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Use restrict key option and relative borg command

Merged Use restrict key option and relative borg command
simplify-borg_client-authorized_keys into master
Merged Evangelos Foutras requested to merge simplify-borg_client-authorized_keys into master
  1. Jun 28, 2021
    • Evangelos Foutras's avatar
      Use restrict key option and relative borg command · 3561a383
      Evangelos Foutras authored 
      No functional change; the "restrict" key option is a shorthand for:

- no-agent-forwarding
- no-port-forwarding
- no-X11-forwarding
- no-pty
- no-user-rc

It was added in OpenSSH 7.2 (2016-02-29) as a convenient way to specify
an authorized key should have "all current and future key restrictions"
applied to it.

Also switch to a relative borg command since its location is not really
standardized; on rsync.net it appears to be located under usr/local/bin
(though /usr/bin/borg works too, even if it doesn't exist!) and Hetzner
just forces its own command, ignoring ours. :cat:

The Borg documentation seems to agree with both the above alterations:

[1] https://borgbackup.readthedocs.io/en/stable/usage/serve.html
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