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 if expr " $GIT_TEST_OPTS " : ".* --valgrind " >/dev/null ||
  99    test -n "$TEST_NO_MALLOC_CHECK"
 100 then
 101         setup_malloc_check () {
 102                 : nothing
 103         }
 104         teardown_malloc_check () {
 105                 : nothing
 106         }
 107 else
 108         setup_malloc_check () {
 109                 MALLOC_CHECK_=3 MALLOC_PERTURB_=165
 110                 export MALLOC_CHECK_ MALLOC_PERTURB_
 111         }
 112         teardown_malloc_check () {
 113                 unset MALLOC_CHECK_ MALLOC_PERTURB_
 114         }
 115 fi
 116
 117 # Protect ourselves from common misconfiguration to export
 118 # CDPATH into the environment
 119 unset CDPATH
 120
 121 unset GREP_OPTIONS
 122
 123 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
 124 1|2|true)
 125         echo "* warning: Some tests will not work if GIT_TRACE" \
 126                 "is set as to trace on STDERR ! *"
 127         echo "* warning: Please set GIT_TRACE to something" \
 128                 "other than 1, 2 or true ! *"
 129         ;;
 130 esac
 131
 132 # Convenience
 133 #
 134 # A regexp to match 5 and 40 hexdigits
 135 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 136 _x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
 137
 138 # Zero SHA-1
 139 _z40=0000000000000000000000000000000000000000
 140
 141 # Line feed
 142 LF='
 143 '
 144
 145 export _x05 _x40 _z40 LF
 146
 147 # Each test should start with something like this, after copyright notices:
 148 #
 149 # test_description='Description of this test...
 150 # This test checks if command xyzzy does the right thing...
 151 # '
 152 # . ./test-lib.sh
 153 [ "x$ORIGINAL_TERM" != "xdumb" ] && (
 154                 TERM=$ORIGINAL_TERM &&
 155                 export TERM &&
 156                 [ -t 1 ] &&
 157                 tput bold >/dev/null 2>&1 &&
 158                 tput setaf 1 >/dev/null 2>&1 &&
 159                 tput sgr0 >/dev/null 2>&1
 160         ) &&
 161         color=t
 162
 163 while test "$#" -ne 0
 164 do
 165         case "$1" in
 166         -d|--d|--de|--deb|--debu|--debug)
 167                 debug=t; shift ;;
 168         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
 169                 immediate=t; shift ;;
 170         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 171                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 172         -h|--h|--he|--hel|--help)
 173                 help=t; shift ;;
 174         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
 175                 verbose=t; shift ;;
 176         -q|--q|--qu|--qui|--quie|--quiet)
 177                 # Ignore --quiet under a TAP::Harness. Saying how many tests
 178                 # passed without the ok/not ok details is always an error.
 179                 test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
 180         --with-dashes)
 181                 with_dashes=t; shift ;;
 182         --no-color)
 183                 color=; shift ;;
 184         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 185                 valgrind=t; verbose=t; shift ;;
 186         --tee)
 187                 shift ;; # was handled already
 188         --root=*)
 189                 root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 190                 shift ;;
 191         *)
 192                 echo "error: unknown test option '$1'" >&2; exit 1 ;;
 193         esac
 194 done
 195
 196 if test -n "$color"
 197 then
 198         say_color () {
 199                 (
 200                 TERM=$ORIGINAL_TERM
 201                 export TERM
 202                 case "$1" in
 203                 error)
 204                         tput bold; tput setaf 1;; # bold red
 205                 skip)
 206                         tput bold; tput setaf 2;; # bold green
 207                 pass)
 208                         tput setaf 2;;            # green
 209                 info)
 210                         tput setaf 3;;            # brown
 211                 *)
 212                         test -n "$quiet" && return;;
 213                 esac
 214                 shift
 215                 printf "%s" "$*"
 216                 tput sgr0
 217                 echo
 218                 )
 219         }
 220 else
 221         say_color() {
 222                 test -z "$1" && test -n "$quiet" && return
 223                 shift
 224                 echo "$*"
 225         }
 226 fi
 227
 228 error () {
 229         say_color error "error: $*"
 230         GIT_EXIT_OK=t
 231         exit 1
 232 }
 233
 234 say () {
 235         say_color info "$*"
 236 }
 237
 238 test "${test_description}" != "" ||
 239 error "Test script did not set test_description."
