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rkt: skip parsing in case of an empty string #3822
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When any string in []args is empty, "", then the `al.Count()` gets still incremented, even if there's nothing to parse. As a result, `rkt app add` fails with an error message like `must give only one app`, even when only one app name is given. For example, rktlet runs the following command: ``` rkt app --insecure-options=image,ondisk add 58992c0a-540d-40a4-bf39-4bb193d74f94 \ docker://busybox:1.26 --name=2-seccomp-container-docker-default-d25eafce-ad02-11e7-a670-2eecc98c9398d25eaff2-ad02-11e7-a670-2eecc98c9398 \ --user-annotation=k8s.io/reserved/image-name=busybox:1.26 --exec=top ``` Then the last part, " --exec=top" is parsed a list of 2 separate strings: " " and "--exec=top", That's why `al.Count()` becomes 2. See also kubernetes-retired/rktlet#146 (comment)
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When any string in
[]argsis empty,"", then theal.Count()gets still incremented, even if there's nothing to parse. As a result,rkt app addfails with an error message likemust give only one app, even when only one app name is given.For example, rktlet runs the following command:
Then the last part,
" --exec=top"is parsed to a list of 2 separate strings:" "and"--exec=top", That's whyal.Count()becomes 2.See also kubernetes-retired/rktlet#146 (comment)