tests/bin/sh/t_set_e.sh

   1 # $NetBSD: t_set_e.sh,v 1.1 2012/03/17 16:33:11 jruoho Exp $
   2 #
   3 # Copyright (c) 2007 The NetBSD Foundation, Inc.
   4 # All rights reserved.
   5 #
   6 # Redistribution and use in source and binary forms, with or without
   7 # modification, are permitted provided that the following conditions
   8 # are met:
   9 # 1. Redistributions of source code must retain the above copyright
  10 #    notice, this list of conditions and the following disclaimer.
  11 # 2. Redistributions in binary form must reproduce the above copyright
  12 #    notice, this list of conditions and the following disclaimer in the
  13 #    documentation and/or other materials provided with the distribution.
  14 #
  15 # THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  16 # ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18 # PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  19 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  20 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  21 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  23 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  25 # POSSIBILITY OF SUCH DAMAGE.
  26 #
  27
  28 # references:
  29 #   http://www.opengroup.org/onlinepubs/009695399/utilities/set.html
  30 #   http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
  31
  32 # the implementation of "sh" to test
  33 : ${TEST_SH:="sh"}
  34
  35 failwith()
  36 {
  37         case "$SH_FAILS" in
  38                 "") SH_FAILS=`echo "$1"`;;
  39                 *) SH_FAILS="$SH_FAILS"`echo; echo "$1"`;;
  40         esac
  41 }
  42
  43 check1()
  44 {
  45         #echo "$TEST_SH -c $1"
  46         result=`$TEST_SH -c "$1" 2>/dev/null | tr '\n' ' ' | sed 's/ *$//'`
  47         if [ "$result" != "$2" ]; then
  48                 MSG=`printf "%-56s %-8s  %s" "$3" "$result" "$2"`
  49                 failwith "$MSG"
  50                 failcount=`expr $failcount + 1`
  51         fi
  52         count=`expr $count + 1`
  53 }
  54
  55 # direct check: try the given expression.
  56 dcheck()
  57 {
  58         check1 "$1" "$2" "$1"
  59 }
  60
  61 # eval check: indirect through eval.
  62 # as of this writing, this changes the behavior pretty drastically and
  63 # is thus important to test. (PR bin/29861)
  64 echeck()
  65 {
  66         check1 'eval '"'($1)'" "$2" "eval '($1)'"
  67 }
  68
  69 atf_test_case all
  70 all_head() {
  71         atf_set "descr" "Tests that 'set -e' works correctly"
  72 }
  73 all_body() {
  74         count=0
  75         failcount=0
  76
  77         # make sure exiting from a subshell behaves as expected
  78         dcheck '(set -e; exit 1; echo ERR$?); echo OK$?' 'OK1'
  79         echeck '(set -e; exit 1; echo ERR$?); echo OK$?' 'OK1'
  80
  81         # first, check basic functioning.
  82         # The ERR shouldn't print; the result of the () should be 1.
  83         # Henceforth we'll assume that we don't need to check $?.
  84         dcheck '(set -e; false; echo ERR$?); echo -n OK$?' 'OK1'
  85         echeck '(set -e; false; echo ERR$?); echo -n OK$?' 'OK1'
  86
  87         # these cases should be equivalent to the preceding.
  88         dcheck '(set -e; /nonexistent; echo ERR); echo OK' 'OK'
  89         echeck '(set -e; /nonexistent; echo ERR); echo OK' 'OK'
  90         dcheck '(set -e; nonexistent-program-on-path; echo ERR); echo OK' 'OK'
  91         echeck '(set -e; nonexistent-program-on-path; echo ERR); echo OK' 'OK'
  92         dcheck 'f() { false; }; (set -e; f; echo ERR); echo OK' 'OK'
  93         echeck 'f() { false; }; (set -e; f; echo ERR); echo OK' 'OK'
  94         dcheck 'f() { return 1; }; (set -e; f; echo ERR); echo OK' 'OK'
  95         echeck 'f() { return 1; }; (set -e; f; echo ERR); echo OK' 'OK'
  96
  97         # but! with set -e, the false should cause an *immediate* exit.
