t/test-lib.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5 # This program is free software: you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation, either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see http://www.gnu.org/licenses/ .
  17
  18 # if --tee was passed, write the output not only to the terminal, but
  19 # additionally to the file test-results/$BASENAME.out, too.
  20 case "$GIT_TEST_TEE_STARTED, $* " in
  21 done,*)
  22         # do not redirect again
  23         ;;
  24 *' --tee '*|*' --va'*)
  25         mkdir -p test-results
  26         BASE=test-results/$(basename "$0" .sh)
  27         (GIT_TEST_TEE_STARTED=done ${SHELL-sh} "$0" "$@" 2>&1;
  28          echo $? > $BASE.exit) | tee $BASE.out
  29         test "$(cat $BASE.exit)" = 0
  30         exit
  31         ;;
  32 esac
  33
  34 # Keep the original TERM for say_color
  35 ORIGINAL_TERM=$TERM
  36
  37 # Test the binaries we have just built.  The tests are kept in
  38 # t/ subdirectory and are run in 'trash directory' subdirectory.
  39 if test -z "$TEST_DIRECTORY"
  40 then
  41         # We allow tests to override this, in case they want to run tests
  42         # outside of t/, e.g. for running tests on the test library
  43         # itself.
  44         TEST_DIRECTORY=$(pwd)
  45 fi
  46 if test -z "$TEST_OUTPUT_DIRECTORY"
  47 then
  48         # Similarly, override this to store the test-results subdir
  49         # elsewhere
  50         TEST_OUTPUT_DIRECTORY=$TEST_DIRECTORY
  51 fi
  52 GIT_BUILD_DIR="$TEST_DIRECTORY"/..
  53
  54 . "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
  55 export PERL_PATH SHELL_PATH
  56
  57 # For repeatability, reset the environment to known value.
  58 LANG=C
  59 LC_ALL=C
  60 PAGER=cat
  61 TZ=UTC
  62 TERM=dumb
  63 export LANG LC_ALL PAGER TERM TZ
  64 EDITOR=:
  65 # A call to "unset" with no arguments causes at least Solaris 10
  66 # /usr/xpg4/bin/sh and /bin/ksh to bail out.  So keep the unsets
  67 # deriving from the command substitution clustered with the other
  68 # ones.
  69 unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
  70         my @env = keys %ENV;
  71         my $ok = join("|", qw(
  72                 TRACE
  73                 DEBUG
  74                 USE_LOOKUP
  75                 TEST
  76                 .*_TEST
  77                 PROVE
  78                 VALGRIND
  79                 PERF_AGGREGATING_LATER
  80         ));
  81         my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
  82         print join("\n", @vars);
  83 ')
  84 unset XDG_CONFIG_HOME
  85 GIT_AUTHOR_EMAIL=author@example.com
  86 GIT_AUTHOR_NAME='A U Thor'
  87 GIT_COMMITTER_EMAIL=committer@example.com
  88 GIT_COMMITTER_NAME='C O Mitter'
  89 GIT_MERGE_VERBOSITY=5
  90 GIT_MERGE_AUTOEDIT=no
  91 export GIT_MERGE_VERBOSITY GIT_MERGE_AUTOEDIT
  92 export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
  93 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
  94 export EDITOR
  95
  96 # Add libc MALLOC and MALLOC_PERTURB test
  97 # only if we are not executing the test with valgrind
  98 expr "$GIT_TEST_OPTS" : ".*\(--valgrind\)" >/dev/null || {
  99         MALLOC_CHECK_=3
 100         export MALLOC_CHECK_
 101         MALLOC_PERTURB_="$( expr \( $$ % 255 \) + 1)"
 102         export MALLOC_PERTURB_
 103 }
 104
 105 # Protect ourselves from common misconfiguration to export
 106 # CDPATH into the environment
 107 unset CDPATH
 108
 109 unset GREP_OPTIONS
 110
 111 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
 112 1|2|true)
 113         echo "* warning: Some tests will not work if GIT_TRACE" \
 114                 "is set as to trace on STDERR ! *"
 115         echo "* warning: Please set GIT_TRACE to something" \
 116                 "other than 1, 2 or true ! *"
 117         ;;
 118 esac
 119
 120 # Convenience
 121 #
 122 # A regexp to match 5 and 40 hexdigits
 123 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 124 _x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
 125
 126 # Zero SHA-1
 127 _z40=0000000000000000000000000000000000000000
 128
 129 # Line feed
 130 LF='
 131 '
 132
 133 export _x05 _x40 _z40 LF
 134
 135 # Each test should start with something like this, after copyright notices:
 136 #
 137 # test_description='Description of this test...
