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 "$1" in
  96         -d|--d|--de|--deb|--debu|--debug)
  97                 debug=t; shift ;;
  98         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
  99                 immediate=t; shift ;;
 100         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 101                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 102         -h|--h|--he|--hel|--help)
 103                 help=t; shift ;;
 104         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
 105                 verbose=t; shift ;;
 106         -q|--q|--qu|--qui|--quie|--quiet)
 107                 quiet=t; shift ;;
 108         --no-color)
 109                 color=; shift ;;
 110         --no-python)
 111                 # noop now...
 112                 shift ;;
 113         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 114                 valgrind=t; verbose=t; shift ;;
 115         --tee)
 116                 shift ;; # was handled already
 117         --root=*)
 118                 root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 119                 shift ;;
 120         *)
 121                 echo "error: unknown test option '$1'" >&2; exit 1 ;;
 122         esac
 123 done
 124
 125 if test -n "$color"; then
 126         say_color () {
 127                 (
 128                 TERM=$ORIGINAL_TERM
 129                 export TERM
 130                 case "$1" in
 131                         error) tput bold; tput setaf 1;; # bold red
 132                         skip)  tput bold; tput setaf 2;; # bold green
 133                         pass)  tput setaf 2;;            # green
 134                         info)  tput setaf 3;;            # brown
 135                         *) test -n "$quiet" && return;;
 136                 esac
 137                 shift
 138                 printf "* %s" "$*"
 139                 tput sgr0
 140                 echo
 141                 )
 142         }
 143 else
 144         say_color() {
 145                 test -z "$1" && test -n "$quiet" && return
 146                 shift
 147                 echo "* $*"
 148         }
 149 fi
 150
 151 error () {
 152         say_color error "error: $*"
 153         GIT_EXIT_OK=t
 154         exit 1
 155 }
 156
 157 say () {
 158         say_color info "$*"
 159 }
 160
 161 test "${test_description}" != "" ||
 162 error "Test script did not set test_description."
 163
 164 if test "$help" = "t"
 165 then
 166         echo "$test_description"
 167         exit 0
 168 fi
 169
 170 exec 5>&1
 171 if test "$verbose" = "t"
 172 then
 173         exec 4>&2 3>&1
 174 else
 175         exec 4>/dev/null 3>/dev/null
 176 fi
 177
 178 test_failure=0
 179 test_count=0
 180 test_fixed=0
 181 test_broken=0
 182 test_success=0
 183
 184 die () {
 185         code=$?
 186         if test -n "$GIT_EXIT_OK"
 187         then
 188                 exit $code
 189         else
 190                 echo >&5 "FATAL: Unexpected exit with code $code"
 191                 exit 1
 192         fi
 193 }
 194
 195 GIT_EXIT_OK=
 196 trap 'die' EXIT
 197
 198 # The semantics of the editor variables are that of invoking
 199 # sh -c "$EDITOR \"$@\"" files ...
 200 #
 201 # If our trash directory contains shell metacharacters, they will be
 202 # interpreted if we just set $EDITOR directly, so do a little dance with
 203 # environment variables to work around this.
 204 #
 205 # In particular, quoting isn't enough, as the path may contain the same quote
 206 # that we're using.
 207 test_set_editor () {
 208         FAKE_EDITOR="$1"
 209         export FAKE_EDITOR
 210         VISUAL='"$FAKE_EDITOR"'
 211         export VISUAL
 212 }
 213
 214 test_tick () {
 215         if test -z "${test_tick+set}"
 216         then
 217                 test_tick=1112911993
 218         else
 219                 test_tick=$(($test_tick + 60))
 220         fi
 221         GIT_COMMITTER_DATE="$test_tick -0700"
 222         GIT_AUTHOR_DATE="$test_tick -0700"
 223         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 224 }
 225
 226 # Call test_commit with the arguments "<message> [<file> [<contents>]]"
 227 #
 228 # This will commit a file with the given contents and the given commit
 229 # message.  It will also add a tag with <message> as name.
 230 #
 231 # Both <file> and <contents> default to <message>.
