Feature Add support of os.chflags() on Linux platform

[socketpair]

BPO	31313
Nosy	@pitrou, @larryhastings, @socketpair
Files	chiflag.c

^{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 2017-08-31.09:55:01.045>
labels = ['3.7', 'type-feature', 'library']
title = 'Feature Add support of os.chflags() on Linux platform'
updated_at = <Date 2017-09-01.09:27:54.508>
user = 'https://github.com/socketpair'

bugs.python.org fields:

activity = <Date 2017-09-01.09:27:54.508>
actor = 'pitrou'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-08-31.09:55:01.045>
creator = 'socketpair'
dependencies = []
files = ['47115']
hgrepos = []
issue_num = 31313
keywords = []
message_count = 5.0
messages = ['301043', '301046', '301089', '301091', '301092']
nosy_count = 4.0
nosy_names = ['pitrou', 'larry', 'neologix', 'socketpair']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31313'
versions = ['Python 3.7']

[socketpair]

Yes, chflags() is not supported by linux directly. But actually, Linux supports chflags functionality:

https://stackoverflow.com/questions/34176464/why-os-chflags-doesnt-work-under-linux

through

ioctl (fd, EXT2_IOC_SETFLAGS, <BITMASK_OF_FLAGS>)

[pitrou]

Judging by the ioctl name, this is ext2/ext3/ext4 specific?

[socketpair]

Well, it seems, you are right.

But there are another ioctls (maybe they are the same, I haven't checked):

FS_IOC_SETFLAGS
FS_IOC_GETFLAGS

http://man7.org/tlpi/code/online/book/files/chiflag.c.html (also attached)

[pitrou]

On Ubuntu 16.04 I get the following values:
EXT2_IOC_SETFLAGS = 0x40086602, FS_IOC_GETFLAGS = 0x80086601

[pitrou]

Uh, of course, we care about SETFLAGS here. Which gives:
EXT2_IOC_SETFLAGS = 0x40086602, FS_IOC_SETFLAGS = 0x40086602