Author: David Six Language: text
Description: Uses for extended attributes Timestamp: 2017-09-12 01:57:39 +0000
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  1. I have a few uses for extended attributes:
  3. 1. Storing S3 Metadata
  4. If you want to store data from S3 locally without loosing anything, you need to find a way to store some extra metadata that might be included, including ALCs. Since the principals in S3 are not translatable to unix-style users, ordinary Linux filesystem ACLs won't work. In my use case, I convert the ACL to YAML and store it in an extended attribute. Then it can be read on the command line or converted back and applied if a file needs to be re-uploaded.
  6. 2. Add bit-rot *detection* to a lesser filesystem
  7. While not a replacement for ZFS, storing the file's checksum in an extended attribute can ensure it is easily found when you want to verify the integrity of the data.
  9. 3. Thumbnails
  10. I haven't attempted this (yet), but Linux and some (but not all) filesystems support extended attributes with values 64k long. That is long enough for a small thumbnail to be attached to the full-size version.
  12. Thanks for the show and keep up the good work!
  13. David
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