/
query.go
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/
query.go
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// Copyright © 2016 Asteris, LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package query
import (
"errors"
"github.com/asteris-llc/converge/resource"
"github.com/asteris-llc/converge/resource/shell"
"golang.org/x/net/context"
)
// Query represents an environmental query
type Query struct {
*shell.Shell `re-export-as:"task"`
}
// Apply is a nop for queries. Because HasChanges always returns false this
// should never be executed.
func (q *Query) Apply(context.Context) (resource.TaskStatus, error) {
return nil, errors.New("query apply called but it should never have changes")
}
// TaskStatus implementation overrides
// Messages returns a summary of the first execution of check and/or apply.
// Subsequent runs are surpressed.
func (q *Query) Messages() (messages []string) {
return
}
// HasChanges returns true if changes are required as determined by the the most
// recent run of check.
func (q *Query) HasChanges() bool {
return false
}