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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 CENTOS

browser::open

Browser::Open(3)					User Contributed Perl Documentation					  Browser::Open(3)

NAME

       Browser::Open - open a browser in a given URL

VERSION

       version 0.03

SYNOPSIS

	   use Browser::Open qw( open_browser );

	   ### Try commands specific to the current Operating System
	   my $ok = open_browser($url);
	   # ! defined($ok): no recognized command found
	   # $ok == 0: command found and executed
	   # $ok != 0: command found, error while executing

	   ### Try all known commands
	   my $ok = open_browser($url, 1);

DESCRIPTION

       The functions optionaly exported by this module allows you to open URLs in the user browser.

       A set of known commands per OS-name is tested for presence, and the first one found is executed. With an optional parameter, all known
       commands are checked.

       The "open_browser" uses the "system()" function to execute the command. If you want more control, you can get the command with the
       "open_browser_cmd" or "open_browser_cmd_all" functions and then use whatever method you want to execute it.

API

       All functions are not exported by default. You must ask for them explicitly.

   open_browser
	   my $ok = open_browser($url, $all);

       Find an appropriate command and executes it with your $url. If $all is false, the default, only commands that match the current OS will be
       tested. If true, all known commands will be tested.

       If no command was found, returns "undef".

       If a command is found, returns the exit code of the execution attempt, 0 for success. See the "system()" for more information about this
       exit code.

       If no $url is given, an exception will be thrown: "Missing required parameter $url".

   open_browser_cmd
	   my $cmd = open_browser_cmd();

       Returns the best command found to open a URL on your system.

       If no command was found, returns "undef".

   open_browser_cmd_all
	   my $cmd = open_browser_cmd_all();

       Returns the first command found to open a URL.

       If no command was found, returns "undef".

AUTHOR

       Pedro Melo, "<melo at cpan.org>"

COPYRIGHT &; LICENSE
       Copyright 2009 Pedro Melo.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2012-03-09							  Browser::Open(3)
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