-def error(msg, new_line=True):
- nl = "\n" if new_line else ''
- sys.stderr.write(red('Error: %s' % msg) + nl)
-
-
-def warn(msg, new_line=True):
- if not silent:
- nl = "\n" if new_line else ''
- sys.stderr.write(yellow("Warning: %s" % msg) + nl)
-
-
-def success(msg, new_line=True):
- if not silent:
- nl = "\n" if new_line else ''
- sys.stdout.write(green(msg) + nl)
- if not nl:
- sys.stdout.flush()
-
-
-def output(msg="", new_line=True):
- if not silent:
- nl = "\n" if new_line else ''
- sys.stdout.write(msg + nl)
- if not nl:
- sys.stdout.flush()
-
-
-def progress(message='', bar_type="default"):
-
- MESSAGE_LENGTH = 30
-
- suffix = {
- 'default': '%(index)d/%(max)d',
- 'percent': '%(percent)d%%',
- 'b': '%(index)d/%(max)d B',
- 'kb': '%(index)d/%(max)d KB',
- 'mb': '%(index)d/%(max)d MB'
- }
-
- bar = Bar()
- bar.message = message.ljust(MESSAGE_LENGTH)
- bar.fill = '#'
- bar.suffix = suffix[bar_type]
- bar.bar_prefix = ' ['
- bar.bar_suffix = '] '
-
- return bar
-
-
-def md5(filename, size):
-
- BLOCKSIZE = 2 ** 22 # 4MB
-
- progressbar = progress("Calculating md5sum:", 'mb')
- progressbar.max = (size // (2 ** 20))
- md5 = hashlib.md5()
- with open(filename, "r") as src:
- left = size
- while left > 0:
- length = min(left, BLOCKSIZE)
- data = src.read(length)
- md5.update(data)
- left -= length
- progressbar.goto((size - left) // (2 ** 20))
-
- checksum = md5.hexdigest()
- output("\rCalculating md5sum...\033[K", False)
- success(checksum)
-
- return checksum
+def try_fail_repeat(command, *args):
+ """Execute a command multiple times until it succeeds"""
+ times = (0.1, 0.5, 1, 2)
+ i = iter(times)
+ while True:
+ try:
+ command(*args)
+ return
+ except sh.ErrorReturnCode:
+ try:
+ wait = i.next()
+ except StopIteration:
+ break
+ time.sleep(wait)
+
+ raise FatalError("Command: `%s %s' failed" % (command, " ".join(args)))
+
+
+def free_space(dirname):
+ """Compute the free space in a directory"""
+ stat = os.statvfs(dirname)
+ return stat.f_bavail * stat.f_frsize
+
+
+class MD5:
+ """Represents MD5 computations"""
+ def __init__(self, output):
+ """Create an MD5 instance"""
+ self.out = output
+
+ def compute(self, filename, size):
+ """Compute the MD5 checksum of a file"""
+ MB = 2 ** 20
+ BLOCKSIZE = 4 * MB # 4MB
+
+ prog_size = ((size + MB - 1) // MB) # in MB
+ progressbar = self.out.Progress(prog_size, "Calculating md5sum", 'mb')
+ md5 = hashlib.md5()
+ with open(filename, "r") as src:
+ left = size
+ while left > 0:
+ length = min(left, BLOCKSIZE)
+ data = src.read(length)
+ md5.update(data)
+ left -= length
+ progressbar.goto((size - left) // MB)
+
+ checksum = md5.hexdigest()
+ progressbar.success(checksum)
+
+ return checksum