 232
 233 test_commit () {
 234         file=${2:-"$1.t"}
 235         echo "${3-$1}" > "$file" &&
 236         git add "$file" &&
 237         test_tick &&
 238         git commit -m "$1" &&
 239         git tag "$1"
 240 }
 241
 242 # Call test_merge with the arguments "<message> <commit>", where <commit>
 243 # can be a tag pointing to the commit-to-merge.
 244
 245 test_merge () {
 246         test_tick &&
 247         git merge -m "$1" "$2" &&
 248         git tag "$1"
 249 }
 250
 251 # This function helps systems where core.filemode=false is set.
 252 # Use it instead of plain 'chmod +x' to set or unset the executable bit
 253 # of a file in the working directory and add it to the index.
 254
 255 test_chmod () {
 256         chmod "$@" &&
 257         git update-index --add "--chmod=$@"
 258 }
 259
 260 # Use test_set_prereq to tell that a particular prerequisite is available.
 261 # The prerequisite can later be checked for in two ways:
 262 #
 263 # - Explicitly using test_have_prereq.
 264 #
 265 # - Implicitly by specifying the prerequisite tag in the calls to
 266 #   test_expect_{success,failure,code}.
 267 #
 268 # The single parameter is the prerequisite tag (a simple word, in all
 269 # capital letters by convention).
 270
 271 test_set_prereq () {
 272         satisfied="$satisfied$1 "
 273 }
 274 satisfied=" "
 275
 276 test_have_prereq () {
 277         case $satisfied in
 278         *" $1 "*)
 279                 : yes, have it ;;
 280         *)
 281                 ! : nope ;;
 282         esac
 283 }
 284
 285 # You are not expected to call test_ok_ and test_failure_ directly, use
 286 # the text_expect_* functions instead.
 287
 288 test_ok_ () {
 289         test_success=$(($test_success + 1))
 290         say_color "" "  ok $test_count: $@"
 291 }
 292
 293 test_failure_ () {
 294         test_failure=$(($test_failure + 1))
 295         say_color error "FAIL $test_count: $1"
 296         shift
 297         echo "$@" | sed -e 's/^/        /'
 298         test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
 299 }
 300
 301 test_known_broken_ok_ () {
 302         test_fixed=$(($test_fixed+1))
 303         say_color "" "  FIXED $test_count: $@"
 304 }
 305
 306 test_known_broken_failure_ () {
 307         test_broken=$(($test_broken+1))
 308         say_color skip "  still broken $test_count: $@"
 309 }
 310
 311 test_debug () {
 312         test "$debug" = "" || eval "$1"
 313 }
 314
 315 test_run_ () {
 316         eval >&3 2>&4 "$1"
 317         eval_ret="$?"
 318         return 0
 319 }
 320
 321 test_skip () {
 322         test_count=$(($test_count+1))
 323         to_skip=
 324         for skp in $GIT_SKIP_TESTS
 325         do
 326                 case $this_test.$test_count in
 327                 $skp)
 328                         to_skip=t
 329                 esac
 330         done
 331         if test -z "$to_skip" && test -n "$prereq" &&
 332            ! test_have_prereq "$prereq"
 333         then
 334                 to_skip=t
 335         fi
 336         case "$to_skip" in
 337         t)
 338                 say_color skip >&3 "skipping test: $@"
 339                 say_color skip "skip $test_count: $1"
 340                 : true
 341                 ;;
 342         *)
 343                 false
 344                 ;;
 345         esac
 346 }
 347
 348 test_expect_failure () {
 349         test "$#" = 3 && { prereq=$1; shift; } || prereq=
 350         test "$#" = 2 ||
 351         error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
 352         if ! test_skip "$@"
 353         then
 354                 say >&3 "checking known breakage: $2"
 355                 test_run_ "$2"
 356                 if [ "$?" = 0 -a "$eval_ret" = 0 ]
 357                 then
 358                         test_known_broken_ok_ "$1"
 359                 else
 360                         test_known_broken_failure_ "$1"
 361                 fi
 362         fi
 363         echo >&3 ""
 364 }
 365
 366 test_expect_success () {
 367         test "$#" = 3 && { prereq=$1; shift; } || prereq=
 368         test "$#" = 2 ||
 369         error "bug in the test script: not 2 or 3 parameters to test-expect-success"
 370         if ! test_skip "$@"
 371         then
