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func (c *SetConstraintsCommand) SetFlags(f *gnuflag.FlagSet) {
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f.StringVar(&c.ServiceName, "s", "", "set service constraints")
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f.StringVar(&c.ServiceName, "service", "", "")
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func (c *SetConstraintsCommand) Init(args []string) (err error) {
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if c.ServiceName != "" && !names.IsService(c.ServiceName) {
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return fmt.Errorf("invalid service name %q", c.ServiceName)