# interpreted as representing official policies, either expressed
# or implied, of GRNET S.A.
-import sys
-import pbs
+import sh
import hashlib
+import time
+import os
class FatalError(Exception):
+ """Fatal Error exception of snf-image-creator"""
pass
def get_command(command):
+ """Return a file system binary command"""
def find_sbin_command(command, exception):
search_paths = ['/usr/local/sbin', '/usr/sbin', '/sbin']
for fullpath in map(lambda x: "%s/%s" % (x, command), search_paths):
if os.path.exists(fullpath) and os.access(fullpath, os.X_OK):
- return pbs.Command(fullpath)
+ return sh.Command(fullpath)
raise exception
try:
- return pbs.__getattr__(command)
- except pbs.CommadNotFount as e:
+ return sh.__getattr__(command)
+ except sh.CommadNotFount as e:
return find_sbin_command(command, e)
+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')
+ progressbar = self.out.Progress(prog_size, "Calculating md5sum", 'mb')
md5 = hashlib.md5()
with open(filename, "r") as src:
left = size