Check for StateCancelled

builder/proxmox/builder.go

@@ -3,6 +3,7 @@ package proxmox
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 
 	"github.com/Telmate/proxmox-api-go/proxmox"
@@ -89,7 +90,12 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 	if rawErr, ok := state.GetOk("error"); ok {
 		return nil, rawErr.(error)
 	}
+	// If we were interrupted or cancelled, then just exit.
+	if _, ok := state.GetOk(multistep.StateCancelled); ok {
+		return nil, errors.New("build was cancelled")
+	}
 
+	// Verify that the template_id was set properly, otherwise we didn't progress through the last step
 	tplID, ok := state.Get("template_id").(int)
 	if !ok {
 		return nil, fmt.Errorf("template ID could not be determined")