drone-yaml/yaml/linter/config.go

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// Copyright 2019 Drone IO, Inc.
//
// 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.
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package linter
import (
"errors"
"github.com/drone/drone-yaml/yaml"
)
// ErrDuplicatePipelineName is returned when two Pipeline
// resources have the same name.
var ErrDuplicatePipelineName = errors.New("linter: duplicate pipeline names")
// ErrMissingPipelineDependency is returned when a Pipeline
// defines dependencies that are invlid or unknown.
var ErrMissingPipelineDependency = errors.New("linter: invalid or unknown pipeline dependency")
// ErrCyclicalPipelineDependency is returned when a Pipeline
// defines a cyclical dependency, which would result in an
// infinite execution loop.
var ErrCyclicalPipelineDependency = errors.New("linter: cyclical pipeline dependency detected")
// ErrPipelineSelfDependency is returned when a Pipeline
// defines a dependency on itself.
var ErrPipelineSelfDependency = errors.New("linter: pipeline cannot have a dependency on itself")
// Manifest performs lint operations for a manifest.
func Manifest(manifest *yaml.Manifest, trusted bool) error {
return checkPipelines(manifest, trusted)
}
func checkPipelines(manifest *yaml.Manifest, trusted bool) error {
names := map[string]struct{}{}
for _, resource := range manifest.Resources {
switch v := resource.(type) {
case *yaml.Pipeline:
_, ok := names[v.Name]
if ok {
return ErrDuplicatePipelineName
}
names[v.Name] = struct{}{}
err := checkPipelineDeps(v, names)
if err != nil {
return err
}
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if v.Kind == "pipeline" && (v.Type == "" || v.Type == "docker") {
err = checkPipeline(v, trusted)
if err != nil {
return err
}
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}
}
}
return nil
}
func checkPipelineDeps(pipeline *yaml.Pipeline, deps map[string]struct{}) error {
for _, dep := range pipeline.DependsOn {
_, ok := deps[dep]
if !ok {
return ErrMissingPipelineDependency
}
if pipeline.Name == dep {
return ErrPipelineSelfDependency
}
}
return nil
}