exec.Command does not register error from Go's own pprof tool -


here code:

cmd := exec.command("go", "tool", "pprof", "-dot", "-lines", "http://google.com") out, err := cmd.output() if err != nil {     panic(err) } println(string(out))

when run exact same command in console, see:

$ go tool pprof -dot -lines http://google.com  fetching profile http://google.com/profilez please wait... (30s) server response: 404 not found

however, go program not register error. oddly, variable out prints empty string , err nil. going on?

to clarify, profiling http://google.com purposefully create error. profile real go application.

the text 

fetching profile http://google.com/profilez please wait... (30s) server response: 404 not found

is written stderr. program captures stdout, empty. consider calling:

out, err := cmd.combinedoutput()

to grab both stdout , stderr.

cmd.output() , cmd.combinedoutput() return err == nil because command exits status zero. perhaps issue should filed requesting command exit non-zero status.


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