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// Copyright (c) 2018, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package exec
import (
"bytes"
"context"
"encoding/json"
"fmt"
"os/exec"
"time"
"github.com/opencontainers/runtime-spec/specs-go"
)
// Hook execute an OCI hook command and pass state over stdin.
func Hook(ctx context.Context, hook *specs.Hook, state *specs.State) error {
var cancel context.CancelFunc
var timeout time.Duration
var cmd *exec.Cmd
if hook.Timeout != nil {
timeout = time.Duration(*hook.Timeout) * 1000 * time.Millisecond
}
if timeout != 0 {
ctx, cancel = context.WithTimeout(ctx, timeout)
defer cancel()
}
if ctx != nil {
cmd = exec.CommandContext(ctx, hook.Path)
} else {
cmd = exec.Command(hook.Path)
}
data, err := json.Marshal(state)
if err != nil {
return fmt.Errorf("failed to marshal state data: %s", err)
}
cmd.Stdin = bytes.NewReader(data)
cmd.Env = hook.Env
cmd.Args = hook.Args
err = cmd.Start()
if err != nil {
return fmt.Errorf("failed to execute hook %s: %s", hook.Path, err)
}
err = cmd.Wait()
if err != nil {
return fmt.Errorf("hook execution failed: %s", err)
}
if ctx != nil && ctx.Err() == context.DeadlineExceeded {
return fmt.Errorf("hook time out")
}
return err
}
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