--- a/sbin/fjail	Tue Nov 29 11:10:24 2022 +0100
+++ b/sbin/fjail	Wed Nov 30 09:46:29 2022 +0100
@@ -57,7 +57,7 @@
 
     Populate the jail directory in MOUNTPOINT with the base system in BASETXZ
 
-  configure MOUNTPOINT
+  configure [OPTIONS] MOUNTPOINT
 
     Configure some basic parts of the system at MOUNTPOINT:
     disable root password, syslog and other basic configuration settings
@@ -65,6 +65,8 @@
     Also handle thin jails by checking whether "etc" is a symlink to
     "skeleton/etc".
 
+    -d        Temporarily mount a devfs filesystem to MOUNTPOINT/dev
+
    hostid
 
      Print proposals for a hostuuid and hostid
@@ -359,8 +361,29 @@
 command_configure() {
     # mountpoint
     local _mp
+    local _opt_devfs
 
-    local _pcl
+    local _pcl _umount_devfs
+
+    _umount_devfs=""
+
+    _opt_devfs=""
+    while getopts "d" _opt ; do
+        case ${_opt} in
+            d)
+                _opt_devfs="yes"
+                ;;
+            \?)
+                return 2;
+                ;;
+            *)
+                echo "ERROR: option handling failed" 1>&2
+                return 2
+                ;;
+        esac
+    done
+    shift $((OPTIND-1))
+    OPTIND=1
 
     _mp="$1"
 
@@ -373,6 +396,16 @@
         return 1
     fi
 
+    if [ "${_opt_devfs}" = "yes" ]; then
+        if [ ! -c "{_mp}/dev/null" ]; then
+            echo "Mounting devfs"
+            mount -t devfs devfs "${_mp}/dev"
+            _umount_devfs="yes"
+        else
+            echo "devfs is already mounted"
+        fi
+    fi
+
     # Deactive the by default empty root password
     pw -R "${_mp}" usermod -w no -n root
 
@@ -432,6 +465,11 @@
     fi
 
     command_hostid
+
+    if [ "${_umount_devfs}" = "yes" ]; then
+        echo "Unmounting devfs"
+        umount "{_mp}/dev"
+    fi
 }