 240
 241 if test "$help" = "t"
 242 then
 243         echo "$test_description"
 244         exit 0
 245 fi
 246
 247 exec 5>&1
 248 exec 6<&0
 249 if test "$verbose" = "t"
 250 then
 251         exec 4>&2 3>&1
 252 else
 253         exec 4>/dev/null 3>/dev/null
 254 fi
 255
 256 test_failure=0
 257 test_count=0
 258 test_fixed=0
 259 test_broken=0
 260 test_success=0
 261
 262 test_external_has_tap=0
 263
 264 die () {
 265         code=$?
 266         if test -n "$GIT_EXIT_OK"
 267         then
 268                 exit $code
 269         else
 270                 echo >&5 "FATAL: Unexpected exit with code $code"
 271                 exit 1
 272         fi
 273 }
 274
 275 GIT_EXIT_OK=
 276 trap 'die' EXIT
 277
 278 # The user-facing functions are loaded from a separate file so that
 279 # test_perf subshells can have them too
 280 . "$TEST_DIRECTORY/test-lib-functions.sh"
 281
 282 # You are not expected to call test_ok_ and test_failure_ directly, use
 283 # the text_expect_* functions instead.
 284
 285 test_ok_ () {
 286         test_success=$(($test_success + 1))
 287         say_color "" "ok $test_count - $@"
 288 }
 289
 290 test_failure_ () {
 291         test_failure=$(($test_failure + 1))
 292         say_color error "not ok - $test_count $1"
 293         shift
 294         echo "$@" | sed -e 's/^/#       /'
 295         test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
 296 }
 297
 298 test_known_broken_ok_ () {
 299         test_fixed=$(($test_fixed+1))
 300         say_color "" "ok $test_count - $@ # TODO known breakage"
 301 }
 302
 303 test_known_broken_failure_ () {
 304         test_broken=$(($test_broken+1))
 305         say_color skip "not ok $test_count - $@ # TODO known breakage"
 306 }
 307
 308 test_debug () {
 309         test "$debug" = "" || eval "$1"
 310 }
 311
 312 test_eval_ () {
 313         # This is a separate function because some tests use
 314         # "return" to end a test_expect_success block early.
 315         eval </dev/null >&3 2>&4 "$*"
 316 }
 317
 318 test_run_ () {
 319         test_cleanup=:
 320         expecting_failure=$2
 321         test_eval_ "$1"
 322         eval_ret=$?
 323
 324         if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"
 325         then
 326                 setup_malloc_check
 327                 test_eval_ "$test_cleanup"
 328                 teardown_malloc_check
 329         fi
 330         if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"
 331         then
 332                 echo ""
 333         fi
 334         return "$eval_ret"
 335 }
 336
 337 test_skip () {
 338         test_count=$(($test_count+1))
 339         to_skip=
 340         for skp in $GIT_SKIP_TESTS
 341         do
 342                 case $this_test.$test_count in
 343                 $skp)
 344                         to_skip=t
 345                         break
 346                 esac
 347         done
 348         if test -z "$to_skip" && test -n "$test_prereq" &&
 349            ! test_have_prereq "$test_prereq"
 350         then
 351                 to_skip=t
 352         fi
 353         case "$to_skip" in
 354         t)
 355                 of_prereq=
 356                 if test "$missing_prereq" != "$test_prereq"
 357                 then
 358                         of_prereq=" of $test_prereq"
 359                 fi
 360
 361                 say_color skip >&3 "skipping test: $@"
 362                 say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
 363                 : true
 364                 ;;
 365         *)
 366                 false
 367                 ;;
 368         esac
 369 }
 370
 371 # stub; perf-lib overrides it
 372 test_at_end_hook_ () {
 373         :
 374 }
 375
 376 test_done () {
 377         GIT_EXIT_OK=t
 378
 379         if test -z "$HARNESS_ACTIVE"
 380         then
 381                 test_results_dir="$TEST_OUTPUT_DIRECTORY/test-results"
 382                 mkdir -p "$test_results_dir"
 383                 test_results_path="$test_results_dir/${0%.sh}-$$.counts"
 384
 385                 cat >>"$test_results_path" <<-EOF
 386                 total $test_count
 387                 success $test_success
 388                 fixed $test_fixed
 389                 broken $test_broken
 390                 failed $test_failure
 391
 392                 EOF
 393         fi
 394
 395         if test "$test_fixed" != 0
 396         then
 397                 say_color pass "# fixed $test_fixed known breakage(s)"
 398         fi
 399         if test "$test_broken" != 0
 400         then
 401                 say_color error "# still have $test_broken known breakage(s)"
