t/test-lib-functions.sh

   1 # Library of functions shared by all tests scripts, included by
   2 # test-lib.sh.
   3 #
   4 # Copyright (c) 2005 Junio C Hamano
   5 #
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see http://www.gnu.org/licenses/ .
  18
  19 # The semantics of the editor variables are that of invoking
  20 # sh -c "$EDITOR \"$@\"" files ...
  21 #
  22 # If our trash directory contains shell metacharacters, they will be
  23 # interpreted if we just set $EDITOR directly, so do a little dance with
  24 # environment variables to work around this.
  25 #
  26 # In particular, quoting isn't enough, as the path may contain the same quote
  27 # that we're using.
  28 test_set_editor () {
  29         FAKE_EDITOR="$1"
  30         export FAKE_EDITOR
  31         EDITOR='"$FAKE_EDITOR"'
  32         export EDITOR
  33 }
  34
  35 test_set_index_version () {
  36     GIT_INDEX_VERSION="$1"
  37     export GIT_INDEX_VERSION
  38 }
  39
  40 test_decode_color () {
  41         awk '
  42                 function name(n) {
  43                         if (n == 0) return "RESET";
  44                         if (n == 1) return "BOLD";
  45                         if (n == 30) return "BLACK";
  46                         if (n == 31) return "RED";
  47                         if (n == 32) return "GREEN";
  48                         if (n == 33) return "YELLOW";
  49                         if (n == 34) return "BLUE";
  50                         if (n == 35) return "MAGENTA";
  51                         if (n == 36) return "CYAN";
  52                         if (n == 37) return "WHITE";
  53                         if (n == 40) return "BLACK";
  54                         if (n == 41) return "BRED";
  55                         if (n == 42) return "BGREEN";
  56                         if (n == 43) return "BYELLOW";
  57                         if (n == 44) return "BBLUE";
  58                         if (n == 45) return "BMAGENTA";
  59                         if (n == 46) return "BCYAN";
  60                         if (n == 47) return "BWHITE";
  61                 }
  62                 {
  63                         while (match($0, /\033\[[0-9;]*m/) != 0) {
  64                                 printf "%s<", substr($0, 1, RSTART-1);
  65                                 codes = substr($0, RSTART+2, RLENGTH-3);
  66                                 if (length(codes) == 0)
  67                                         printf "%s", name(0)
  68                                 else {
  69                                         n = split(codes, ary, ";");
  70                                         sep = "";
  71                                         for (i = 1; i <= n; i++) {
  72                                                 printf "%s%s", sep, name(ary[i]);
  73                                                 sep = ";"
  74                                         }
  75                                 }
  76                                 printf ">";
  77                                 $0 = substr($0, RSTART + RLENGTH, length($0) - RSTART - RLENGTH + 1);
  78                         }
  79                         print
  80                 }
  81         '
  82 }
  83
  84 lf_to_nul () {
  85         perl -pe 'y/\012/\000/'
  86 }
  87
  88 nul_to_q () {
  89         perl -pe 'y/\000/Q/'
  90 }
  91
  92 q_to_nul () {
  93         perl -pe 'y/Q/\000/'
  94 }
  95
  96 q_to_cr () {
  97         tr Q '\015'
  98 }
  99
 100 q_to_tab () {
 101         tr Q '\011'
 102 }
 103
 104 qz_to_tab_space () {
 105         tr QZ '\011\040'
 106 }
 107
 108 append_cr () {
 109         sed -e 's/$/Q/' | tr Q '\015'
 110 }
 111
 112 remove_cr () {
 113         tr '\015' Q | sed -e 's/Q$//'
 114 }
 115
 116 # In some bourne shell implementations, the "unset" builtin returns
 117 # nonzero status when a variable to be unset was not set in the first
 118 # place.
 119 #
 120 # Use sane_unset when that should not be considered an error.
 121
 122 sane_unset () {
 123         unset "$@"
 124         return 0
 125 }
 126
 127 test_tick () {
 128         if test -z "${test_tick+set}"
 129         then
 130                 test_tick=1112911993
 131         else
 132                 test_tick=$(($test_tick + 60))
 133         fi
 134         GIT_COMMITTER_DATE="$test_tick -0700"
 135         GIT_AUTHOR_DATE="$test_tick -0700"
 136         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 137 }
 138
 139 # Stop execution and start a shell. This is useful for debugging tests and
 140 # only makes sense together with "-v".
