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daemon: split owner daemon from root helper

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Move the supported systemd path to two services: an owner-user bangerd for
orchestration and a narrow root helper for bridge/tap, NAT/resolver, dm/loop,
and Firecracker ownership. This removes repeated sudo from daily vm and image
flows without leaving the general daemon running as root.

Add install metadata, system install/status/restart/uninstall commands, and a
system-owned runtime layout. Keep user SSH/config material in the owner home,
lock file_sync to the owner home, and move daemon known_hosts handling out of
the old root-owned control path.

Route privileged lifecycle steps through typed privilegedOps calls, harden the
two systemd units, and rewrite smoke plus docs around the supported service
model.

Verified with make build, make test, make lint, and make smoke on the
supported systemd host path.
This commit is contained in:
Thales Maciel 2026-04-26 12:43:17 -03:00
parent 3edd7c6de7
commit 59e48e830b
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GPG key ID: 33112E6833C34679
53 changed files with 3239 additions and 726 deletions
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13
internal/daemon/doc.go
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@ -1,9 +1,16 @@
// Package daemon hosts the Banger daemon process.
// Package daemon hosts the Banger owner-daemon process.
//
// The daemon exposes a JSON-RPC endpoint over a Unix socket. The
// *Daemon type is a thin composition root: it holds shared
// infrastructure (store, runner, logger, layout, config, listener)
// plus pointers to four focused services and forwards RPCs to them.
// infrastructure (store, runner, logger, layout, config, listener,
// privileged-ops adapter) plus pointers to four focused services and
// forwards RPCs to them.
//
// On the supported systemd install path, this package runs inside
// `bangerd.service` as the configured owner user and delegates
// privileged host-kernel operations to `bangerd-root.service` through
// the privileged-ops seam. Non-system/dev paths use the same seam with
// an in-process adapter instead.
//
// Services:
//