Fix error output in JSON mode - #600
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Write fatal errors directly to stderr when JSON output is enabled so os.Exit does not discard the buffered message. Keep stdout empty and preserve the configured UI for non-JSON errors. Add a subprocess regression test covering streams and exit status. Fixes carvel-dev#455 Signed-off-by: snowyukitty <270071858+snowyukitty@users.noreply.github.com>
joaopapereira
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Aug 13, 2026
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I am going to allow the tests to run, nevertheless I left a comment but in general the code looks ok
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Signed-off-by: snowyukitty <270071858+snowyukitty@users.noreply.github.com>
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Fixes #455.
When
--jsonis enabled, fatal errors are buffered by the JSON UI. The process then callsos.Exit(1), which skips the deferred flush and leaves users with a non-zero exit code but no diagnostic. Flushing the buffer on this path would put the error on stdout, while JSON failures are expected to keep stdout empty and report a plain-text error on stderr.This change keeps the parsed UI options available in
mainand bypasses the buffered UI only for JSON-mode failures. Non-JSON errors still use the configured UI, preserving color and TTY behavior; successful JSON output is unchanged.An end-to-end regression test verifies exit code 1, empty stdout, and a plain-text stderr diagnostic.