 141 #
 142 # Be sure to remove all invocations of this command before submitting.
 143
 144 test_pause () {
 145         if test "$verbose" = t; then
 146                 "$SHELL_PATH" <&6 >&3 2>&4
 147         else
 148                 error >&5 "test_pause requires --verbose"
 149         fi
 150 }
 151
 152 # Wrap git in gdb. Adding this to a command can make it easier to
 153 # understand what is going on in a failing test.
 154 #
 155 # Example: "debug git checkout master".
 156 debug () {
 157          GIT_TEST_GDB=1 "$@"
 158 }
 159
 160 # Call test_commit with the arguments
 161 # [-C <directory>] <message> [<file> [<contents> [<tag>]]]"
 162 #
 163 # This will commit a file with the given contents and the given commit
 164 # message, and tag the resulting commit with the given tag name.
 165 #
 166 # <file>, <contents>, and <tag> all default to <message>.
 167 #
 168 # If the first argument is "-C", the second argument is used as a path for
 169 # the git invocations.
 170
 171 test_commit () {
 172         notick= &&
 173         signoff= &&
 174         indir= &&
 175         while test $# != 0
 176         do
 177                 case "$1" in
 178                 --notick)
 179                         notick=yes
 180                         ;;
 181                 --signoff)
 182                         signoff="$1"
 183                         ;;
 184                 -C)
 185                         indir="$2"
 186                         shift
 187                         ;;
 188                 *)
 189                         break
 190                         ;;
 191                 esac
 192                 shift
 193         done &&
 194         indir=${indir:+"$indir"/} &&
 195         file=${2:-"$1.t"} &&
 196         echo "${3-$1}" > "$indir$file" &&
 197         git ${indir:+ -C "$indir"} add "$file" &&
 198         if test -z "$notick"
 199         then
 200                 test_tick
 201         fi &&
 202         git ${indir:+ -C "$indir"} commit $signoff -m "$1" &&
 203         git ${indir:+ -C "$indir"} tag "${4:-$1}"
 204 }
 205
 206 # Call test_merge with the arguments "<message> <commit>", where <commit>
 207 # can be a tag pointing to the commit-to-merge.
 208
 209 test_merge () {
 210         test_tick &&
 211         git merge -m "$1" "$2" &&
 212         git tag "$1"
 213 }
 214
 215 # This function helps systems where core.filemode=false is set.
 216 # Use it instead of plain 'chmod +x' to set or unset the executable bit
 217 # of a file in the working directory and add it to the index.
 218
 219 test_chmod () {
 220         chmod "$@" &&
 221         git update-index --add "--chmod=$@"
 222 }
 223
 224 # Unset a configuration variable, but don't fail if it doesn't exist.
 225 test_unconfig () {
 226         config_dir=
 227         if test "$1" = -C
 228         then
 229                 shift
 230                 config_dir=$1
 231                 shift
 232         fi
 233         git ${config_dir:+-C "$config_dir"} config --unset-all "$@"
 234         config_status=$?
 235         case "$config_status" in
 236         5) # ok, nothing to unset
 237                 config_status=0
 238                 ;;
 239         esac
 240         return $config_status
 241 }
 242
 243 # Set git config, automatically unsetting it after the test is over.
 244 test_config () {
 245         config_dir=
 246         if test "$1" = -C
 247         then
 248                 shift
 249                 config_dir=$1
 250                 shift
 251         fi
 252         test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" &&
 253         git ${config_dir:+-C "$config_dir"} config "$@"
 254 }
 255
 256 test_config_global () {
 257         test_when_finished "test_unconfig --global '$1'" &&
 258         git config --global "$@"
 259 }
 260
 261 write_script () {
 262         {
 263                 echo "#!${2-"$SHELL_PATH"}" &&
 264                 cat
 265         } >"$1" &&
 266         chmod +x "$1"
 267 }
 268
 269 # Use test_set_prereq to tell that a particular prerequisite is available.
 270 # The prerequisite can later be checked for in two ways:
 271 #
 272 # - Explicitly using test_have_prereq.
