67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
|
package plugin
|
||
|
|
|
||
|
|
import (
|
||
|
|
"github.com/mitchellh/packer/packer"
|
||
|
|
packrpc "github.com/mitchellh/packer/packer/rpc"
|
||
|
|
"log"
|
||
|
|
"net/rpc"
|
||
|
|
"os/exec"
|
||
|
|
)
|
||
|
|
|
||
|
|
type cmdHook struct {
|
||
|
|
hook packer.Hook
|
||
|
|
client *client
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *cmdHook) Run(name string, data interface{}, ui packer.Ui) {
|
||
|
|
defer func() {
|
||
|
|
r := recover()
|
||
|
|
c.checkExit(r, nil)
|
||
|
|
}()
|
||
|
|
|
||
|
|
c.hook.Run(name, data, ui)
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *cmdHook) checkExit(p interface{}, cb func()) {
|
||
|
|
if c.client.Exited() {
|
||
|
|
cb()
|
||
|
|
} else if p != nil {
|
||
|
|
log.Panic(p)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns a valid packer.Hook where the hook is executed via RPC
|
||
|
|
// to a plugin that is within a subprocess.
|
||
|
|
//
|
||
|
|
// This method will start the given exec.Cmd, which should point to
|
||
|
|
// the plugin binary to execute. Some configuration will be done to
|
||
|
|
// the command, such as overriding Stdout and some environmental variables.
|
||
|
|
//
|
||
|
|
// This function guarantees the subprocess will end in a timely manner.
|
||
|
|
func Hook(cmd *exec.Cmd) (result packer.Hook, err error) {
|
||
|
|
cmdClient := NewManagedClient(cmd)
|
||
|
|
address, err := cmdClient.Start()
|
||
|
|
if err != nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
defer func() {
|
||
|
|
// Make sure the command is properly killed in the case of an error
|
||
|
|
if err != nil {
|
||
|
|
cmdClient.Kill()
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
|
||
|
|
client, err := rpc.Dial("tcp", address)
|
||
|
|
if err != nil {
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
result = &cmdHook{
|
||
|
|
packrpc.Hook(client),
|
||
|
|
cmdClient,
|
||
|
|
}
|
||
|
|
|
||
|
|
return
|
||
|
|
}
|