 372                 say >&3 "expecting success: $2"
 373                 test_run_ "$2"
 374                 if [ "$?" = 0 -a "$eval_ret" = 0 ]
 375                 then
 376                         test_ok_ "$1"
 377                 else
 378                         test_failure_ "$@"
 379                 fi
 380         fi
 381         echo >&3 ""
 382 }
 383
 384 test_expect_code () {
 385         test "$#" = 4 && { prereq=$1; shift; } || prereq=
 386         test "$#" = 3 ||
 387         error "bug in the test script: not 3 or 4 parameters to test-expect-code"
 388         if ! test_skip "$@"
 389         then
 390                 say >&3 "expecting exit code $1: $3"
 391                 test_run_ "$3"
 392                 if [ "$?" = 0 -a "$eval_ret" = "$1" ]
 393                 then
 394                         test_ok_ "$2"
 395                 else
 396                         test_failure_ "$@"
 397                 fi
 398         fi
 399         echo >&3 ""
 400 }
 401
 402 # test_external runs external test scripts that provide continuous
 403 # test output about their progress, and succeeds/fails on
 404 # zero/non-zero exit code.  It outputs the test output on stdout even
 405 # in non-verbose mode, and announces the external script with "* run
 406 # <n>: ..." before running it.  When providing relative paths, keep in
 407 # mind that all scripts run in "trash directory".
 408 # Usage: test_external description command arguments...
 409 # Example: test_external 'Perl API' perl ../path/to/test.pl
 410 test_external () {
 411         test "$#" = 4 && { prereq=$1; shift; } || prereq=
 412         test "$#" = 3 ||
 413         error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
 414         descr="$1"
 415         shift
 416         if ! test_skip "$descr" "$@"
 417         then
 418                 # Announce the script to reduce confusion about the
 419                 # test output that follows.
 420                 say_color "" " run $test_count: $descr ($*)"
 421                 # Run command; redirect its stderr to &4 as in
 422                 # test_run_, but keep its stdout on our stdout even in
 423                 # non-verbose mode.
 424                 "$@" 2>&4
 425                 if [ "$?" = 0 ]
 426                 then
 427                         test_ok_ "$descr"
 428                 else
 429                         test_failure_ "$descr" "$@"
 430                 fi
 431         fi
 432 }
 433
 434 # Like test_external, but in addition tests that the command generated
 435 # no output on stderr.
 436 test_external_without_stderr () {
 437         # The temporary file has no (and must have no) security
 438         # implications.
 439         tmp="$TMPDIR"; if [ -z "$tmp" ]; then tmp=/tmp; fi
 440         stderr="$tmp/git-external-stderr.$$.tmp"
 441         test_external "$@" 4> "$stderr"
 442         [ -f "$stderr" ] || error "Internal error: $stderr disappeared."
 443         descr="no stderr: $1"
 444         shift
 445         say >&3 "expecting no stderr from previous command"
 446         if [ ! -s "$stderr" ]; then
 447                 rm "$stderr"
 448                 test_ok_ "$descr"
 449         else
 450                 if [ "$verbose" = t ]; then
 451                         output=`echo; echo Stderr is:; cat "$stderr"`
 452                 else
 453                         output=
 454                 fi
 455                 # rm first in case test_failure exits.
 456                 rm "$stderr"
 457                 test_failure_ "$descr" "$@" "$output"
 458         fi
 459 }
 460
 461 # This is not among top-level (test_expect_success | test_expect_failure)
 462 # but is a prefix that can be used in the test script, like:
 463 #
 464 #       test_expect_success 'complain and die' '
 465 #           do something &&
 466 #           do something else &&
 467 #           test_must_fail git checkout ../outerspace
 468 #       '
 469 #
 470 # Writing this as "! git checkout ../outerspace" is wrong, because
 471 # the failure could be due to a segv.  We want a controlled failure.
 472
 473 test_must_fail () {
 474         "$@"
 475         test $? -gt 0 -a $? -le 129 -o $? -gt 192
 476 }
 477
 478 # test_cmp is a helper function to compare actual and expected output.
