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Temp fix for squashed images

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This commit is contained in:
Joseph Schorr 2015-08-25 14:18:20 -04:00
parent b87427aefb
commit df4ab8565c
1 changed files with 7 additions and 2 deletions
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9
formats/squashed.py
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@ -19,6 +19,10 @@ class SquashedDockerImage(TarImageFormatter):
command.
"""
# TODO(jschorr): Change this multiplier to reflect the 99%-tile of the actual difference between
# the uncompressed image size and the Size reported by Docker.
SIZE_MULTIPLIER = 2
def stream_generator(self, namespace, repository, tag, synthetic_image_id,
layer_json, get_image_iterator, get_layer_iterator, get_image_json):
@ -60,7 +64,7 @@ class SquashedDockerImage(TarImageFormatter):
estimated_file_size += image.storage.uncompressed_size
else:
image_json = get_image_json(image)
estimated_file_size += image_json.get('Size', 0)
estimated_file_size += image_json.get('Size', 0) * SquashedDockerImage.SIZE_MULTIPLIER
yield self.tar_file_header(synthetic_image_id + '/layer.tar', estimated_file_size)
@ -73,7 +77,8 @@ class SquashedDockerImage(TarImageFormatter):
# If the yielded size is more than the estimated size (which is unlikely but possible), then
# raise an exception since the tar header will be wrong.
if yielded_size > estimated_file_size:
raise FileEstimationException()
message = "Expected %s bytes, found %s bytes" % (estimated_file_size, yielded_size)
raise FileEstimationException(message)
# If the yielded size is less than the estimated size (which is likely), fill the rest with
# zeros.