Test traps, errexit, errtrace

gistfile1.sh

#!/bin/bash

# Do some errexit testing

# 0 - test success
# 1 - test simple fail
# 2 - test function fail
#
# in function
# N   errexit   errtrace   pass?
# 2     Y          N        Y
# 3     Y          Y        Y
# 4     N          N        N
# 5     N          Y        Y

# in subshell
# N   errexit   errtrace   pass?
# 6     Y          N        Y
# 7     Y          Y        Y
# 8     N          N        Y
# 9     N          Y        Y

# Make a scenario selection
N=${1:-0}

FALSE=./false.sh

set -o errexit
set -o xtrace

# Set up traps like stack.sh does

trap exit_trap EXIT
function exit_trap {
    local r=$?
    if [[ $r -ne 0 ]]; then
        echo "Error on exit"
    fi
    echo "Leaving exit_trap: $r"
    exit $r
}

trap err_trap ERR
function err_trap {
    local r=$?
    set +o xtrace
    echo "Leaving err_trap: $r"
    exit $r
}

fail_function() {
    false
    echo "Should never be displayed"
}

case $N in
    0)  # simple success
        true
        ;;

    1)  # simple top-level error
        false
        ;;

    2)  # fail in function
        fail_function
        echo "FAIL"
        ;;

    3)  # fail in function with -E
        set -o errtrace
        fail_function
        echo "FAIL"
        ;;

    4)  # fail in function without errexit
        set +o errexit
        fail_function
        echo "FAIL"
        ;;

    5)  # fail in function with -E without errexit
        set +o errexit
        set -o errtrace
        fail_function
        echo "FAIL"
        ;;

    6)  # fail in subshell
        bash -c ${FALSE}
        echo "FAIL"
        ;;

    7)  # fail in subshell with -E
        set -o errtrace
        bash -c ${FALSE}
        echo "FAIL"
        ;;

    8)  # fail in subshell without errexit
        set +o errexit
        bash -c ${FALSE}
        echo "FAIL"
        ;;

    9)  # fail in subshell with -E without errexit
        set +o errexit
        set -o errtrace
        bash -c ${FALSE}
        echo "FAIL"
        ;;
esac

# Record reaching the end of the script
echo "Fini"

gistfile2.sh

#!/bin/bash
# not strictly necessary as bash -c false has same effect
false

gistfile3.txt

for i in `seq 0 9`; do echo "N=$i"; ./test-errexit $i; done