1 files changed, 154 insertions, 0 deletions
diff --git a/build/checksums.py b/build/checksums.py
new file mode 100755
index 0000000000..1a393b4a6d
--- /dev/null
+++ b/build/checksums.py
@@ -0,0 +1,154 @@
+#!/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()