t/test-lib.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5
   6 # if --tee was passed, write the output not only to the terminal, but
   7 # additionally to the file test-results/$BASENAME.out, too.
   8 case "$GIT_TEST_TEE_STARTED, $* " in
   9 done,*)
  10         # do not redirect again
  11         ;;
  12 *' --tee '*|*' --va'*)
  13         mkdir -p test-results
  14         BASE=test-results/$(basename "$0" .sh)
  15         (GIT_TEST_TEE_STARTED=done ${SHELL-sh} "$0" "$@" 2>&1;
  16          echo $? > $BASE.exit) | tee $BASE.out
  17         test "$(cat $BASE.exit)" = 0
  18         exit
  19         ;;
  20 esac
  21
  22 # Keep the original TERM for say_color
  23 ORIGINAL_TERM=$TERM
  24
  25 # For repeatability, reset the environment to known value.
  26 LANG=C
  27 LC_ALL=C
  28 PAGER=cat
  29 TZ=UTC
  30 TERM=dumb
  31 export LANG LC_ALL PAGER TERM TZ
  32 EDITOR=:
  33 VISUAL=:
  34 unset GIT_EDITOR
  35 unset AUTHOR_DATE
  36 unset AUTHOR_EMAIL
  37 unset AUTHOR_NAME
  38 unset COMMIT_AUTHOR_EMAIL
  39 unset COMMIT_AUTHOR_NAME
  40 unset EMAIL
  41 unset GIT_ALTERNATE_OBJECT_DIRECTORIES
  42 unset GIT_AUTHOR_DATE
  43 GIT_AUTHOR_EMAIL=author@example.com
  44 GIT_AUTHOR_NAME='A U Thor'
  45 unset GIT_COMMITTER_DATE
  46 GIT_COMMITTER_EMAIL=committer@example.com
  47 GIT_COMMITTER_NAME='C O Mitter'
  48 unset GIT_DIFF_OPTS
  49 unset GIT_DIR
  50 unset GIT_WORK_TREE
  51 unset GIT_EXTERNAL_DIFF
  52 unset GIT_INDEX_FILE
  53 unset GIT_OBJECT_DIRECTORY
  54 unset GIT_CEILING_DIRECTORIES
  55 unset SHA1_FILE_DIRECTORIES
  56 unset SHA1_FILE_DIRECTORY
  57 GIT_MERGE_VERBOSITY=5
  58 export GIT_MERGE_VERBOSITY
  59 export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
  60 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
  61 export EDITOR VISUAL
  62 GIT_TEST_CMP=${GIT_TEST_CMP:-diff -u}
  63
  64 # Protect ourselves from common misconfiguration to export
  65 # CDPATH into the environment
  66 unset CDPATH
  67
  68 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
  69         1|2|true)
  70                 echo "* warning: Some tests will not work if GIT_TRACE" \
  71                         "is set as to trace on STDERR ! *"
  72                 echo "* warning: Please set GIT_TRACE to something" \
  73                         "other than 1, 2 or true ! *"
  74                 ;;
  75 esac
  76
  77 # Each test should start with something like this, after copyright notices:
  78 #
  79 # test_description='Description of this test...
  80 # This test checks if command xyzzy does the right thing...
  81 # '
  82 # . ./test-lib.sh
  83 [ "x$ORIGINAL_TERM" != "xdumb" ] && (
  84                 TERM=$ORIGINAL_TERM &&
  85                 export TERM &&
  86                 [ -t 1 ] &&
  87                 tput bold >/dev/null 2>&1 &&
  88                 tput setaf 1 >/dev/null 2>&1 &&
  89                 tput sgr0 >/dev/null 2>&1
  90         ) &&
  91         color=t
  92
  93 while test "$#" -ne 0
  94 do
  95         case "$1" in
  96         -d|--d|--de|--deb|--debu|--debug)
  97                 debug=t; shift ;;
  98         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
  99                 immediate=t; shift ;;
 100         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 101                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 102         -h|--h|--he|--hel|--help)
 103                 help=t; shift ;;
 104         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
 105                 verbose=t; shift ;;
 106         -q|--q|--qu|--qui|--quie|--quiet)
 107                 quiet=t; shift ;;
 108         --no-color)
 109                 color=; shift ;;
 110         --no-python)
 111                 # noop now...
