new: [vps] add ``vps monujo set-version`` command

bin/vps

@@ -147,6 +147,12 @@ compose:has-container-project-myc() {
     [[ $'\n'"$projects"$'\n' == *$'\n'"myc"$'\n'* ]]
 }
 
+compose:service:exists() {
+    local project="$1" service="$2" service_cfg
+    service_cfg=$(cat "$(compose:get-compose-yml)" |
+                       shyaml get-value -y "$service" 2>/dev/null) || return 1
+    [ -n "$service_cfg" ]
+}
 
 compose:file:value-change() {
     local key="$1" value="$2"
@@ -2517,4 +2523,33 @@ cmdline.spec::cmd:bench:run() {
 }
 
 
+cmdline.spec::cmd:monujo:run() {
+    :
+}
+
+cmdline.spec.gnu monujo
+cmdline.spec:monujo:cmd:set-version:run() {
+
+    : :posarg: TARGET_VERSION  "Target version to put in options"
+    : :optval: --service,-s      "The monujo service name (defaults to 'monujo')"
+
+    local URL
+
+    monujo_service="${opt_service:-monujo}"
+    project_name=$(compose:project_name) || exit 1
+
+    ## check if service exists in compose.yml
+    compose:service:exists "$project_name" "$monujo_service" || {
+        err "Service '$monujo_service' was not found in current 'compose.yml'."
+        exit 1
+    }
+
+    Wrap -d "Changing ${DARKYELLOW}$monujo_service${NORMAL} version" -- \
+         compose:file:value-change \
+         "${monujo_service}.options.version" \
+         "${TARGET_VERSION}" || exit 1
+
+}
+
+
 cmdline::parse "$@"