Fail build in Go when custom command fails

Question

I'm using Go's custom command to execute a shell script. The problem is, if the script fails for any reason, the build still succeeds. How do I fail the build if something goes wrong in my shell script?

Answer 1

Arrange the logic in your script so that if the script fails it exits with an exit code >= 1

#!/bin/bash
N=0
#do your logic here and increment N for each failure.
ls /non/existent/dir || { 
    echo "can't ls /non/existent/dir"
    N=$((N+1))
}
#do something else
echo "we had $N errors"
exit N

alternatively if you want to fail fast

#!/bin/bash
ls /non/existent/dir || { 
    echo "can't ls /non/existent/dir"
    exit 1
}

For each shell cmd you can see the exit code with...

 echo $?