forked from digitalocean/atc
/
run_script.go
153 lines (125 loc) · 2.79 KB
/
run_script.go
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package resource
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"code.cloudfoundry.org/garden"
"github.com/tedsuo/ifrit"
)
var ErrAborted = errors.New("script aborted")
const resourceProcessIDPropertyName = "concourse:resource-process"
const resourceResultPropertyName = "concourse:resource-result"
type ErrResourceScriptFailed struct {
Path string
Args []string
ExitStatus int
Stderr string
}
func (err ErrResourceScriptFailed) Error() string {
msg := fmt.Sprintf(
"resource script '%s %v' failed: exit status %d",
err.Path,
err.Args,
err.ExitStatus,
)
if len(err.Stderr) > 0 {
msg += "\n\nstderr:\n" + err.Stderr
}
return msg
}
func (resource *resource) runScript(
path string,
args []string,
input interface{},
output interface{},
logDest io.Writer,
recoverable bool,
) ifrit.Runner {
return ifrit.RunFunc(func(signals <-chan os.Signal, ready chan<- struct{}) error {
request, err := json.Marshal(input)
if err != nil {
return err
}
if recoverable {
result, err := resource.container.Property(resourceResultPropertyName)
if err == nil {
return json.Unmarshal([]byte(result), &output)
}
}
stdout := new(bytes.Buffer)
stderr := new(bytes.Buffer)
processIO := garden.ProcessIO{
Stdin: bytes.NewBuffer(request),
Stdout: stdout,
}
if logDest != nil {
processIO.Stderr = logDest
} else {
processIO.Stderr = stderr
}
var process garden.Process
var processID string
if recoverable {
processID, err = resource.container.Property(resourceProcessIDPropertyName)
if err != nil {
processID = ""
}
}
if processID != "" {
process, err = resource.container.Attach(processID, processIO)
if err != nil {
return err
}
} else {
process, err = resource.container.Run(garden.ProcessSpec{
Path: path,
Args: args,
}, processIO)
if err != nil {
return err
}
if recoverable {
err := resource.container.SetProperty(resourceProcessIDPropertyName, process.ID())
if err != nil {
return err
}
}
}
close(ready)
processExited := make(chan struct{})
var processStatus int
var processErr error
go func() {
processStatus, processErr = process.Wait()
close(processExited)
}()
select {
case <-processExited:
if processErr != nil {
return processErr
}
if processStatus != 0 {
return ErrResourceScriptFailed{
Path: path,
Args: args,
ExitStatus: processStatus,
Stderr: stderr.String(),
}
}
if recoverable {
err := resource.container.SetProperty(resourceResultPropertyName, stdout.String())
if err != nil {
return err
}
}
return json.Unmarshal(stdout.Bytes(), output)
case <-signals:
resource.container.Stop(false)
<-processExited
return ErrAborted
}
})
}