125 lines
2.6 KiB
Go
125 lines
2.6 KiB
Go
package runhcs
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import (
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"bytes"
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"context"
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"fmt"
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"os"
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"os/exec"
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"sync"
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"github.com/containerd/go-runc"
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)
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// Format is the type of log formatting options available.
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type Format string
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const (
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none Format = ""
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// Text is the default text log ouput.
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Text Format = "text"
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// JSON is the JSON formatted log output.
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JSON Format = "json"
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command = "runhcs"
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)
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var bytesBufferPool = sync.Pool{
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New: func() interface{} {
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return bytes.NewBuffer(nil)
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},
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}
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func getBuf() *bytes.Buffer {
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return bytesBufferPool.Get().(*bytes.Buffer)
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}
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func putBuf(b *bytes.Buffer) {
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b.Reset()
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bytesBufferPool.Put(b)
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}
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// Runhcs is the client to the runhcs cli
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type Runhcs struct {
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// Debug enables debug output for logging.
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Debug bool
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// Log sets the log file path where internal debug information is written.
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Log string
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// LogFormat sets the format used by logs.
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LogFormat Format
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// Owner sets the compute system owner property.
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Owner string
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// Root is the registry key root for storage of runhcs container state.
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Root string
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}
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func (r *Runhcs) args() []string {
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var out []string
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if r.Debug {
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out = append(out, "--debug")
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}
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if r.Log != "" {
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// TODO: JTERRY75 - Should we do abs here?
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out = append(out, "--log", r.Log)
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}
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if r.LogFormat != none {
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out = append(out, "--log-format", string(r.LogFormat))
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}
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if r.Owner != "" {
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out = append(out, "--owner", r.Owner)
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}
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if r.Root != "" {
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out = append(out, "--root", r.Root)
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}
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return out
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}
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func (r *Runhcs) command(context context.Context, args ...string) *exec.Cmd {
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cmd := exec.CommandContext(context, command, append(r.args(), args...)...)
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cmd.Env = os.Environ()
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return cmd
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}
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// runOrError will run the provided command. If an error is
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// encountered and neither Stdout or Stderr was set the error and the
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// stderr of the command will be returned in the format of <error>:
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// <stderr>
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func (r *Runhcs) runOrError(cmd *exec.Cmd) error {
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if cmd.Stdout != nil || cmd.Stderr != nil {
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ec, err := runc.Monitor.Start(cmd)
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if err != nil {
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return err
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}
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status, err := runc.Monitor.Wait(cmd, ec)
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if err == nil && status != 0 {
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err = fmt.Errorf("%s did not terminate sucessfully", cmd.Args[0])
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}
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return err
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}
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data, err := cmdOutput(cmd, true)
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if err != nil {
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return fmt.Errorf("%s: %s", err, data)
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}
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return nil
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}
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func cmdOutput(cmd *exec.Cmd, combined bool) ([]byte, error) {
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b := getBuf()
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defer putBuf(b)
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cmd.Stdout = b
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if combined {
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cmd.Stderr = b
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}
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ec, err := runc.Monitor.Start(cmd)
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if err != nil {
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return nil, err
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}
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status, err := runc.Monitor.Wait(cmd, ec)
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if err == nil && status != 0 {
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err = fmt.Errorf("%s did not terminate sucessfully", cmd.Args[0])
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}
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return b.Bytes(), err
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}
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