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Full Discussion: [Python] replicating "sha256 -C checksum_file.txt file.txt"
Top Forums Programming [Python] replicating "sha256 -C checksum_file.txt file.txt" Post 303038559 by da1 on Friday 6th of September 2019 05:02:07 AM
Old 09-06-2019
This is what I came up with so far, thank you for the hints:
Code:
workdir='/tmp'
iso_name='install65.iso'
sha_file='SHA256'

    file = open(workdir + '/' + sha_file, 'r')
    for lines in file:
        values = [x.strip('()') for x in lines.split()]
        #print(values)
        if iso_name == values[1]:
            print('file found')
            if computed_sum == values[-1]:
                print('hash OK')
                print(values[-1])
            else:
                print('hash NOT OK')
                print(values[-1])
                exit(1)
        else:
            print('file NOT found')
    file.close()


But I'm having a hard time understanding how I can search for one string (ex. iso name) and if found, use the same line and check for another string (hash sum).

The result of the code above is this;
Code:
38d1f8cadd502f1c27bf05c5abde6cc505dd28f3f34f8a941048ff9a54f9f608
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file found
hash OK
38d1f8cadd502f1c27bf05c5abde6cc505dd28f3f34f8a941048ff9a54f9f608
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found
file NOT found

--- Post updated at 12:02 PM ---

I spoke too soon.

I came up with this:
Code:
def check_sha256(block_size=65536):
#    fetch_sha256()
    sha256 = hashlib.sha256()
    with open(workdir + "/" + iso_name, 'rb') as f:
      for block in iter(lambda: f.read(block_size), b''):
        sha256.update(block)
    computed_sum = sha256.hexdigest()
    file = open(workdir + '/' + sha_file, 'r')
    for lines in file:
        values = [x.strip('()') for x in lines.split()]
        if iso_name in values[1]:
            if computed_sum in values[-1]:
                print('SHA256: OK')
                break
            else:
                print('SHA256: NOT OK. Exiting... ')
                exit(1)
    file.close()

It works fine from what I can see but any pointers on improvements would be welcomed!

Thank you very much!
 

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LEARN ABOUT DEBIAN

update-python-modules

UPDATE-PYTHON-MODULES(8)				      System Manager's Manual					  UPDATE-PYTHON-MODULES(8)

NAME

       update-python-modules - byte-compile python modules

SYNOPSIS

       update-python-modules [options] [package.public [...]]

DESCRIPTION

       The update-python-modules command is part of the python-support bundle.

       update-python-modules  is  responsible for the byte-compilation of python modules. When used in byte-compilation mode, it will byte-compile
       modules references in the files given on the command line. When used in	installation  mode,  it  will  byte-compile  them  once  for  each
       installed python version, and will make them available for all of them.

       At  each  invocation,  with  or without arguments, update-python-modules will check for installed python versions, and will build or remove
       modules according to new or removed versions since the last time it was run.

ARGUMENTS

       Arguments must be files or directories located in the /usr/share/python-support directory. Depending on their extension, they  are  treated
       differently.

       package.public
	      A file listing public modules to install for each version. These modules must lie in /usr/share/pyshared or /usr/lib/pyshared.

       package.private
	      A file listing private modules to byte-compile for one Python version.

       package/
	      A legacy directory hierarchy of public modules. The C extensions and portions that change with the Python version are to be found in
	      /usr/lib/python-support/pythonX.Y/package/.

       package.dirs
	      A legacy file listing directories where to find private modules.

OPTIONS

       -h, --help
	      Show summary of options.

       -v, --verbose
	      Detail all actions while they are performed.

       -b, --bytecompile
	      Only accept to work on private modules. When given this option, update-python-modules will fail if passed references to public  mod-
	      ules.

       -i, --install
	      Only  accept  to work on public modules. When given this option, update-python-modules will fail if passed references to public mod-
	      ules.

       -c, --clean
	      Clean modules instead of installing them.

       -a, --rebuild-all
	      Rebuild all private modules. This is necessary when the default python version was changed, for example.

       -f, --force-rebuild-all
	      Clean all modules (public and private), and rebuild them.

FILES

       /usr/lib/pymodules/pythonX.Y/
	      These directories contain the byte-compiled modules for version pythonX.Y.

SEE ALSO

       /usr/share/doc/python-support/README.gz

AUTHOR

       Josselin Mouette <joss@debian.org>.

								    18 Feb 2009 					  UPDATE-PYTHON-MODULES(8)
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