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