new: [0km] allow ``vps-setup`` to bypass domain type check and force domain name change

Print an additional warning message to clarify why domain name is not
changed and how to force the change.

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

bin/0km

@@ -867,6 +867,10 @@ cmdline.spec::cmd:vps-setup:run() {
 
     : :posarg: HOST        'Target host to check/fix ssh-access'
 
+    : :optfla: --force,-f  "Will force domain name change, even if
+                            current hostname was not recognized as
+                            an ovh domain name. "
+
     depends sshpass shyaml
 
     KEY_PATH="ssh-access.public-keys"
@@ -968,19 +972,22 @@ cmdline.spec::cmd:vps-setup:run() {
     if ! is_ovh_domain_name "$HOST" && ! str_is_ipv4 "$HOST"; then
             Section Checking hostname
             Elt "Checking /etc/hostname..."
-            if [ "$old" != "$HOST" ]; then
-                old="$(ssh:run "$host" -- $sudo_if_necessary cat /etc/hostname)"
-                Elt "Hostname is '$old'"
-                if is_ovh_hostname "$old"; then
-                    Elt "Hostname '$old' --> '$HOST'"
+            old_etc_hostname="$(ssh:run "$host" -- $sudo_if_necessary cat /etc/hostname)"
+            if [ "$old_etc_hostname" != "$HOST" ]; then
+                Elt "/etc/hostname is '$old_etc_hostname'"
+                if is_ovh_hostname "$old_etc_hostname" || [ -n "$opt_force" ]; then
+                    Elt "Hostname '$old_etc_hostname' --> '$HOST'"
                     print_info "creating"
                     echo "$HOST" | ssh:run "$host" -- $sudo_if_necessary tee /etc/hostname >/dev/null &&
                         ssh:run "$host" -- $sudo_if_necessary hostname "$HOST"
                     Feedback || return 1
                 else
-                    print_info "not changing"
+                    Elt "Hostname '$old_etc_hostname' isn't an ovh domain"
+                    print_info "no change"
                     print_status noop
                     Feed
+                    warn "Domain name was not changed because it was already set"
+                    echo "  (use \`-f\` or \`--force\`) to force domain name change to $HOST." >&2
                 fi
 
             else