[PATCH proxmox{-backup,-mail-forward} 0/5] forward mails through notification worker; PDM compatibility

[Lukas Wagner <l.wagner@proxmox.com>]

Forwarding through the worker has a couple of benefits:
  - We don't need to bump proxmx-mail-forwarder for changes in proxmox-notify (at
    least as soon as PVE uses a similar approach as well)
  - any notification state (history, tokens) becomes easier to reason
    about if there is only one process touching it
  - we can move the Context trait implementations from proxmox_notify to the
    actual product code again

Technically we'd need a versioned break between proxmox-backup and
proxmox-mail-forward, due to the 'mail-forwarder' feature that was not enabled in PBS
before, as well as the changed spool directory. If proxmox-mail-forward is
updated without updating proxmox-backup, forwarding the mail would fail due to

  - /var/lib/proxmox-backup/notifications/queue not existing
  - proxmox-backup not being able to deserialize notifications of the 'Forwarded Mail' kind

I don't think there is a way around this breakage, but we *could* defuse it by:

  - keep sending the old way (by directly calling into proxmox_notify)
  - but still change PBS to enable the 'mail-forwarder' feature and use the new spool-dir path
  - at some point in the future we switch proxmox-mail-forward to use the
    queue-based/worker approach, making it less likely that someone still
    holds back a proxmox-backup update, which would break forwarding

I'll leave this decision to the PBS maintainers, just tell me which approach is
preferrable, then I'll adapt the series if needed.


proxmox-backup:

Lukas Wagner (2):
  notifications: move spool directory to
    /var/lib/proxmox-backup/notifications/queue
  pull in 'mail-forwarder' feature for proxmox-notify

 Cargo.toml                      |  2 +-
 src/server/notifications/mod.rs | 30 ++++++++++++++++++++++++------
 2 files changed, 25 insertions(+), 7 deletions(-)


proxmox-mail-forward:

Lukas Wagner (3):
  forward using PBS' notification worker
  forward mails on PDM installations as well
  only ever forward for one product, favoring PVE over PBS over PDM

 Cargo.toml  |   3 +-
 src/main.rs | 129 +++++++++++++++++++++++++++++-----------------------
 2 files changed, 74 insertions(+), 58 deletions(-)


Summary over all repositories:
  4 files changed, 99 insertions(+), 65 deletions(-)

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