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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

python-mkdebian

PYTHON-MKDEBIAN(1)						   User Commands						PYTHON-MKDEBIAN(1)

NAME

       python-mkdebian - Generate a suitable Debian source package for a standard distutils application

SYNOPSIS

       python-mkdebian [options]

DESCRIPTION

       This  script generates a reasonably Debian Policy compliant Debian source package for a Python application that uses distutils properly. It
       assumes that there are no public Python modules, and generates just a single application binary package.

       Information is taken from setup.py's generated .egg-info file: author, project name, description, version, upstream  source,  license,  and
       required  and  provided	Python	modules  (which  are translated to Debian python library package names, and automatically added as package
       dependencies).

       It generates a simple cdbs/python-support rules file.

       python-mkdebian was designed to be used with the DistUtilsExtra.auto module, which calculates required Python  dependencies  automatically.
       However,  it  makes  no	explicit assumptions about DistUtilsExtra, so if setup.py has complete information it will work with any distutils
       setup.

OPTIONS

       --force-control=FORCE_CONTROL
	      Force control file behaviour. Can be one of "none" (keep unchanged), "deps" (only update dependencies), or  "full"  (recreate  whole
	      file). By default only dependencies will be updated ("deps").

       --force-copyright
	      Force whole copyright file to be recreated. By default it will not touch an already existing copyright file, so that you can custom-
	      ize them.

       --force-rules
	      Force whole rules file to be recreated. By default it will not touch an already existing rules file, so that you can customize them.

       --changelog=CHANGELOG
	      Add changelog entry to debian/changelog (can be specified multiple times)

       --dependency=PACKAGENAME
	      Add additional debian package dependency (can be specified multiple times)

       --prefix=PREFIX
	      Ask for installing all your modules in the dedicated PREFIX (default is /usr)

       --version
	      Show program's version number and exit

       -h, --help
	      Show this help message and exit

SEE ALSO

       Python help for the distutils module

AUTHOR

       python-mkdebian is developed by Martin Pitt <martin.pitt@ubuntu.com>.

python-mkdebian 						     May 2010							PYTHON-MKDEBIAN(1)
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