  98         # The return form should not, as such, but there's no way to
  99         # distinguish it.
 100         dcheck 'f() { false; echo ERR; }; (set -e; f); echo OK' 'OK'
 101         echeck 'f() { false; echo ERR; }; (set -e; f); echo OK' 'OK'
 102
 103         # set is not scoped, so these should not exit at all.
 104         dcheck 'f() { set +e; false; echo OK; }; (set -e; f); echo OK' 'OK OK'
 105         echeck 'f() { set +e; false; echo OK; }; (set -e; f); echo OK' 'OK OK'
 106
 107         # according to the standard, only failing *simple* commands
 108         # cause an exit under -e. () is not a simple command.
 109         #   Correct (per POSIX):
 110         #dcheck '(set -e; (set +e; false; echo OK; false); echo OK)' 'OK OK'
 111         #echeck '(set -e; (set +e; false; echo OK; false); echo OK)' 'OK OK'
 112         #   Wrong current behavior:
 113         dcheck '(set -e; (set +e; false; echo OK; false); echo OK)' 'OK'
 114         echeck '(set -e; (set +e; false; echo OK; false); echo OK)' 'OK'
 115
 116         # make sure an inner nested shell does exit though.
 117         dcheck '(set -e; (false; echo ERR)); echo OK' 'OK'
 118
 119         # The left hand side of an || or && is explicitly tested and
 120         # thus should not cause an exit. Furthermore, because a || or
 121         # && expression is not a simple command, there should be no
 122         # exit even if the overall result is false.
 123         dcheck '(set -e; false || true; echo OK); echo OK' 'OK OK'
 124         echeck '(set -e; false || true; echo OK); echo OK' 'OK OK'
 125         dcheck '(set -e; false && true; echo OK); echo OK' 'OK OK'
 126         echeck '(set -e; false && true; echo OK); echo OK' 'OK OK'
 127
 128         # However, the right hand side is not tested, so a failure
 129         # there *should* cause an exit, regardless of whether it
 130         # appears inside a non-simple command.
 131         #
 132         # Note that in at least one place the standard does not
 133         # distinguish between the left and right hand sides of
 134         # logical operators. It is possible that for strict
 135         # compliance these need to not exit; however, if so that
 136         # should probably be limited to when some strict-posix setting
 137         # is in effect and tested accordingly.
 138         #
 139         dcheck '(set -e; false || false; echo ERR); echo OK' 'OK'
 140         dcheck '(set -e; true && false; echo ERR); echo OK' 'OK'
 141         echeck '(set -e; false || false; echo ERR); echo OK' 'OK'
 142         echeck '(set -e; true && false; echo ERR); echo OK' 'OK'
 143
 144         # correct:
 145         #dcheck '(set -e; false && false; echo ERR); echo OK' 'OK'
 146         #echeck '(set -e; false && false; echo ERR); echo OK' 'OK'
 147
 148         # wrong current behavior:
 149         dcheck '(set -e; false && false; echo ERR); echo OK' 'ERR OK'
 150         echeck '(set -e; false && false; echo ERR); echo OK' 'ERR OK'
 151
 152         # A failure that is not reached because of short-circuit
 153         # evaluation should not cause an exit, however.
 154         dcheck '(set -e; true || false; echo OK); echo OK' 'OK OK'
 155         echeck '(set -e; true || false; echo OK); echo OK' 'OK OK'
 156
 157         # For completeness, test the other two combinations.
 158         dcheck '(set -e; true || true; echo OK); echo OK' 'OK OK'
 159         dcheck '(set -e; true && true; echo OK); echo OK' 'OK OK'
 160         echeck '(set -e; true || true; echo OK); echo OK' 'OK OK'
 161         echeck '(set -e; true && true; echo OK); echo OK' 'OK OK'
 162
 163         # likewise, none of these should exit.