 402                 msg="remaining $(($test_count-$test_broken)) test(s)"
 403         else
 404                 msg="$test_count test(s)"
 405         fi
 406         case "$test_failure" in
 407         0)
 408                 # Maybe print SKIP message
 409                 if test -n "$skip_all" && test $test_count -gt 0
 410                 then
 411                         error "Can't use skip_all after running some tests"
 412                 fi
 413                 [ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
 414
 415                 if test $test_external_has_tap -eq 0
 416                 then
 417                         if test $test_count -gt 0
 418                         then
 419                                 say_color pass "# passed all $msg"
 420                         fi
 421                         say "1..$test_count$skip_all"
 422                 fi
 423
 424                 test -d "$remove_trash" &&
 425                 cd "$(dirname "$remove_trash")" &&
 426                 rm -rf "$(basename "$remove_trash")"
 427
 428                 test_at_end_hook_
 429
 430                 exit 0 ;;
 431
 432         *)
 433                 if test $test_external_has_tap -eq 0
 434                 then
 435                         say_color error "# failed $test_failure among $msg"
 436                         say "1..$test_count"
 437                 fi
 438
 439                 exit 1 ;;
 440
 441         esac
 442 }
 443
 444 if test -n "$valgrind"
 445 then
 446         make_symlink () {
 447                 test -h "$2" &&
 448                 test "$1" = "$(readlink "$2")" || {
 449                         # be super paranoid
 450                         if mkdir "$2".lock
 451                         then
 452                                 rm -f "$2" &&
 453                                 ln -s "$1" "$2" &&
 454                                 rm -r "$2".lock
 455                         else
 456                                 while test -d "$2".lock
 457                                 do
 458                                         say "Waiting for lock on $2."
 459                                         sleep 1
 460                                 done
 461                         fi
 462                 }
 463         }
 464
 465         make_valgrind_symlink () {
 466                 # handle only executables, unless they are shell libraries that
 467                 # need to be in the exec-path.  We will just use "#!" as a
 468                 # guess for a shell-script, since we have no idea what the user
 469                 # may have configured as the shell path.
 470                 test -x "$1" ||
 471                 test "#!" = "$(head -c 2 <"$1")" ||
 472                 return;
 473
 474                 base=$(basename "$1")
 475                 symlink_target=$GIT_BUILD_DIR/$base
 476                 # do not override scripts
 477                 if test -x "$symlink_target" &&
 478                     test ! -d "$symlink_target" &&
 479                     test "#!" != "$(head -c 2 < "$symlink_target")"
 480                 then
 481                         symlink_target=../valgrind.sh
 482                 fi
 483                 case "$base" in
 484                 *.sh|*.perl)
 485                         symlink_target=../unprocessed-script
 486                 esac
 487                 # create the link, or replace it if it is out of date
 488                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
 489         }
 490
 491         # override all git executables in TEST_DIRECTORY/..
 492         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
 493         mkdir -p "$GIT_VALGRIND"/bin
 494         for file in $GIT_BUILD_DIR/git* $GIT_BUILD_DIR/test-*
 495         do
 496                 make_valgrind_symlink $file
 497         done
 498         # special-case the mergetools loadables
 499         make_symlink "$GIT_BUILD_DIR"/mergetools "$GIT_VALGRIND/bin/mergetools"
 500         OLDIFS=$IFS
 501         IFS=:
 502         for path in $PATH
 503         do
 504                 ls "$path"/git-* 2> /dev/null |
 505                 while read file
 506                 do
 507                         make_valgrind_symlink "$file"
 508                 done
 509         done
 510         IFS=$OLDIFS
 511         PATH=$GIT_VALGRIND/bin:$PATH
 512         GIT_EXEC_PATH=$GIT_VALGRIND/bin
 513         export GIT_VALGRIND
 514 elif test -n "$GIT_TEST_INSTALLED"
 515 then
 516         GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 517         error "Cannot run git from $GIT_TEST_INSTALLED."
