cli: sequence cli.Ui operations #6865
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Fixes a bug where if a command flag parsing errors, the resulting error and help usage messages get interleaved in unexpected and non-user friendly way. The reason is that we have flag parsing library effectively writes to ui.Error in a goroutine. This is problematic: first, we lose the sequencing between help usage and error message; second, cli.Ui methods are not concurrent safe. Here, we introduce a custom error writer that buffers result and calls ui.Error() in the write method and in the same goroutine. For context, we need to wrap ui.Error because it's line-oriented, while flags library expects a io.Writer which is bytes oriented.
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Fixes a bug where if a command flag parsing errors, the resulting error
and help usage messages get interleaved in unexpected and non-user
friendly way.
The reason is that we have flag parsing library effectively writes to
ui.Error in a goroutine. This is problematic: first, we lose the sequencing between help
usage and error message; second, cli.Ui methods are not concurrent safe.
Here, we introduce a custom error writer that buffers result and calls
ui.Error() in the write method and in the same goroutine.
For context, we need to wrap ui.Error because it's line-oriented, while
flags library expects a io.Writer which is bytes oriented.
Fixes #6857