 164         dcheck '(set -e; while false; do :; done; echo OK); echo OK' 'OK OK'
 165         dcheck '(set -e; if false; then :; fi; echo OK); echo OK' 'OK OK'
 166         # problematic :-)
 167         #dcheck '(set -e; until false; do :; done; echo OK); echo OK' 'OK OK'
 168         dcheck '(set -e; until [ "$t" = 1 ]; do t=1; done; echo OK); echo OK' \
 169           'OK OK'
 170         echeck '(set -e; while false; do :; done; echo OK); echo OK' 'OK OK'
 171         echeck '(set -e; if false; then :; fi; echo OK); echo OK' 'OK OK'
 172         echeck '(set -e; until [ "$t" = 1 ]; do t=1; done; echo OK); echo OK' \
 173           'OK OK'
 174
 175         # the bang operator tests its argument and thus the argument
 176         # should not cause an exit. it is also not a simple command (I
 177         # believe) so it also shouldn't exit even if it yields a false
 178         # result.
 179         dcheck '(set -e; ! false; echo OK); echo OK' 'OK OK'
 180         dcheck '(set -e; ! true; echo OK); echo OK' 'OK OK'
 181         echeck '(set -e; ! false; echo OK); echo OK' 'OK OK'
 182         echeck '(set -e; ! true; echo OK); echo OK' 'OK OK'
 183
 184         # combined case with () and &&; the inner expression is false
 185         # but does not itself exit, and the () should not cause an
 186         # exit even when failing.
 187         # correct:
 188         #dcheck '(set -e; (false && true); echo OK); echo OK' 'OK OK'
 189         #echeck '(set -e; (false && true); echo OK); echo OK' 'OK OK'
 190         # wrong current behavior:
 191         dcheck '(set -e; (false && true); echo OK); echo OK' 'OK'
 192         echeck '(set -e; (false && true); echo OK); echo OK' 'OK'
 193
 194         # pipelines. only the right-hand end is significant.
 195         dcheck '(set -e; false | true; echo OK); echo OK' 'OK OK'
 196         echeck '(set -e; false | true; echo OK); echo OK' 'OK OK'
 197         dcheck '(set -e; true | false; echo ERR); echo OK' 'OK'
 198         echeck '(set -e; true | false; echo ERR); echo OK' 'OK'
 199
 200         dcheck '(set -e; while true | false; do :; done; echo OK); echo OK' \
 201             'OK OK'
 202         dcheck '(set -e; if true | false; then :; fi; echo OK); echo OK' \
 203             'OK OK'
 204
 205
 206         # According to dsl@ in PR bin/32282, () is not defined as a
 207         # subshell, only as a grouping operator [and a scope, I guess]
 208         # so the nested false ought to cause the whole shell to exit,
 209         # not just the subshell. dholland@ would like to see C&V,
 210         # because that seems like a bad idea. (Among other things, it
 211         # would break all the above test logic, which relies on being
 212         # able to isolate set -e behavior inside ().) However, I'm
 213         # going to put these tests here to make sure the issue gets
 214         # dealt with sometime.
 215         #
 216         # XXX: the second set has been disabled in the name of making
 217         # all tests "pass".
 218
 219         # 1. error if the whole shell exits (current behavior)
 220         dcheck 'echo OK; (set -e; false); echo OK' 'OK OK'
 221         echeck 'echo OK; (set -e; false); echo OK' 'OK OK'
 222         # 2. error if the whole shell does not exit (dsl's suggested behavior)
 223         #dcheck 'echo OK; (set -e; false); echo ERR' 'OK'
 224         #echeck 'echo OK; (set -e; false); echo ERR' 'OK'
 225
 226         # The current behavior of the shell is that it exits out as
 227         # far as -e is set and then stops. This is probably a
 228         # consequence of it handling () wrong, but it's a somewhat
 229         # curious compromise position between 1. and 2. above.
