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supervision_tree.go
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supervision_tree.go
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// Copyright 2022, 2023 Chainguard, 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.
package s6
import (
"fmt"
"os"
"path/filepath"
)
func (sc *Context) CreateSupervisionDirectory(name string) (string, error) {
svbase := "sv"
svcdir := filepath.Join(svbase, name)
sc.Log.Debugf(" supervision dir: %s", svcdir)
if err := sc.fs.MkdirAll(svcdir, 0777); err != nil {
return svcdir, fmt.Errorf("could not make supervision directory: %w", err)
}
return svcdir, nil
}
func (sc *Context) WriteSupervisionTemplate(svcdir string, command string) error {
filename := filepath.Join(svcdir, "run")
file, err := sc.fs.OpenFile(filename, os.O_CREATE|os.O_WRONLY, 0755)
if err != nil {
return fmt.Errorf("could not create runfile: %w", err)
}
defer file.Close()
fmt.Fprintf(file, "#!/bin/execlineb\n%s\n", command)
return nil
}
func (sc *Context) WriteSupervisionServiceSimple(name string, command string) error {
sc.Log.Debugf("simple service: %s => %s", name, command)
svcdir, err := sc.CreateSupervisionDirectory(name)
if err != nil {
return err
}
if err := sc.WriteSupervisionTemplate(svcdir, command); err != nil {
return err
}
return nil
}
func (sc *Context) WriteSupervisionTree(services Services) error {
sc.Log.Infof("generating supervision tree")
// generate the leaves
for service, svccmd := range services {
if err := sc.WriteSupervisionServiceSimple(service, svccmd); err != nil {
return err
}
}
return nil
}