@@ -76,7 +76,7 @@ trait JarOps {
     val _ = seen.add(os.sub / "META-INF/MANIFEST.MF")
 
     val jarStream = new JarOutputStream(
-      new BufferedOutputStream(new FileOutputStream(jar.toIO)),
+      new BufferedOutputStream(Files.newOutputStream(jar.toNIO)),
       manifest
     )
 

main/client/src/mill/main/client/ServerLauncher.java

@@ -8,7 +8,6 @@
 import org.newsclub.net.unix.AFUNIXSocketAddress;
 
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.PrintStream;
@@ -126,7 +125,8 @@ int run(Path serverDir, boolean setJnaNoSys, Locks locks) throws Exception {
         ) {
             stdoutTailer.start();
             stderrTailer.start();
-            try (FileOutputStream f = new FileOutputStream(serverDir + "/" + ServerFiles.runArgs)) {
+            String serverPath = serverDir + "/" + ServerFiles.runArgs;
+            try (OutputStream f = Files.newOutputStream(Paths.get(serverPath))) {
                 f.write(System.console() != null ? 1 : 0);
                 Util.writeString(f, BuildInfo.millVersion);
                 Util.writeArgs(args, f);

main/client/test/src/mill/main/client/FileToStreamTailerTest.java

@@ -3,9 +3,8 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.File;
-import java.io.FileOutputStream;
 import java.io.PrintStream;
-
+import java.nio.file.Files;
 import org.junit.Ignore;
 import org.junit.Test;
 
@@ -49,7 +48,7 @@ public void handleNoExistingFileThatAppearsLater() throws Exception {
             assertEquals(bas.toString(), "");
 
             try (
-                    PrintStream out = new PrintStream(new FileOutputStream(file));
+                    PrintStream out = new PrintStream(Files.newOutputStream(file.toPath()));
             ) {
                 out.println("log line");
                 assertTrue(file.exists());
@@ -76,7 +75,7 @@ public void handleExistingInitiallyEmptyFile() throws Exception{
             assertEquals(bas.toString(), "");
 
             try (
-                PrintStream out = new PrintStream(new FileOutputStream(file));
+                PrintStream out = new PrintStream(Files.newOutputStream(file.toPath()));
             ) {
                 out.println("log line");
                 assertTrue(file.exists());
@@ -95,7 +94,7 @@ public void handleExistingFileWithOldContent() throws Exception{
         assertTrue(file.exists());
 
         try (
-            PrintStream out = new PrintStream(new FileOutputStream(file));
+            PrintStream out = new PrintStream(Files.newOutputStream(file.toPath()));
         ) {
             out.println("old line 1");
             out.println("old line 2");
@@ -130,7 +129,7 @@ public void handleExistingEmptyFileWhichDisappearsAndComesBack() throws Exceptio
             assertEquals(bas.toString(), "");
 
             try (
-                PrintStream out = new PrintStream(new FileOutputStream(file));
+                PrintStream out = new PrintStream(Files.newOutputStream(file.toPath()));
             ) {
                 out.println("log line 1");
                 out.println("log line 2");
@@ -146,7 +145,7 @@ public void handleExistingEmptyFileWhichDisappearsAndComesBack() throws Exceptio
             Thread.sleep(100);
 
             try (
-                PrintStream out = new PrintStream(new FileOutputStream(file));
+                PrintStream out = new PrintStream(Files.newOutputStream(file.toPath()));
             ) {
                 out.println("new line");
                 assertTrue(file.exists());

main/util/src/mill/util/Util.scala

@@ -1,5 +1,7 @@
 package mill.util
 
+import java.nio.file.Files
+import java.nio.file.Paths
 import coursier.Repository
 import mill.api.Loose.Agg
 import mill.api.{BuildInfo, Ctx, IO, PathRef, Result}
@@ -19,7 +21,7 @@ object Util {
   {
     val millOptionsPath = sys.props("MILL_OPTIONS_PATH")
     if (millOptionsPath != null)
-      LongMillProps.load(new java.io.FileInputStream(millOptionsPath))
+      LongMillProps.load(Files.newInputStream(Paths.get(millOptionsPath)))
   }
 
