#! /bin/sh
# Copyright (C) 2011-2013 Free Software Foundation, Inc.
#
# This program 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 2, or (at your option)
# any later version.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

# Check that the parallel testsuite harness removes incomplete log files
# when interrupt upon some signal.  This test is definitely too hacky,
# but we couldn't find a better way to deal with inter-processes
# signals and the whole process-synchronization mess.

. test-init.sh

plan_ 16

cat >> configure.ac << 'END'
AC_OUTPUT
END

cat > Makefile.am << 'END'
TESTS = foo.test
## Provide more debugging info.
TEST_LOG_COMPILER = $(SHELL) -ex
## Required by foo.test; see below.
AM_TESTS_FD_REDIRECT = 9>&1
END

# This is hacky and ugly, but has the great advantage of avoiding us a lot
# of pain with background processes and related synchronization issues.

cat - "$am_scriptdir"/test-driver > test-driver <<'END'
#!/bin/sh
echo $$ > pid
END

cat > foo.test << 'END'
#!/bin/sh -e

# We expect the test driver to be terminated by a signal, and so
# to exit with non-zero status, thus causing "make check" to fail.
# Exiting with status 0 from this test script is thus a good way to
# make unexpected behaviours more evident, since this will likely
# cause and unexpected success in "make check".
trap 'exit 0' 0;
stop_test () { exit 0; }

# We need the "foo is starting to run" string flushed to standard output
# ASAP, because we are soon going to grep for that string in the log file
# where the test driver is redirecting this script's stdout.  The safest
# way force this flushing portably is to rely on perl I/O capabilities.
$PERL -e 'BEGIN { $| = 1 }; print "foo is starting to run\n"' || stop_test

ls -l >&9 || stop_test

bailout ()
{
  # Print this to the original stdout (saved in the fd 9), so that the
  # emitted "Bail out!" directive will be interpreted by the test driver
  # running the Automake testsuite.
  echo "Bail out! $*" >&9
  stop_test
}

test $sig -gt 0 || bailout "\$sig not exported to test script"

res=ok; cat foo.log >&9 || res="not ok"
echo "$res - logfile created and readable [SIG $sig]" >&9

res=ok; grep '^foo is starting to run$' foo.log >&9 || res='not ok'
echo "$res - logfile contains output from test script [SIG $sig]" >&9

cat pid >&9 || bailout "cannot get PID of test driver"
kill -$sig `cat pid` || bailout "cannot send signal $sig to test driver"

stop_test
END
chmod a+x foo.test

$ACLOCAL  || fatal_ "aclocal failed"
$AUTOCONF || fatal_ "autoconf failed"
$AUTOMAKE || fatal_ "automake failed"

./configure || fatal_ "./configure failed"

# The only signals that can be trapped portable are 1 "SIGHUP",
# 2 "SIGINT", 13 "SIGPIPE" and 15 "SIGTERM".
trapped_signals='1 2 13 15'

for sig in $trapped_signals; do
  if is_blocked_signal $sig; then
    for i in 1 2 3 4; do echo "ok # SKIP signal $sig is blocked"; done
    continue
  fi
  rm -f pid fail *.log
  r=ok; env PERL="$PERL" sig="$sig" $MAKE check && r='not ok'
  echo "$r - signal $sig to test driver causes \"make check\" to fail"
  ls -l
  # These files shouldn't exist, but in case they do, their content might
  # provide helpful information about the causes of the failure(s).
  cat foo.log || :
  cat test-suite.log || :
  r=ok; ls | $EGREP 'foo.*\.(log|tmp)' && r='not ok'
  echo "$r - test driver clean up log and tmp files after signal $sig"
done

: