Andrew's git / gitweb.git / t/test-lib-functions.sh
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t / test-lib-functions.shon commit Documentation/git-bisect.txt: git bisect term → git bisect terms (bbd374d)
   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.
  28test_set_editor () {
  29        FAKE_EDITOR="$1"
  30        export FAKE_EDITOR
  31        EDITOR='"$FAKE_EDITOR"'
  32        export EDITOR
  33}
  34
  35test_set_index_version () {
  36    GIT_INDEX_VERSION="$1"
  37    export GIT_INDEX_VERSION
  38}
  39
  40test_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($0) - RSTART - RLENGTH + 1);
  78                        }
  79                        print
  80                }
  81        '
  82}
  83
  84nul_to_q () {
  85        perl -pe 'y/\000/Q/'
  86}
  87
  88q_to_nul () {
  89        perl -pe 'y/Q/\000/'
  90}
  91
  92q_to_cr () {
  93        tr Q '\015'
  94}
  95
  96q_to_tab () {
  97        tr Q '\011'
  98}
  99
 100qz_to_tab_space () {
 101        tr QZ '\011\040'
 102}
 103
 104append_cr () {
 105        sed -e 's/$/Q/' | tr Q '\015'
 106}
 107
 108remove_cr () {
 109        tr '\015' Q | sed -e 's/Q$//'
 110}
 111
 112# In some bourne shell implementations, the "unset" builtin returns
 113# nonzero status when a variable to be unset was not set in the first
 114# place.
 115#
 116# Use sane_unset when that should not be considered an error.
 117
 118sane_unset () {
 119        unset "$@"
 120        return 0
 121}
 122
 123test_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="$test_tick -0700"
 132        export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 133}
 134
 135# Stop execution and start a shell. This is useful for debugging tests and
 136# only makes sense together with "-v".
 137#
 138# Be sure to remove all invocations of this command before submitting.
 139
 140test_pause () {
 141        if test "$verbose" = t; then
 142                "$SHELL_PATH" <&6 >&3 2>&4
 143        else
 144                error >&5 "test_pause requires --verbose"
 145        fi
 146}
 147
 148# Call test_commit with the arguments "<message> [<file> [<contents> [<tag>]]]"
 149#
 150# This will commit a file with the given contents and the given commit
 151# message, and tag the resulting commit with the given tag name.
 152#
 153# <file>, <contents>, and <tag> all default to <message>.
 154
 155test_commit () {
 156        notick= &&
 157        signoff= &&
 158        while test $# != 0
 159        do
 160                case "$1" in
 161                --notick)
 162                        notick=yes
 163                        ;;
 164                --signoff)
 165                        signoff="$1"
 166                        ;;
 167                *)
 168                        break
 169                        ;;
 170                esac
 171                shift
 172        done &&
 173        file=${2:-"$1.t"} &&
 174        echo "${3-$1}" > "$file" &&
 175        git add "$file" &&
 176        if test -z "$notick"
 177        then
 178                test_tick
 179        fi &&
 180        git commit $signoff -m "$1" &&
 181        git tag "${4:-$1}"
 182}
 183
 184# Call test_merge with the arguments "<message> <commit>", where <commit>
 185# can be a tag pointing to the commit-to-merge.
 186
 187test_merge () {
 188        test_tick &&
 189        git merge -m "$1" "$2" &&
 190        git tag "$1"
 191}
 192
 193# This function helps systems where core.filemode=false is set.
 194# Use it instead of plain 'chmod +x' to set or unset the executable bit
 195# of a file in the working directory and add it to the index.
 196
 197test_chmod () {
 198        chmod "$@" &&
 199        git update-index --add "--chmod=$@"
 200}
 201
 202# Unset a configuration variable, but don't fail if it doesn't exist.
 203test_unconfig () {
 204        git config --unset-all "$@"
 205        config_status=$?
 206        case "$config_status" in
 207        5) # ok, nothing to unset
 208                config_status=0
 209                ;;
 210        esac
 211        return $config_status
 212}
 213
 214# Set git config, automatically unsetting it after the test is over.
 215test_config () {
 216        test_when_finished "test_unconfig '$1'" &&
 217        git config "$@"
 218}
 219
 220test_config_global () {
 221        test_when_finished "test_unconfig --global '$1'" &&
 222        git config --global "$@"
 223}
 224
 225write_script () {
 226        {
 227                echo "#!${2-"$SHELL_PATH"}" &&
 228                cat
 229        } >"$1" &&
 230        chmod +x "$1"
 231}
 232
 233# Use test_set_prereq to tell that a particular prerequisite is available.
