root / image_creator / util.py @ 331aa0ec
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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 | 42ace959 | Nikos Skalkotos | from colors import red, green, yellow |
38 | b1395967 | Nikos Skalkotos | from progress.bar import Bar |
39 | 979096dd | Nikos Skalkotos | |
40 | f165adc0 | Nikos Skalkotos | |
41 | f165adc0 | Nikos Skalkotos | class FatalError(Exception): |
42 | f165adc0 | Nikos Skalkotos | pass
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43 | f165adc0 | Nikos Skalkotos | |
44 | f165adc0 | Nikos Skalkotos | |
45 | 979096dd | Nikos Skalkotos | silent = False
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46 | 3ccb2618 | Nikos Skalkotos | |
47 | ae48a082 | Nikos Skalkotos | |
48 | 3ccb2618 | Nikos Skalkotos | def get_command(command): |
49 | 3ccb2618 | Nikos Skalkotos | def find_sbin_command(command, exception): |
50 | 3ccb2618 | Nikos Skalkotos | search_paths = ['/usr/local/sbin', '/usr/sbin', '/sbin'] |
51 | 3ccb2618 | Nikos Skalkotos | for fullpath in map(lambda x: "%s/%s" % (x, command), search_paths): |
52 | 3ccb2618 | Nikos Skalkotos | if os.path.exists(fullpath) and os.access(fullpath, os.X_OK): |
53 | 3ccb2618 | Nikos Skalkotos | return pbs.Command(fullpath)
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54 | 3ccb2618 | Nikos Skalkotos | raise exception
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55 | 3ccb2618 | Nikos Skalkotos | |
56 | 3ccb2618 | Nikos Skalkotos | try:
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57 | 3ccb2618 | Nikos Skalkotos | return pbs.__getattr__(command)
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58 | 3ccb2618 | Nikos Skalkotos | except pbs.CommadNotFount as e: |
59 | 3ccb2618 | Nikos Skalkotos | return find_sbin_command(command, e)
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60 | 22a6d232 | Nikos Skalkotos | |
61 | 22a6d232 | Nikos Skalkotos | |
62 | e2cf65d3 | Nikos Skalkotos | def error(msg, new_line=True): |
63 | 979096dd | Nikos Skalkotos | nl = "\n" if new_line else '' |
64 | 42ace959 | Nikos Skalkotos | sys.stderr.write(red('Error: %s' % msg) + nl)
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65 | 22a6d232 | Nikos Skalkotos | |
66 | 22a6d232 | Nikos Skalkotos | |
67 | e2cf65d3 | Nikos Skalkotos | def warn(msg, new_line=True): |
68 | 979096dd | Nikos Skalkotos | if not silent: |
69 | 979096dd | Nikos Skalkotos | nl = "\n" if new_line else '' |
70 | 42ace959 | Nikos Skalkotos | sys.stderr.write(yellow("Warning: %s" % msg) + nl)
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71 | 22a6d232 | Nikos Skalkotos | |
72 | 22a6d232 | Nikos Skalkotos | |
73 | e2cf65d3 | Nikos Skalkotos | def success(msg, new_line=True): |
74 | 979096dd | Nikos Skalkotos | if not silent: |
75 | 979096dd | Nikos Skalkotos | nl = "\n" if new_line else '' |
76 | 42ace959 | Nikos Skalkotos | sys.stdout.write(green(msg) + nl) |
77 | 979096dd | Nikos Skalkotos | if not nl: |
78 | 979096dd | Nikos Skalkotos | sys.stdout.flush() |
79 | 979096dd | Nikos Skalkotos | |
80 | 979096dd | Nikos Skalkotos | |
81 | 979096dd | Nikos Skalkotos | def output(msg="", new_line=True): |
82 | 979096dd | Nikos Skalkotos | if not silent: |
