run command or do it in the script

[Skaperen]

i was considering the decision of how to copy the permissions of a file to another file, should a do the os functions or just run the "chmod" command with the --reference option. i'm thinking i should create a module of functions that do these things that various commands do, to avoid the overhead of the command or the complexity of DIY. should i make that module? "chmodref()" would be its first function.

[ndc85430]

Why wouldn't you just use the standard library functions?

[Gribouillis]

A friendly interface is that of module plumbum

>>> from plumbum.cmd import chmod
>>> chmod('--reference', 'cvi1.png', 'cvi2.png')
''

[Skaperen]

so running a command in a process is considered better or did they make that just for the convenience of those that have decided that it is better? i went ahead and made a couple functions.

from os import chmod,stat
def chmodref(rfn,fn,filenotfound1=None,filenotfound2=None):
    try:
        rstat = stat(rfn,follow_symlinks=False)
    except FileNotFoundError:
        return filenotfound1
    try:
        return chmod(fn,rstat.st_mode&4095,follow_symlinks=False)
    except FileNotFoundError:
        return filenotfound2

from os import chown,stat
def chownref(rfn,fn,filenotfound1=None,filenotfound2=None):
    try:
        rstat = stat(rfn,follow_symlinks=False)
    except FileNotFoundError:
        return filenotfound1
    try:
        return chown(fn,rstat.st_uid,rstat.st_gid,follow_symlinks=False)
    except FileNotFoundError:
        return filenotfound2