 273 #
 274 # - Implicitly by specifying the prerequisite tag in the calls to
 275 #   test_expect_{success,failure,code}.
 276 #
 277 # The single parameter is the prerequisite tag (a simple word, in all
 278 # capital letters by convention).
 279
 280 test_set_prereq () {
 281         satisfied_prereq="$satisfied_prereq$1 "
 282 }
 283 satisfied_prereq=" "
 284 lazily_testable_prereq= lazily_tested_prereq=
 285
 286 # Usage: test_lazy_prereq PREREQ 'script'
 287 test_lazy_prereq () {
 288         lazily_testable_prereq="$lazily_testable_prereq$1 "
 289         eval test_prereq_lazily_$1=\$2
 290 }
 291
 292 test_run_lazy_prereq_ () {
 293         script='
 294 mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" &&
 295 (
 296         cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"'
 297 )'
 298         say >&3 "checking prerequisite: $1"
 299         say >&3 "$script"
 300         test_eval_ "$script"
 301         eval_ret=$?
 302         rm -rf "$TRASH_DIRECTORY/prereq-test-dir"
 303         if test "$eval_ret" = 0; then
 304                 say >&3 "prerequisite $1 ok"
 305         else
 306                 say >&3 "prerequisite $1 not satisfied"
 307         fi
 308         return $eval_ret
 309 }
 310
 311 test_have_prereq () {
 312         # prerequisites can be concatenated with ','
 313         save_IFS=$IFS
 314         IFS=,
 315         set -- $*
 316         IFS=$save_IFS
 317
 318         total_prereq=0
 319         ok_prereq=0
 320         missing_prereq=
 321
 322         for prerequisite
 323         do
 324                 case "$prerequisite" in
 325                 !*)
 326                         negative_prereq=t
 327                         prerequisite=${prerequisite#!}
 328                         ;;
 329                 *)
 330                         negative_prereq=
 331                 esac
 332
 333                 case " $lazily_tested_prereq " in
 334                 *" $prerequisite "*)
 335                         ;;
 336                 *)
 337                         case " $lazily_testable_prereq " in
 338                         *" $prerequisite "*)
 339                                 eval "script=\$test_prereq_lazily_$prerequisite" &&
 340                                 if test_run_lazy_prereq_ "$prerequisite" "$script"
 341                                 then
 342                                         test_set_prereq $prerequisite
 343                                 fi
 344                                 lazily_tested_prereq="$lazily_tested_prereq$prerequisite "
 345                         esac
 346                         ;;
 347                 esac
 348
 349                 total_prereq=$(($total_prereq + 1))
 350                 case "$satisfied_prereq" in
 351                 *" $prerequisite "*)
 352                         satisfied_this_prereq=t
 353                         ;;
 354                 *)
 355                         satisfied_this_prereq=
 356                 esac
 357
 358                 case "$satisfied_this_prereq,$negative_prereq" in
 359                 t,|,t)
 360                         ok_prereq=$(($ok_prereq + 1))
 361                         ;;
 362                 *)
 363                         # Keep a list of missing prerequisites; restore
 364                         # the negative marker if necessary.