 518         PATH=$GIT_TEST_INSTALLED:$GIT_BUILD_DIR:$PATH
 519         GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 520 else # normal case, use ../bin-wrappers only unless $with_dashes:
 521         git_bin_dir="$GIT_BUILD_DIR/bin-wrappers"
 522         if ! test -x "$git_bin_dir/git"
 523         then
 524                 if test -z "$with_dashes"
 525                 then
 526                         say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
 527                 fi
 528                 with_dashes=t
 529         fi
 530         PATH="$git_bin_dir:$PATH"
 531         GIT_EXEC_PATH=$GIT_BUILD_DIR
 532         if test -n "$with_dashes"
 533         then
 534                 PATH="$GIT_BUILD_DIR:$PATH"
 535         fi
 536 fi
 537 GIT_TEMPLATE_DIR="$GIT_BUILD_DIR"/templates/blt
 538 unset GIT_CONFIG
 539 GIT_CONFIG_NOSYSTEM=1
 540 GIT_ATTR_NOSYSTEM=1
 541 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_ATTR_NOSYSTEM
 542
 543 if test -z "$GIT_TEST_CMP"
 544 then
 545         if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
 546         then
 547                 GIT_TEST_CMP="$DIFF -c"
 548         else
 549                 GIT_TEST_CMP="$DIFF -u"
 550         fi
 551 fi
 552
 553 GITPERLLIB="$GIT_BUILD_DIR"/perl/blib/lib:"$GIT_BUILD_DIR"/perl/blib/arch/auto/Git
 554 export GITPERLLIB
 555 test -d "$GIT_BUILD_DIR"/templates/blt || {
 556         error "You haven't built things yet, have you?"
 557 }
 558
 559 if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
 560 then
 561         GITPYTHONLIB="$GIT_BUILD_DIR/git_remote_helpers/build/lib"
 562         export GITPYTHONLIB
 563         test -d "$GIT_BUILD_DIR"/git_remote_helpers/build || {
 564                 error "You haven't built git_remote_helpers yet, have you?"
 565         }
 566 fi
 567
 568 if ! test -x "$GIT_BUILD_DIR"/test-chmtime
 569 then
 570         echo >&2 'You need to build test-chmtime:'
 571         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 572         exit 1
 573 fi
 574
 575 # Test repository
 576 test="trash directory.$(basename "$0" .sh)"
 577 test -n "$root" && test="$root/$test"
 578 case "$test" in
 579 /*) TRASH_DIRECTORY="$test" ;;
 580  *) TRASH_DIRECTORY="$TEST_OUTPUT_DIRECTORY/$test" ;;
 581 esac
 582 test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
 583 rm -fr "$test" || {
 584         GIT_EXIT_OK=t
 585         echo >&5 "FATAL: Cannot prepare test area"
 586         exit 1
 587 }
 588
 589 HOME="$TRASH_DIRECTORY"
 590 export HOME
 591
 592 if test -z "$TEST_NO_CREATE_REPO"
 593 then
 594         test_create_repo "$test"
 595 else
 596         mkdir -p "$test"
 597 fi
 598 # Use -P to resolve symlinks in our working directory so that the cwd
 599 # in subprocesses like git equals our $PWD (for pathname comparisons).
 600 cd -P "$test" || exit 1
 601
 602 this_test=${0##*/}
 603 this_test=${this_test%%-*}
 604 for skp in $GIT_SKIP_TESTS
 605 do
 606         case "$this_test" in
 607         $skp)
 608                 say_color skip >&3 "skipping test $this_test altogether"
 609                 skip_all="skip all tests in $this_test"
 610                 test_done
 611         esac
 612 done
 613
 614 # Provide an implementation of the 'yes' utility
 615 yes () {
 616         if test $# = 0
 617         then
 618                 y=y
 619         else
 620                 y="$*"
 621         fi
 622
 623         while echo "$y"
 624         do
 625                 :
 626         done
 627 }
 628
 629 # Fix some commands on Windows
 630 case $(uname -s) in
 631 *MINGW*)
 632         # Windows has its own (incompatible) sort and find
 633         sort () {
 634                 /usr/bin/sort "$@"
 635         }
 636         find () {
 637                 /usr/bin/find "$@"
 638         }
 639         sum () {
 640                 md5sum "$@"
 641         }
 642         # git sees Windows-style pwd
 643         pwd () {
 644                 builtin pwd -W
 645         }
 646         # no POSIX permissions
 647         # backslashes in pathspec are converted to '/'
 648         # exec does not inherit the PID
 649         test_set_prereq MINGW
 650         test_set_prereq SED_STRIPS_CR
 651         ;;
 652 *CYGWIN*)
 653         test_set_prereq POSIXPERM
 654         test_set_prereq EXECKEEPSPID
 655         test_set_prereq NOT_MINGW
 656         test_set_prereq SED_STRIPS_CR
 657         ;;
 658 *)
 659         test_set_prereq POSIXPERM
 660         test_set_prereq BSLASHPSPEC
 661         test_set_prereq EXECKEEPSPID
 662         test_set_prereq NOT_MINGW
 663         ;;
 664 esac
 665
 666 ( COLUMNS=1 && test $COLUMNS = 1 ) && test_set_prereq COLUMNS_CAN_BE_1
 667 test -z "$NO_PERL" && test_set_prereq PERL
 668 test -z "$NO_PYTHON" && test_set_prereq PYTHON
 669 test -n "$USE_LIBPCRE" && test_set_prereq LIBPCRE
 670 test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
 671
 672 # Can we rely on git's output in the C locale?
 673 if test -n "$GETTEXT_POISON"
 674 then
 675         GIT_GETTEXT_POISON=YesPlease
 676         export GIT_GETTEXT_POISON
 677         test_set_prereq GETTEXT_POISON
 678 else
 679         test_set_prereq C_LOCALE_OUTPUT
 680 fi
 681
 682 # Use this instead of test_cmp to compare files that contain expected and
 683 # actual output from git commands that can be translated.  When running
 684 # under GETTEXT_POISON this pretends that the command produced expected
 685 # results.
 686 test_i18ncmp () {
 687         test -n "$GETTEXT_POISON" || test_cmp "$@"
 688 }
 689
 690 # Use this instead of "grep expected-string actual" to see if the
 691 # output from a git command that can be translated either contains an
 692 # expected string, or does not contain an unwanted one.  When running
 693 # under GETTEXT_POISON this pretends that the command produced expected
 694 # results.
 695 test_i18ngrep () {
 696         if test -n "$GETTEXT_POISON"
 697         then
 698             : # pretend success
 699         elif test "x!" = "x$1"
 700         then
 701                 shift
 702                 ! grep "$@"
 703         else
 704                 grep "$@"
 705         fi
 706 }
 707
 708 test_lazy_prereq SYMLINKS '
 709         # test whether the filesystem supports symbolic links
 710         ln -s x y && test -h y
 711 '
 712
 713 test_lazy_prereq CASE_INSENSITIVE_FS '
 714         echo good >CamelCase &&
 715         echo bad >camelcase &&
 716         test "$(cat CamelCase)" != good
 717 '
 718
 719 test_lazy_prereq UTF8_NFD_TO_NFC '
 720         # check whether FS converts nfd unicode to nfc
 721         auml=$(printf "\303\244")
 722         aumlcdiar=$(printf "\141\314\210")
 723         >"$auml" &&
 724         case "$(echo *)" in
 725         "$aumlcdiar")
 726                 true ;;
 727         *)
 728                 false ;;
 729         esac
 730 '
 731
 732 # When the tests are run as root, permission tests will report that
 733 # things are writable when they shouldn't be.
 734 test -w / || test_set_prereq SANITY