gzip header write OS field

[wungad]

BPO	39121
Nosy	@serhiy-storchaka, @wungad
PRs	bpo-39121: write gzip header OS information #17682

^{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 = None
closed_at = None
created_at = <Date 2019-12-23.00:39:47.863>
labels = ['type-feature', 'library', '3.9']
title = 'gzip header write OS field'
updated_at = <Date 2019-12-23.14:51:19.437>
user = 'https://github.com/wungad'

bugs.python.org fields:

activity = <Date 2019-12-23.14:51:19.437>
actor = 'wungad'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-12-23.00:39:47.863>
creator = 'wungad'
dependencies = []
files = []
hgrepos = []
issue_num = 39121
keywords = ['patch']
message_count = 3.0
messages = ['358801', '358805', '358818']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'wungad']
pr_nums = ['17682']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39121'
versions = ['Python 3.9']

[wungad]

Files written with gzip module write a value of 255 (unknown) at the 10th position in the header which defined what OS was used when gzip file was written.
Files written with gzip linux command correctly set that field to the value of 3 (Unix).
This ehancement does that.

[serhiy-storchaka]

The OS field is used in determining end-of-line convention for text files. But since we do not set the FTEXT flag, all files are binary. RFC 1952

Why do you need to set this field?

[wungad]

I do not need it for personaly, but since RFC exists and since linux
command line equivalent writes OS information, why should python gzip
implementation not include that.
The same goes for the FCOMMENT field for wich I also have a patch ready and
I they're both nice enhancements.

On Mon, 23 Dec 2019 at 09:04, Serhiy Storchaka <report@bugs.python.org>
wrote:

Serhiy Storchaka <storchaka+cpython@gmail.com> added the comment:

The OS field is used in determining end-of-line convention for text files.
But since we do not set the FTEXT flag, all files are binary. RFC 1952

Why do you need to set this field?

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue39121\>

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