 112                 shift ;;
 113         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 114                 valgrind=t; verbose=t; shift ;;
 115         --tee)
 116                 shift ;; # was handled already
 117         *)
 118                 break ;;
 119         esac
 120 done
 121
 122 if test -n "$color"; then
 123         say_color () {
 124                 (
 125                 TERM=$ORIGINAL_TERM
 126                 export TERM
 127                 case "$1" in
 128                         error) tput bold; tput setaf 1;; # bold red
 129                         skip)  tput bold; tput setaf 2;; # bold green
 130                         pass)  tput setaf 2;;            # green
 131                         info)  tput setaf 3;;            # brown
 132                         *) test -n "$quiet" && return;;
 133                 esac
 134                 shift
 135                 printf "* %s" "$*"
 136                 tput sgr0
 137                 echo
 138                 )
 139         }
 140 else
 141         say_color() {
 142                 test -z "$1" && test -n "$quiet" && return
 143                 shift
 144                 echo "* $*"
 145         }
 146 fi
 147
 148 error () {
 149         say_color error "error: $*"
 150         trap - EXIT
 151         exit 1
 152 }
 153
 154 say () {
 155         say_color info "$*"
 156 }
 157
 158 test "${test_description}" != "" ||
 159 error "Test script did not set test_description."
 160
 161 if test "$help" = "t"
 162 then
 163         echo "$test_description"
 164         exit 0
 165 fi
 166
 167 exec 5>&1
 168 if test "$verbose" = "t"
 169 then
 170         exec 4>&2 3>&1
 171 else
 172         exec 4>/dev/null 3>/dev/null
 173 fi
 174
 175 test_failure=0
 176 test_count=0
 177 test_fixed=0
 178 test_broken=0
 179 test_success=0
 180
 181 die () {
 182         echo >&5 "FATAL: Unexpected exit with code $?"
 183         exit 1
 184 }
 185
 186 trap 'die' EXIT
 187
 188 # The semantics of the editor variables are that of invoking
 189 # sh -c "$EDITOR \"$@\"" files ...
 190 #
 191 # If our trash directory contains shell metacharacters, they will be
 192 # interpreted if we just set $EDITOR directly, so do a little dance with
 193 # environment variables to work around this.
 194 #
 195 # In particular, quoting isn't enough, as the path may contain the same quote
 196 # that we're using.
 197 test_set_editor () {
 198         FAKE_EDITOR="$1"
 199         export FAKE_EDITOR
 200         VISUAL='"$FAKE_EDITOR"'
 201         export VISUAL
 202 }
 203
 204 test_tick () {
 205         if test -z "${test_tick+set}"
 206         then
 207                 test_tick=1112911993
 208         else
 209                 test_tick=$(($test_tick + 60))
 210         fi
 211         GIT_COMMITTER_DATE="$test_tick -0700"
 212         GIT_AUTHOR_DATE="$test_tick -0700"
 213         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 214 }
 215
 216 # Call test_commit with the arguments "<message> [<file> [<contents>]]"
 217 #
 218 # This will commit a file with the given contents and the given commit
 219 # message.  It will also add a tag with <message> as name.
 220 #
 221 # Both <file> and <contents> default to <message>.
 222
 223 test_commit () {
 224         file=${2:-"$1.t"}
 225         echo "${3-$1}" > "$file" &&
 226         git add "$file" &&
 227         test_tick &&
 228         git commit -m "$1" &&
 229         git tag "$1"
 230 }
 231
 232 # Call test_merge with the arguments "<message> <commit>", where <commit>
 233 # can be a tag pointing to the commit-to-merge.
 234
 235 test_merge () {
 236         test_tick &&
 237         git merge -m "$1" "$2" &&
 238         git tag "$1"
 239 }
 240
 241 # This function helps systems where core.filemode=false is set.
 242 # Use it instead of plain 'chmod +x' to set or unset the executable bit
 243 # of a file in the working directory and add it to the index.
 244
 245 test_chmod () {
 246         chmod "$@" &&
 247         git update-index --add "--chmod=$@"
 248 }
 249
 250 # Use test_set_prereq to tell that a particular prerequisite is available.
 251 # The prerequisite can later be checked for in two ways:
 252 #
 253 # - Explicitly using test_have_prereq.
 254 #
 255 # - Implicitly by specifying the prerequisite tag in the calls to
 256 #   test_expect_{success,failure,code}.
 257 #
 258 # The single parameter is the prerequisite tag (a simple word, in all
 259 # capital letters by convention).
 260
 261 test_set_prereq () {
 262         satisfied="$satisfied$1 "
 263 }
 264 satisfied=" "
 265
 266 test_have_prereq () {
 267         case $satisfied in
 268         *" $1 "*)
 269                 : yes, have it ;;
 270         *)
 271                 ! : nope ;;
 272         esac
 273 }
 274
 275 # You are not expected to call test_ok_ and test_failure_ directly, use
 276 # the text_expect_* functions instead.
 277
 278 test_ok_ () {
 279         test_success=$(($test_success + 1))
 280         say_color "" "  ok $test_count: $@"
 281 }
 282
 283 test_failure_ () {
 284         test_failure=$(($test_failure + 1))
 285         say_color error "FAIL $test_count: $1"
 286         shift
 287         echo "$@" | sed -e 's/^/        /'
 288         test "$immediate" = "" || { trap - EXIT; exit 1; }
 289 }
 290
 291 test_known_broken_ok_ () {
 292         test_fixed=$(($test_fixed+1))
 293         say_color "" "  FIXED $test_count: $@"
 294 }
 295
 296 test_known_broken_failure_ () {
 297         test_broken=$(($test_broken+1))
 298         say_color skip "  still broken $test_count: $@"
 299 }
 300
 301 test_debug () {
 302         test "$debug" = "" || eval "$1"
 303 }
 304
 305 test_run_ () {
 306         eval >&3 2>&4 "$1"
 307         eval_ret="$?"
 308         return 0
 309 }
 310
 311 test_skip () {
 312         test_count=$(($test_count+1))
 313         to_skip=
 314         for skp in $GIT_SKIP_TESTS
 315         do
 316                 case $this_test.$test_count in
 317                 $skp)
 318                         to_skip=t
 319                 esac
 320         done
 321         if test -z "$to_skip" && test -n "$prereq" &&
 322            ! test_have_prereq "$prereq"
 323         then
 324                 to_skip=t
 325         fi
 326         case "$to_skip" in
 327         t)
 328                 say_color skip >&3 "skipping test: $@"
 329                 say_color skip "skip $test_count: $1"
 330                 : true
 331                 ;;
 332         *)
 333                 false
 334                 ;;
 335         esac
 336 }
 337
 338 test_expect_failure () {
 339         test "$#" = 3 && { prereq=$1; shift; } || prereq=
 340         test "$#" = 2 ||
 341         error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
 342         if ! test_skip "$@"
 343         then
 344                 say >&3 "checking known breakage: $2"
 345                 test_run_ "$2"
 346                 if [ "$?" = 0 -a "$eval_ret" = 0 ]
 347                 then
 348                         test_known_broken_ok_ "$1"
 349                 else
 350                     test_known_broken_failure_ "$1"
 351                 fi
 352         fi
 353         echo >&3 ""
 354 }
 355
 356 test_expect_success () {
 357         test "$#" = 3 && { prereq=$1; shift; } || prereq=
 358         test "$#" = 2 ||
 359         error "bug in the test script: not 2 or 3 parameters to test-expect-success"
 360         if ! test_skip "$@"
 361         then
 362                 say >&3 "expecting success: $2"
 363                 test_run_ "$2"
 364                 if [ "$?" = 0 -a "$eval_ret" = 0 ]
 365                 then
 366                         test_ok_ "$1"
 367                 else
 368                         test_failure_ "$@"
 369                 fi
 370         fi
 371         echo >&3 ""
 372 }
 373
 374 test_expect_code () {
 375         test "$#" = 4 && { prereq=$1; shift; } || prereq=
 376         test "$#" = 3 ||
 377         error "bug in the test script: not 3 or 4 parameters to test-expect-code"
 378         if ! test_skip "$@"
 379         then
 380                 say >&3 "expecting exit code $1: $3"
 381                 test_run_ "$3"
 382                 if [ "$?" = 0 -a "$eval_ret" = "$1" ]
 383                 then
 384                         test_ok_ "$2"
 385                 else
 386                         test_failure_ "$@"
 387                 fi
 388         fi
 389         echo >&3 ""
 390 }
 391
 392 # test_external runs external test scripts that provide continuous
 393 # test output about their progress, and succeeds/fails on
 394 # zero/non-zero exit code.  It outputs the test output on stdout even
 395 # in non-verbose mode, and announces the external script with "* run
 396 # <n>: ..." before running it.  When providing relative paths, keep in
 397 # mind that all scripts run in "trash directory".
