root / image_creator / util.py @ 3b7d3fc7
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1 | ae48a082 | Nikos Skalkotos | # Copyright 2012 GRNET S.A. All rights reserved.
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2 | ae48a082 | Nikos Skalkotos | #
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3 | ae48a082 | Nikos Skalkotos | # Redistribution and use in source and binary forms, with or
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4 | ae48a082 | Nikos Skalkotos | # without modification, are permitted provided that the following
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5 | ae48a082 | Nikos Skalkotos | # conditions are met:
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6 | ae48a082 | Nikos Skalkotos | #
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7 | ae48a082 | Nikos Skalkotos | # 1. Redistributions of source code must retain the above
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8 | ae48a082 | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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9 | ae48a082 | Nikos Skalkotos | # disclaimer.
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10 | ae48a082 | Nikos Skalkotos | #
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11 | ae48a082 | Nikos Skalkotos | # 2. Redistributions in binary form must reproduce the above
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12 | ae48a082 | Nikos Skalkotos | # copyright notice, this list of conditions and the following
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13 | ae48a082 | Nikos Skalkotos | # disclaimer in the documentation and/or other materials
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14 | ae48a082 | Nikos Skalkotos | # provided with the distribution.
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15 | ae48a082 | Nikos Skalkotos | #
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16 | ae48a082 | Nikos Skalkotos | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | ae48a082 | Nikos Skalkotos | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | ae48a082 | Nikos Skalkotos | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | ae48a082 | Nikos Skalkotos | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | ae48a082 | Nikos Skalkotos | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | ae48a082 | Nikos Skalkotos | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | ae48a082 | Nikos Skalkotos | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | ae48a082 | Nikos Skalkotos | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | ae48a082 | Nikos Skalkotos | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | ae48a082 | Nikos Skalkotos | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | ae48a082 | Nikos Skalkotos | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | ae48a082 | Nikos Skalkotos | # POSSIBILITY OF SUCH DAMAGE.
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28 | ae48a082 | Nikos Skalkotos | #
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29 | ae48a082 | Nikos Skalkotos | # The views and conclusions contained in the software and
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30 | ae48a082 | Nikos Skalkotos | # documentation are those of the authors and should not be
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31 | ae48a082 | Nikos Skalkotos | # interpreted as representing official policies, either expressed
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32 | ae48a082 | Nikos Skalkotos | # or implied, of GRNET S.A.
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33 | 3ccb2618 | Nikos Skalkotos | |
34 | 979096dd | Nikos Skalkotos | import sys |
35 | 3ccb2618 | Nikos Skalkotos | import pbs |
36 | 8e3065a0 | Nikos Skalkotos | import hashlib |
37 | 979096dd | Nikos Skalkotos | |
38 | f165adc0 | Nikos Skalkotos | |
39 | f165adc0 | Nikos Skalkotos | class FatalError(Exception): |
40 | f165adc0 | Nikos Skalkotos | pass
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41 | f165adc0 | Nikos Skalkotos | |
42 | f165adc0 | Nikos Skalkotos | |
43 | 3ccb2618 | Nikos Skalkotos | def get_command(command): |
44 | 3ccb2618 | Nikos Skalkotos | def find_sbin_command(command, exception): |
45 | 3ccb2618 | Nikos Skalkotos | search_paths = ['/usr/local/sbin', '/usr/sbin', '/sbin'] |
46 | 3ccb2618 | Nikos Skalkotos | for fullpath in map(lambda x: "%s/%s" % (x, command), search_paths): |
47 | 3ccb2618 | Nikos Skalkotos | if os.path.exists(fullpath) and os.access(fullpath, os.X_OK): |
48 | 3ccb2618 | Nikos Skalkotos | return pbs.Command(fullpath)
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49 | 3ccb2618 | Nikos Skalkotos | raise exception
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50 | 3ccb2618 | Nikos Skalkotos | |
51 | 3ccb2618 | Nikos Skalkotos | try:
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52 | 3ccb2618 | Nikos Skalkotos | return pbs.__getattr__(command)
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53 | 3ccb2618 | Nikos Skalkotos | except pbs.CommadNotFount as e: |
54 | 3ccb2618 | Nikos Skalkotos | return find_sbin_command(command, e)
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55 | 22a6d232 | Nikos Skalkotos | |
56 | 22a6d232 | Nikos Skalkotos | |
57 | e77e66a9 | Nikos Skalkotos | class MD5: |
58 | e77e66a9 | Nikos Skalkotos | def __init__(self, output): |
59 | e77e66a9 | Nikos Skalkotos | self.out = output
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60 | 8e3065a0 | Nikos Skalkotos | |
61 | e77e66a9 | Nikos Skalkotos | def compute(self, filename, size): |
62 | 8e3065a0 | Nikos Skalkotos | |
63 | 96171db1 | Nikos Skalkotos | MB = 2 ** 20 |
64 | 96171db1 | Nikos Skalkotos | BLOCKSIZE = 4 * MB # 4MB |
65 | 8e3065a0 | Nikos Skalkotos | |
66 | 96171db1 | Nikos Skalkotos | prog_size = ((size + MB - 1) // MB) # in MB |
67 | 4e58b51b | Nikos Skalkotos | progressbar = self.out.Progress(prog_size, "Calculating md5sum", 'mb') |
68 | e77e66a9 | Nikos Skalkotos | md5 = hashlib.md5() |
69 | e77e66a9 | Nikos Skalkotos | with open(filename, "r") as src: |
70 | e77e66a9 | Nikos Skalkotos | left = size |
71 | e77e66a9 | Nikos Skalkotos | while left > 0: |
72 | e77e66a9 | Nikos Skalkotos | length = min(left, BLOCKSIZE)
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73 | e77e66a9 | Nikos Skalkotos | data = src.read(length) |
74 | e77e66a9 | Nikos Skalkotos | md5.update(data) |
75 | e77e66a9 | Nikos Skalkotos | left -= length |
76 | 96171db1 | Nikos Skalkotos | progressbar.goto((size - left) // MB) |
77 | 42ace959 | Nikos Skalkotos | |
78 | e77e66a9 | Nikos Skalkotos | checksum = md5.hexdigest() |
79 | e77e66a9 | Nikos Skalkotos | progressbar.success(checksum) |
80 | 8e3065a0 | Nikos Skalkotos | |
81 | e77e66a9 | Nikos Skalkotos | return checksum
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82 | 22a6d232 | Nikos Skalkotos | |
83 | 22a6d232 | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |