m.a.d.cat :
I am saving data that I guess could be deemed metadata on a JSON serialized file:
os.setxattr('/var/tmp/test.json', 'user.keyname', b'value')
and I can get the bytes value back via:
os.getxattr('/var/tmp/test.json', 'user.keyname')
The only way I can get this to work is by putting user. in front of the key/name that I want to use. Why is this?
Peter Wood :
https://www.tuxera.com/community/ntfs-3g-advanced/extended-attributes/
On Linux, specifically, four categories of extended attributes have been defined :
- trusted: to record properties which should only be accessed by the kernel,
- security: to record security properties of a file,
- system: to record other system related properties on which the file owner has some control,
- user: to record properties defined by applications.
The names of the extended attributes must be prefixed by the name of the category and a dot, hence these categories are generally qualified as name spaces.
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