 365                         prerequisite=${negative_prereq:+!}$prerequisite
 366                         if test -z "$missing_prereq"
 367                         then
 368                                 missing_prereq=$prerequisite
 369                         else
 370                                 missing_prereq="$prerequisite,$missing_prereq"
 371                         fi
 372                 esac
 373         done
 374
 375         test $total_prereq = $ok_prereq
 376 }
 377
 378 test_declared_prereq () {
 379         case ",$test_prereq," in
 380         *,$1,*)
 381                 return 0
 382                 ;;
 383         esac
 384         return 1
 385 }
 386
 387 test_verify_prereq () {
 388         test -z "$test_prereq" ||
 389         expr >/dev/null "$test_prereq" : '[A-Z0-9_,!]*$' ||
 390         error "bug in the test script: '$test_prereq' does not look like a prereq"
 391 }
 392
 393 test_expect_failure () {
 394         test_start_
 395         test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 396         test "$#" = 2 ||
 397         error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
 398         test_verify_prereq
 399         export test_prereq
 400         if ! test_skip "$@"
 401         then
 402                 say >&3 "checking known breakage: $2"
 403                 if test_run_ "$2" expecting_failure
 404                 then
 405                         test_known_broken_ok_ "$1"
 406                 else
 407                         test_known_broken_failure_ "$1"
 408                 fi
 409         fi
 410         test_finish_
 411 }
 412
 413 test_expect_success () {
 414         test_start_
 415         test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 416         test "$#" = 2 ||
 417         error "bug in the test script: not 2 or 3 parameters to test-expect-success"
 418         test_verify_prereq
 419         export test_prereq
 420         if ! test_skip "$@"
 421         then
 422                 say >&3 "expecting success: $2"
 423                 if test_run_ "$2"
 424                 then
 425                         test_ok_ "$1"
 426                 else
 427                         test_failure_ "$@"
 428                 fi
 429         fi
 430         test_finish_
 431 }
 432
 433 # test_external runs external test scripts that provide continuous
 434 # test output about their progress, and succeeds/fails on
 435 # zero/non-zero exit code.  It outputs the test output on stdout even
 436 # in non-verbose mode, and announces the external script with "# run
 437 # <n>: ..." before running it.  When providing relative paths, keep in
 438 # mind that all scripts run in "trash directory".
 439 # Usage: test_external description command arguments...
 440 # Example: test_external 'Perl API' perl ../path/to/test.pl
 441 test_external () {
 442         test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq=
 443         test "$#" = 3 ||
 444         error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
 445         descr="$1"
 446         shift
 447         test_verify_prereq
 448         export test_prereq
 449         if ! test_skip "$descr" "$@"
 450         then
 451                 # Announce the script to reduce confusion about the
 452                 # test output that follows.
 453                 say_color "" "# run $test_count: $descr ($*)"
 454                 # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
 455                 # to be able to use them in script
 456                 export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
 457                 # Run command; redirect its stderr to &4 as in
 458                 # test_run_, but keep its stdout on our stdout even in
 459                 # non-verbose mode.
 460                 "$@" 2>&4
 461                 if test "$?" = 0
 462                 then
 463                         if test $test_external_has_tap -eq 0; then
 464                                 test_ok_ "$descr"
 465                         else
 466                                 say_color "" "# test_external test $descr was ok"
 467                                 test_success=$(($test_success + 1))
 468                         fi
 469                 else
 470                         if test $test_external_has_tap -eq 0; then
 471                                 test_failure_ "$descr" "$@"
 472                         else
 473                                 say_color error "# test_external test $descr failed: $@"
 474                                 test_failure=$(($test_failure + 1))
 475                         fi
 476                 fi
 477         fi
 478 }
 479
 480 # Like test_external, but in addition tests that the command generated
 481 # no output on stderr.
 482 test_external_without_stderr () {
 483         # The temporary file has no (and must have no) security
 484         # implications.
 485         tmp=${TMPDIR:-/tmp}
 486         stderr="$tmp/git-external-stderr.$$.tmp"
 487         test_external "$@" 4> "$stderr"
 488         test -f "$stderr" || error "Internal error: $stderr disappeared."
 489         descr="no stderr: $1"
 490         shift
 491         say >&3 "# expecting no stderr from previous command"
 492         if test ! -s "$stderr"
 493         then
 494                 rm "$stderr"
 495
 496                 if test $test_external_has_tap -eq 0; then
 497                         test_ok_ "$descr"
 498                 else
 499                         say_color "" "# test_external_without_stderr test $descr was ok"
 500                         test_success=$(($test_success + 1))
 501                 fi
 502         else
 503                 if test "$verbose" = t
 504                 then
 505                         output=$(echo; echo "# Stderr is:"; cat "$stderr")
 506                 else
 507                         output=
 508                 fi
 509                 # rm first in case test_failure exits.
 510                 rm "$stderr"
 511                 if test $test_external_has_tap -eq 0; then
 512                         test_failure_ "$descr" "$@" "$output"
 513                 else
 514                         say_color error "# test_external_without_stderr test $descr failed: $@: $output"
 515                         test_failure=$(($test_failure + 1))
 516                 fi
 517         fi
 518 }
 519
 520 # debugging-friendly alternatives to "test [-f|-d|-e]"
 521 # The commands test the existence or non-existence of $1. $2 can be
 522 # given to provide a more precise diagnosis.
