Andrew's git - gitweb.git/blob - 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.
  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        *,$1,*)
 345                return 0
 346                ;;
 347        esac
 348        return 1
 349}
 350
 351test_expect_failure () {
 352        test_start_
 353        test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 354        test "$#" = 2 ||
 355        error "bug in the test script: not 2 or 3 parameters to test-expect-failure"
 356        export test_prereq
 357        if ! test_skip "$@"
 358        then
 359                say >&3 "checking known breakage: $2"
 360                if test_run_ "$2" expecting_failure
 361                then
 362                        test_known_broken_ok_ "$1"
 363                else
 364                        test_known_broken_failure_ "$1"
 365                fi
 366        fi
 367        test_finish_
 368}
 369
 370test_expect_success () {
 371        test_start_
 372        test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 373        test "$#" = 2 ||
 374        error "bug in the test script: not 2 or 3 parameters to test-expect-success"
 375        export test_prereq
 376        if ! test_skip "$@"
 377        then
 378                say >&3 "expecting success: $2"
 379                if test_run_ "$2"
 380                then
 381                        test_ok_ "$1"
 382                else
 383                        test_failure_ "$@"
 384                fi
 385        fi
 386        test_finish_
 387}
 388
 389# test_external runs external test scripts that provide continuous
 390# test output about their progress, and succeeds/fails on
 391# zero/non-zero exit code.  It outputs the test output on stdout even
 392# in non-verbose mode, and announces the external script with "# run
 393# <n>: ..." before running it.  When providing relative paths, keep in
 394# mind that all scripts run in "trash directory".
 395# Usage: test_external description command arguments...
 396# Example: test_external 'Perl API' perl ../path/to/test.pl
 397test_external () {
 398        test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq=
 399        test "$#" = 3 ||
 400        error >&5 "bug in the test script: not 3 or 4 parameters to test_external"
 401        descr="$1"
 402        shift
 403        export test_prereq
 404        if ! test_skip "$descr" "$@"
 405        then
 406                # Announce the script to reduce confusion about the
 407                # test output that follows.
 408                say_color "" "# run $test_count: $descr ($*)"
 409                # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
 410                # to be able to use them in script
 411                export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
 412                # Run command; redirect its stderr to &4 as in
 413                # test_run_, but keep its stdout on our stdout even in
 414                # non-verbose mode.
 415                "$@" 2>&4
 416                if test "$?" = 0
 417                then
 418                        if test $test_external_has_tap -eq 0; then
 419                                test_ok_ "$descr"
 420                        else
 421                                say_color "" "# test_external test $descr was ok"
 422                                test_success=$(($test_success + 1))
 423                        fi
 424                else
 425                        if test $test_external_has_tap -eq 0; then
 426                                test_failure_ "$descr" "$@"
 427                        else
 428                                say_color error "# test_external test $descr failed: $@"
 429                                test_failure=$(($test_failure + 1))
 430                        fi
 431                fi
 432        fi
 433}
 434
 435# Like test_external, but in addition tests that the command generated
 436# no output on stderr.
 437test_external_without_stderr () {
 438        # The temporary file has no (and must have no) security
 439        # implications.
 440        tmp=${TMPDIR:-/tmp}
 441        stderr="$tmp/git-external-stderr.$$.tmp"
 442        test_external "$@" 4> "$stderr"
 443        test -f "$stderr" || error "Internal error: $stderr disappeared."
 444        descr="no stderr: $1"
 445        shift
 446        say >&3 "# expecting no stderr from previous command"
 447        if test ! -s "$stderr"
 448        then
 449                rm "$stderr"
 450
 451                if test $test_external_has_tap -eq 0; then
 452                        test_ok_ "$descr"
 453                else
 454                        say_color "" "# test_external_without_stderr test $descr was ok"
 455                        test_success=$(($test_success + 1))
 456                fi
 457        else
 458                if test "$verbose" = t
 459                then
 460                        output=$(echo; echo "# Stderr is:"; cat "$stderr")
 461                else
 462                        output=
 463                fi
 464                # rm first in case test_failure exits.
 465                rm "$stderr"
 466                if test $test_external_has_tap -eq 0; then
 467                        test_failure_ "$descr" "$@" "$output"
 468                else
 469                        say_color error "# test_external_without_stderr test $descr failed: $@: $output"
 470                        test_failure=$(($test_failure + 1))
 471                fi
 472        fi
 473}
 474
 475# debugging-friendly alternatives to "test [-f|-d|-e]"
 476# The commands test the existence or non-existence of $1. $2 can be
 477# given to provide a more precise diagnosis.
 478test_path_is_file () {
 479        if ! test -f "$1"
 480        then
 481                echo "File $1 doesn't exist. $*"
 482                false
 483        fi
 484}
 485
 486test_path_is_dir () {
 487        if ! test -d "$1"
 488        then
 489                echo "Directory $1 doesn't exist. $*"
 490                false
 491        fi
 492}
 493
 494test_path_is_missing () {
 495        if test -e "$1"
 496        then
 497                echo "Path exists:"
 498                ls -ld "$1"
 499                if test $# -ge 1
 500                then
 501                        echo "$*"
 502                fi
 503                false
 504        fi
 505}
 506
 507# test_line_count checks that a file has the number of lines it
 508# ought to. For example:
 509#
 510#       test_expect_success 'produce exactly one line of output' '
 511#               do something >output &&
 512#               test_line_count = 1 output
 513#       '
 514#
 515# is like "test $(wc -l <output) = 1" except that it passes the
 516# output through when the number of lines is wrong.
 517
 518test_line_count () {
 519        if test $# != 3
 520        then
 521                error "bug in the test script: not 3 parameters to test_line_count"
 522        elif ! test $(wc -l <"$3") "$1" "$2"
 523        then
 524                echo "test_line_count: line count for $3 !$1 $2"
 525                cat "$3"
 526                return 1
 527        fi
 528}
 529
 530# This is not among top-level (test_expect_success | test_expect_failure)
 531# but is a prefix that can be used in the test script, like:
 532#
 533#       test_expect_success 'complain and die' '
 534#           do something &&
 535#           do something else &&
 536#           test_must_fail git checkout ../outerspace
 537#       '
 538#
 539# Writing this as "! git checkout ../outerspace" is wrong, because
 540# the failure could be due to a segv.  We want a controlled failure.
 541
 542test_must_fail () {
 543        "$@"
 544        exit_code=$?
 545        if test $exit_code = 0; then
 546                echo >&2 "test_must_fail: command succeeded: $*"
 547                return 1
 548        elif test $exit_code -gt 129 -a $exit_code -le 192; then
 549                echo >&2 "test_must_fail: died by signal: $*"
 550                return 1
 551        elif test $exit_code = 127; then
 552                echo >&2 "test_must_fail: command not found: $*"
 553                return 1
 554        elif test $exit_code = 126; then
 555                echo >&2 "test_must_fail: valgrind error: $*"
 556                return 1
 557        fi
 558        return 0
 559}
 560
 561# Similar to test_must_fail, but tolerates success, too.  This is
 562# meant to be used in contexts like:
 563#
 564#       test_expect_success 'some command works without configuration' '
 565#               test_might_fail git config --unset all.configuration &&
 566#               do something
 567#       '
 568#
 569# Writing "git config --unset all.configuration || :" would be wrong,
 570# because we want to notice if it fails due to segv.
 571
 572test_might_fail () {
 573        "$@"
 574        exit_code=$?
 575        if test $exit_code -gt 129 -a $exit_code -le 192; then
 576                echo >&2 "test_might_fail: died by signal: $*"
 577                return 1
 578        elif test $exit_code = 127; then
 579                echo >&2 "test_might_fail: command not found: $*"
 580                return 1
 581        fi
 582        return 0
 583}
 584
 585# Similar to test_must_fail and test_might_fail, but check that a
 586# given command exited with a given exit code. Meant to be used as:
 587#
 588#       test_expect_success 'Merge with d/f conflicts' '
 589#               test_expect_code 1 git merge "merge msg" B master
 590#       '
 591
 592test_expect_code () {
 593        want_code=$1
 594        shift
 595        "$@"
 596        exit_code=$?
 597        if test $exit_code = $want_code
 598        then
 599                return 0
 600        fi
 601
 602        echo >&2 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
 603        return 1
 604}
 605
 606# test_cmp is a helper function to compare actual and expected output.