 138 # This test checks if command xyzzy does the right thing...
 139 # '
 140 # . ./test-lib.sh
 141 [ "x$ORIGINAL_TERM" != "xdumb" ] && (
 142                 TERM=$ORIGINAL_TERM &&
 143                 export TERM &&
 144                 [ -t 1 ] &&
 145                 tput bold >/dev/null 2>&1 &&
 146                 tput setaf 1 >/dev/null 2>&1 &&
 147                 tput sgr0 >/dev/null 2>&1
 148         ) &&
 149         color=t
 150
 151 while test "$#" -ne 0
 152 do
 153         case "$1" in
 154         -d|--d|--de|--deb|--debu|--debug)
 155                 debug=t; shift ;;
 156         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
 157                 immediate=t; shift ;;
 158         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 159                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 160         -h|--h|--he|--hel|--help)
 161                 help=t; shift ;;
 162         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
 163                 verbose=t; shift ;;
 164         -q|--q|--qu|--qui|--quie|--quiet)
 165                 # Ignore --quiet under a TAP::Harness. Saying how many tests
 166                 # passed without the ok/not ok details is always an error.
 167                 test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
 168         --with-dashes)
 169                 with_dashes=t; shift ;;
 170         --no-color)
 171                 color=; shift ;;
 172         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 173                 valgrind=t; verbose=t; shift ;;
 174         --tee)
 175                 shift ;; # was handled already
 176         --root=*)
 177                 root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 178                 shift ;;
 179         *)
 180                 echo "error: unknown test option '$1'" >&2; exit 1 ;;
 181         esac
 182 done
 183
 184 if test -n "$color"
 185 then
 186         say_color () {
 187                 (
 188                 TERM=$ORIGINAL_TERM
 189                 export TERM
 190                 case "$1" in
 191                 error)
 192                         tput bold; tput setaf 1;; # bold red
 193                 skip)
 194                         tput bold; tput setaf 2;; # bold green
 195                 pass)
 196                         tput setaf 2;;            # green
 197                 info)
 198                         tput setaf 3;;            # brown
 199                 *)
 200                         test -n "$quiet" && return;;
 201                 esac
 202                 shift
 203                 printf "%s" "$*"
 204                 tput sgr0
 205                 echo
 206                 )
 207         }
 208 else
 209         say_color() {
 210                 test -z "$1" && test -n "$quiet" && return
 211                 shift
 212                 echo "$*"
 213         }
 214 fi
 215
 216 error () {
 217         say_color error "error: $*"
 218         GIT_EXIT_OK=t
 219         exit 1
 220 }
 221
 222 say () {
 223         say_color info "$*"
 224 }
 225
 226 test "${test_description}" != "" ||
 227 error "Test script did not set test_description."
 228
 229 if test "$help" = "t"
 230 then
 231         echo "$test_description"
 232         exit 0
 233 fi
 234
 235 exec 5>&1
 236 exec 6<&0
 237 if test "$verbose" = "t"
 238 then
 239         exec 4>&2 3>&1
 240 else
 241         exec 4>/dev/null 3>/dev/null
 242 fi
 243
 244 test_failure=0
 245 test_count=0
 246 test_fixed=0
 247 test_broken=0
 248 test_success=0
 249
 250 test_external_has_tap=0
 251
 252 die () {
 253         code=$?
 254         if test -n "$GIT_EXIT_OK"
 255         then
 256                 exit $code
 257         else
 258                 echo >&5 "FATAL: Unexpected exit with code $code"
 259                 exit 1
 260         fi
 261 }
 262
 263 GIT_EXIT_OK=
 264 trap 'die' EXIT
 265
 266 # The user-facing functions are loaded from a separate file so that
 267 # test_perf subshells can have them too
 268 . "$TEST_DIRECTORY/test-lib-functions.sh"
 269
 270 # You are not expected to call test_ok_ and test_failure_ directly, use
 271 # the text_expect_* functions instead.
 272
 273 test_ok_ () {
 274         test_success=$(($test_success + 1))
 275         say_color "" "ok $test_count - $@"
 276 }
 277
 278 test_failure_ () {
 279         test_failure=$(($test_failure + 1))
 280         say_color error "not ok - $test_count $1"
 281         shift
 282         echo "$@" | sed -e 's/^/#       /'
 283         test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
 284 }
 285
 286 test_known_broken_ok_ () {
 287         test_fixed=$(($test_fixed+1))
 288         say_color "" "ok $test_count - $@ # TODO known breakage"
 289 }
 290
 291 test_known_broken_failure_ () {
 292         test_broken=$(($test_broken+1))
 293         say_color skip "not ok $test_count - $@ # TODO known breakage"
 294 }
 295
 296 test_debug () {
 297         test "$debug" = "" || eval "$1"
 298 }
 299
 300 test_eval_ () {
 301         # This is a separate function because some tests use
 302         # "return" to end a test_expect_success block early.
 303         eval </dev/null >&3 2>&4 "$*"
 304 }
 305
 306 test_run_ () {
 307         test_cleanup=:
 308         expecting_failure=$2
 309         test_eval_ "$1"
 310         eval_ret=$?
 311
 312         if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"
 313         then
 314                 test_eval_ "$test_cleanup"
 315         fi
 316         if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"
 317         then
 318                 echo ""
 319         fi
 320         return "$eval_ret"
 321 }
 322
 323 test_skip () {
 324         test_count=$(($test_count+1))
 325         to_skip=
 326         for skp in $GIT_SKIP_TESTS
 327         do
 328                 case $this_test.$test_count in
 329                 $skp)
 330                         to_skip=t
 331                         break
 332                 esac
 333         done
 334         if test -z "$to_skip" && test -n "$test_prereq" &&
 335            ! test_have_prereq "$test_prereq"
 336         then
 337                 to_skip=t
 338         fi
 339         case "$to_skip" in
 340         t)
 341                 of_prereq=
 342                 if test "$missing_prereq" != "$test_prereq"
 343                 then
 344                         of_prereq=" of $test_prereq"
 345                 fi
 346
 347                 say_color skip >&3 "skipping test: $@"
 348                 say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
 349                 : true
 350                 ;;
 351         *)
 352                 false
 353                 ;;
 354         esac
 355 }
 356
 357 # stub; perf-lib overrides it
 358 test_at_end_hook_ () {
 359         :
 360 }
 361
 362 test_done () {
 363         GIT_EXIT_OK=t
 364
 365         if test -z "$HARNESS_ACTIVE"
 366         then
 367                 test_results_dir="$TEST_OUTPUT_DIRECTORY/test-results"
 368                 mkdir -p "$test_results_dir"
 369                 test_results_path="$test_results_dir/${0%.sh}-$$.counts"
 370
 371                 cat >>"$test_results_path" <<-EOF
 372                 total $test_count
 373                 success $test_success
 374                 fixed $test_fixed
 375                 broken $test_broken
 376                 failed $test_failure
 377
 378                 EOF
 379         fi
 380
 381         if test "$test_fixed" != 0
 382         then
 383                 say_color pass "# fixed $test_fixed known breakage(s)"
 384         fi
 385         if test "$test_broken" != 0
 386         then
 387                 say_color error "# still have $test_broken known breakage(s)"
 388                 msg="remaining $(($test_count-$test_broken)) test(s)"
 389         else
 390                 msg="$test_count test(s)"
 391         fi
 392         case "$test_failure" in
 393         0)
 394                 # Maybe print SKIP message