 523 test_path_is_file () {
 524         if ! test -f "$1"
 525         then
 526                 echo "File $1 doesn't exist. $2"
 527                 false
 528         fi
 529 }
 530
 531 test_path_is_dir () {
 532         if ! test -d "$1"
 533         then
 534                 echo "Directory $1 doesn't exist. $2"
 535                 false
 536         fi
 537 }
 538
 539 # Check if the directory exists and is empty as expected, barf otherwise.
 540 test_dir_is_empty () {
 541         test_path_is_dir "$1" &&
 542         if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
 543         then
 544                 echo "Directory '$1' is not empty, it contains:"
 545                 ls -la "$1"
 546                 return 1
 547         fi
 548 }
 549
 550 test_path_is_missing () {
 551         if test -e "$1"
 552         then
 553                 echo "Path exists:"
 554                 ls -ld "$1"
 555                 if test $# -ge 1
 556                 then
 557                         echo "$*"
 558                 fi
 559                 false
 560         fi
 561 }
 562
 563 # test_line_count checks that a file has the number of lines it
 564 # ought to. For example:
 565 #
 566 #       test_expect_success 'produce exactly one line of output' '
 567 #               do something >output &&
 568 #               test_line_count = 1 output
 569 #       '
 570 #
 571 # is like "test $(wc -l <output) = 1" except that it passes the
 572 # output through when the number of lines is wrong.
 573
 574 test_line_count () {
 575         if test $# != 3
 576         then
 577                 error "bug in the test script: not 3 parameters to test_line_count"
 578         elif ! test $(wc -l <"$3") "$1" "$2"
 579         then
 580                 echo "test_line_count: line count for $3 !$1 $2"
 581                 cat "$3"
 582                 return 1
 583         fi
 584 }
 585
 586 # Returns success if a comma separated string of keywords ($1) contains a
 587 # given keyword ($2).
 588 # Examples:
 589 # `list_contains "foo,bar" bar` returns 0
 590 # `list_contains "foo" bar` returns 1
 591
 592 list_contains () {
 593         case ",$1," in
 594         *,$2,*)
 595                 return 0
 596                 ;;
 597         esac
 598         return 1
 599 }
 600
 601 # This is not among top-level (test_expect_success | test_expect_failure)
 602 # but is a prefix that can be used in the test script, like:
 603 #
 604 #       test_expect_success 'complain and die' '
 605 #           do something &&
 606 #           do something else &&
 607 #           test_must_fail git checkout ../outerspace
 608 #       '
 609 #
 610 # Writing this as "! git checkout ../outerspace" is wrong, because
 611 # the failure could be due to a segv.  We want a controlled failure.
 612
 613 test_must_fail () {
 614         case "$1" in
 615         ok=*)
 616                 _test_ok=${1#ok=}
 617                 shift
 618                 ;;
 619         *)
 620                 _test_ok=
 621                 ;;
 622         esac
 623         "$@"
 624         exit_code=$?
 625         if test $exit_code -eq 0 && ! list_contains "$_test_ok" success
 626         then
 627                 echo >&2 "test_must_fail: command succeeded: $*"
 628                 return 1
 629         elif test_match_signal 13 $exit_code && list_contains "$_test_ok" sigpipe
 630         then
 631                 return 0
 632         elif test $exit_code -gt 129 && test $exit_code -le 192
 633         then
 634                 echo >&2 "test_must_fail: died by signal $(($exit_code - 128)): $*"
 635                 return 1
 636         elif test $exit_code -eq 127
 637         then
 638                 echo >&2 "test_must_fail: command not found: $*"
 639                 return 1
 640         elif test $exit_code -eq 126
 641         then
 642                 echo >&2 "test_must_fail: valgrind error: $*"
 643                 return 1
 644         fi
 645         return 0
 646 }
 647
 648 # Similar to test_must_fail, but tolerates success, too.  This is
 649 # meant to be used in contexts like:
 650 #
 651 #       test_expect_success 'some command works without configuration' '
 652 #               test_might_fail git config --unset all.configuration &&
 653 #               do something
 654 #       '
 655 #
 656 # Writing "git config --unset all.configuration || :" would be wrong,
 657 # because we want to notice if it fails due to segv.
