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check.go
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check.go
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package cessna
import (
"bytes"
"encoding/json"
"code.cloudfoundry.org/garden"
"code.cloudfoundry.org/lager"
"github.com/concourse/atc"
"github.com/tedsuo/ifrit"
)
type ResourceCheck struct {
Resource
Version *atc.Version
}
func (r ResourceCheck) Check(logger lager.Logger, worker Worker) (CheckResponse, error) {
rootFSPath, err := r.ResourceType.RootFSPathFor(logger, worker)
if err != nil {
return nil, err
}
// Turn RootFS COW into Container
gardenSpec := garden.ContainerSpec{
Privileged: true,
RootFSPath: rootFSPath,
}
gardenContainer, err := worker.GardenClient().Create(gardenSpec)
if err != nil {
logger.Error("failed-to-create-gardenContainer-in-garden", err)
return nil, err
}
runner, err := r.newCheckCommandProcess(gardenContainer)
if err != nil {
return nil, err
}
checking := ifrit.Invoke(runner)
err = <-checking.Wait()
if err != nil {
return nil, err
}
return runner.Response()
}
func (r ResourceCheck) newCheckCommandProcess(container garden.Container) (*checkCommandProcess, error) {
p := &ContainerProcess{
Container: container,
ProcessSpec: garden.ProcessSpec{
Path: "/opt/resource/check",
},
}
i := CheckRequest{
Source: r.Source,
}
if r.Version != nil {
i.Version = *r.Version
}
input, err := json.Marshal(i)
if err != nil {
return nil, err
}
var (
stdout bytes.Buffer
stderr bytes.Buffer
)
p.ProcessIO.Stdin = bytes.NewBuffer(input)
p.ProcessIO.Stdout = &stdout
p.ProcessIO.Stderr = &stderr
return &checkCommandProcess{
ContainerProcess: p,
out: &stdout,
err: &stderr,
}, nil
}
type checkCommandProcess struct {
*ContainerProcess
out *bytes.Buffer
err *bytes.Buffer
}
func (c *checkCommandProcess) Response() (CheckResponse, error) {
var o CheckResponse
err := json.NewDecoder(c.out).Decode(&o)
if err != nil {
return nil, err
}
return o, nil
}