1 files changed, 38 insertions, 1 deletions
diff --git a/cloudinit/distros/freebsd.py b/cloudinit/distros/freebsd.py
index 4268abe6..706d0743 100644
--- a/cloudinit/distros/freebsd.py
+++ b/cloudinit/distros/freebsd.py
@@ -6,7 +6,9 @@
 
 import os
 import re
+from functools import lru_cache
 from io import StringIO
+from typing import Optional
 
 import cloudinit.distros.bsd
 from cloudinit import log as logging
@@ -192,5 +194,40 @@ class Distro(cloudinit.distros.bsd.BSD):
             freq=PER_INSTANCE,
         )
 
+    @lru_cache()
+    def is_container(self) -> bool:
+        """return whether we're running in a container.
+        Cached, because it's unlikely to change."""
+        jailed, _ = subp.subp(["sysctl", "-n", "security.jail.jailed"])
+        if jailed.strip() == "0":
+            return False
+        return True
+
+    @lru_cache()
+    def virtual(self) -> str:
+        """return the kind of virtualisation system we're running under.
+        Cached, because it's unlikely to change."""
+        if self.is_container():
+            return "jail"
+        # map FreeBSD's kern.vm_guest to systemd-detect-virt, just like we do
+        # in ds-identify
+        VM_GUEST_TO_SYSTEMD = {
+            "hv": "microsoft",
+            "vbox": "oracle",
+            "generic": "vm-other",
+        }
+        vm, _ = subp.subp(["sysctl", "-n", "kern.vm_guest"])
+        vm = vm.strip()
+        if vm in VM_GUEST_TO_SYSTEMD:
+            return VM_GUEST_TO_SYSTEMD[vm]
+        return vm
+
+    @property
+    def is_virtual(self) -> Optional[bool]:
+        """Detect if running on a virtual machine or bare metal.
 
-# vi: ts=4 expandtab
+        This can fail on some platforms, so the signature is Optional[bool]
+        """
+        if self.virtual() == "none":
+            return False
+        return True