 234# The prerequisite can later be checked for in two ways:
 235#
 236# - Explicitly using test_have_prereq.
 237#
 238# - Implicitly by specifying the prerequisite tag in the calls to
 239#   test_expect_{success,failure,code}.
 240#
 241# The single parameter is the prerequisite tag (a simple word, in all
 242# capital letters by convention).
 243
 244test_set_prereq () {
 245        satisfied_prereq="$satisfied_prereq$1 "
 246}
 247satisfied_prereq=" "
 248lazily_testable_prereq= lazily_tested_prereq=
 249
 250# Usage: test_lazy_prereq PREREQ 'script'
 251test_lazy_prereq () {
 252        lazily_testable_prereq="$lazily_testable_prereq$1 "
 253        eval test_prereq_lazily_$1=\$2
 254}
 255
 256test_run_lazy_prereq_ () {
 257        script='
 258mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" &&
 259(
 260        cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"'
 261)'
 262        say >&3 "checking prerequisite: $1"
 263        say >&3 "$script"
 264        test_eval_ "$script"
 265        eval_ret=$?
 266        rm -rf "$TRASH_DIRECTORY/prereq-test-dir"
 267        if test "$eval_ret" = 0; then
 268                say >&3 "prerequisite $1 ok"
 269        else
 270                say >&3 "prerequisite $1 not satisfied"
 271        fi
 272        return $eval_ret
 273}
 274
 275test_have_prereq () {
 276        # prerequisites can be concatenated with ','
 277        save_IFS=$IFS
 278        IFS=,
 279        set -- $*
 280        IFS=$save_IFS
 281
 282        total_prereq=0
 283        ok_prereq=0
 284        missing_prereq=
 285
 286        for prerequisite
 287        do
 288                case "$prerequisite" in
 289                !*)
 290                        negative_prereq=t
 291                        prerequisite=${prerequisite#!}
 292                        ;;
 293                *)
 294                        negative_prereq=
 295                esac
 296
 297                case " $lazily_tested_prereq " in
 298                *" $prerequisite "*)
 299                        ;;
 300                *)
 301                        case " $lazily_testable_prereq " in
 302                        *" $prerequisite "*)
 303                                eval "script=\$test_prereq_lazily_$prerequisite" &&
 304                                if test_run_lazy_prereq_ "$prerequisite" "$script"
 305                                then
 306                                        test_set_prereq $prerequisite
 307                                fi
 308                                lazily_tested_prereq="$lazily_tested_prereq$prerequisite "
 309                        esac
 310                        ;;
 311                esac
 312
 313                total_prereq=$(($total_prereq + 1))
 314                case "$satisfied_prereq" in
 315                *" $prerequisite "*)
 316                        satisfied_this_prereq=t
 317                        ;;
 318                *)
 319                        satisfied_this_prereq=
 320                esac
 321
 322                case "$satisfied_this_prereq,$negative_prereq" in
 323                t,|,t)
 324                        ok_prereq=$(($ok_prereq + 1))
 325                        ;;
 326                *)
 327                        # Keep a list of missing prerequisites; restore
 328                        # the negative marker if necessary.
