Add support for GUID Partition Tables

[snf-image-creator] / image_creator / util.py

diff --git a/image_creator/util.py b/image_creator/util.py
index bb57b5f..d3d4cc0 100644 (file)
--- a/image_creator/util.py
+++ b/image_creator/util.py
@@ -31,8 +31,18 @@
 # interpreted as representing official policies, either expressed
 # or implied, of GRNET S.A.
 
+import sys
 import pbs
-from clint.textui import puts, puts_err, colored, progress
+import hashlib
+from colors import red, green, yellow
+from progress.bar import Bar
+
+
+class FatalError(Exception):
+    pass
+
+
+silent = False
 
 
 def get_command(command):
@@ -49,25 +59,75 @@ def get_command(command):
         return find_sbin_command(command, e)
 
 
-def error(msg):
-    puts_err(colored.red("Error: %s\n" % msg))
+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 warn(msg):
-    puts_err(colored.yellow("Warning: %s" % msg))
 
+def md5(filename, size):
 
-def success(msg):
-    puts(colored.green(msg))
+    BLOCKSIZE = 2 ** 22  # 4MB
 
+    progressbar = progress("Calculating md5sum:", 'mb')
+    progressbar.max = ((size + 2 ** 20 - 1) // (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))
 
-def progress_generator(label='', n=100):
-    position = 0
-    for i in progress.bar(range(n), label):
-        if i < position:
-            continue
-        position = yield
-    yield  # suppress the StopIteration exception
+    checksum = md5.hexdigest()
+    output("\rCalculating md5sum...\033[K", False)
+    success(checksum)
 
+    return checksum
 
 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :