Switch to use user.home for all temp directory and added prefix to avoid filling up /tmp.

Author: jshum2479

src/main/java/com/oracle/weblogicx/imagebuilder/cli/menu/CreateImage.java

@@ -68,7 +68,9 @@ public CommandResponse call() throws Exception {
 
             List<String> cmdBuilder = getInitialBuildCmd();
             // create a tmp directory for user.
-            tmpDir = Files.createTempDirectory(null);
+            // using user home as base to avoid running out of space in tmp
+            tmpDir = Files.createTempDirectory(Paths.get(System.getProperty("user.home")),
+                "wlsimgbuilder_temp");
             String tmpDirPath = tmpDir.toAbsolutePath().toString();
             logger.info("tmp directory used for build context: " + tmpDirPath);
             Path tmpPatchesDir = Files.createDirectory(Paths.get(tmpDirPath, "patches"));
@@ -80,7 +82,8 @@ public CommandResponse call() throws Exception {
             if (fromImage != null && !fromImage.isEmpty()) {
                 cmdBuilder.add(BUILD_ARG);
 
-                tmpDir2 = Files.createTempDirectory(Paths.get(System.getProperty("user.home")), null);
+                tmpDir2 = Files.createTempDirectory(Paths.get(System.getProperty("user.home")),
+                    "wlsimgbuilder_temp");
                 logger.info("tmp directory in user.home for docker run: " + tmpDir2);
 
                 Utils.copyResourceAsFile("/probe-env/test-create-env.sh",

src/main/java/com/oracle/weblogicx/imagebuilder/util/Utils.java

@@ -323,6 +323,10 @@ public static void deleteFilesRecursively(Path tmpDir) throws IOException {
                     .map(Path::toFile)
                     //.peek(System.out::println)
                     .forEach(File::delete);
+
+            if (Files.exists(tmpDir)) {
+                logger.warning("Directory not cleaned up, please remove it manually " + tmpDir.toString());
+            }
         }
     }