def verify_blob(self, sum):
recipe = self.get_recipe(sum)
if recipe:
reader = create_blob_reader(recipe, self)
verified_ok = (sum == md5sum_file(reader))
elif self.has_raw_blob(sum):
path = self.get_blob_path(sum)
verified_ok = (sum == md5sum_file(path))
else:
raise ValueError("No such blob or recipe: " + sum)
return verified_ok
def get_blob(self, sum, offset = 0, size = -1):
""" Returns None if there is no such blob """
if self.has_raw_blob(sum):
path = self.get_blob_path(sum)
with open(path, "rb") as f:
f.seek(offset)
data = f.read(size)
return data
recipe = self.get_recipe(sum)
if recipe:
reader = create_blob_reader(recipe, self)
reader.seek(offset)
return reader.read(size)
else:
raise ValueError("No such blob or recipe exists: "+sum)
def verify_blob(self, sum):
recipe = self.get_recipe(sum)
md5_summer = hashlib.md5()
if recipe:
reader = create_blob_reader(recipe, self)
while reader.bytes_left():
md5_summer.update(reader.read(4096))
return sum == md5_summer.hexdigest()
if not self.has_raw_blob(sum):
raise ValueError("No such blob or recipe: " + sum)
path = self.get_blob_path(sum)
with safe_open(path, "rb") as f:
for block in file_reader(f):
md5_summer.update(block)
md5 = md5_summer.hexdigest()
verified_ok = (sum == md5)
return verified_ok