   def cleanupScaladoc(v: String): Array[String] = {
@@ -45,19 +47,13 @@ object Util {
       ctx: Ctx.Dest
   ): PathRef = {
     val out = ctx.dest / dest
-
     val website = new java.net.URI(url).toURL
-    val rbc = java.nio.channels.Channels.newChannel(website.openStream)
+    val websiteInputStream = website.openStream
     try {
-      val fos = new java.io.FileOutputStream(out.toIO)
-      try {
-        fos.getChannel.transferFrom(rbc, 0, java.lang.Long.MAX_VALUE)
-        PathRef(out)
-      } finally {
-        fos.close()
-      }
+      Files.copy(websiteInputStream, out.toNIO)
+      PathRef(out)
     } finally {
-      rbc.close()
+      websiteInputStream.close()
     }
   }
 

runner/client/src/mill/runner/client/MillProcessLauncher.java

@@ -3,7 +3,7 @@
 import static mill.main.client.OutFiles.*;
 
 import java.io.File;
-import java.io.FileInputStream;
+import java.io.InputStream;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -145,7 +145,7 @@ static String[] millClasspath() throws Exception {
 
             // read MILL_CLASSPATH from file MILL_OPTIONS_PATH
             Properties millProps = new Properties();
-            try (FileInputStream is = new FileInputStream(millOptionsPath)) {
+            try (InputStream is = Files.newInputStream(Paths.get(millOptionsPath))) {
                 millProps.load(is);
             } catch (IOException e) {
                 throw new RuntimeException("Could not load '" + millOptionsPath + "'", e);

runner/src/mill/runner/MillMain.scala

@@ -1,6 +1,8 @@
 package mill.runner
 
-import java.io.{FileOutputStream, PipedInputStream, PrintStream}
+import java.io.{PipedInputStream, PrintStream}
+import java.nio.file.Files
+import java.nio.file.StandardOpenOption
 import java.util.Locale
 import scala.jdk.CollectionConverters._
 import scala.util.Properties
@@ -45,7 +47,8 @@ object MillMain {
         // and all Mill output (stdout and stderr) goes to a dedicated file
         val stderrFile = WorkspaceRoot.workspaceRoot / ".bsp/mill-bsp.stderr"
         os.makeDir.all(stderrFile / os.up)
-        val errFile = new PrintStream(new FileOutputStream(stderrFile.toIO, true))
+        val errFile =
+          new PrintStream(Files.newOutputStream(stderrFile.toNIO, StandardOpenOption.APPEND))
         val errTee = new TeePrintStream(initialSystemStreams.err, errFile)
         val msg = s"Mill in BSP mode, version ${BuildInfo.millVersion}, ${new java.util.Date()}"
         errTee.println(msg)

testrunner/src/mill/testrunner/TestRunnerUtils.scala

@@ -4,7 +4,7 @@ import mill.api.{Ctx, Loose, TestReporter, internal}
 import os.Path
 import sbt.testing._
 
-import java.io.FileInputStream
+import java.nio.file.Files
 import java.lang.annotation.Annotation
 import java.lang.reflect.Modifier
 import java.util.concurrent.ConcurrentLinkedQueue
@@ -19,7 +19,7 @@ import scala.jdk.CollectionConverters.IteratorHasAsScala
     if (os.isDir(base)) {
       os.walk.stream(base).filter(_.ext == "class").map(_.relativeTo(base).toString)
     } else {
-      val zip = new ZipInputStream(new FileInputStream(base.toIO))
+      val zip = new ZipInputStream(Files.newInputStream(base.toNIO))
       geny.Generator.selfClosing(
         (
           Iterator.continually(zip.getNextEntry)