Allow to pass fileobj to is_tarfile

[thomwiggers]

BPO	29435
Nosy	@ethanfurman, @thomwiggers, @tirkarthi, @woodruffw
PRs	bpo-29435: Allow is_tarfile to take a filelike obj #18090

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/ethanfurman'
closed_at = <Date 2020-01-23.02:26:01.082>
created_at = <Date 2017-02-03.14:37:33.153>
labels = ['type-feature', 'library', '3.9']
title = 'Allow to pass fileobj to is_tarfile'
updated_at = <Date 2020-01-23.02:50:14.325>
user = 'https://github.com/thomwiggers'

bugs.python.org fields:

activity = <Date 2020-01-23.02:50:14.325>
actor = 'yossarian'
assignee = 'ethan.furman'
closed = True
closed_date = <Date 2020-01-23.02:26:01.082>
closer = 'ethan.furman'
components = ['Library (Lib)']
creation = <Date 2017-02-03.14:37:33.153>
creator = 'twiggers'
dependencies = []
files = []
hgrepos = []
issue_num = 29435
keywords = ['patch']
message_count = 5.0
messages = ['286869', '360205', '360531', '360532', '360533']
nosy_count = 4.0
nosy_names = ['ethan.furman', 'twiggers', 'xtreak', 'yossarian']
pr_nums = ['18090']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29435'
versions = ['Python 3.9']

[thomwiggers]

The tarfile.is_tarfile() function only supports opening from paths. However, the Tarfile class also supports opening from fileobjs. It would be useful if the is_tarfile function would also accept those.

For reference, this is the current implementation:

cpython/Lib/tarfile.py

Line 2432 in fcc3915

def is_tarfile(name):

[woodruffw]

I'll take a stab at this. It looks like Tarfile.open takes an optional keyword that should make this straightforward.

[ethanfurman]

New changeset dd754ca by Ethan Furman (William Woodruff) in branch 'master':
bpo-29435: Allow is_tarfile to take a filelike obj (GH-18090)
dd754ca

[ethanfurman]

Thanks, William!

[woodruffw]

Thanks to you to!