t/self-check-shell-no-trail-bslash.sh

   1 #! /bin/sh
   2 # Copyright (C) 2012-2024 Free Software Foundation, Inc.
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2, or (at your option)
   7 # any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  16
  17 # Check that our fake "shell" used to guard against use of trailing
  18 # backslashes in recipes actually complains when those are used.
  19
  20 # Our hack doesn't work with some make implementations (see comments
  21 # in 't/ax/shell-no-trail-bslash.in' for more details).
  22 required=GNUmake
  23 am_create_testdir=empty
  24 . test-init.sh
  25
  26 cat >> Makefile <<'END'
  27 am__backslash = \\ # foo
  28 .PHONY: good bad
  29 good:
  30         @printf '%s\n' OK
  31 .PHONY: bad
  32 bad:
  33         @echo $(am__backslash)
  34 END
  35
  36 SHELL=$am_testaux_builddir/shell-no-trail-bslash
  37
  38 $SHELL -c 'exit 0'
  39 test "$($SHELL -c 'echo is  o\k')" = "is ok"
  40
  41 echo 'echo is  ok\"' > ok.sh
  42 $SHELL ./ok.sh
  43 test "$($SHELL ./ok.sh)" = "is ok\""
  44
  45 tab='   '
  46 nl='
  47 '
  48 for sfx in \
  49   '\' \
  50   '\\' \
  51   '\\\\\' \
  52   '\ ' \
  53   "\\$tab" \
  54   "\\ $tab$tab   " \
  55   "\\$nl" \
  56   "\\ $nl " \
  57   "\\$nl$nl$nl" \
  58 ; do
  59   for pfx in "" "echo bad" ": a${nl}# multine${nl}: text"; do
  60     cmd=${pfx}${sfx}
  61     printf '%s' "$cmd" > bad.sh
  62     for args in '-c "$cmd"' './bad.sh'; do
  63       eval "\$SHELL $args 2>stderr && { cat stderr >&2; exit 1; }; :"
  64       cat stderr >&2
  65       $FGREP "recipe/script ends with backslash character" stderr
  66       cmd="$cmd" $PERL -w -e '
  67         undef $/;
  68         $_ = <>;
  69         index($_, $ENV{cmd}) >= 0 or exit 1;
  70       ' <stderr
  71       $FGREP "$cmd" stderr
  72     done
  73   done
  74 done
  75
  76 $MAKE good
  77
  78 run_make -E -e FAIL bad SHELL="$SHELL"
  79 $FGREP "recipe/script ends with backslash character" stderr
  80
  81 :