Wait for Linux RustDesk service before setting password

scripts/Install-SguLinuxRustDeskClient.sh

@@ -198,6 +198,30 @@ EOF
 
     systemctl restart rustdesk
     systemctl is-active --quiet rustdesk || fail 'The RustDesk service did not start.'
+    wait_for_rustdesk_server
+}
+
+wait_for_rustdesk_server() {
+    local attempt
+    local candidate_id
+
+    # `systemctl is-active` only confirms that the launcher is alive.  On Linux
+    # it still needs to start the `--server` process for the greeter account.
+    # Calling `rustdesk --password` during that short window returns successfully
+    # but does not persist a password for the remote-access process.
+    for attempt in $(seq 1 20); do
+        if systemctl is-active --quiet rustdesk \
+            && pgrep -f '/usr/share/rustdesk/rustdesk --server' >/dev/null 2>&1; then
+            candidate_id=$(rustdesk --get-id 2>/dev/null | tail -n 1 | tr -d '[:space:]')
+            if [[ $candidate_id =~ ^[0-9]+$ ]]; then
+                RUSTDESK_ID=$candidate_id
+                return
+            fi
+        fi
+        sleep 1
+    done
+
+    fail 'The RustDesk greeter-side server did not become ready within 20 seconds.'
 }
 
 set_access_password() {
@@ -214,29 +238,17 @@ set_access_password() {
         chmod 600 "$secret_path"
     fi
 
-    rustdesk --password "$ACCESS_PASSWORD" >/dev/null
+    local password_result
+    wait_for_rustdesk_server
+    password_result=$(rustdesk --password "$ACCESS_PASSWORD" 2>&1) \
+        || fail "RustDesk rejected the permanent password update: $password_result"
+    [[ $password_result == *Done!* ]] \
+        || fail "RustDesk did not acknowledge the permanent password update: $password_result"
     rustdesk --option verification-method use-permanent-password >/dev/null
     rustdesk --option approve-mode password >/dev/null
-    if id lightdm >/dev/null 2>&1; then
-        local lightdm_uid
-        lightdm_uid=$(id -u lightdm)
-        runuser -u lightdm -- env HOME=/var/lib/lightdm \
-            XDG_CONFIG_HOME=/var/lib/lightdm/.config \
-            XDG_RUNTIME_DIR="/run/user/${lightdm_uid}" \
-            /usr/share/rustdesk/rustdesk --password "$ACCESS_PASSWORD" >/dev/null
-        runuser -u lightdm -- env HOME=/var/lib/lightdm \
-            XDG_CONFIG_HOME=/var/lib/lightdm/.config \
-            XDG_RUNTIME_DIR="/run/user/${lightdm_uid}" \
-            /usr/share/rustdesk/rustdesk --option verification-method use-permanent-password >/dev/null
-        runuser -u lightdm -- env HOME=/var/lib/lightdm \
-            XDG_CONFIG_HOME=/var/lib/lightdm/.config \
-            XDG_RUNTIME_DIR="/run/user/${lightdm_uid}" \
-            /usr/share/rustdesk/rustdesk --option approve-mode password >/dev/null
-    fi
     systemctl restart rustdesk
     systemctl is-active --quiet rustdesk || fail 'The RustDesk service did not restart after setting its permanent password.'
-    RUSTDESK_ID=$(rustdesk --get-id 2>/dev/null | tail -n 1 | tr -d '[:space:]')
-    [[ $RUSTDESK_ID =~ ^[0-9]+$ ]] || fail "RustDesk returned an invalid device ID: $RUSTDESK_ID"
+    wait_for_rustdesk_server
 }
 
 register_with_controller() {