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// Package exec provides utilities for executing Open Container Initative runtime hooks.
package exec
import (
"bytes"
"context"
"fmt"
"io"
osexec "os/exec"
"time"
rspec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// DefaultPostKillTimeout is the recommended default post-kill timeout.
const DefaultPostKillTimeout = time.Duration(10) * time.Second
// Run executes the hook and waits for it to complete or for the
// context or hook-specified timeout to expire.
func Run(ctx context.Context, hook *rspec.Hook, state []byte, stdout io.Writer, stderr io.Writer, postKillTimeout time.Duration) (hookErr, err error) {
cmd := osexec.Cmd{
Path: hook.Path,
Args: hook.Args,
Env: hook.Env,
Stdin: bytes.NewReader(state),
Stdout: stdout,
Stderr: stderr,
}
if cmd.Env == nil {
cmd.Env = []string{}
}
if hook.Timeout != nil {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, time.Duration(*hook.Timeout)*time.Second)
defer cancel()
}
err = cmd.Start()
if err != nil {
return err, err
}
exit := make(chan error, 1)
go func() {
err := cmd.Wait()
if err != nil {
err = errors.Wrapf(err, "executing %v", cmd.Args)
}
exit <- err
}()
select {
case err = <-exit:
return err, err
case <-ctx.Done():
if err := cmd.Process.Kill(); err != nil {
logrus.Errorf("failed to kill pid %v", cmd.Process)
}
timer := time.NewTimer(postKillTimeout)
defer timer.Stop()
select {
case <-timer.C:
err = fmt.Errorf("failed to reap process within %s of the kill signal", postKillTimeout)
case err = <-exit:
}
return err, ctx.Err()
}
}
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