new: [0km] add consistency check to ``vps-setup`` for content of ``/etc/hostname`` and output of ``hostname``

Signed-off-by: Valentin Lab <valentin.lab@kalysto.org>

bin/0km

@@ -988,6 +988,18 @@ cmdline.spec::cmd:vps-setup:run() {
                 print_status noop
                 Feed
             fi
+            Elt "Checking consistency between /etc/hostname and \`hostname\`..."
+            etc_hostname="$(ssh:run "$host" -- $sudo_if_necessary cat /etc/hostname)"
+            transient_hostname="$(ssh:run "$host" -- $sudo_if_necessary hostname)"
+            if [ "$etc_hostname" != "$transient_hostname" ]; then
+                print_info "change"
+                ssh:run "$host" -- $sudo_if_necessary hostname "$etc_hostname"
+                Feedback || return 1
+            else
+                print_info "consistent"
+                print_status noop
+                Feed
+            fi
     else
         info "Not changing domain as '$HOST' doesn't seem to be final domain."
     fi