 329                        prerequisite=${negative_prereq:+!}$prerequisite
 330                        if test -z "$missing_prereq"
 331                        then
 332                                missing_prereq=$prerequisite
 333                        else
 334                                missing_prereq="$prerequisite,$missing_prereq"
 335                        fi
 336                esac
 337        done
 338
 339        test $total_prereq = $ok_prereq
 340}
 341
 342test_declared_prereq () {
 343        case ",$test_prereq," in
 344        *,$1,*)
 345                return 0
 346                ;;
 347        esac
 348        return 1
 349}
 350
 351test_verify_prereq () {
 352        test -z "$test_prereq" ||
 353        expr >/dev/null "$test_prereq" : '[A-Z0-9_,!]*$' ||
 354        error "bug in the test script: '$test_prereq' does not look like a prereq"
 355}
 356
 357test_expect_failure () {
 358        test_start_
 359        test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 360        test "$#" = 2 ||
 361        error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
 362        test_verify_prereq
 363        export test_prereq
 364        if ! test_skip "$@"
 365        then
 366                say >&3 "checking known breakage: $2"
 367                if test_run_ "$2" expecting_failure
 368                then
 369                        test_known_broken_ok_ "$1"
 370                else
 371                        test_known_broken_failure_ "$1"
 372                fi
 373        fi
 374        test_finish_
 375}
 376
 377test_expect_success () {
 378        test_start_
 379        test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 380        test "$#" = 2 ||
 381        error "bug in the test script: not 2 or 3 parameters to test-expect-success"
 382        test_verify_prereq
 383        export test_prereq
 384        if ! test_skip "$@"
 385        then
 386                say >&3 "expecting success: $2"
 387                if test_run_ "$2"
 388                then
 389                        test_ok_ "$1"
 390                else
 391                        test_failure_ "$@"
 392                fi
 393        fi
 394        test_finish_
 395}
 396
 397# test_external runs external test scripts that provide continuous
 398# test output about their progress, and succeeds/fails on
 399# zero/non-zero exit code.  It outputs the test output on stdout even
 400# in non-verbose mode, and announces the external script with "# run
 401# <n>: ..." before running it.  When providing relative paths, keep in
 402# mind that all scripts run in "trash directory".
 403# Usage: test_external description command arguments...
 404# Example: test_external 'Perl API' perl ../path/to/test.pl
 405test_external () {
 406        test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq=
 407        test "$#" = 3 ||
 408        error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
 409        descr="$1"
 410        shift
 411        test_verify_prereq
 412        export test_prereq
 413        if ! test_skip "$descr" "$@"
 414        then
 415                # Announce the script to reduce confusion about the
 416                # test output that follows.
 417                say_color "" "# run $test_count: $descr ($*)"
 418                # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
 419                # to be able to use them in script
 420                export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
 421                # Run command; redirect its stderr to &4 as in
 422                # test_run_, but keep its stdout on our stdout even in
 423                # non-verbose mode.
 424                "$@" 2>&4
 425                if test "$?" = 0
 426                then
 427                        if test $test_external_has_tap -eq 0; then
 428                                test_ok_ "$descr"
 429                        else
 430                                say_color "" "# test_external test $descr was ok"
 431                                test_success=$(($test_success + 1))
 432                        fi
 433                else
 434                        if test $test_external_has_tap -eq 0; then
 435                                test_failure_ "$descr" "$@"
 436                        else
 437                                say_color error "# test_external test $descr failed: $@"
 438                                test_failure=$(($test_failure + 1))
 439                        fi
 440                fi
 441        fi
 442}
 443
 444# Like test_external, but in addition tests that the command generated
 445# no output on stderr.
 446test_external_without_stderr () {
 447        # The temporary file has no (and must have no) security
 448        # implications.
 449        tmp=${TMPDIR:-/tmp}
 450        stderr="$tmp/git-external-stderr.$$.tmp"
 451        test_external "$@" 4> "$stderr"
 452        test -f "$stderr" || error "Internal error: $stderr disappeared."
 453        descr="no stderr: $1"
 454        shift
 455        say >&3 "# expecting no stderr from previous command"
 456        if test ! -s "$stderr"
 457        then
 458                rm "$stderr"
 459
 460                if test $test_external_has_tap -eq 0; then
 461                        test_ok_ "$descr"
 462                else
 463                        say_color "" "# test_external_without_stderr test $descr was ok"
 464                        test_success=$(($test_success + 1))
 465                fi
 466        else
 467                if test "$verbose" = t
 468                then
 469                        output=$(echo; echo "# Stderr is:"; cat "$stderr")
 470                else
 471                        output=
 472                fi
 473                # rm first in case test_failure exits.
 474                rm "$stderr"
 475                if test $test_external_has_tap -eq 0; then
 476                        test_failure_ "$descr" "$@" "$output"
 477                else
 478                        say_color error "# test_external_without_stderr test $descr failed: $@: $output"
 479                        test_failure=$(($test_failure + 1))
 480                fi
 481        fi
 482}
 483
 484# debugging-friendly alternatives to "test [-f|-d|-e]"
 485# The commands test the existence or non-existence of $1. $2 can be
 486# given to provide a more precise diagnosis.
