cmd/sync-containers: add a dry-run option.
Updates tailscale/corp#8461
src = flag.String("src", "", "Source image")
dst = flag.String("dst", "", "Destination image")
max = flag.Int("max", 0, "Maximum number of tags to sync (0 for all tags)")
+ dryRun = flag.Bool("dry-run", true, "Don't actually sync anything")
)
func main() {
@@ -69,10 +70,14 @@ func main() {
}
}
for _, tag := range add {
+ if !*dryRun {
log.Printf("Syncing tag %q", tag)
if err := copyTag(*src, *dst, tag, opts...); err != nil {
log.Printf("Syncing tag %q: progress error: %v", tag, err)
}
+ } else {
+ log.Printf("Dry run: would sync tag %q", tag)
+ }
}
if len(remove) > 0 {
