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Preserve file permissions in fakefs after add_real_file #1119
Description
Describe the bug
Suppose I have a real file /usr/bin/env, owned by root:root, with permissions 0755.
If I copy this file into a fake filesystem the user and group are preserved, but the permissions are changed to 0444.
How To Reproduce
Note: This assumes you are on a *nix system with an executable file /usr/bin/env on your real filesystem.
If not, substitute any other file owned by root with permissions 0755.
import os
from pyfakefs.fake_filesystem import FakeFilesystem
from pyfakefs.fake_os import FakeOsModule
file = '/usr/bin/env'
fs = FakeFilesystem()
fs.add_real_file(file)
real_permissions = oct(os.stat(file).st_mode)
print(f"{real_permissions=}")
fake_os = FakeOsModule(fs)
fake_permissions = oct(fake_os.stat(file).st_mode)
print(f"{fake_permissions=}")
# output
# real_permissions='0o100755'
# fake_permissions='0o100444'Your environment
Please run the following in the environment where the problem happened and
paste the output.
Linux-6.8.0-53-generic-x86_64-with-glibc2.39
Python 3.12.3 (main, Jan 17 2025, 18:03:48) [GCC 13.3.0]
pyfakefs 5.7.4
pytest 8.3.4
Activity
mrbean-bremen commentedon Feb 18, 2025
Thanks, I will have a look!
mrbean-bremen commentedon Feb 18, 2025
Ok, I completly forgot that this is expected behavior. By default, files from the real filesystem are mapped as read-only. From the documentation:
Replacing
fs.add_real_file(file)withfs.add_real_file(file, read_only=False)should give you the wanted behavior.Please check if this is sufficient for you.
mrbean-bremen commentedon Feb 28, 2025
Converting this to a discussion issue.
Or trying to... seems not to work at the moment.