 487test_path_is_file () {
 488        if ! test -f "$1"
 489        then
 490                echo "File $1 doesn't exist. $2"
 491                false
 492        fi
 493}
 494
 495test_path_is_dir () {
 496        if ! test -d "$1"
 497        then
 498                echo "Directory $1 doesn't exist. $2"
 499                false
 500        fi
 501}
 502
 503# Check if the directory exists and is empty as expected, barf otherwise.
 504test_dir_is_empty () {
 505        test_path_is_dir "$1" &&
 506        if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
 507        then
 508                echo "Directory '$1' is not empty, it contains:"
 509                ls -la "$1"
 510                return 1
 511        fi
 512}
 513
 514test_path_is_missing () {
 515        if test -e "$1"
 516        then
 517                echo "Path exists:"
 518                ls -ld "$1"
 519                if test $# -ge 1
 520                then
 521                        echo "$*"
 522                fi
 523                false
 524        fi
 525}
 526
 527# test_line_count checks that a file has the number of lines it
 528# ought to. For example:
 529#
 530#       test_expect_success 'produce exactly one line of output' '
 531#               do something >output &&
 532#               test_line_count = 1 output
 533#       '
 534#
 535# is like "test $(wc -l <output) = 1" except that it passes the
 536# output through when the number of lines is wrong.
 537
 538test_line_count () {
 539        if test $# != 3
 540        then
 541                error "bug in the test script: not 3 parameters to test_line_count"
 542        elif ! test $(wc -l <"$3") "$1" "$2"
 543        then
 544                echo "test_line_count: line count for $3 !$1 $2"
 545                cat "$3"
 546                return 1
 547        fi
 548}
 549
 550# This is not among top-level (test_expect_success | test_expect_failure)
 551# but is a prefix that can be used in the test script, like:
 552#
 553#       test_expect_success 'complain and die' '
 554#           do something &&
 555#           do something else &&
 556#           test_must_fail git checkout ../outerspace
 557#       '
 558#
 559# Writing this as "! git checkout ../outerspace" is wrong, because
 560# the failure could be due to a segv.  We want a controlled failure.
 561
 562test_must_fail () {
 563        "$@"
 564        exit_code=$?
 565        if test $exit_code = 0; then
 566                echo >&2 "test_must_fail: command succeeded: $*"
 567                return 1
 568        elif test $exit_code -gt 129 && test $exit_code -le 192; then
 569                echo >&2 "test_must_fail: died by signal: $*"
 570                return 1
 571        elif test $exit_code = 127; then
 572                echo >&2 "test_must_fail: command not found: $*"
 573                return 1
 574        elif test $exit_code = 126; then
 575                echo >&2 "test_must_fail: valgrind error: $*"
 576                return 1
 577        fi
 578        return 0
 579}
 580
 581# Similar to test_must_fail, but tolerates success, too.  This is
 582# meant to be used in contexts like:
 583#
 584#       test_expect_success 'some command works without configuration' '
 585#               test_might_fail git config --unset all.configuration &&
 586#               do something
 587#       '
 588#
 589# Writing "git config --unset all.configuration || :" would be wrong,
 590# because we want to notice if it fails due to segv.
 591
 592test_might_fail () {
 593        "$@"
 594        exit_code=$?
 595        if test $exit_code -gt 129 && test $exit_code -le 192; then
 596                echo >&2 "test_might_fail: died by signal: $*"
 597                return 1
 598        elif test $exit_code = 127; then
 599                echo >&2 "test_might_fail: command not found: $*"
 600                return 1
 601        fi
 602        return 0
 603}
 604
 605# Similar to test_must_fail and test_might_fail, but check that a
 606# given command exited with a given exit code. Meant to be used as:
 607#
 608#       test_expect_success 'Merge with d/f conflicts' '
 609#               test_expect_code 1 git merge "merge msg" B master
 610#       '
 611
 612test_expect_code () {
 613        want_code=$1
 614        shift
 615        "$@"
 616        exit_code=$?
 617        if test $exit_code = $want_code
 618        then
 619                return 0
 620        fi
 621
 622        echo >&2 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
 623        return 1
 624}
 625
 626# test_cmp is a helper function to compare actual and expected output.