 607# You can use it like:
 608#
 609#       test_expect_success 'foo works' '
 610#               echo expected >expected &&
 611#               foo >actual &&
 612#               test_cmp expected actual
 613#       '
 614#
 615# This could be written as either "cmp" or "diff -u", but:
 616# - cmp's output is not nearly as easy to read as diff -u
 617# - not all diff versions understand "-u"
 618
 619test_cmp() {
 620        $GIT_TEST_CMP "$@"
 621}
 622
 623# test_cmp_bin - helper to compare binary files
 624
 625test_cmp_bin() {
 626        cmp "$@"
 627}
 628
 629# Check if the file expected to be empty is indeed empty, and barfs
 630# otherwise.
 631
 632test_must_be_empty () {
 633        if test -s "$1"
 634        then
 635                echo "'$1' is not empty, it contains:"
 636                cat "$1"
 637                return 1
 638        fi
 639}
 640
 641# Tests that its two parameters refer to the same revision
 642test_cmp_rev () {
 643        git rev-parse --verify "$1" >expect.rev &&
 644        git rev-parse --verify "$2" >actual.rev &&
 645        test_cmp expect.rev actual.rev
 646}
 647
 648# Print a sequence of numbers or letters in increasing order.  This is
 649# similar to GNU seq(1), but the latter might not be available
 650# everywhere (and does not do letters).  It may be used like:
 651#
 652#       for i in $(test_seq 100)
 653#       do
 654#               for j in $(test_seq 10 20)
 655#               do
 656#                       for k in $(test_seq a z)
 657#                       do
 658#                               echo $i-$j-$k
 659#                       done
 660#               done
 661#       done
 662
 663test_seq () {
 664        case $# in
 665        1)      set 1 "$@" ;;
 666        2)      ;;
 667        *)      error "bug in the test script: not 1 or 2 parameters to test_seq" ;;
 668        esac
 669        perl -le 'print for $ARGV[0]..$ARGV[1]' -- "$@"
 670}
 671
 672# This function can be used to schedule some commands to be run
 673# unconditionally at the end of the test to restore sanity:
 674#
 675#       test_expect_success 'test core.capslock' '
 676#               git config core.capslock true &&
 677#               test_when_finished "git config --unset core.capslock" &&
 678#               hello world
 679#       '
 680#
 681# That would be roughly equivalent to
 682#
 683#       test_expect_success 'test core.capslock' '
 684#               git config core.capslock true &&
 685#               hello world
 686#               git config --unset core.capslock
 687#       '
 688#
 689# except that the greeting and config --unset must both succeed for
 690# the test to pass.
 691#
 692# Note that under --immediate mode, no clean-up is done to help diagnose
 693# what went wrong.
 694
 695test_when_finished () {
 696        test_cleanup="{ $*
 697                } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 698}
 699
 700# Most tests can use the created repository, but some may need to create more.
 701# Usage: test_create_repo <directory>
 702test_create_repo () {
 703        test "$#" = 1 ||
 704        error "bug in the test script: not 1 parameter to test-create-repo"
 705        repo="$1"
 706        mkdir -p "$repo"
 707        (
 708                cd "$repo" || error "Cannot setup test environment"
 709                "$GIT_EXEC_PATH/git-init" "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
 710                error "cannot run git init -- have you built things yet?"
 711                mv .git/hooks .git/hooks-disabled
 712        ) || exit
 713}
 714
 715# This function helps on symlink challenged file systems when it is not
 716# important that the file system entry is a symbolic link.
 717# Use test_ln_s_add instead of "ln -s x y && git add y" to add a
 718# symbolic link entry y to the index.
 719
 720test_ln_s_add () {
 721        if test_have_prereq SYMLINKS
 722        then
 723                ln -s "$1" "$2" &&
 724                git update-index --add "$2"
 725        else
 726                printf '%s' "$1" >"$2" &&
 727                ln_s_obj=$(git hash-object -w "$2") &&
 728                git update-index --add --cacheinfo 120000 $ln_s_obj "$2"
 729        fi
 730}
 731
 732perl () {
 733        command "$PERL_PATH" "$@"
 734}
 735
 736# Is the value one of the various ways to spell a boolean true/false?
 737test_normalize_bool () {
 738        git -c magic.variable="$1" config --bool magic.variable 2>/dev/null
 739}
 740
 741# Given a variable $1, normalize the value of it to one of "true",
 742# "false", or "auto" and store the result to it.