 395                 if test -n "$skip_all" && test $test_count -gt 0
 396                 then
 397                         error "Can't use skip_all after running some tests"
 398                 fi
 399                 [ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
 400
 401                 if test $test_external_has_tap -eq 0
 402                 then
 403                         if test $test_count -gt 0
 404                         then
 405                                 say_color pass "# passed all $msg"
 406                         fi
 407                         say "1..$test_count$skip_all"
 408                 fi
 409
 410                 test -d "$remove_trash" &&
 411                 cd "$(dirname "$remove_trash")" &&
 412                 rm -rf "$(basename "$remove_trash")"
 413
 414                 test_at_end_hook_
 415
 416                 exit 0 ;;
 417
 418         *)
 419                 if test $test_external_has_tap -eq 0
 420                 then
 421                         say_color error "# failed $test_failure among $msg"
 422                         say "1..$test_count"
 423                 fi
 424
 425                 exit 1 ;;
 426
 427         esac
 428 }
 429
 430 if test -n "$valgrind"
 431 then
 432         make_symlink () {
 433                 test -h "$2" &&
 434                 test "$1" = "$(readlink "$2")" || {
 435                         # be super paranoid
 436                         if mkdir "$2".lock
 437                         then
 438                                 rm -f "$2" &&
 439                                 ln -s "$1" "$2" &&
 440                                 rm -r "$2".lock
 441                         else
 442                                 while test -d "$2".lock
 443                                 do
 444                                         say "Waiting for lock on $2."
 445                                         sleep 1
 446                                 done
 447                         fi
 448                 }
 449         }
 450
 451         make_valgrind_symlink () {
 452                 # handle only executables, unless they are shell libraries that
 453                 # need to be in the exec-path.  We will just use "#!" as a
 454                 # guess for a shell-script, since we have no idea what the user
 455                 # may have configured as the shell path.
 456                 test -x "$1" ||
 457                 test "#!" = "$(head -c 2 <"$1")" ||
 458                 return;
 459
 460                 base=$(basename "$1")
 461                 symlink_target=$GIT_BUILD_DIR/$base
 462                 # do not override scripts
 463                 if test -x "$symlink_target" &&
 464                     test ! -d "$symlink_target" &&
 465                     test "#!" != "$(head -c 2 < "$symlink_target")"
 466                 then
 467                         symlink_target=../valgrind.sh
 468                 fi
 469                 case "$base" in
 470                 *.sh|*.perl)
 471                         symlink_target=../unprocessed-script
 472                 esac
 473                 # create the link, or replace it if it is out of date
 474                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
 475         }
 476
 477         # override all git executables in TEST_DIRECTORY/..
 478         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
 479         mkdir -p "$GIT_VALGRIND"/bin
 480         for file in $GIT_BUILD_DIR/git* $GIT_BUILD_DIR/test-*
 481         do
 482                 make_valgrind_symlink $file
 483         done
 484         # special-case the mergetools loadables
 485         make_symlink "$GIT_BUILD_DIR"/mergetools "$GIT_VALGRIND/bin/mergetools"
 486         OLDIFS=$IFS
 487         IFS=:
 488         for path in $PATH
 489         do
 490                 ls "$path"/git-* 2> /dev/null |
 491                 while read file
 492                 do
 493                         make_valgrind_symlink "$file"
 494                 done
 495         done
 496         IFS=$OLDIFS
 497         PATH=$GIT_VALGRIND/bin:$PATH
 498         GIT_EXEC_PATH=$GIT_VALGRIND/bin
 499         export GIT_VALGRIND
 500 elif test -n "$GIT_TEST_INSTALLED"
 501 then
 502         GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 503         error "Cannot run git from $GIT_TEST_INSTALLED."
