fix: prevent change in defaults if user unsets in template edit (#10793)

* fix: template edit not change defaults if user unset

cli/util.go

@@ -8,6 +8,7 @@ import (
 
 	"golang.org/x/xerrors"
 
+	"github.com/coder/coder/v2/cli/clibase"
 	"github.com/coder/coder/v2/coderd/schedule/cron"
 	"github.com/coder/coder/v2/coderd/util/tz"
 )
@@ -18,6 +19,19 @@ var (
 	errUnsupportedTimezone   = xerrors.New("The location you provided looks like a timezone. Check https://ipinfo.io for your location.")
 )
 
+// userSetOption returns true if the option was set by the user.
+// This is helpful if the zero value of a flag is meaningful, and you need
+// to distinguish between the user setting the flag to the zero value and
+// the user not setting the flag at all.
+func userSetOption(inv *clibase.Invocation, flagName string) bool {
+	for _, opt := range inv.Command.Options {
+		if opt.Name == flagName {
+			return !(opt.ValueSource == clibase.ValueSourceNone || opt.ValueSource == clibase.ValueSourceDefault)
+		}
+	}
+	return false
+}
+
 // durationDisplay formats a duration for easier display:
 //   - Durations of 24 hours or greater are displays as Xd
 //   - Durations less than 1 minute are displayed as <1m