new: [mongo] make ``mongosh`` use ``ensure_db_docker_running`` instead of failing if no containers are up

mongo/actions/relations/mongo-database/mongosh

@@ -22,12 +22,11 @@ service.
 
 EXAMPLES:
 
-  $exname < foo.sql
-  $exname mydb2 < foo.sql
+  $exname < foo.mongosh
+  $exname mydb2 < foo.mongosh
 
 "
 
-
 dbname=
 output=
 while [ "$1" ]; do
@@ -56,41 +55,34 @@ done
 
 
 if [ -z "$dbname" ]; then
-
-    ##
-    ## Fetch default dbname in relation to mongo-database
-    ##
-
-    ## XXXvlab: can't get real config here
-    if ! read-0 ts _ _ < <(get_service_relation "$SERVICE_NAME" "mongo-database"); then
-        err "Couldn't find relation ${DARKCYAN}mongo-database${NORMAL}."
+    if ! dbname=$(relation:get "$SERVICE_NAME":mongo-database dbname) || [ -z "$dbname" ]; then
+        err "Couldn't retrieve information of ${DARKCYAN}mongo-database${NORMAL}'s relation."
+        echo "  You're database has maybe not yet be initialized." >&2
         exit 1
     fi
+fi
 
-    relation_dir=$(get_relation_data_dir "$SERVICE_NAME" "$ts" "mongo-database") || {
-        err "Failed to find relation dir"
-        exit 1
-    }
-    mongo_config=$(cat "$relation_dir"/data) || exit 2
 
-    dbname="$(e "$mongo_config" | shyaml get-value dbname)" || {
-        err "Couldn't retrieve information of ${DARKCYAN}mongo-database${NORMAL}'s relation."
-        exit 1
-    }
+mongosh() {
+    local dbname="$1"
+    (
 
-fi
+        export SERVICE_NAME="$RELATION_TARGET_SERVICE"
+        export SERVICE_DATASTORE="$DATASTORE/$SERVICE_NAME"
+        DOCKER_BASE_IMAGE=$(service_base_docker_image "$SERVICE_NAME")
+        export DOCKER_BASE_IMAGE
 
-set -e
+        target_charm_path=$(charm.get_dir $RELATION_TARGET_CHARM) || exit 1
 
-containers="$(get_running_containers_for_service "$RELATION_TARGET_SERVICE")"
+        set +e
 
-if [ -z "$containers" ]; then
-    err "No containers running for service $DARKYELLOW$service$NORMAL."
-    exit 1
-fi
+        . "$target_charm_path/lib/common"
+
+        set -e
+        ensure_db_docker_running
 
+        ddb "$dbname"
+    )
+}
 
-## XXXvlab: taking first container is probably not a good idea
-container_id="$(echo "$containers" | head -n 1)"
-docker exec -i -u 0 \
-       "${container_id}" mongo --quiet "$dbname"
+mongosh "$dbname"