 504         PATH=$GIT_TEST_INSTALLED:$GIT_BUILD_DIR:$PATH
 505         GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 506 else # normal case, use ../bin-wrappers only unless $with_dashes:
 507         git_bin_dir="$GIT_BUILD_DIR/bin-wrappers"
 508         if ! test -x "$git_bin_dir/git"
 509         then
 510                 if test -z "$with_dashes"
 511                 then
 512                         say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
 513                 fi
 514                 with_dashes=t
 515         fi
 516         PATH="$git_bin_dir:$PATH"
 517         GIT_EXEC_PATH=$GIT_BUILD_DIR
 518         if test -n "$with_dashes"
 519         then
 520                 PATH="$GIT_BUILD_DIR:$PATH"
 521         fi
 522 fi
 523 GIT_TEMPLATE_DIR="$GIT_BUILD_DIR"/templates/blt
 524 unset GIT_CONFIG
 525 GIT_CONFIG_NOSYSTEM=1
 526 GIT_ATTR_NOSYSTEM=1
 527 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_ATTR_NOSYSTEM
 528
 529 if test -z "$GIT_TEST_CMP"
 530 then
 531         if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
 532         then
 533                 GIT_TEST_CMP="$DIFF -c"
 534         else
 535                 GIT_TEST_CMP="$DIFF -u"
 536         fi
 537 fi
 538
 539 GITPERLLIB="$GIT_BUILD_DIR"/perl/blib/lib:"$GIT_BUILD_DIR"/perl/blib/arch/auto/Git
 540 export GITPERLLIB
 541 test -d "$GIT_BUILD_DIR"/templates/blt || {
 542         error "You haven't built things yet, have you?"
 543 }
 544
 545 if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
 546 then
 547         GITPYTHONLIB="$GIT_BUILD_DIR/git_remote_helpers/build/lib"
 548         export GITPYTHONLIB
 549         test -d "$GIT_BUILD_DIR"/git_remote_helpers/build || {
 550                 error "You haven't built git_remote_helpers yet, have you?"
 551         }
 552 fi
 553
 554 if ! test -x "$GIT_BUILD_DIR"/test-chmtime
 555 then
 556         echo >&2 'You need to build test-chmtime:'
 557         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 558         exit 1
 559 fi
 560
 561 # Test repository
 562 test="trash directory.$(basename "$0" .sh)"
 563 test -n "$root" && test="$root/$test"
 564 case "$test" in
 565 /*) TRASH_DIRECTORY="$test" ;;
 566  *) TRASH_DIRECTORY="$TEST_OUTPUT_DIRECTORY/$test" ;;
 567 esac
 568 test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
 569 rm -fr "$test" || {
 570         GIT_EXIT_OK=t
 571         echo >&5 "FATAL: Cannot prepare test area"
 572         exit 1
 573 }
 574
 575 HOME="$TRASH_DIRECTORY"
 576 export HOME
 577
 578 if test -z "$TEST_NO_CREATE_REPO"
 579 then
 580         test_create_repo "$test"
 581 else
 582         mkdir -p "$test"
 583 fi
 584 # Use -P to resolve symlinks in our working directory so that the cwd
 585 # in subprocesses like git equals our $PWD (for pathname comparisons).