83 | 979096dd | Nikos Skalkotos | nl = "\n" if new_line else '' |
84 | 979096dd | Nikos Skalkotos | sys.stdout.write(msg + nl) |
85 | 979096dd | Nikos Skalkotos | if not nl: |
86 | 979096dd | Nikos Skalkotos | sys.stdout.flush() |
87 | 979096dd | Nikos Skalkotos | |
88 | 979096dd | Nikos Skalkotos | |
89 | b1395967 | Nikos Skalkotos | def progress(message='', bar_type="default"): |
90 | 22a6d232 | Nikos Skalkotos | |
91 | b1395967 | Nikos Skalkotos | MESSAGE_LENGTH = 30
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92 | 22a6d232 | Nikos Skalkotos | |
93 | 42ace959 | Nikos Skalkotos | suffix = { |
94 | 42ace959 | Nikos Skalkotos | 'default': '%(index)d/%(max)d', |
95 | 42ace959 | Nikos Skalkotos | 'percent': '%(percent)d%%', |
96 | 42ace959 | Nikos Skalkotos | 'b': '%(index)d/%(max)d B', |
97 | 42ace959 | Nikos Skalkotos | 'kb': '%(index)d/%(max)d KB', |
98 | 42ace959 | Nikos Skalkotos | 'mb': '%(index)d/%(max)d MB' |
99 | 42ace959 | Nikos Skalkotos | } |
100 | 42ace959 | Nikos Skalkotos | |
101 | 42ace959 | Nikos Skalkotos | bar = Bar() |
102 | 42ace959 | Nikos Skalkotos | bar.message = message.ljust(MESSAGE_LENGTH) |
103 | 42ace959 | Nikos Skalkotos | bar.fill = '#'
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104 | 42ace959 | Nikos Skalkotos | bar.suffix = suffix[bar_type] |
105 | 42ace959 | Nikos Skalkotos | bar.bar_prefix = ' ['
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106 | 42ace959 | Nikos Skalkotos | bar.bar_suffix = '] '
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107 | 42ace959 | Nikos Skalkotos | |
108 | 42ace959 | Nikos Skalkotos | return bar
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109 | 42ace959 | Nikos Skalkotos | |
110 | 8e3065a0 | Nikos Skalkotos | |
111 | b1395967 | Nikos Skalkotos | def md5(filename, size): |
112 | 8e3065a0 | Nikos Skalkotos | |
113 | b1395967 | Nikos Skalkotos | BLOCKSIZE = 2 ** 22 # 4MB |
114 | 8e3065a0 | Nikos Skalkotos | |
115 | b1395967 | Nikos Skalkotos | progressbar = progress("Calculating md5sum:", 'mb') |
116 | 331aa0ec | Nikos Skalkotos | progressbar.max = ((size + 2 ** 20 - 1) // (2 ** 20)) |
117 | 8e3065a0 | Nikos Skalkotos | md5 = hashlib.md5() |
118 | 8e3065a0 | Nikos Skalkotos | with open(filename, "r") as src: |
119 | 8e3065a0 | Nikos Skalkotos | left = size |
120 | 8e3065a0 | Nikos Skalkotos | while left > 0: |
121 | 8e3065a0 | Nikos Skalkotos | length = min(left, BLOCKSIZE)
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122 | 8e3065a0 | Nikos Skalkotos | data = src.read(length) |
123 | 8e3065a0 | Nikos Skalkotos | md5.update(data) |
124 | 8e3065a0 | Nikos Skalkotos | left -= length |
125 | b1395967 | Nikos Skalkotos | progressbar.goto((size - left) // (2 ** 20)) |
126 | 42ace959 | Nikos Skalkotos | |
127 | b1395967 | Nikos Skalkotos | checksum = md5.hexdigest() |
128 | b1395967 | Nikos Skalkotos | output("\rCalculating md5sum...\033[K", False) |
129 | b1395967 | Nikos Skalkotos | success(checksum) |
130 | 8e3065a0 | Nikos Skalkotos | |
131 | b1395967 | Nikos Skalkotos | return checksum
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132 | 22a6d232 | Nikos Skalkotos | |
133 | 22a6d232 | Nikos Skalkotos | # vim: set sta sts=4 shiftwidth=4 sw=4 et ai : |