 398 # Usage: test_external description command arguments...
 399 # Example: test_external 'Perl API' perl ../path/to/test.pl
 400 test_external () {
 401         test "$#" = 4 && { prereq=$1; shift; } || prereq=
 402         test "$#" = 3 ||
 403         error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
 404         descr="$1"
 405         shift
 406         if ! test_skip "$descr" "$@"
 407         then
 408                 # Announce the script to reduce confusion about the
 409                 # test output that follows.
 410                 say_color "" " run $test_count: $descr ($*)"
 411                 # Run command; redirect its stderr to &4 as in
 412                 # test_run_, but keep its stdout on our stdout even in
 413                 # non-verbose mode.
 414                 "$@" 2>&4
 415                 if [ "$?" = 0 ]
 416                 then
 417                         test_ok_ "$descr"
 418                 else
 419                         test_failure_ "$descr" "$@"
 420                 fi
 421         fi
 422 }
 423
 424 # Like test_external, but in addition tests that the command generated
 425 # no output on stderr.
 426 test_external_without_stderr () {
 427         # The temporary file has no (and must have no) security
 428         # implications.
 429         tmp="$TMPDIR"; if [ -z "$tmp" ]; then tmp=/tmp; fi
 430         stderr="$tmp/git-external-stderr.$$.tmp"
 431         test_external "$@" 4> "$stderr"
 432         [ -f "$stderr" ] || error "Internal error: $stderr disappeared."
 433         descr="no stderr: $1"
 434         shift
 435         say >&3 "expecting no stderr from previous command"
 436         if [ ! -s "$stderr" ]; then
 437                 rm "$stderr"
 438                 test_ok_ "$descr"
 439         else
 440                 if [ "$verbose" = t ]; then
 441                         output=`echo; echo Stderr is:; cat "$stderr"`
 442                 else
 443                         output=
 444                 fi
 445                 # rm first in case test_failure exits.
 446                 rm "$stderr"
 447                 test_failure_ "$descr" "$@" "$output"
 448         fi
 449 }
 450
 451 # This is not among top-level (test_expect_success | test_expect_failure)
 452 # but is a prefix that can be used in the test script, like:
 453 #
 454 #       test_expect_success 'complain and die' '
 455 #           do something &&
 456 #           do something else &&
 457 #           test_must_fail git checkout ../outerspace
 458 #       '
 459 #
 460 # Writing this as "! git checkout ../outerspace" is wrong, because
 461 # the failure could be due to a segv.  We want a controlled failure.
 462
 463 test_must_fail () {
 464         "$@"
 465         test $? -gt 0 -a $? -le 129 -o $? -gt 192
 466 }
 467
 468 # test_cmp is a helper function to compare actual and expected output.
 469 # You can use it like:
 470 #
 471 #       test_expect_success 'foo works' '
 472 #               echo expected >expected &&
 473 #               foo >actual &&
 474 #               test_cmp expected actual
 475 #       '
 476 #
 477 # This could be written as either "cmp" or "diff -u", but:
 478 # - cmp's output is not nearly as easy to read as diff -u
 479 # - not all diff versions understand "-u"
 480
 481 test_cmp() {
 482         $GIT_TEST_CMP "$@"
 483 }
 484
 485 # Most tests can use the created repository, but some may need to create more.