 230         dcheck '(set -e; (false; echo ERR); echo ERR); echo OK' 'OK'
 231         echeck '(set -e; (false; echo ERR); echo ERR); echo OK' 'OK'
 232
 233         # backquote expansion (PR bin/17514)
 234
 235         # correct
 236         #dcheck '(set -e; echo ERR `false`; echo ERR); echo OK' 'OK'
 237         #dcheck '(set -e; echo ERR $(false); echo ERR); echo OK' 'OK'
 238         #dcheck '(set -e; echo ERR `exit 3`; echo ERR); echo OK' 'OK'
 239         #dcheck '(set -e; echo ERR $(exit 3); echo ERR); echo OK' 'OK'
 240         # wrong current behavior
 241         dcheck '(set -e; echo ERR `false`; echo ERR); echo OK' 'ERR ERR OK'
 242         dcheck '(set -e; echo ERR $(false); echo ERR); echo OK' 'ERR ERR OK'
 243         dcheck '(set -e; echo ERR `exit 3`; echo ERR); echo OK' 'ERR ERR OK'
 244         dcheck '(set -e; echo ERR $(exit 3); echo ERR); echo OK' 'ERR ERR OK'
 245
 246         dcheck '(set -e; x=`false`; echo ERR); echo OK' 'OK'
 247         dcheck '(set -e; x=$(false); echo ERR); echo OK' 'OK'
 248         dcheck '(set -e; x=`exit 3`; echo ERR); echo OK' 'OK'
 249         dcheck '(set -e; x=$(exit 3); echo ERR); echo OK' 'OK'
 250
 251         # correct
 252         #echeck '(set -e; echo ERR `false`; echo ERR); echo OK' 'OK'
 253         #echeck '(set -e; echo ERR $(false); echo ERR); echo OK' 'OK'
 254         #echeck '(set -e; echo ERR `exit 3`; echo ERR); echo OK' 'OK'
 255         #echeck '(set -e; echo ERR $(exit 3); echo ERR); echo OK' 'OK'
 256
 257         # wrong current behavior
 258         echeck '(set -e; echo ERR `false`; echo ERR); echo OK' 'ERR ERR OK'
 259         echeck '(set -e; echo ERR $(false); echo ERR); echo OK' 'ERR ERR OK'
 260         echeck '(set -e; echo ERR `exit 3`; echo ERR); echo OK' 'ERR ERR OK'
 261         echeck '(set -e; echo ERR $(exit 3); echo ERR); echo OK' 'ERR ERR OK'
 262
 263         echeck '(set -e; x=`false`; echo ERR); echo OK' 'OK'
 264         echeck '(set -e; x=$(false); echo ERR); echo OK' 'OK'
 265         echeck '(set -e; x=`exit 3`; echo ERR); echo OK' 'OK'
 266         echeck '(set -e; x=$(exit 3); echo ERR); echo OK' 'OK'
 267
 268         # shift (PR bin/37493)
 269         # correct
 270         #dcheck '(set -e; shift || true; echo OK); echo OK' 'OK OK'
 271         #echeck '(set -e; shift || true; echo OK); echo OK' 'OK OK'
 272         # wrong current behavior
 273         dcheck '(set -e; shift || true; echo OK); echo OK' 'OK'
 274         echeck '(set -e; shift || true; echo OK); echo OK' 'OK'
 275
 276         # Done.
 277
 278         if [ "x$SH_FAILS" != x ]; then
 279             printf '%-56s %-8s  %s\n' "Expression" "Result" "Should be"
 280             echo "$SH_FAILS"
 281             atf_fail "$failcount of $count failed cases"
 282         else
 283             atf_pass
 284         fi
 285 }
 286
 287 atf_init_test_cases() {
 288         atf_add_test_case all
 289 }