52 lines
1.3 KiB
Go
52 lines
1.3 KiB
Go
// +build !windows
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package googlecompute
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import (
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"context"
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"log"
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"os/exec"
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"syscall"
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)
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func NewTunnelDriver() TunnelDriver {
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return &TunnelDriverLinux{}
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}
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type TunnelDriverLinux struct {
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cmd *exec.Cmd
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}
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func (t *TunnelDriverLinux) StartTunnel(cancelCtx context.Context, tempScriptFileName string) error {
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cmd := exec.CommandContext(cancelCtx, tempScriptFileName)
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cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
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err := RunTunnelCommand(cmd)
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if err != nil {
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return err
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}
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// Store successful command on step so we can access it to cancel it
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// later.
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t.cmd = cmd
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return nil
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}
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func (t *TunnelDriverLinux) StopTunnel() {
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if t.cmd != nil && t.cmd.Process != nil {
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log.Printf("Cleaning up the IAP tunnel...")
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// Why not just cmd.Process.Kill()? I'm glad you asked. The gcloud
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// call spawns a python subprocess that listens on the port, and you
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// need to use the process _group_ id to halt this process and its
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// daemon child. We create the group ID with the syscall.SysProcAttr
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// call inside the retry loop above, and then store that ID on the
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// command so we can halt it here.
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err := syscall.Kill(-t.cmd.Process.Pid, syscall.SIGINT)
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if err != nil {
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log.Printf("Issue stopping IAP tunnel: %s", err)
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}
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} else {
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log.Printf("Couldn't find IAP tunnel process to kill. Continuing.")
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}
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}
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