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