freezer.utils.checksum module¶
-
class
freezer.utils.checksum.
CheckSum
(path, hasher_type='sha256', blocksize=1048576, exclude='', ignorelinks=False)¶ Bases:
object
Checksum a file or directory with sha256 or md5 algorithms.
This is used by backup and restore jobs to check for backup consistency.
- parameters::
- param path
the path to the file or directory to checksum
- type path
string
- param hasher_type
the hashing algorithm to use for checksum
- type hasher_type
string
- param hasher
hasher object for the specified hasher_type
- type hasher
hashlib object
- param blocksize
the max. size of block to read when hashing a file
- type blocksize
integer
- param exclude
pattern of files to exclude
- type exclude
string
- param checksum
final result for checksum computing
- type checksum
string
- param real_checksum
checksum without filename appended if unique file
- type real_checksum
string
- param count
number of files checksummed
- type count
int
-
compare
(checksum)¶ Compute the checksum for the object path and compare with the given checksum. :return: boolean
-
compute
()¶ Compute the checksum for the given path. If a single file is provided, the result is its checksum concatenated with its name. If a directory is provided, the result is the checksum of the checksum concatenation for each file. :return: string
-
get_files_hashes_in_path
()¶ Walk the files in path computing the checksum for each one and updates the concatenation checksum for the final result
-
get_hash
(filepath)¶ Open filename and calculate its hash. Append the hash to the previous result and stores the checksum for this concatenation :param filepath: path to file :type filepath: string :return: string containing the hash of the given file
-
hashes
= []¶
-
hashfile
(afile)¶ Checksum a single file with the chosen algorithm. The file is read in chunks of self.blocksize. :return: string
-
hashstring
(string)¶ - Returns
the hash for a given string
-
set_hasher
(hasher_type)¶ Sets the hasher from hashlib according to the chosen hasher_type. Also sets the size of the expected output