 658
 659 test_might_fail () {
 660         test_must_fail ok=success "$@"
 661 }
 662
 663 # Similar to test_must_fail and test_might_fail, but check that a
 664 # given command exited with a given exit code. Meant to be used as:
 665 #
 666 #       test_expect_success 'Merge with d/f conflicts' '
 667 #               test_expect_code 1 git merge "merge msg" B master
 668 #       '
 669
 670 test_expect_code () {
 671         want_code=$1
 672         shift
 673         "$@"
 674         exit_code=$?
 675         if test $exit_code = $want_code
 676         then
 677                 return 0
 678         fi
 679
 680         echo >&2 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
 681         return 1
 682 }
 683
 684 # test_cmp is a helper function to compare actual and expected output.
 685 # You can use it like:
 686 #
 687 #       test_expect_success 'foo works' '
 688 #               echo expected >expected &&
 689 #               foo >actual &&
 690 #               test_cmp expected actual
 691 #       '
 692 #
 693 # This could be written as either "cmp" or "diff -u", but:
 694 # - cmp's output is not nearly as easy to read as diff -u
 695 # - not all diff versions understand "-u"
 696
 697 test_cmp() {
 698         $GIT_TEST_CMP "$@"
 699 }
 700
 701 # test_cmp_bin - helper to compare binary files
 702
 703 test_cmp_bin() {
 704         cmp "$@"
 705 }
 706
 707 # Call any command "$@" but be more verbose about its
 708 # failure. This is handy for commands like "test" which do
 709 # not output anything when they fail.
 710 verbose () {
 711         "$@" && return 0
 712         echo >&2 "command failed: $(git rev-parse --sq-quote "$@")"
 713         return 1
 714 }
 715
 716 # Check if the file expected to be empty is indeed empty, and barfs
 717 # otherwise.
 718
 719 test_must_be_empty () {
 720         if test -s "$1"
 721         then
 722                 echo "'$1' is not empty, it contains:"
 723                 cat "$1"
 724                 return 1
 725         fi
 726 }
 727
 728 # Tests that its two parameters refer to the same revision
 729 test_cmp_rev () {
 730         git rev-parse --verify "$1" >expect.rev &&
 731         git rev-parse --verify "$2" >actual.rev &&
 732         test_cmp expect.rev actual.rev
 733 }
 734
 735 # Print a sequence of integers in increasing order, either with
 736 # two arguments (start and end):
 737 #
 738 #     test_seq 1 5 -- outputs 1 2 3 4 5 one line at a time
 739 #
 740 # or with one argument (end), in which case it starts counting
 741 # from 1.
 742
 743 test_seq () {
 744         case $# in
 745         1)      set 1 "$@" ;;
 746         2)      ;;
 747         *)      error "bug in the test script: not 1 or 2 parameters to test_seq" ;;
 748         esac
 749         test_seq_counter__=$1
 750         while test "$test_seq_counter__" -le "$2"
 751         do
 752                 echo "$test_seq_counter__"
 753                 test_seq_counter__=$(( $test_seq_counter__ + 1 ))
 754         done
 755 }
 756
 757 # This function can be used to schedule some commands to be run
 758 # unconditionally at the end of the test to restore sanity:
 759 #
 760 #       test_expect_success 'test core.capslock' '
 761 #               git config core.capslock true &&
 762 #               test_when_finished "git config --unset core.capslock" &&
 763 #               hello world
 764 #       '
 765 #
 766 # That would be roughly equivalent to
 767 #
 768 #       test_expect_success 'test core.capslock' '
 769 #               git config core.capslock true &&
 770 #               hello world
 771 #               git config --unset core.capslock
 772 #       '
 773 #
 774 # except that the greeting and config --unset must both succeed for
 775 # the test to pass.
 776 #
 777 # Note that under --immediate mode, no clean-up is done to help diagnose
 778 # what went wrong.
 779
 780 test_when_finished () {
 781         # We cannot detect when we are in a subshell in general, but by
 782         # doing so on Bash is better than nothing (the test will
 783         # silently pass on other shells).
