Fixes long file names. (#92)

Author: coollog

CHANGELOG.md

@@ -25,3 +25,4 @@ All notable changes to this project will be documented in this file.
 - Cannot use private base image ([#68](https://github.com/google/jib/pull/68))
 - Building applications with no resources ([#73](https://github.com/google/jib/pull/73))
 - Pushing to registries like Docker Hub and ACR ([#75](https://github.com/google/jib/issues/75))
+- Cannot build with files having long file names (> 100 chars) ([#91](https://github.com/google/jib/issues/91)) 

jib-core/src/main/java/com/google/cloud/tools/jib/tar/TarStreamBuilder.java

@@ -41,6 +41,9 @@ private static void writeEntriesAsTarArchive(
       List<TarArchiveEntry> entries, OutputStream tarByteStream) throws IOException {
     try (TarArchiveOutputStream tarArchiveOutputStream =
         new TarArchiveOutputStream(tarByteStream)) {
+      // Enables PAX extended headers to support long file names.
+      tarArchiveOutputStream.setLongFileMode(TarArchiveOutputStream.LONGFILE_POSIX);
+
       for (TarArchiveEntry entry : entries) {
         tarArchiveOutputStream.putArchiveEntry(entry);
         if (entry.isFile()) {

jib-core/src/test/java/com/google/cloud/tools/jib/tar/TarStreamBuilderTest.java

@@ -60,6 +60,10 @@ public void setUp() throws IOException, URISyntaxException {
         new TarArchiveEntry(fileA.toFile(), "some/path/to/resourceFileA"));
     testTarStreamBuilder.addEntry(new TarArchiveEntry(fileB.toFile(), "crepecake"));
     testTarStreamBuilder.addEntry(new TarArchiveEntry(directoryA.toFile(), "some/path/to"));
+    testTarStreamBuilder.addEntry(
+        new TarArchiveEntry(
+            fileA.toFile(),
+            "some/really/long/path/that/exceeds/100/characters/abcdefghijklmnopqrstuvwxyz0123456789012345678901234567890"));
   }
 
   @Test
@@ -119,6 +123,15 @@ private void verifyTarArchive(TarArchiveInputStream tarArchiveInputStream) throw
     TarArchiveEntry headerDirectoryA = tarArchiveInputStream.getNextTarEntry();
     Assert.assertEquals("some/path/to/", headerDirectoryA.getName());
 
+    // Verifies the long file was archived correctly.
+    TarArchiveEntry headerFileALong = tarArchiveInputStream.getNextTarEntry();
+    Assert.assertEquals(
+        "some/really/long/path/that/exceeds/100/characters/abcdefghijklmnopqrstuvwxyz0123456789012345678901234567890",
+        headerFileALong.getName());
+    String fileALongString =
+        CharStreams.toString(new InputStreamReader(tarArchiveInputStream, StandardCharsets.UTF_8));
+    Assert.assertEquals(expectedFileAString, fileALongString);
+
     Assert.assertNull(tarArchiveInputStream.getNextTarEntry());
   }
 }