[Help-bash] run-parts, trap INT, read error

[Patrick Schleizer]

Hi!

I got a strange issue run-parts in conjunction with signal sigint
handling. Difficult to describe. Therefore I post example test scripts
on how to reproduce this.

During the 'sleep', I will hit 'ctrl + c'. (You'll see this in the
output '^C'.)

----------

./parent:

#!/bin/bash

set -x

error_handler_parent() {
   true "$FUNCNAME: Exiting"
   exit 1
}

trap "error_handler_parent" ERR

main() {
   trap "error_handler_parent" ERR

   ## Issue.
   run-parts --verbose --exit-on-error ./test.d

   ## Functional.
   #./test.d/child

   true
}

main

----------

./test.d/child:

#!/bin/bash

set -x

int_test() {
   true "Enter!"
   read -p "Question..." answer
   true "answer: $answer"
}

trap "int_test" INT

sleep 60 &
wait $!

true "END"

----------

Output:

$ ./parent
+ trap error_handler_parent ERR
+ main
+ trap error_handler_parent ERR
+ run-parts --verbose --exit-on-error ./test.d
run-parts: executing ./test.d/child
+ trap int_test INT
+ wait 21061
+ sleep 60
^C++ int_test
++ true 'Enter!'
++ read -p Question... answer
Question...

[back in shell]
[press enter]

$ ./test.d/child: line 7: read: read error: 0: Input/output error
++ true 'answer: '
+ true END

-----

Where is the read error coming from?

Why is the script continuing to run in background?

If I use './test.d/child' instead of run-parts, this issue does not happen.

Cheers,
Patrick