 479 # You can use it like:
 480 #
 481 #       test_expect_success 'foo works' '
 482 #               echo expected >expected &&
 483 #               foo >actual &&
 484 #               test_cmp expected actual
 485 #       '
 486 #
 487 # This could be written as either "cmp" or "diff -u", but:
 488 # - cmp's output is not nearly as easy to read as diff -u
 489 # - not all diff versions understand "-u"
 490
 491 test_cmp() {
 492         $GIT_TEST_CMP "$@"
 493 }
 494
 495 # Most tests can use the created repository, but some may need to create more.
 496 # Usage: test_create_repo <directory>
 497 test_create_repo () {
 498         test "$#" = 1 ||
 499         error "bug in the test script: not 1 parameter to test-create-repo"
 500         owd=`pwd`
 501         repo="$1"
 502         mkdir -p "$repo"
 503         cd "$repo" || error "Cannot setup test environment"
 504         "$GIT_EXEC_PATH/git-init" "--template=$TEST_DIRECTORY/../templates/blt/" >&3 2>&4 ||
 505         error "cannot run git init -- have you built things yet?"
 506         mv .git/hooks .git/hooks-disabled
 507         cd "$owd"
 508 }
 509
 510 test_done () {
 511         GIT_EXIT_OK=t
 512         test_results_dir="$TEST_DIRECTORY/test-results"
 513         mkdir -p "$test_results_dir"
 514         test_results_path="$test_results_dir/${0%.sh}-$$"
 515
 516         echo "total $test_count" >> $test_results_path
 517         echo "success $test_success" >> $test_results_path
 518         echo "fixed $test_fixed" >> $test_results_path
 519         echo "broken $test_broken" >> $test_results_path
 520         echo "failed $test_failure" >> $test_results_path
 521         echo "" >> $test_results_path
 522
 523         if test "$test_fixed" != 0
 524         then
 525                 say_color pass "fixed $test_fixed known breakage(s)"
 526         fi
 527         if test "$test_broken" != 0
 528         then
 529                 say_color error "still have $test_broken known breakage(s)"
 530                 msg="remaining $(($test_count-$test_broken)) test(s)"
 531         else
 532                 msg="$test_count test(s)"
 533         fi
 534         case "$test_failure" in
 535         0)
 536                 say_color pass "passed all $msg"
 537
 538                 test -d "$remove_trash" &&
 539                 cd "$(dirname "$remove_trash")" &&
 540                 rm -rf "$(basename "$remove_trash")"
 541
 542                 exit 0 ;;
 543
 544         *)
 545                 say_color error "failed $test_failure among $msg"
 546                 exit 1 ;;
 547
 548         esac
 549 }
 550
 551 # Test the binaries we have just built.  The tests are kept in
 552 # t/ subdirectory and are run in 'trash directory' subdirectory.
 553 TEST_DIRECTORY=$(pwd)
 554 if test -z "$valgrind"
 555 then
 556         if test -z "$GIT_TEST_INSTALLED"
 557         then
 558                 PATH=$TEST_DIRECTORY/..:$PATH
 559                 GIT_EXEC_PATH=$TEST_DIRECTORY/..
 560         else
 561                 GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 562                 error "Cannot run git from $GIT_TEST_INSTALLED."
 563                 PATH=$GIT_TEST_INSTALLED:$TEST_DIRECTORY/..:$PATH
 564                 GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 565         fi
 566 else
 567         make_symlink () {
 568                 test -h "$2" &&
 569                 test "$1" = "$(readlink "$2")" || {
 570                         # be super paranoid
 571                         if mkdir "$2".lock
 572                         then
 573                                 rm -f "$2" &&
 574                                 ln -s "$1" "$2" &&
 575                                 rm -r "$2".lock
 576                         else
 577                                 while test -d "$2".lock
 578                                 do
 579                                         say "Waiting for lock on $2."
 580                                         sleep 1
 581                                 done
 582                         fi
 583                 }
 584         }
 585
 586         make_valgrind_symlink () {
 587                 # handle only executables
 588                 test -x "$1" || return
 589
 590                 base=$(basename "$1")
 591                 symlink_target=$TEST_DIRECTORY/../$base
 592                 # do not override scripts
 593                 if test -x "$symlink_target" &&
 594                     test ! -d "$symlink_target" &&
 595                     test "#!" != "$(head -c 2 < "$symlink_target")"
 596                 then
 597                         symlink_target=../valgrind.sh
 598                 fi
 599                 case "$base" in
 600                 *.sh|*.perl)
 601                         symlink_target=../unprocessed-script
 602                 esac
 603                 # create the link, or replace it if it is out of date
 604                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
 605         }
 606
 607         # override all git executables in TEST_DIRECTORY/..
