Eryk Sun <eryk...@gmail.com> added the comment:
Serhiy, do you also plan to work around immutable files in POSIX? What about
permissions on directories that prevent deleting files?
In BSD and macOS, we have os.chflags for modifying file flags. Modifying the
immutable flag requires superuser access. In Linux, modifying the immutable
attribute requires the CAP_LINUX_IMMUTABLE capability, and file attributes are
accessed with an ioctl call. For example:
import os
import fcntl
import array
EXT2_IOC_GETFLAGS = 0x80086601
EXT2_IOC_SETFLAGS = 0x40086602
EXT2_IMMUTABLE_FL = 0x00000010
def make_mutable(filename):
flags = array.array('l', [0])
fd = os.open(filename, os.O_RDONLY)
try:
fcntl.ioctl(fd, EXT2_IOC_GETFLAGS, flags, True)
flags[0] &= ~EXT2_IMMUTABLE_FL
fcntl.ioctl(fd, EXT2_IOC_SETFLAGS, flags)
finally:
os.close(fd)
I assume for Windows this will use os.chmod. I need to rant a bit to see
whether anyone else is bothered by this. Microsoft's chmod function modifies
the readonly attribute as if it's a write/delete permission. I wish Python
hadn't adopted this behavior, since it clashes with how chmod works on other
platforms, none of which conflates native file attributes and permissions. (We
can be granted permission to modify or delete an immutable file, but this
doesn't enable us to modify the file until it's made mutable.) It would be nice
to have os.get_file_attributes and os.set_file_attributes on Windows instead of
this confused use of chmod.
----------
nosy: +eryksun
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue26660>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
