Improve --json behaviour with interactive prompts

[GrahamDumpleton]

What steps did you take:

Create an example.yaml file containing:

apiVersion: v1
kind: ConfigMap
metadata:
  name: xxx
data:
  xyz: abc

Run:

kapp deploy -a website -f example.yaml --json

What happened:

It appeared to crash and generate a Golang stack trace.

{
    "Tables": [
        {
            "Content": "",
            "Header": {
                "age": "Age",
                "conditions": "Conds.",
                "kind": "Kind",
                "name": "Name",
                "namespace": "Namespace",
                "op": "Op",
                "op_strategy": "Op st.",
                "reconcile_info": "Ri",
                "reconcile_state": "Rs",
                "wait_to": "Wait to"
            },
            "Rows": [
                {
                    "age": "",
                    "conditions": "",
                    "kind": "ConfigMap",
                    "name": "xxx",
                    "namespace": "lab-carvel-ytt-01-w01-s002",
                    "op": "create",
                    "op_strategy": "",
                    "reconcile_info": "",
                    "reconcile_state": "",
                    "wait_to": "reconcile"
                }
            ],
            "Notes": [
                "Op:      1 create, 0 delete, 0 update, 0 noop",
                "Wait to: 1 reconcile, 0 delete, 0 noop"
            ]
        }
    ],
    "Blocks": null,
    "Lines": [
        "Target cluster 'https://10.96.0.1:443'"
    ]
}panic: Cannot ask for confirmation in JSON UI

goroutine 1 [running]:
github.com/cppforlife/go-cli-ui/ui.(*JSONUI).AskForConfirmation(0xc0003daa00, 0x1535358, 0xc000cad1d0)
        github.com/cppforlife/[email protected]/ui/json_ui.go:114 +0x39
github.com/cppforlife/go-cli-ui/ui.(*ConfUI).AskForConfirmation(0xc0003ebd80, 0xc0001be140, 0xc0000791a0)
        github.com/cppforlife/[email protected]/ui/conf_ui.go:105 +0x33
github.com/k14s/kapp/pkg/kapp/cmd/app.(*DeployOptions).Run(0xc00012cc80, 0x0, 0x0)
        github.com/k14s/kapp/pkg/kapp/cmd/app/deploy.go:171 +0xc8f
github.com/k14s/kapp/pkg/kapp/cmd/app.NewDeployCmd.func1(0xc00013f340, 0xc00007df90, 0x0, 0x5, 0xc000374580, 0x1527ef0)
        github.com/k14s/kapp/pkg/kapp/cmd/app/deploy.go:54 +0x2a
github.com/k14s/kapp/pkg/kapp/cmd.NewKappCmd.func1.1(0xc00013f340, 0xc00007df90, 0x0, 0x5, 0x0, 0x0)
        github.com/k14s/kapp/pkg/kapp/cmd/kapp.go:126 +0xb8
github.com/cppforlife/cobrautil.WrapRunEForCmd.func1.1(0xc00013f340, 0xc00007df90, 0x0, 0x5, 0x0, 0x0)
        github.com/cppforlife/[email protected]/misc.go:45 +0xb2
github.com/cppforlife/cobrautil.WrapRunEForCmd.func1.1(0xc00013f340, 0xc00007df90, 0x0, 0x5, 0x0, 0x0)
        github.com/cppforlife/[email protected]/misc.go:45 +0xb2
github.com/cppforlife/cobrautil.WrapRunEForCmd.func1.1(0xc00013f340, 0xc00007df90, 0x0, 0x5, 0x0, 0x0)
        github.com/cppforlife/[email protected]/misc.go:45 +0xb2
github.com/spf13/cobra.(*Command).execute(0xc00013f340, 0xc00007df40, 0x5, 0x5, 0xc00013f340, 0xc00007df40)
        github.com/spf13/[email protected]/command.go:850 +0x472
github.com/spf13/cobra.(*Command).ExecuteC(0xc00013e580, 0xc00013e580, 0xc0003ebd80, 0x7f73f8ce0108)
        github.com/spf13/[email protected]/command.go:958 +0x375
github.com/spf13/cobra.(*Command).Execute(...)
        github.com/spf13/[email protected]/command.go:895
main.nonExitingMain(0x0, 0x0)
        github.com/k14s/kapp/cmd/kapp/kapp.go:42 +0x167
main.main()
        github.com/k14s/kapp/cmd/kapp/kapp.go:21 +0x26

What did you expect:

Am not sure. I was trying to work out what the --json option actually did when it occurred, so not sure if this is expected and normal, but it sort of looks wrong.

Anything else you would like to add:

Nope.

Environment:

$ kapp --version
kapp version 0.37.0

---

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cc @jorgemoralespou

[cppforlife]

--json is incompatible with interactive UI (that's what this error is trying to message panic: Cannot ask for confirmation in JSON UI). you either have to use -y for the full deploy or --diff-run since it ends before confirmation prompt pops in.

[jorgemoralespou]

If the flags are incompatible, or -y is required, the correct thing to do is to show that message and not a json rendered output and a panic.

Cannot ask for confirmation in JSON UI. Either use `-y` flag or remove `--json` format

This should be the only output. It should not even try to deploy and fail.

[renuy]

We may have look at making changes generically in the library used: https://github.com/cppforlife/go-cli-ui