 608         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
 609         mkdir -p "$GIT_VALGRIND"/bin
 610         for file in $TEST_DIRECTORY/../git* $TEST_DIRECTORY/../test-*
 611         do
 612                 make_valgrind_symlink $file
 613         done
 614         OLDIFS=$IFS
 615         IFS=:
 616         for path in $PATH
 617         do
 618                 ls "$path"/git-* 2> /dev/null |
 619                 while read file
 620                 do
 621                         make_valgrind_symlink "$file"
 622                 done
 623         done
 624         IFS=$OLDIFS
 625         PATH=$GIT_VALGRIND/bin:$PATH
 626         GIT_EXEC_PATH=$GIT_VALGRIND/bin
 627         export GIT_VALGRIND
 628 fi
 629 GIT_TEMPLATE_DIR=$(pwd)/../templates/blt
 630 unset GIT_CONFIG
 631 GIT_CONFIG_NOSYSTEM=1
 632 GIT_CONFIG_NOGLOBAL=1
 633 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_CONFIG_NOGLOBAL
 634
 635 GITPERLLIB=$(pwd)/../perl/blib/lib:$(pwd)/../perl/blib/arch/auto/Git
 636 export GITPERLLIB
 637 test -d ../templates/blt || {
 638         error "You haven't built things yet, have you?"
 639 }
 640
 641 if ! test -x ../test-chmtime; then
 642         echo >&2 'You need to build test-chmtime:'
 643         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 644         exit 1
 645 fi
 646
 647 . ../GIT-BUILD-OPTIONS
 648
 649 # Test repository
 650 test="trash directory.$(basename "$0" .sh)"
 651 test -n "$root" && test="$root/$test"
 652 case "$test" in
 653 /*) TRASH_DIRECTORY="$test" ;;
 654  *) TRASH_DIRECTORY="$TEST_DIRECTORY/$test" ;;
 655 esac
 656 test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
 657 rm -fr "$test" || {
 658         GIT_EXIT_OK=t
 659         echo >&5 "FATAL: Cannot prepare test area"
 660         exit 1
 661 }
 662
 663 test_create_repo "$test"
 664 # Use -P to resolve symlinks in our working directory so that the cwd
 665 # in subprocesses like git equals our $PWD (for pathname comparisons).
 666 cd -P "$test" || exit 1
 667
 668 this_test=${0##*/}
 669 this_test=${this_test%%-*}
 670 for skp in $GIT_SKIP_TESTS
 671 do
 672         to_skip=
 673         for skp in $GIT_SKIP_TESTS
 674         do
 675                 case "$this_test" in
 676                 $skp)
 677                         to_skip=t
 678                 esac
 679         done
 680         case "$to_skip" in
 681         t)
 682                 say_color skip >&3 "skipping test $this_test altogether"
 683                 say_color skip "skip all tests in $this_test"
 684                 test_done
 685         esac
 686 done
 687
 688 # Fix some commands on Windows
 689 case $(uname -s) in
 690 *MINGW*)
 691         # Windows has its own (incompatible) sort and find
 692         sort () {
 693                 /usr/bin/sort "$@"
 694         }
 695         find () {
 696                 /usr/bin/find "$@"
 697         }
 698         sum () {
 699                 md5sum "$@"
 700         }
 701         # git sees Windows-style pwd
 702         pwd () {
 703                 builtin pwd -W
 704         }
 705         # no POSIX permissions
 706         # backslashes in pathspec are converted to '/'
 707         # exec does not inherit the PID
 708         ;;
 709 *)
 710         test_set_prereq POSIXPERM
 711         test_set_prereq BSLASHPSPEC
 712         test_set_prereq EXECKEEPSPID
 713         ;;
 714 esac
 715
 716 test -z "$NO_PERL" && test_set_prereq PERL
 717
 718 # test whether the filesystem supports symbolic links
 719 ln -s x y 2>/dev/null && test -h y 2>/dev/null && test_set_prereq SYMLINKS
 720 rm -f y