 743#
 744#     test_tristate GIT_TEST_HTTPD
 745#
 746# A variable set to an empty string is set to 'false'.
 747# A variable set to 'false' or 'auto' keeps its value.
 748# Anything else is set to 'true'.
 749# An unset variable defaults to 'auto'.
 750#
 751# The last rule is to allow people to set the variable to an empty
 752# string and export it to decline testing the particular feature
 753# for versions both before and after this change.  We used to treat
 754# both unset and empty variable as a signal for "do not test" and
 755# took any non-empty string as "please test".
 756
 757test_tristate () {
 758        if eval "test x\"\${$1+isset}\" = xisset"
 759        then
 760                # explicitly set
 761                eval "
 762                        case \"\$$1\" in
 763                        '')     $1=false ;;
 764                        auto)   ;;
 765                        *)      $1=\$(test_normalize_bool \$$1 || echo true) ;;
 766                        esac
 767                "
 768        else
 769                eval "$1=auto"
 770        fi
 771}
 772
 773# Exit the test suite, either by skipping all remaining tests or by
 774# exiting with an error. If "$1" is "auto", we then we assume we were
 775# opportunistically trying to set up some tests and we skip. If it is
 776# "true", then we report a failure.
 777#
 778# The error/skip message should be given by $2.
 779#
 780test_skip_or_die () {
 781        case "$1" in
 782        auto)
 783                skip_all=$2
 784                test_done
 785                ;;
 786        true)
 787                error "$2"
 788                ;;
 789        *)
 790                error "BUG: test tristate is '$1' (real error: $2)"
 791        esac
 792}
 793
 794# The following mingw_* functions obey POSIX shell syntax, but are actually
 795# bash scripts, and are meant to be used only with bash on Windows.
 796
 797# A test_cmp function that treats LF and CRLF equal and avoids to fork
 798# diff when possible.
 799mingw_test_cmp () {
 800        # Read text into shell variables and compare them. If the results
 801        # are different, use regular diff to report the difference.
 802        local test_cmp_a= test_cmp_b=
 803
 804        # When text came from stdin (one argument is '-') we must feed it
 805        # to diff.
 806        local stdin_for_diff=
 807
 808        # Since it is difficult to detect the difference between an
 809        # empty input file and a failure to read the files, we go straight
 810        # to diff if one of the inputs is empty.
 811        if test -s "$1" && test -s "$2"
 812        then
 813                # regular case: both files non-empty
 814                mingw_read_file_strip_cr_ test_cmp_a <"$1"
 815                mingw_read_file_strip_cr_ test_cmp_b <"$2"
 816        elif test -s "$1" && test "$2" = -
 817        then
 818                # read 2nd file from stdin
 819                mingw_read_file_strip_cr_ test_cmp_a <"$1"
 820                mingw_read_file_strip_cr_ test_cmp_b
 821                stdin_for_diff='<<<"$test_cmp_b"'
 822        elif test "$1" = - && test -s "$2"
 823        then
 824                # read 1st file from stdin
 825                mingw_read_file_strip_cr_ test_cmp_a
 826                mingw_read_file_strip_cr_ test_cmp_b <"$2"
 827                stdin_for_diff='<<<"$test_cmp_a"'
 828        fi
 829        test -n "$test_cmp_a" &&
 830        test -n "$test_cmp_b" &&
 831        test "$test_cmp_a" = "$test_cmp_b" ||
 832        eval "diff -u \"\$@\" $stdin_for_diff"
 833}
 834
 835# $1 is the name of the shell variable to fill in
 836mingw_read_file_strip_cr_ () {
 837        # Read line-wise using LF as the line separator
 838        # and use IFS to strip CR.
 839        local line
 840        while :
 841        do
 842                if IFS=$'\r' read -r -d $'\n' line
 843                then
 844                        # good
 845                        line=$line$'\n'
 846                else
 847                        # we get here at EOF, but also if the last line
 848                        # was not terminated by LF; in the latter case,
 849                        # some text was read
 850                        if test -z "$line"
 851                        then
 852                                # EOF, really
 853                                break
 854                        fi
 855                fi
 856                eval "$1=\$$1\$line"
 857        done
 858}