 784         test "${BASH_SUBSHELL-0}" = 0 ||
 785         error "bug in test script: test_when_finished does nothing in a subshell"
 786         test_cleanup="{ $*
 787                 } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 788 }
 789
 790 # Most tests can use the created repository, but some may need to create more.
 791 # Usage: test_create_repo <directory>
 792 test_create_repo () {
 793         test "$#" = 1 ||
 794         error "bug in the test script: not 1 parameter to test-create-repo"
 795         repo="$1"
 796         mkdir -p "$repo"
 797         (
 798                 cd "$repo" || error "Cannot setup test environment"
 799                 "$GIT_EXEC_PATH/git-init" "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
 800                 error "cannot run git init -- have you built things yet?"
 801                 mv .git/hooks .git/hooks-disabled
 802         ) || exit
 803 }
 804
 805 # This function helps on symlink challenged file systems when it is not
 806 # important that the file system entry is a symbolic link.
 807 # Use test_ln_s_add instead of "ln -s x y && git add y" to add a
 808 # symbolic link entry y to the index.
 809
 810 test_ln_s_add () {
 811         if test_have_prereq SYMLINKS
 812         then
 813                 ln -s "$1" "$2" &&
 814                 git update-index --add "$2"
 815         else
 816                 printf '%s' "$1" >"$2" &&
 817                 ln_s_obj=$(git hash-object -w "$2") &&
 818                 git update-index --add --cacheinfo 120000 $ln_s_obj "$2" &&
 819                 # pick up stat info from the file
 820                 git update-index "$2"
 821         fi
 822 }
 823
 824 # This function writes out its parameters, one per line
 825 test_write_lines () {
 826         printf "%s\n" "$@"
 827 }
 828
 829 perl () {
 830         command "$PERL_PATH" "$@"
 831 }
 832
 833 # Is the value one of the various ways to spell a boolean true/false?
 834 test_normalize_bool () {
 835         git -c magic.variable="$1" config --bool magic.variable 2>/dev/null
 836 }
 837
 838 # Given a variable $1, normalize the value of it to one of "true",
 839 # "false", or "auto" and store the result to it.
 840 #
 841 #     test_tristate GIT_TEST_HTTPD
 842 #
 843 # A variable set to an empty string is set to 'false'.
 844 # A variable set to 'false' or 'auto' keeps its value.
 845 # Anything else is set to 'true'.
 846 # An unset variable defaults to 'auto'.
 847 #
 848 # The last rule is to allow people to set the variable to an empty
 849 # string and export it to decline testing the particular feature
 850 # for versions both before and after this change.  We used to treat
 851 # both unset and empty variable as a signal for "do not test" and
 852 # took any non-empty string as "please test".
 853
 854 test_tristate () {
 855         if eval "test x\"\${$1+isset}\" = xisset"
 856         then
 857                 # explicitly set
 858                 eval "
 859                         case \"\$$1\" in
 860                         '')     $1=false ;;
 861                         auto)   ;;
 862                         *)      $1=\$(test_normalize_bool \$$1 || echo true) ;;
 863                         esac
 864                 "
 865         else
 866                 eval "$1=auto"
 867         fi
 868 }
 869
 870 # Exit the test suite, either by skipping all remaining tests or by
 871 # exiting with an error. If "$1" is "auto", we then we assume we were
 872 # opportunistically trying to set up some tests and we skip. If it is
 873 # "true", then we report a failure.
 874 #
 875 # The error/skip message should be given by $2.
 876 #
 877 test_skip_or_die () {
 878         case "$1" in
 879         auto)
 880                 skip_all=$2
 881                 test_done
 882                 ;;
 883         true)
 884                 error "$2"
 885                 ;;
 886         *)
 887                 error "BUG: test tristate is '$1' (real error: $2)"
 888         esac
 889 }
 890
 891 # The following mingw_* functions obey POSIX shell syntax, but are actually
 892 # bash scripts, and are meant to be used only with bash on Windows.
 893
 894 # A test_cmp function that treats LF and CRLF equal and avoids to fork
 895 # diff when possible.
 896 mingw_test_cmp () {
 897         # Read text into shell variables and compare them. If the results
 898         # are different, use regular diff to report the difference.