 627# You can use it like:
 628#
 629#       test_expect_success 'foo works' '
 630#               echo expected >expected &&
 631#               foo >actual &&
 632#               test_cmp expected actual
 633#       '
 634#
 635# This could be written as either "cmp" or "diff -u", but:
 636# - cmp's output is not nearly as easy to read as diff -u
 637# - not all diff versions understand "-u"
 638
 639test_cmp() {
 640        $GIT_TEST_CMP "$@"
 641}
 642
 643# test_cmp_bin - helper to compare binary files
 644
 645test_cmp_bin() {
 646        cmp "$@"
 647}
 648
 649# Call any command "$@" but be more verbose about its
 650# failure. This is handy for commands like "test" which do
 651# not output anything when they fail.
 652verbose () {
 653        "$@" && return 0
 654        echo >&2 "command failed: $(git rev-parse --sq-quote "$@")"
 655        return 1
 656}
 657
 658# Check if the file expected to be empty is indeed empty, and barfs
 659# otherwise.
 660
 661test_must_be_empty () {
 662        if test -s "$1"
 663        then
 664                echo "'$1' is not empty, it contains:"
 665                cat "$1"
 666                return 1
 667        fi
 668}
 669
 670# Tests that its two parameters refer to the same revision
 671test_cmp_rev () {
 672        git rev-parse --verify "$1" >expect.rev &&
 673        git rev-parse --verify "$2" >actual.rev &&
 674        test_cmp expect.rev actual.rev
 675}
 676
 677# Print a sequence of numbers or letters in increasing order.  This is
 678# similar to GNU seq(1), but the latter might not be available
 679# everywhere (and does not do letters).  It may be used like:
 680#
 681#       for i in $(test_seq 100)
 682#       do
 683#               for j in $(test_seq 10 20)
 684#               do
 685#                       for k in $(test_seq a z)
 686#                       do
 687#                               echo $i-$j-$k
 688#                       done
 689#               done
 690#       done
 691
 692test_seq () {
 693        case $# in
 694        1)      set 1 "$@" ;;
 695        2)      ;;
 696        *)      error "bug in the test script: not 1 or 2 parameters to test_seq" ;;
 697        esac
 698        perl -le 'print for $ARGV[0]..$ARGV[1]' -- "$@"
 699}
 700
 701# This function can be used to schedule some commands to be run
 702# unconditionally at the end of the test to restore sanity:
 703#
 704#       test_expect_success 'test core.capslock' '
 705#               git config core.capslock true &&
 706#               test_when_finished "git config --unset core.capslock" &&
 707#               hello world
 708#       '
 709#
 710# That would be roughly equivalent to
 711#
 712#       test_expect_success 'test core.capslock' '
 713#               git config core.capslock true &&
 714#               hello world
 715#               git config --unset core.capslock
 716#       '
 717#
 718# except that the greeting and config --unset must both succeed for
 719# the test to pass.
 720#
 721# Note that under --immediate mode, no clean-up is done to help diagnose
 722# what went wrong.
 723
 724test_when_finished () {
 725        test_cleanup="{ $*
 726                } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 727}
 728
 729# Most tests can use the created repository, but some may need to create more.
 730# Usage: test_create_repo <directory>
 731test_create_repo () {
 732        test "$#" = 1 ||
 733        error "bug in the test script: not 1 parameter to test-create-repo"
 734        repo="$1"
 735        mkdir -p "$repo"
 736        (
 737                cd "$repo" || error "Cannot setup test environment"
 738                "$GIT_EXEC_PATH/git-init" "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
 739                error "cannot run git init -- have you built things yet?"
 740                mv .git/hooks .git/hooks-disabled
 741        ) || exit
 742}
 743
 744# This function helps on symlink challenged file systems when it is not
 745# important that the file system entry is a symbolic link.
 746# Use test_ln_s_add instead of "ln -s x y && git add y" to add a
 747# symbolic link entry y to the index.
 748
 749test_ln_s_add () {
 750        if test_have_prereq SYMLINKS
 751        then
 752                ln -s "$1" "$2" &&
 753                git update-index --add "$2"
 754        else
 755                printf '%s' "$1" >"$2" &&
 756                ln_s_obj=$(git hash-object -w "$2") &&
 757                git update-index --add --cacheinfo 120000 $ln_s_obj "$2" &&
 758                # pick up stat info from the file
 759                git update-index "$2"
 760        fi
 761}
 762
 763# This function writes out its parameters, one per line
 764test_write_lines () {
 765        printf "%s\n" "$@"
 766}
 767
 768perl () {
 769        command "$PERL_PATH" "$@"
 770}
 771
 772# Is the value one of the various ways to spell a boolean true/false?
