1 # Copyright 2012 GRNET S.A. All rights reserved.
3 # Redistribution and use in source and binary forms, with or
4 # without modification, are permitted provided that the following
7 # 1. Redistributions of source code must retain the above
8 # copyright notice, this list of conditions and the following
11 # 2. Redistributions in binary form must reproduce the above
12 # copyright notice, this list of conditions and the following
13 # disclaimer in the documentation and/or other materials
14 # provided with the distribution.
16 # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
17 # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
20 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24 # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
26 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 # POSSIBILITY OF SUCH DAMAGE.
29 # The views and conclusions contained in the software and
30 # documentation are those of the authors and should not be
31 # interpreted as representing official policies, either expressed
32 # or implied, of GRNET S.A.
40 class FatalError(Exception):
41 """Fatal Error exception of snf-image-creator"""
45 def get_command(command):
46 """Return a file system binary command"""
47 def find_sbin_command(command, exception):
48 search_paths = ['/usr/local/sbin', '/usr/sbin', '/sbin']
49 for fullpath in map(lambda x: "%s/%s" % (x, command), search_paths):
50 if os.path.exists(fullpath) and os.access(fullpath, os.X_OK):
51 return sh.Command(fullpath)
55 return sh.__getattr__(command)
56 except sh.CommadNotFount as e:
57 return find_sbin_command(command, e)
60 def try_fail_repeat(command, *args):
61 """Execute a command multiple times until it succeeds"""
62 times = (0.1, 0.5, 1, 2)
68 except sh.ErrorReturnCode:
75 raise FatalError("Command: `%s %s' failed" % (command, " ".join(args)))
78 def free_space(dirname):
79 """Compute the free space in a directory"""
80 stat = os.statvfs(dirname)
81 return stat.f_bavail * stat.f_frsize
85 """Represents MD5 computations"""
86 def __init__(self, output):
87 """Create an MD5 instance"""
90 def compute(self, filename, size):
91 """Compute the MD5 checksum of a file"""
93 BLOCKSIZE = 4 * MB # 4MB
95 prog_size = ((size + MB - 1) // MB) # in MB
96 progressbar = self.out.Progress(prog_size, "Calculating md5sum", 'mb')
98 with open(filename, "r") as src:
101 length = min(left, BLOCKSIZE)
102 data = src.read(length)
105 progressbar.goto((size - left) // MB)
107 checksum = md5.hexdigest()
108 progressbar.success(checksum)
112 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :