packer-cn/command/signal.go

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package command
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
packersdk "github.com/hashicorp/packer/packer-plugin-sdk/packer"
)
func handleTermInterrupt(ui packersdk.Ui) (context.Context, func()) {
ctx, cancelCtx := context.WithCancel(context.Background())
// Handle interrupts for this build
sigCh := make(chan os.Signal, 1)
signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
cleanup := func() {
cancelCtx()
signal.Stop(sigCh)
close(sigCh)
}
go func() {
select {
case sig := <-sigCh:
if sig == nil {
// context got cancelled and this closed chan probably
// triggered first
return
}
ui.Error(fmt.Sprintf("Cancelling build after receiving %s", sig))
cancelCtx()
case <-ctx.Done():
}
}()
return ctx, cleanup
}