Fix handling of dangling symlink

There may be broken symlinks within the log directories, those fail with
an error when os.stat() is executed on them. So if/else is replaced with
try/except while TypeError used to catch when self.full_path is None

Change-Id: Iffee97760a39fa4f7760bd67fb63c5f0905064bd

roles/upload-logs-swift/library/test_zuul_swift_upload.py

@@ -20,10 +20,12 @@ __metaclass__ = type
 
 import os
 import testtools
+import time
+import stat
 import fixtures
 
 from bs4 import BeautifulSoup
-from .zuul_swift_upload import FileList, Indexer
+from .zuul_swift_upload import FileList, Indexer, FileDetail
 
 
 FIXTURE_DIR = os.path.join(os.path.dirname(__file__),
@@ -357,3 +359,24 @@ class TestFileList(testtools.TestCase):
 
             self.assertEqual(rows[0].find('a').get('href'), 'subdir.txt')
             self.assertEqual(rows[0].find('a').text, 'subdir.txt')
+
+
+class TestFileDetail(testtools.TestCase):
+
+    def test_get_file_detail(self):
+        '''Test files info'''
+        path = os.path.join(FIXTURE_DIR, 'logs/job-output.json')
+        file_detail = FileDetail(path, '')
+        path_stat = os.stat(path)
+        self.assertEqual(
+            time.gmtime(path_stat[stat.ST_MTIME]),
+            file_detail.last_modified)
+        self.assertEqual(16, file_detail.size)
+
+    def test_get_file_detail_missing_file(self):
+        '''Test files that go missing during a walk'''
+
+        file_detail = FileDetail('missing/file/that/we/cant/find', '')
+
+        self.assertEqual(time.gmtime(0), file_detail.last_modified)
+        self.assertEqual(0, file_detail.size)

roles/upload-logs-swift/library/zuul_swift_upload.py

@@ -177,6 +177,12 @@ class FileDetail():
                                  used for links.
             filename (str): An optional alternate filename in links.
         """
+        # Make FileNotFoundError exception to be compatible with python2
+        try:
+            FileNotFoundError  # noqa: F823
+        except NameError:
+            FileNotFoundError = OSError
+
         self.full_path = full_path
         if filename is None:
             self.filename = os.path.basename(full_path)
@@ -193,11 +199,11 @@ class FileDetail():
             self.mimetype = 'application/directory'
             self.encoding = None
             self.folder = True
-        if self.full_path:
+        try:
             st = os.stat(self.full_path)
             self.last_modified = time.gmtime(st[stat.ST_MTIME])
             self.size = st[stat.ST_SIZE]
-        else:
+        except (FileNotFoundError, TypeError):
             self.last_modified = time.gmtime(0)
             self.size = 0