feat: packages, services and updates

The write side NetOrk/netork#799 needs, on both drivers.

- Packages: get_packages (FreeBSD `pkg query` with the repository as
  source, nothing on a classic system without pkg; OpenBSD `pkg_info`),
  install_package / uninstall_package as root (`pkg install`/`pkg
  delete`, `pkg_add -I`/`pkg_delete`), names checked before anything is
  sent, a failure raised with what the tool printed.
- Updates: get_available_updates. FreeBSD `pkg upgrade -n`, with
  `security` from VuXML (`pkg audit`: True for a listed package, False for
  any other, None when the audit could not run); OpenBSD `pkg_add -u -n
  -v` (no security verdict). Base-system patches are one `base-system`
  entry, as decided in #799: OpenBSD's `syspatch -c`, and on a classic
  FreeBSD what `freebsd-update` has fetched; on pkgbase the base system is
  packages from FreeBSD-base.
- Services: get_services lists the enabled ones (FreeBSD `service ...
  status` as root, as root-only pidfiles hide daemons otherwise, without
  root when sudo refuses; OpenBSD `rcctl check`), manage_service runs
  start/stop/restart/enable/disable as root and returns success and
  output.

Fixtures recorded on the FreeBSD 15.1 and OpenBSD 7.9 VMs with genuinely
outdated packages (FreeBSD pointed at the latest branch, an OpenBSD
package taken back to its release build). Checked live on both, including
a service restart and installing and removing a package.

napalm_bsd/freebsd.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 from napalm_device_types import FingerprintRule
 
 from napalm_bsd import parse
-from napalm_bsd.base import BsdDriver
+from napalm_bsd.base import BASE_SYSTEM, BsdDriver
 
 
 class FreeBSDDriver(BsdDriver):
@@ -35,6 +35,68 @@ class FreeBSDDriver(BsdDriver):
     def _parse_listening(self, output: str, *, attributed: bool) -> list[dict]:
         return parse.sockstat(output)
 
+    PKG_QUERY = "pkg query '%n\t%v\t%R\t%sb\t%c'"
+    INSTALL_COMMAND = "pkg install -y {name}"
+    UNINSTALL_COMMAND = "pkg delete -y {name}"
+    # Root reads every daemon's pidfile; one-shot scripts have no status.
+    SERVICE_STATUS_COMMAND = (
+        "for s in $(service -e); do n=${s##*/}; "
+        'printf "%s\\t%s\\n" "$n" "$(service $n status 2>&1 | head -1)"; done'
+    )
+    SERVICE_ACTION_COMMAND = "service {name} {action}"
+
+    def _parse_services(self, output: str) -> list[dict]:
+        return parse.service_status(output)
+
+    def _has_pkg(self) -> bool:
+        """pkg is bootstrapped; a hand-installed classic system may have only the stub."""
+        return self.run_command("pkg -N").exit_code == 0
+
+    def get_packages(self) -> list[dict]:
+        return parse.pkg_query(self._out(self.PKG_QUERY)) if self._has_pkg() else []
+
+    def get_available_updates(self) -> list[dict]:
+        """Package updates from ``pkg upgrade -n``, and fetched base-system updates.
+
+        ``security`` comes from VuXML (``pkg audit``): True for a package it
+        lists as vulnerable, False for one it does not, None when the audit
+        could not run. On pkgbase the base system is packages from the
+        FreeBSD-base repository; a classic base reports one entry (#799).
+        """
+        updates: list[dict] = []
+        if self._has_pkg():
+            updates = parse.pkg_upgrades(self._out("pkg upgrade -n", privileged=True, timeout=300))
+            audit = self.run_command("pkg audit -Fq", privileged=True, timeout=120)
+            known = audit.exit_code in (0, 1)  # 1: vulnerable packages found
+            vulnerable = parse.pkg_audit(audit.stdout) if known else set()
+            for update in updates:
+                update["security"] = (update["name"] in vulnerable) if known else None
+            if "FreeBSD-base" in self._out("pkg repos -l").split():
+                return updates
+        return updates + self._base_updates()
+
+    def _base_updates(self) -> list[dict]:
+        """A classic base system's updates, as freebsd-update fetched them.
+
+        ``updatesready`` exits 0 when fetched updates wait to be installed and
+        2 when there are none; it does not fetch, which ``freebsd-update cron``
+        does daily where it is enabled.
+        """
+        ready = self.run_command(
+            "freebsd-update --not-running-from-cron updatesready", privileged=True, timeout=60
+        )
+        if ready.exit_code != 0:
+            return []
+        return [
+            {
+                "name": BASE_SYSTEM,
+                "current_version": self._out("freebsd-version -u"),
+                "new_version": "fetched by freebsd-update",
+                "origin": "freebsd-update",
+                "security": None,
+            }
+        ]
+
     def _os_version(self) -> str:
         version = super()._os_version()
         return f"FreeBSD {version}" if version else ""