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-rwxr-xr-xbuild/checksums.py154
1 files changed, 154 insertions, 0 deletions
diff --git a/build/checksums.py b/build/checksums.py
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+++ b/build/checksums.py
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+#!/usr/bin/python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import hashlib
+import logging
+import os
+from optparse import OptionParser
+
+logger = logging.getLogger("checksums.py")
+
+
+def digest_file(filename, digest, chunk_size=131072):
+ """Produce a checksum for the file specified by 'filename'. 'filename'
+ is a string path to a file that is opened and read in this function. The
+ checksum algorithm is specified by 'digest' and is a valid OpenSSL
+ algorithm. If the digest used is not valid or Python's hashlib doesn't
+ work, the None object will be returned instead. The size of blocks
+ that this function will read from the file object it opens based on
+ 'filename' can be specified by 'chunk_size', which defaults to 1K"""
+ assert not os.path.isdir(filename), "this function only works with files"
+
+ logger.debug("Creating new %s object" % digest)
+ h = hashlib.new(digest)
+ with open(filename, "rb") as f:
+ while True:
+ data = f.read(chunk_size)
+ if not data:
+ logger.debug("Finished reading in file")
+ break
+ h.update(data)
+ hash = h.hexdigest()
+ logger.debug("Hash for %s is %s" % (filename, hash))
+ return hash
+
+
+def process_files(dirs, output_filename, digests):
+ """This function takes a list of directory names, 'drs'. It will then
+ compute the checksum for each of the files in these by by opening the files.
+ Once each file is read and its checksum is computed, this function
+ will write the information to the file specified by 'output_filename'.
+ The path written in the output file will have anything specified by 'strip'
+ removed from the path. The output file is closed before returning nothing
+ The algorithm to compute checksums with can be specified by 'digests'
+ and needs to be a list of valid OpenSSL algorithms.
+
+ The output file is written in the format:
+ <hash> <algorithm> <filesize> <filepath>
+ Example:
+ d1fa09a<snip>e4220 sha1 14250744 firefox-4.0b6pre.en-US.mac64.dmg
+ """
+
+ if os.path.exists(output_filename):
+ logger.debug('Overwriting existing checksums file "%s"' % output_filename)
+ else:
+ logger.debug('Creating a new checksums file "%s"' % output_filename)
+ with open(output_filename, "w+") as output:
+ for d in dirs:
+ for root, dirs, files in os.walk(d):
+ for f in files:
+ full = os.path.join(root, f)
+ rel = os.path.relpath(full, d)
+
+ for digest in digests:
+ hash = digest_file(full, digest)
+
+ output.write(
+ "%s %s %s %s\n" % (hash, digest, os.path.getsize(full), rel)
+ )
+
+
+def setup_logging(level=logging.DEBUG):
+ """This function sets up the logging module using a speficiable logging
+ module logging level. The default log level is DEBUG.
+
+ The output is in the format:
+ <level> - <message>
+ Example:
+ DEBUG - Finished reading in file"""
+
+ logger = logging.getLogger("checksums.py")
+ logger.setLevel(logging.DEBUG)
+ handler = logging.StreamHandler()
+ handler.setLevel(level)
+ formatter = logging.Formatter("%(levelname)s - %(message)s")
+ handler.setFormatter(formatter)
+ logger.addHandler(handler)
+
+
+def main():
+ """This is a main function that parses arguments, sets up logging
+ and generates a checksum file"""
+ # Parse command line arguments
+ parser = OptionParser()
+ parser.add_option(
+ "-d",
+ "--digest",
+ help="checksum algorithm to use",
+ action="append",
+ dest="digests",
+ )
+ parser.add_option(
+ "-o",
+ "--output",
+ help="output file to use",
+ action="store",
+ dest="outfile",
+ default="checksums",
+ )
+ parser.add_option(
+ "-v",
+ "--verbose",
+ help="Be noisy (takes precedence over quiet)",
+ action="store_true",
+ dest="verbose",
+ default=False,
+ )
+ parser.add_option(
+ "-q",
+ "--quiet",
+ help="Be quiet",
+ action="store_true",
+ dest="quiet",
+ default=False,
+ )
+
+ options, args = parser.parse_args()
+
+ # Figure out which logging level to use
+ if options.verbose:
+ loglevel = logging.DEBUG
+ elif options.quiet:
+ loglevel = logging.ERROR
+ else:
+ loglevel = logging.INFO
+
+ # Set up logging
+ setup_logging(loglevel)
+
+ # Validate the digest type to use
+ if not options.digests:
+ options.digests = ["sha1"]
+
+ for i in args:
+ if not os.path.isdir(i):
+ logger.error("%s is not a directory" % i)
+ exit(1)
+
+ process_files(args, options.outfile, options.digests)
+
+
+if __name__ == "__main__":
+ main()