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#!/usr/bin/env bash
# SPDX-License-Identifier: LGPL-2.1-or-later
set -eux
set -o pipefail
: >/failed
declare -i CHILD_PID=0
# Note: all the signal shenanigans are necessary for the Upholds= tests
# Like trap, but passes the signal name as the first argument
trap_with_sig() {
local fun="${1:?}"
local sig
shift
for sig in "$@"; do
# shellcheck disable=SC2064
trap "$fun $sig" "$sig"
done
}
# Propagate the caught signal to the current child process
handle_signal() {
local sig="${1:?}"
if [[ $CHILD_PID -gt 0 ]]; then
echo "Propagating signal $sig to child process $CHILD_PID"
kill -s "$sig" "$CHILD_PID"
fi
}
# In order to make the handle_signal() stuff above work, we have to execute
# each script asynchronously, since bash won't execute traps until the currently
# executed command finishes. This, however, introduces another issue regarding
# how bash's wait works. Quoting:
#
# When bash is waiting for an asynchronous command via the wait builtin,
# the reception of a signal for which a trap has been set will cause the wait
# builtin to return immediately with an exit status greater than 128,
# immediately after which the trap is executed.
#
# In other words - every time we propagate a signal, wait returns with
# 128+signal, so we have to wait again - repeat until the process dies.
wait_harder() {
local pid="${1:?}"
while kill -0 "$pid" &>/dev/null; do
wait "$pid" || :
done
wait "$pid"
}
trap_with_sig handle_signal SIGUSR1 SIGUSR2 SIGRTMIN+1
for script in "${0%.sh}".*.sh; do
echo "Running $script"
"./$script" &
CHILD_PID=$!
wait_harder "$CHILD_PID"
done
touch /testok
rm /failed
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