 586 cd -P "$test" || exit 1
 587
 588 this_test=${0##*/}
 589 this_test=${this_test%%-*}
 590 for skp in $GIT_SKIP_TESTS
 591 do
 592         case "$this_test" in
 593         $skp)
 594                 say_color skip >&3 "skipping test $this_test altogether"
 595                 skip_all="skip all tests in $this_test"
 596                 test_done
 597         esac
 598 done
 599
 600 # Provide an implementation of the 'yes' utility
 601 yes () {
 602         if test $# = 0
 603         then
 604                 y=y
 605         else
 606                 y="$*"
 607         fi
 608
 609         while echo "$y"
 610         do
 611                 :
 612         done
 613 }
 614
 615 # Fix some commands on Windows
 616 case $(uname -s) in
 617 *MINGW*)
 618         # Windows has its own (incompatible) sort and find
 619         sort () {
 620                 /usr/bin/sort "$@"
 621         }
 622         find () {
 623                 /usr/bin/find "$@"
 624         }
 625         sum () {
 626                 md5sum "$@"
 627         }
 628         # git sees Windows-style pwd
 629         pwd () {
 630                 builtin pwd -W
 631         }
 632         # no POSIX permissions
 633         # backslashes in pathspec are converted to '/'
 634         # exec does not inherit the PID
 635         test_set_prereq MINGW
 636         test_set_prereq SED_STRIPS_CR
 637         ;;
 638 *CYGWIN*)
 639         test_set_prereq POSIXPERM
 640         test_set_prereq EXECKEEPSPID
 641         test_set_prereq NOT_MINGW
 642         test_set_prereq SED_STRIPS_CR
 643         ;;
 644 *)
 645         test_set_prereq POSIXPERM
 646         test_set_prereq BSLASHPSPEC
 647         test_set_prereq EXECKEEPSPID
 648         test_set_prereq NOT_MINGW
 649         ;;
 650 esac
 651
 652 ( COLUMNS=1 && test $COLUMNS = 1 ) && test_set_prereq COLUMNS_CAN_BE_1
 653 test -z "$NO_PERL" && test_set_prereq PERL
 654 test -z "$NO_PYTHON" && test_set_prereq PYTHON
 655 test -n "$USE_LIBPCRE" && test_set_prereq LIBPCRE
 656 test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
 657
 658 # Can we rely on git's output in the C locale?
 659 if test -n "$GETTEXT_POISON"
 660 then
 661         GIT_GETTEXT_POISON=YesPlease
 662         export GIT_GETTEXT_POISON
 663         test_set_prereq GETTEXT_POISON
 664 else
 665         test_set_prereq C_LOCALE_OUTPUT
 666 fi
 667
 668 # Use this instead of test_cmp to compare files that contain expected and
 669 # actual output from git commands that can be translated.  When running
 670 # under GETTEXT_POISON this pretends that the command produced expected
 671 # results.
 672 test_i18ncmp () {
 673         test -n "$GETTEXT_POISON" || test_cmp "$@"
 674 }
 675
 676 # Use this instead of "grep expected-string actual" to see if the
 677 # output from a git command that can be translated either contains an
 678 # expected string, or does not contain an unwanted one.  When running
 679 # under GETTEXT_POISON this pretends that the command produced expected
 680 # results.
 681 test_i18ngrep () {
 682         if test -n "$GETTEXT_POISON"
 683         then
 684             : # pretend success
 685         elif test "x!" = "x$1"
 686         then
 687                 shift
 688                 ! grep "$@"
 689         else
 690                 grep "$@"
 691         fi
 692 }
 693
 694 test_lazy_prereq SYMLINKS '
 695         # test whether the filesystem supports symbolic links
 696         ln -s x y && test -h y
 697 '
 698
 699 test_lazy_prereq CASE_INSENSITIVE_FS '
 700         echo good >CamelCase &&
 701         echo bad >camelcase &&
 702         test "$(cat CamelCase)" != good
 703 '
 704
 705 test_lazy_prereq UTF8_NFD_TO_NFC '
 706         # check whether FS converts nfd unicode to nfc
 707         auml=$(printf "\303\244")
 708         aumlcdiar=$(printf "\141\314\210")
 709         >"$auml" &&
 710         case "$(echo *)" in
 711         "$aumlcdiar")
 712                 true ;;
 713         *)
 714                 false ;;
 715         esac
 716 '
 717
 718 # When the tests are run as root, permission tests will report that
 719 # things are writable when they shouldn't be.
 720 test -w / || test_set_prereq SANITY