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Support systemd socket activation support more comprensively #7892

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Motivation

We now support:

  1. Multiple sockets, per the systemd socket activation spec

  2. The sockets not having pid/uid/gid peer info because they might not be Unix domain sockets.

Context

The changes are by @edolstra, taken from #5265. This is just that PR without the TCP parts, which I gathered are the controversial parts. Hopefully this remainder is not so controversial.

Checklist for maintainers

Maintainers: tick if completed or explain if not relevant

  • agreed on idea
  • agreed on implementation strategy
  • tests, as appropriate
    • functional tests - tests/**.sh
    • unit tests - src/*/tests
    • integration tests - tests/nixos/*
  • documentation in the manual
  • code and comments are self-explanatory
  • commit message explains why the change was made
  • new feature or incompatible change: updated release notes

@Ericson2314 Ericson2314 marked this pull request as draft February 23, 2023 17:48
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Will need to fix macOS failure.

@Ericson2314 Ericson2314 force-pushed the systemd-multi-socket branch from f38006b to 9aedd37 Compare March 16, 2023 23:45
@Ericson2314 Ericson2314 force-pushed the systemd-multi-socket branch 2 times, most recently from 310266c to ab3a602 Compare April 8, 2023 22:14
We now support:

1. Multiple sockets, per the systemd socket activation spec

2. The sockets not having pid/uid/gid peer info because they might not
   be Unix domain sockets.

3. `--stdio` on the new `nix daemon`, not just the old `nix-daemon`.

In addition, `PeerInfo` is made more type safe with `std::optional`.

These changes are by @edolstra, taken from NixOS#5265. This is just that PR
*without* the TCP parts, which I gathered are the controversial parts.
Hopefully this remainder is not so controversial.
@Ericson2314 Ericson2314 force-pushed the systemd-multi-socket branch from ab3a602 to 864ff3d Compare May 10, 2023 22:06
@github-actions github-actions bot added the new-cli Relating to the "nix" command label May 10, 2023
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