 773test_normalize_bool () {
 774        git -c magic.variable="$1" config --bool magic.variable 2>/dev/null
 775}
 776
 777# Given a variable $1, normalize the value of it to one of "true",
 778# "false", or "auto" and store the result to it.
 779#
 780#     test_tristate GIT_TEST_HTTPD
 781#
 782# A variable set to an empty string is set to 'false'.
 783# A variable set to 'false' or 'auto' keeps its value.
 784# Anything else is set to 'true'.
 785# An unset variable defaults to 'auto'.
 786#
 787# The last rule is to allow people to set the variable to an empty
 788# string and export it to decline testing the particular feature
 789# for versions both before and after this change.  We used to treat
 790# both unset and empty variable as a signal for "do not test" and
 791# took any non-empty string as "please test".
 792
 793test_tristate () {
 794        if eval "test x\"\${$1+isset}\" = xisset"
 795        then
 796                # explicitly set
 797                eval "
 798                        case \"\$$1\" in
 799                        '')     $1=false ;;
 800                        auto)   ;;
 801                        *)      $1=\$(test_normalize_bool \$$1 || echo true) ;;
 802                        esac
 803                "
 804        else
 805                eval "$1=auto"
 806        fi
 807}
 808
 809# Exit the test suite, either by skipping all remaining tests or by
 810# exiting with an error. If "$1" is "auto", we then we assume we were
 811# opportunistically trying to set up some tests and we skip. If it is
 812# "true", then we report a failure.
 813#
 814# The error/skip message should be given by $2.
 815#
 816test_skip_or_die () {
 817        case "$1" in
 818        auto)
 819                skip_all=$2
 820                test_done
 821                ;;
 822        true)
 823                error "$2"
 824                ;;
 825        *)
 826                error "BUG: test tristate is '$1' (real error: $2)"
 827        esac
 828}
 829
 830# The following mingw_* functions obey POSIX shell syntax, but are actually
 831# bash scripts, and are meant to be used only with bash on Windows.
 832
 833# A test_cmp function that treats LF and CRLF equal and avoids to fork
 834# diff when possible.
 835mingw_test_cmp () {
 836        # Read text into shell variables and compare them. If the results
 837        # are different, use regular diff to report the difference.
 838        local test_cmp_a= test_cmp_b=
 839
 840        # When text came from stdin (one argument is '-') we must feed it
 841        # to diff.
 842        local stdin_for_diff=
 843
 844        # Since it is difficult to detect the difference between an
 845        # empty input file and a failure to read the files, we go straight
 846        # to diff if one of the inputs is empty.
 847        if test -s "$1" && test -s "$2"
 848        then
 849                # regular case: both files non-empty
 850                mingw_read_file_strip_cr_ test_cmp_a <"$1"
 851                mingw_read_file_strip_cr_ test_cmp_b <"$2"
 852        elif test -s "$1" && test "$2" = -
 853        then
 854                # read 2nd file from stdin
 855                mingw_read_file_strip_cr_ test_cmp_a <"$1"
 856                mingw_read_file_strip_cr_ test_cmp_b
 857                stdin_for_diff='<<<"$test_cmp_b"'
 858        elif test "$1" = - && test -s "$2"
 859        then
 860                # read 1st file from stdin
 861                mingw_read_file_strip_cr_ test_cmp_a
 862                mingw_read_file_strip_cr_ test_cmp_b <"$2"
 863                stdin_for_diff='<<<"$test_cmp_a"'
 864        fi
 865        test -n "$test_cmp_a" &&
 866        test -n "$test_cmp_b" &&
 867        test "$test_cmp_a" = "$test_cmp_b" ||
 868        eval "diff -u \"\$@\" $stdin_for_diff"
 869}
 870
 871# $1 is the name of the shell variable to fill in
 872mingw_read_file_strip_cr_ () {
 873        # Read line-wise using LF as the line separator
 874        # and use IFS to strip CR.
 875        local line
 876        while :
 877        do
 878                if IFS=$'\r' read -r -d $'\n' line
 879                then
 880                        # good
 881                        line=$line$'\n'
 882                else
 883                        # we get here at EOF, but also if the last line
 884                        # was not terminated by LF; in the latter case,
 885                        # some text was read
 886                        if test -z "$line"
 887                        then
 888                                # EOF, really
 889                                break
 890                        fi
 891                fi
 892                eval "$1=\$$1\$line"
 893        done
 894}