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Re: errexit does not exit script in subshells


From: Michael Potter
Subject: Re: errexit does not exit script in subshells
Date: Fri, 1 Feb 2008 21:15:22 -0600

The root 'problem' is that errexit only exits the subshell, it does
not exit the script.  I put that in quotes because under some
circumstances that is a feature.

I want the script to exit when an error is detected without any extra code.

see my other email with the "SOLUTION".  Hopefully someone will point
out a more graceful solution.

--
potter

On Feb 1, 2008 1:56 PM, Linda Walsh <address@hidden> wrote:
>
>
> Michael Potter wrote:
> > Bash Bunch,
> >
> > Not surprisingly, bash does not exit the script when an error is detected in
> > a subshell.
> >
> > I am hopeful that someone has a solution to this (other than: be careful to
> > not use subshells).
> ----
> This seems to work unless I'm missing something...
>
> #!/bin/bash
>
> set -o errexit -o noclobber -o nounset -o pipefail
>
> function traperr
> {
>     echo "TRAPERROR: ${BASH_SOURCE[0]} ${LINENO}"
>     exit 1   # does not seem to affect the program.
>     # return 1 # does not seem to affect the program.
> }
>
> set -o errtrace
> trap traperr ERR
>
> echo -n "Test one: "
> pipesave=$(set +o |grep pipefail)
> set +o pipefail
> cat /etc/passwd |while read aLine; do
>         # note: ending following 'test=' line with a "|true" will
>         # stop failure from occurring or being detected, if this is
>         # what you want..., if not, then set -o pipefile and it
>         # will 'fail' if any are false.
>          test=$(true | false | true |false)
> done
> test "$?" != 0 && exit 47
> $pipesave       # set pipesave back to original value
>
> echo -n "ONE Ok; Test two: "
>
> while read aLine; do
>
>     test=$(true | false | true |false);
> done </etc/passwd
>
> echo "TWO"
>
> test=$(true | false | true |false);
>
> echo "END"
>
> exit 0
>




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