 899         local test_cmp_a= test_cmp_b=
 900
 901         # When text came from stdin (one argument is '-') we must feed it
 902         # to diff.
 903         local stdin_for_diff=
 904
 905         # Since it is difficult to detect the difference between an
 906         # empty input file and a failure to read the files, we go straight
 907         # to diff if one of the inputs is empty.
 908         if test -s "$1" && test -s "$2"
 909         then
 910                 # regular case: both files non-empty
 911                 mingw_read_file_strip_cr_ test_cmp_a <"$1"
 912                 mingw_read_file_strip_cr_ test_cmp_b <"$2"
 913         elif test -s "$1" && test "$2" = -
 914         then
 915                 # read 2nd file from stdin
 916                 mingw_read_file_strip_cr_ test_cmp_a <"$1"
 917                 mingw_read_file_strip_cr_ test_cmp_b
 918                 stdin_for_diff='<<<"$test_cmp_b"'
 919         elif test "$1" = - && test -s "$2"
 920         then
 921                 # read 1st file from stdin
 922                 mingw_read_file_strip_cr_ test_cmp_a
 923                 mingw_read_file_strip_cr_ test_cmp_b <"$2"
 924                 stdin_for_diff='<<<"$test_cmp_a"'
 925         fi
 926         test -n "$test_cmp_a" &&
 927         test -n "$test_cmp_b" &&
 928         test "$test_cmp_a" = "$test_cmp_b" ||
 929         eval "diff -u \"\$@\" $stdin_for_diff"
 930 }
 931
 932 # $1 is the name of the shell variable to fill in
 933 mingw_read_file_strip_cr_ () {
 934         # Read line-wise using LF as the line separator
 935         # and use IFS to strip CR.
 936         local line
 937         while :
 938         do
 939                 if IFS=$'\r' read -r -d $'\n' line
 940                 then
 941                         # good
 942                         line=$line$'\n'
 943                 else
 944                         # we get here at EOF, but also if the last line
 945                         # was not terminated by LF; in the latter case,
 946                         # some text was read
 947                         if test -z "$line"
 948                         then
 949                                 # EOF, really
 950                                 break
 951                         fi
 952                 fi
 953                 eval "$1=\$$1\$line"
 954         done
 955 }
 956
 957 # Like "env FOO=BAR some-program", but run inside a subshell, which means
 958 # it also works for shell functions (though those functions cannot impact
 959 # the environment outside of the test_env invocation).
 960 test_env () {
 961         (
 962                 while test $# -gt 0
 963                 do
 964                         case "$1" in
 965                         *=*)
 966                                 eval "${1%%=*}=\${1#*=}"
 967                                 eval "export ${1%%=*}"
 968                                 shift
 969                                 ;;
 970                         *)
 971                                 "$@"
 972                                 exit
 973                                 ;;
 974                         esac
 975                 done
 976         )
 977 }
 978
 979 # Returns true if the numeric exit code in "$2" represents the expected signal
 980 # in "$1". Signals should be given numerically.
 981 test_match_signal () {
 982         if test "$2" = "$((128 + $1))"
 983         then
 984                 # POSIX
 985                 return 0
 986         elif test "$2" = "$((256 + $1))"
 987         then
 988                 # ksh
 989                 return 0
 990         fi
 991         return 1
 992 }
 993
 994 # Read up to "$1" bytes (or to EOF) from stdin and write them to stdout.
 995 test_copy_bytes () {
 996         perl -e '
 997                 my $len = $ARGV[1];
 998                 while ($len > 0) {
 999                         my $s;
1000                         my $nread = sysread(STDIN, $s, $len);
1001                         die "cannot read: $!" unless defined($nread);
1002                         print $s;
1003                         $len -= $nread;
1004                 }
1005         ' - "$1"
1006 }
1007
1008 # run "$@" inside a non-git directory
1009 nongit () {
1010         test -d non-repo ||
1011         mkdir non-repo ||
1012         return 1
1013
1014         (
1015                 GIT_CEILING_DIRECTORIES=$(pwd) &&
1016                 export GIT_CEILING_DIRECTORIES &&
1017                 cd non-repo &&
1018                 "$@"
1019         )
1020 }