Phillipp
System.stop(1) does not return code to shell
Hey,
I am developing an escript and want to return the code 1 to the shell in case of an error, so if my tool gets automated, the automation scripts can detect an error based on the returned code.
So, to keep it simply, we return right from the main function of my escript entrypoint module:
def main(_args) do
System.stop(1)
end
Then after I run my generated escript:
$ echo $?
0
Am I right that there should be a 1 instead of a 0?
Most Liked
josevalim
Usually it is fine for escripts and sometimes even desired for faster shutdown. The difference is that System.halt() does not shutdown the applications supervision trees one by one. It just halts the system.
elbrujohalcon
I tried with…
defmodule Excript.CLI do
def main(args \\ []) do
{opts, _, _} = OptionParser.parse(args, switches: [halt: :boolean])
if opts[:halt], do: System.halt(1), else: System.stop(1)
end
end
…and could definitely reproduce the error, see:
$ ./excript --halt
$ echo $?
1
$ ./excript
$ echo $?
0
As @Phillipp says… it’s an issue with erlang escripts.
Last Post!
OvermindDL1
You can always manually shut down parts that need to be shut down cleanly before calling it though (just don’t shut down the kernel before you get a chance to call halt). 
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