#! /bin/sh
# Copyright (C) 2011-2012 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/>.

# Sanity check for the automake testsuite.
# Check that automatic re-execution of test script with the
# configure-time $AM_TEST_RUNNER_SHELL.

am_create_testdir=empty
. ./defs || exit 1

plan_ 32

unset AM_TESTS_REEXEC BASH_VERSION || :

cwd=$(pwd) || fatal_ "getting current working directory"
cp "$am_top_builddir"/defs . || fatal_ "fetching 'defs' from top_builddir"

#
# Search for required bash and non-bash shells.
#

for bash_shell in \
  "$SHELL" "$AM_TEST_RUNNER_SHELL" bash bash3 bash4 :
do
  test "$bash_shell" = : && break
  $bash_shell --version || continue
  $bash_shell -c 'test -n "$BASH_VERSION"' || continue
  break
done

# This might not be optimal, but it's much better than writing wrapper
# scripts acting as "fake" shells.
for non_bash_shell in \
  /bin/sh /bin/ksh sh ksh ash dash pdksh "$SHELL" "$AM_TEST_RUNNER_SHELL" :
do
  test "$non_bash_shell" = : && break
  $non_bash_shell -c 'exit 0' || continue
  # Be sure to reject also any shell that is Zsh "in disguise" (as can
  # be found on some Debian systems, where /bin/ksh can be symlinked to
  # /bin/zsh4).  This is required because our testsuite does not support
  # older versions of Zsh, and that has caused spurious failures in the
  # past.
  $non_bash_shell -c 'test -n "$ZSH_VERSION$BASH_VERSION"' && continue
  break
done

echo "bash_shell='$bash_shell'"
echo "non_bash_shell='$non_bash_shell'"

# This would denote an internal error.
if test "$bash_shell" = : && test "$non_bash_shell" = :; then
  fatal_ "we couldn't find a bash shell nor a non-bash one"
fi

#
# Functions used throughout the test.
#

get_ddata ()
{
  case $1 in
    ""|*/) dsep=;;
        *) dsep=/;;
  esac
  case $1 in
    "") dname="no dir";;
    /*) dname="absolute dir";;
     *) dname="dir '$1'";;
  esac
}

get_sh ()
{
  case $1 in
    bash) sh=$bash_shell;;
    non-bash) sh=$non_bash_shell;;
    *) fatal_ "get_sh: invalid shell type '$1'";;
  esac
}

#
# Check how to default, force or prevent a re-execution.
#

cat > need-bash.sh <<'END'
#!/bin/false
. ./defs
# Ensure that the script gets re-executed with bash.  Also ensure that
# non-standard syntax used after the inclusion of './defs' doesn't cause
# non-bash shells to fail.
# Subshell required to prevent some shells (e.g., Solaris 10 /bin/sh)
# from only complaining on stderr but then exiting with exit status 0.
(foo=abac && test xbxc = ${foo//a/x} && test -n "$BASH_VERSION")
END

sh_var=AM_TEST_RUNNER_SHELL
sed -e "s|^am_top_builddir=.*|am_top_builddir='$cwd'|" \
    -e "s|^$sh_var=.*$|$sh_var=bash; export $sh_var|" \
    < "$am_top_builddir"/defs-static >defs-static

do_reexec ()
{
  command_ok_ "re-exec if AM_TESTS_REEXEC=$1" \
              env AM_TESTS_REEXEC="$1" $non_bash_shell need-bash.sh
}

dont_reexec ()
{
  command_ok_ "don't re-exec if AM_TESTS_REEXEC=$1" \
              not env AM_TESTS_REEXEC="$1" $non_bash_shell need-bash.sh
}

if test "$bash_shell" = :; then
  skip_row_ 10 -r "no bash shell found" AM_TESTS_REEXEC
elif test "$non_bash_shell" = :; then
  skip_row_ 10 -r "no non-bash shell found" AM_TESTS_REEXEC
else
  command_ok_ "re-exec if AM_TESTS_REEXEC unset" \
              $non_bash_shell need-bash.sh
  do_reexec ''
  do_reexec yes
  do_reexec y
  do_reexec true
  do_reexec 1
  dont_reexec no
  dont_reexec n
  dont_reexec false
  dont_reexec 0
fi

#
# Check message about the re-execution.  Also check that arguments passed
# to a test script are preserved by a re-exec, even in "corner" cases.
#

cat > dummy.sh <<'END'
#!/bin/sh
. ./defs
:
END

cat > checkargs.sh <<'END'
. ./defs
test $# -eq 3 && test x"$1" = x'a' && test x"$2" = x && test x"$3" = x"-e"
END

chmod a+x dummy.sh checkargs.sh

mkdir sub
cp dummy.sh checkargs.sh defs sub
sed -e "s|^am_top_builddir=.*|am_top_builddir='$cwd'|" \
    <  "$am_top_builddir"/defs-static > defs-static
sed -e "s|^am_top_builddir=.*|am_top_builddir='$cwd/sub'|" \
    <  "$am_top_builddir"/defs-static > sub/defs-static

check_preserve_args ()
{
  dir=$1; shift
  get_ddata "$dir"
  $sh "${dir}${dsep}checkargs.sh" a '' -e && r='ok' || r='not ok'
  result_ "$r" "$sh re-exec preserving args [$dname]"
}

check_reexec_message ()
{
  dir=$1; shift
  get_ddata "$dir"
  $sh "${dir}${dsep}dummy.sh" "$@" \
    | grep "^exec $AM_TEST_RUNNER_SHELL ${dir}${dsep}dummy\\.sh $*\$" \
    && r='ok' || r='not ok'
  result_ "$r" "$sh display re-exec message [$dname] [args: $*]"
}

./dummy.sh a b \
  | grep "^exec $AM_TEST_RUNNER_SHELL \\./dummy\\.sh a b$" \
  && r='ok' || r='not ok'
result_ "$r" "direct run display re-exec message [args: a b]"

./checkargs.sh a '' -e && r='ok' || r='not ok'
result_ "$r" "direct re-exec preserving args"

for sh_type in non-bash bash; do
  get_sh $sh_type
  if test "$sh" = :; then
    skip_row_ 5 -r "no $sh_type shell available" "re-exec message"
    skip_row_ 5 -r "no $sh_type shell available" "re-exec preserving args"
    continue
  fi
  check_preserve_args ''
  check_reexec_message '' a b c
  check_preserve_args .
  check_reexec_message .  a b c
  cd sub
  check_preserve_args ..
  check_reexec_message .. a b c
  cd ..
  check_preserve_args "$cwd"
  check_reexec_message "$cwd" a -b c-
  check_preserve_args sub
  check_reexec_message sub 1 2 3 4
done

: