new: [compose-core] ensure compatibility with new shyaml rust implementation

bin/compose-core

@@ -355,7 +355,7 @@ export -f merge_yaml_str
 yaml_get_values() {
     local sep=${1:-$'\n'} value input type first elt
     input=$(cat -)
-    if [ -z "$input" ] || [ "$input" == "None" ]; then
+    if [ -z "$input" ] || [[ "$input" =~ ^None|null$ ]]; then
         return 0
     fi
     type=$(e "$input" | shyaml get-type)
@@ -1122,7 +1122,7 @@ get_docker_compose_links() {
         [ "$type" == "run-once" ] && continue
         if [ "$tech_dep" == "reversed" ]; then
             deps+=("$(echo -en "$master_target_service:\n  links:\n    - $master_service")")
-        elif [ "$tech_dep" == "True" ]; then
+        elif [[ "$tech_dep" =~ ^(True|true)$ ]]; then
             deps+=("$(echo -en "$master_service:\n  links:\n    - $master_target_service")")
         fi
         ## XXXvlab: an attempt to add depends_on, but this doesn't work well actually
@@ -1764,7 +1764,7 @@ cfg-get-value () {
         err "The key $WHITE$key$NORMAL was not found in relation's data."
         return 1
     fi
-    echo "$out" | yaml_get_interpret
+    printf "%s\n" "$out" | yaml_get_interpret
 }
 export -f cfg-get-value
 
@@ -1807,8 +1807,7 @@ export -f expand_vars
 yaml_get_interpret() {
     local content tag
     content=$(cat -)
-    tag=$(echo "$content" | shyaml -y get-value) || return 1
-    tag="${tag%% *}"
+    tag=$(echo "$content" | shyaml get-type) || return 1
     content=$(echo "$content" | shyaml get-value) || return 1
     if ! [ "${tag:0:1}" == "!" ]; then
         echo "$content" || return 1
@@ -2403,7 +2402,7 @@ _get_metadata_provides() {
         return 0
     fi
 
-    provides=$(printf "%s" "$metadata" | shyaml get-value -y -q provides "")
+    provides=$(printf "%s" "$metadata" | shyaml -q get-value -y provides "")
     [ "$provides" -a "$provides" != "''" ] || { touch "$cache_file"; return 0; }
 
     _get_provides_provides "$provides" | tee "$cache_file"
@@ -3171,7 +3170,7 @@ _get_master_service_for_service_cached () {
         return 0
     fi
 
-    if [ "$(echo "$metadata" | shyaml get-value "subordinate" 2>/dev/null)" != "True" ]; then
+    if ! [[ "$(echo "$metadata" | shyaml get-value "subordinate" 2>/dev/null)" =~ ^True|true$ ]]; then
         ## just return service name
         echo "$service" | tee "$cache_file"
         return 0
@@ -3295,7 +3294,7 @@ _get_docker_compose_mixin_from_metadata_cached() {
             mixins+=("$docker_compose")
         fi
 
-        if [ "$(echo "$metadata" | shyaml get-value "subordinate" 2>/dev/null)" == "True" ]; then
+        if [[ "$(echo "$metadata" | shyaml get-value "subordinate" 2>/dev/null)" =~ ^True|true$ ]]; then
             subordinate=true
         fi
     fi
@@ -4067,7 +4066,7 @@ _graph_service() {
     metadata=$(charm.metadata "$charm") || return 1
     subordinate=$(echo "$metadata" | shyaml get-value "subordinate" 2>/dev/null)
 
-    if [ "$subordinate" == "True" ]; then
+    if [[ "$subordinate" =~ ^True|true$ ]]; then
         requires="$(echo "$metadata" | shyaml get-value "requires" 2>/dev/null)"
         master_charm=
         while read-0 relation_name relation; do
@@ -4109,8 +4108,8 @@ _graph_node_service() {
 
     cat <<EOF
   "$(_graph_node_service_label ${service})" [
-     style = "filled, $([ "$subordinate" == "True" ] && echo "dashed" || echo "bold")"
-     penwidth = $([ "$subordinate" == "True" ] && echo "3" || echo "5")
+     style = "filled, $([[ "$subordinate" =~ ^True|true$ ]] && echo "dashed" || echo "bold")"
+     penwidth = $([[ "$subordinate" =~ ^True|true$ ]] && echo "3" || echo "5")
      color = $([ "$base" ] && echo "blue" || echo "black")
      fillcolor = "white"
      fontname = "Courier New"