Retry cleanup commands if they fail

[snf-image-creator] / image_creator / disk.py

diff --git a/image_creator/disk.py b/image_creator/disk.py
index a8d5d66..bb90816 100644 (file)
--- a/image_creator/disk.py
+++ b/image_creator/disk.py
@@ -33,6 +33,7 @@
 
 from image_creator.util import get_command
 from image_creator.util import FatalError
+from image_creator.util import try_fail_repeat
 from image_creator.gpt import GPTPartitionTable
 from image_creator.bundle_volume import BundleVolume
 
@@ -43,7 +44,6 @@ import uuid
 import re
 import sys
 import guestfs
-import time
 from sendfile import sendfile
 
 
@@ -63,7 +63,8 @@ class Disk(object):
 
     def __init__(self, source, output):
         """Create a new Disk instance out of a source media. The source
-        media can be an image file, a block device or a directory."""
+        media can be an image file, a block device or a directory.
+        """
         self._cleanup_jobs = []
         self._devices = []
         self.source = source
@@ -76,14 +77,20 @@ class Disk(object):
     def _losetup(self, fname):
         loop = losetup('-f', '--show', fname)
         loop = loop.strip()  # remove the new-line char
-        self._add_cleanup(losetup, '-d', loop)
+        self._add_cleanup(try_fail_repeat, losetup, '-d', loop)
         return loop
 
     def _dir_to_disk(self):
         if self.source == '/':
             bundle = BundleVolume(self.out, self.meta)
-            image = bundle.create_image()
-            self._add_cleanup(os.unlink, image)
+            image = '/var/tmp/%s.diskdump' % uuid.uuid4().hex
+
+            def check_unlink(path):
+                if os.path.exists(path):
+                    os.unlink(path)
+
+            self._add_cleanup(check_unlink, image)
+            bundle.create_image(image)
             return self._losetup(image)
         raise FatalError("Using a directory as media source is supported")
 
@@ -138,11 +145,7 @@ class Disk(object):
             os.write(tablefd, "0 %d snapshot %s %s n 8" %
                               (int(size), sourcedev, cowdev))
             dmsetup('create', snapshot, table)
-            self._add_cleanup(dmsetup, 'remove', snapshot)
-            # Sometimes dmsetup remove fails with Device or resource busy,
-            # although everything is cleaned up and the snapshot is not
-            # used by anyone. Add a 2 seconds delay to be on the safe side.
-            self._add_cleanup(time.sleep, 2)
+            self._add_cleanup(try_fail_repeat, dmsetup, 'remove', snapshot)
 
         finally:
             os.unlink(table)
@@ -205,15 +208,18 @@ class DiskDevice(object):
 
     def enable(self):
         """Enable a newly created DiskDevice"""
-        self.progressbar = self.out.Progress(100, "Launching helper VM",
-                                             "percent")
-        eh = self.g.set_event_callback(self.progress_callback,
-                                       guestfs.EVENT_PROGRESS)
+
+        self.out.output('Launching helper VM (may take a while) ...', False)
+        # self.progressbar = self.out.Progress(100, "Launching helper VM",
+        #                                     "percent")
+        # eh = self.g.set_event_callback(self.progress_callback,
+        #                               guestfs.EVENT_PROGRESS)
         self.g.launch()
         self.guestfs_enabled = True
-        self.g.delete_event_callback(eh)
-        self.progressbar.success('done')
-        self.progressbar = None
+        # self.g.delete_event_callback(eh)
+        # self.progressbar.success('done')
+        # self.progressbar = None
+        self.out.success('done')
 
         self.out.output('Inspecting Operating System ...', False)
         roots = self.g.inspect_os()
@@ -244,11 +250,11 @@ class DiskDevice(object):
             # Close the guestfs handler if open
             self.g.close()
 
-    def progress_callback(self, ev, eh, buf, array):
-        position = array[2]
-        total = array[3]
-
-        self.progressbar.goto((position * 100) // total)
+#    def progress_callback(self, ev, eh, buf, array):
+#        position = array[2]
+#        total = array[3]
+#
+#        self.progressbar.goto((position * 100) // total)
 
     def mount(self, readonly=False):
         """Mount all disk partitions in a correct order."""