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Fix order of processing of some xx-add/xx-rm service update flags #2668
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silvin-lubecki
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thaJeztah:fix_add_rm_handling_order
Aug 6, 2020
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Fix order of processing of some xx-add/xx-rm service update flags
Combining `-add` and `-rm` flags on `docker service update` should be usable to explicitly replace existing options. The current order of processing did not allow this, causing the `-rm` flag to remove properties that were specified in `-add`. This behavior was inconsistent with (for example) `--host-add` and `--host-rm`. This patch updates the behavior to first remove properties, then add new properties. Note that there's still some improvements to make, to make the removal more granulas (e.g. to make `--label-rm label=some-value` only remove the label if value matches `some-value`); these changes are left for a follow-up. Before this change: ----------------------------- Create a service with two env-vars ```bash docker service create --env FOO=bar --env BAR=baz --name=test nginx:alpine docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Env }}' test | jq . [ "FOO=bar", "BAR=baz" ] ``` Update the service, with the intent to replace the value of `FOO` for a new value ```bash docker service update --env-rm FOO --env-add FOO=updated-foo test docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Env }}' test | jq . [ "BAR=baz" ] ``` Create a service with two labels ```bash docker service create --label FOO=bar --label BAR=baz --name=test nginx:alpine docker service inspect --format '{{json .Spec.Labels }}' test | jq . { "BAR": "baz", "FOO": "bar" } ``` Update the service, with the intent to replace the value of `FOO` for a new value ```bash docker service update --label-rm FOO --label-add FOO=updated-foo test docker service inspect --format '{{json .Spec.Labels }}' test | jq . { "BAR": "baz" } ``` Create a service with two container labels ```bash docker service create --container-label FOO=bar --container-label BAR=baz --name=test nginx:alpine docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Labels }}' test | jq . { "BAR": "baz", "FOO": "bar" } ``` Update the service, with the intent to replace the value of `FOO` for a new value ```bash docker service update --container-label-rm FOO --container-label-add FOO=updated-foo test docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Labels }}' test | jq . { "BAR": "baz", } ``` With this patch applied: -------------------------------- Create a service with two env-vars ```bash docker service create --env FOO=bar --env BAR=baz --name=test nginx:alpine docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Env }}' test | jq . [ "FOO=bar", "BAR=baz" ] ``` Update the service, and replace the value of `FOO` for a new value ```bash docker service update --env-rm FOO --env-add FOO=updated-foo test docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Env }}' test | jq . [ "BAR=baz", "FOO=updated-foo" ] ``` Create a service with two labels ```bash docker service create --label FOO=bar --label BAR=baz --name=test nginx:alpine docker service inspect --format '{{json .Spec.Labels }}' test | jq . { "BAR": "baz", "FOO": "bar" } ``` Update the service, and replace the value of `FOO` for a new value ```bash docker service update --label-rm FOO --label-add FOO=updated-foo test docker service inspect --format '{{json .Spec.Labels }}' test | jq . { "BAR": "baz", "FOO": "updated-foo" } ``` Create a service with two container labels ```bash docker service create --container-label FOO=bar --container-label BAR=baz --name=test nginx:alpine docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Labels }}' test | jq . { "BAR": "baz", "FOO": "bar" } ``` Update the service, and replace the value of `FOO` for a new value ```bash docker service update --container-label-rm FOO --container-label-add FOO=updated-foo test docker service inspect --format '{{json .Spec.TaskTemplate.ContainerSpec.Labels }}' test | jq . { "BAR": "baz", "FOO": "updated-foo" } ``` Signed-off-by: Sebastiaan van Stijn <[email protected]>
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question: should we test field to?
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Good one, I easily get confused by these 🤔
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yeah pointer on pointer is mind blowing 😁
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I'll look for the extra check in a follow-up