Create temp files in a temp directory

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
 - Fixed TAR composition on Windows (#444)
 - Allowing `addExposedPort` to be used after ports have been specified with `withExposedPorts` (#453)
 - Stopping creation of temporary directory prior to creating temporary file (#443)
+- Fixed temp files should be created in a temp directory (#423)
 
 ### Changed
 - Added `forResponsePredicate` method to HttpWaitStrategy to test response body (#441)

core/src/main/java/org/testcontainers/utility/MountableFile.java

@@ -33,6 +33,9 @@
 @Slf4j
 public class MountableFile implements Transferable {
 
+    private static final String TESTCONTAINERS_TMP_DIR_PREFIX = ".testcontainers-tmp-";
+    public static final String OS_MAC_TMP_DIR = "/tmp";
+
     private final String path;
 
     @Getter(lazy = true)
@@ -163,7 +166,7 @@ private String getResourcePath() {
      * @return the path of the temporary file/directory
      */
     private String extractClassPathResourceToTempLocation(final String hostPath) {
-        File tmpLocation = new File(".testcontainers-tmp-" + Base58.randomString(5));
+        File tmpLocation = createTempDirectory();
         //noinspection ResultOfMethodCallIgnored
         tmpLocation.delete();
 
@@ -194,6 +197,17 @@ private String extractClassPathResourceToTempLocation(final String hostPath) {
         return tmpLocation.getAbsolutePath();
     }
 
+    private File createTempDirectory() {
+        try {
+            if (SystemUtils.IS_OS_MAC) {
+                return Files.createTempDirectory(Paths.get(OS_MAC_TMP_DIR), TESTCONTAINERS_TMP_DIR_PREFIX).toFile();
+            }
+            return Files.createTempDirectory(TESTCONTAINERS_TMP_DIR_PREFIX).toFile();
+        } catch  (IOException e) {
+            return new File(TESTCONTAINERS_TMP_DIR_PREFIX + Base58.randomString(5));
+        }
+    }
+
     @SuppressWarnings("ResultOfMethodCallIgnored")
     private void copyFromJarToLocation(final JarFile jarFile,
                                        final JarEntry entry,
@@ -305,4 +319,4 @@ private int getUnixFileMode(final String pathAsString) {
             return mode;
         }
     }
-}
+}