v2.5.0: harden telemt user reloads

lib/telemt_config.sh

@@ -210,6 +210,25 @@ first_telemt_user_secret() {
     get_telemt_users_block "$config" | head -1 | sed 's/^[^=]*=[[:space:]]*//; s/^"//; s/".*$//' | tr -d ' '
 }
 
+telemt_users_block_has_main() {
+    local users_block="$1"
+    printf '%s\n' "$users_block" | awk -F= '
+        /^[[:space:]]*#/ || ! /=/ { next }
+        {
+            key=$1
+            gsub(/^[[:space:]]+|[[:space:]]+$/, "", key)
+            if (key ~ /^".*"$/ || key ~ /^\047.*\047$/) {
+                key=substr(key, 2, length(key) - 2)
+            }
+            if (key == "main") {
+                found=1
+                exit
+            }
+        }
+        END { exit found ? 0 : 1 }
+    '
+}
+
 replace_telemt_users_block() {
     local users_block="$1"
     local config="${2:-$TELEMT_CONFIG}"