 486 # Usage: test_create_repo <directory>
 487 test_create_repo () {
 488         test "$#" = 1 ||
 489         error "bug in the test script: not 1 parameter to test-create-repo"
 490         owd=`pwd`
 491         repo="$1"
 492         mkdir -p "$repo"
 493         cd "$repo" || error "Cannot setup test environment"
 494         "$GIT_EXEC_PATH/git-init" "--template=$owd/../templates/blt/" >&3 2>&4 ||
 495         error "cannot run git init -- have you built things yet?"
 496         mv .git/hooks .git/hooks-disabled
 497         cd "$owd"
 498 }
 499
 500 test_done () {
 501         trap - EXIT
 502         test_results_dir="$TEST_DIRECTORY/test-results"
 503         mkdir -p "$test_results_dir"
 504         test_results_path="$test_results_dir/${0%.sh}-$$"
 505
 506         echo "total $test_count" >> $test_results_path
 507         echo "success $test_success" >> $test_results_path
 508         echo "fixed $test_fixed" >> $test_results_path
 509         echo "broken $test_broken" >> $test_results_path
 510         echo "failed $test_failure" >> $test_results_path
 511         echo "" >> $test_results_path
 512
 513         if test "$test_fixed" != 0
 514         then
 515                 say_color pass "fixed $test_fixed known breakage(s)"
 516         fi
 517         if test "$test_broken" != 0
 518         then
 519                 say_color error "still have $test_broken known breakage(s)"
 520                 msg="remaining $(($test_count-$test_broken)) test(s)"
 521         else
 522                 msg="$test_count test(s)"
 523         fi
 524         case "$test_failure" in
 525         0)
 526                 # We could:
 527                 # cd .. && rm -fr 'trash directory'
 528                 # but that means we forbid any tests that use their own
 529                 # subdirectory from calling test_done without coming back
 530                 # to where they started from.
 531                 # The Makefile provided will clean this test area so
 532                 # we will leave things as they are.
 533
 534                 say_color pass "passed all $msg"
 535
 536                 test -d "$remove_trash" &&
 537                 cd "$(dirname "$remove_trash")" &&
 538                 rm -rf "$(basename "$remove_trash")"
 539
 540                 exit 0 ;;
 541
 542         *)
 543                 say_color error "failed $test_failure among $msg"
 544                 exit 1 ;;
 545
 546         esac
 547 }
 548
 549 # Test the binaries we have just built.  The tests are kept in
 550 # t/ subdirectory and are run in 'trash directory' subdirectory.
 551 TEST_DIRECTORY=$(pwd)
 552 if test -z "$valgrind"
 553 then
 554         if test -z "$GIT_TEST_INSTALLED"
 555         then
 556                 PATH=$TEST_DIRECTORY/..:$PATH
 557                 GIT_EXEC_PATH=$TEST_DIRECTORY/..
 558         else
 559                 GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 560                 error "Cannot run git from $GIT_TEST_INSTALLED."
 561                 PATH=$GIT_TEST_INSTALLED:$TEST_DIRECTORY/..:$PATH
 562                 GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 563         fi
 564 else
 565         make_symlink () {
 566                 test -h "$2" &&
 567                 test "$1" = "$(readlink "$2")" || {
 568                         # be super paranoid
 569                         if mkdir "$2".lock
 570                         then
 571                                 rm -f "$2" &&
 572                                 ln -s "$1" "$2" &&
 573                                 rm -r "$2".lock
 574                         else
 575                                 while test -d "$2".lock
 576                                 do
 577                                         say "Waiting for lock on $2."
 578                                         sleep 1
 579                                 done
 580                         fi
 581                 }
 582         }
 583
 584         make_valgrind_symlink () {
 585                 # handle only executables
 586                 test -x "$1" || return
 587
 588                 base=$(basename "$1")
 589                 symlink_target=$TEST_DIRECTORY/../$base
 590                 # do not override scripts
 591                 if test -x "$symlink_target" &&
 592                     test ! -d "$symlink_target" &&
 593                     test "#!" != "$(head -c 2 < "$symlink_target")"
 594                 then
 595                         symlink_target=../valgrind.sh
 596                 fi
 597                 case "$base" in
 598                 *.sh|*.perl)
 599                         symlink_target=../unprocessed-script
 600                 esac
 601                 # create the link, or replace it if it is out of date
 602                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
 603         }
 604
 605         # override all git executables in TEST_DIRECTORY/..
