cosmos-sdk: Wrong command output

Summary of Bug

Most of the commands print their outputs to stderr instead of stdout, making it harder to pipe with other utilities (such as jq).

Version

v0.40.1

Steps to Reproduce

1. Run almost any command (eg. simd status)
2. Try piping that command with jq

simd status | jq '.'

This will return the default output of the command, instead of the output of jq. A workaround is to redirect stderr to stdout for while running the command:

simd status 2>&1 | jq '.'

Possible solution

Taking a look at the commands code I noticed that, although many commands use the cmd.Print methods, only few correctly set their output using cmd.SetOut. This causes the cmd.Print to print the output using stderr, as per documentation:

// Println is a convenience method to Println to the defined output, fallback to Stderr if not set.

I think that a possible solution could be to add the following lines to the app.go’s initRootCmd function:

rootCmd.PersistentPreRun = func(cmd *cobra.Command, args []string) {
  cmd.SetOut(cmd.OutOrStdout())
}

This would make sure that by default all commands are set to have their output to stdout, with the ability to override it later.

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