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# GNU Shepherd --- Test logging behavior when failing to write log file.
# Copyright © 2025 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of the GNU Shepherd.
#
# The GNU Shepherd is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or (at
# your option) any later version.
#
# The GNU Shepherd is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the GNU Shepherd. If not, see <https://www.gnu.org/licenses/>.
shepherd --version
herd --version
log_directory="$PWD/t-log-directory-$$"
socket="t-socket-$$"
conf="t-conf-$$"
log="t-log-$$"
pid="t-pid-$$"
service_pid="$PWD/t-service-pid-$$"
herd="herd -s $socket"
trap "cat $log || true; rm -f $log $socket $conf $pid $service_pid; rm -rf $log_directory;
kill \$main_pid || true" EXIT
cat > "$conf"<<EOF
(register-services
(list (service
'(log-directory-does-not-exist)
#:start (make-forkexec-constructor
'("$SHELL" "-c" "while true; do echo logging; sleep 0.2; done")
#:log-file "$log_directory/service.log")
#:stop (make-kill-destructor))
(service
'(log-directory-not-writable)
#:start (make-forkexec-constructor
'("$SHELL" "-c" "echo \$\$ > $service_pid; while true; do echo trying to log; sleep 0.2; done")
#:log-file "$log_directory/read-only/seriously?.log")
#:stop (make-kill-destructor))))
EOF
rm -f "$pid"
shepherd -I -s "$socket" -c "$conf" -l "$log" --pid="$pid" &
main_pid=$!
# Wait till it's ready.
until test -f "$pid" ; do sleep 0.3 ; done
$herd status
# "$log_directory" does not and should be automatically created.
test -f "$log_directory" && false
$herd start log-directory-does-not-exist
$herd status log-directory-does-not-exist | grep running
$herd status log-directory-does-not-exist | grep "$log_directory/service.log"
grep logging "$log_directory/service.log"
# If the log file cannot be created at all, the service fails to start.
mkdir -m 0555 "$log_directory/read-only"
$herd start log-directory-not-writable && false
$herd status log-directory-not-writable | grep stopped
grep "Failed to open log file .* for log-directory-not-writable" "$log"
# It's possible that the process for 'log-directory-not-writable' started and
# wrote its PID before the logger was created (and failed). If it did, check
# whether that process terminated.
if test -s "$service_pid"
then
while kill -0 "$(cat "$service_pid")"; do sleep 0.3; done
fi
$herd status
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