 606         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
 607         mkdir -p "$GIT_VALGRIND"/bin
 608         for file in $TEST_DIRECTORY/../git* $TEST_DIRECTORY/../test-*
 609         do
 610                 make_valgrind_symlink $file
 611         done
 612         OLDIFS=$IFS
 613         IFS=:
 614         for path in $PATH
 615         do
 616                 ls "$path"/git-* 2> /dev/null |
 617                 while read file
 618                 do
 619                         make_valgrind_symlink "$file"
 620                 done
 621         done
 622         IFS=$OLDIFS
 623         PATH=$GIT_VALGRIND/bin:$PATH
 624         GIT_EXEC_PATH=$GIT_VALGRIND/bin
 625         export GIT_VALGRIND
 626 fi
 627 GIT_TEMPLATE_DIR=$(pwd)/../templates/blt
 628 unset GIT_CONFIG
 629 GIT_CONFIG_NOSYSTEM=1
 630 GIT_CONFIG_NOGLOBAL=1
 631 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_CONFIG_NOGLOBAL
 632
 633 GITPERLLIB=$(pwd)/../perl/blib/lib:$(pwd)/../perl/blib/arch/auto/Git
 634 export GITPERLLIB
 635 test -d ../templates/blt || {
 636         error "You haven't built things yet, have you?"
 637 }
 638
 639 if ! test -x ../test-chmtime; then
 640         echo >&2 'You need to build test-chmtime:'
 641         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 642         exit 1
 643 fi
 644
 645 . ../GIT-BUILD-OPTIONS
 646
 647 # Test repository
 648 test="trash directory.$(basename "$0" .sh)"
 649 test ! -z "$debug" || remove_trash="$TEST_DIRECTORY/$test"
 650 rm -fr "$test" || {
 651         trap - EXIT
 652         echo >&5 "FATAL: Cannot prepare test area"
 653         exit 1
 654 }
 655
 656 test_create_repo "$test"
 657 # Use -P to resolve symlinks in our working directory so that the cwd
 658 # in subprocesses like git equals our $PWD (for pathname comparisons).
 659 cd -P "$test" || exit 1
 660
 661 this_test=${0##*/}
 662 this_test=${this_test%%-*}
 663 for skp in $GIT_SKIP_TESTS
 664 do
 665         to_skip=
 666         for skp in $GIT_SKIP_TESTS
 667         do
 668                 case "$this_test" in
 669                 $skp)
 670                         to_skip=t
 671                 esac
 672         done
 673         case "$to_skip" in
 674         t)
 675                 say_color skip >&3 "skipping test $this_test altogether"
 676                 say_color skip "skip all tests in $this_test"
 677                 test_done
 678         esac
 679 done
 680
 681 # Fix some commands on Windows
 682 case $(uname -s) in
 683 *MINGW*)
 684         # Windows has its own (incompatible) sort and find
 685         sort () {
 686                 /usr/bin/sort "$@"
 687         }
 688         find () {
 689                 /usr/bin/find "$@"
 690         }
 691         sum () {
 692                 md5sum "$@"
 693         }
 694         # git sees Windows-style pwd
 695         pwd () {
 696                 builtin pwd -W
 697         }
 698         # no POSIX permissions
 699         # backslashes in pathspec are converted to '/'
 700         # exec does not inherit the PID
 701         ;;
 702 *)
 703         test_set_prereq POSIXPERM
 704         test_set_prereq BSLASHPSPEC
 705         test_set_prereq EXECKEEPSPID
 706         ;;
 707 esac
 708
 709 # test whether the filesystem supports symbolic links
 710 ln -s x y 2>/dev/null && test -h y 2>/dev/null && test_set_prereq SYMLINKS
 711 rm -f y