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 == 2) return "FAINT";
  46                         if (n == 3) return "ITALIC";
  47                         if (n == 7) return "REVERSE";
  48                         if (n == 30) return "BLACK";
  49                         if (n == 31) return "RED";
  50                         if (n == 32) return "GREEN";
  51                         if (n == 33) return "YELLOW";
  52                         if (n == 34) return "BLUE";
  53                         if (n == 35) return "MAGENTA";
  54                         if (n == 36) return "CYAN";
  55                         if (n == 37) return "WHITE";
  56                         if (n == 40) return "BLACK";
  57                         if (n == 41) return "BRED";
  58                         if (n == 42) return "BGREEN";
  59                         if (n == 43) return "BYELLOW";
  60                         if (n == 44) return "BBLUE";
  61                         if (n == 45) return "BMAGENTA";
  62                         if (n == 46) return "BCYAN";
  63                         if (n == 47) return "BWHITE";
  64                 }
  65                 {
  66                         while (match($0, /\033\[[0-9;]*m/) != 0) {
  67                                 printf "%s<", substr($0, 1, RSTART-1);
  68                                 codes = substr($0, RSTART+2, RLENGTH-3);
  69                                 if (length(codes) == 0)
  70                                         printf "%s", name(0)
  71                                 else {
  72                                         n = split(codes, ary, ";");
  73                                         sep = "";
  74                                         for (i = 1; i <= n; i++) {
  75                                                 printf "%s%s", sep, name(ary[i]);
  76                                                 sep = ";"
  77                                         }
  78                                 }
  79                                 printf ">";
  80                                 $0 = substr($0, RSTART + RLENGTH, length($0) - RSTART - RLENGTH + 1);
  81                         }
  82                         print
  83                 }
  84         '
  85 }
  86
  87 lf_to_nul () {
  88         perl -pe 'y/\012/\000/'
  89 }
  90
  91 nul_to_q () {
  92         perl -pe 'y/\000/Q/'
  93 }
  94
  95 q_to_nul () {
  96         perl -pe 'y/Q/\000/'
  97 }
  98
  99 q_to_cr () {
 100         tr Q '\015'
 101 }
 102
 103 q_to_tab () {
 104         tr Q '\011'
 105 }
 106
 107 qz_to_tab_space () {
 108         tr QZ '\011\040'
 109 }
 110
 111 append_cr () {
 112         sed -e 's/$/Q/' | tr Q '\015'
 113 }
 114
 115 remove_cr () {
 116         tr '\015' Q | sed -e 's/Q$//'
 117 }
 118
 119 # In some bourne shell implementations, the "unset" builtin returns
 120 # nonzero status when a variable to be unset was not set in the first
 121 # place.
 122 #
 123 # Use sane_unset when that should not be considered an error.
 124
 125 sane_unset () {
 126         unset "$@"
 127         return 0
 128 }
 129
 130 test_tick () {
 131         if test -z "${test_tick+set}"
 132         then
 133                 test_tick=1112911993
 134         else
 135                 test_tick=$(($test_tick + 60))
 136         fi
 137         GIT_COMMITTER_DATE="$test_tick -0700"
 138         GIT_AUTHOR_DATE="$test_tick -0700"
 139         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 140 }
 141
 142 # Stop execution and start a shell. This is useful for debugging tests.
 143 #
 144 # Be sure to remove all invocations of this command before submitting.
 145
 146 test_pause () {
 147         "$SHELL_PATH" <&6 >&5 2>&7
 148 }
 149
 150 # Wrap git with a debugger. Adding this to a command can make it easier
 151 # to understand what is going on in a failing test.
 152 #
 153 # Examples:
 154 #     debug git checkout master
 155 #     debug --debugger=nemiver git $ARGS
 156 #     debug -d "valgrind --tool=memcheck --track-origins=yes" git $ARGS
 157 debug () {
 158         case "$1" in
 159         -d)
 160                 GIT_DEBUGGER="$2" &&
 161                 shift 2
 162                 ;;
 163         --debugger=*)
 164                 GIT_DEBUGGER="${1#*=}" &&
 165                 shift 1
 166                 ;;
 167         *)
 168                 GIT_DEBUGGER=1
 169                 ;;
 170         esac &&
 171         GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7
 172 }
 173
 174 # Call test_commit with the arguments
 175 # [-C <directory>] <message> [<file> [<contents> [<tag>]]]"
 176 #
 177 # This will commit a file with the given contents and the given commit
 178 # message, and tag the resulting commit with the given tag name.
 179 #
 180 # <file>, <contents>, and <tag> all default to <message>.
 181 #
 182 # If the first argument is "-C", the second argument is used as a path for
 183 # the git invocations.
 184
 185 test_commit () {
 186         notick= &&
 187         signoff= &&
 188         indir= &&
 189         while test $# != 0
 190         do
 191                 case "$1" in
 192                 --notick)
 193                         notick=yes
 194                         ;;
 195                 --signoff)
 196                         signoff="$1"
 197                         ;;
 198                 -C)
 199                         indir="$2"
 200                         shift
 201                         ;;
 202                 *)
 203                         break
 204                         ;;
 205                 esac
 206                 shift
 207         done &&
 208         indir=${indir:+"$indir"/} &&
 209         file=${2:-"$1.t"} &&
 210         echo "${3-$1}" > "$indir$file" &&
 211         git ${indir:+ -C "$indir"} add "$file" &&
 212         if test -z "$notick"
 213         then
 214                 test_tick
 215         fi &&
 216         git ${indir:+ -C "$indir"} commit $signoff -m "$1" &&
 217         git ${indir:+ -C "$indir"} tag "${4:-$1}"
 218 }
 219
 220 # Call test_merge with the arguments "<message> <commit>", where <commit>
 221 # can be a tag pointing to the commit-to-merge.
 222
 223 test_merge () {
 224         test_tick &&
 225         git merge -m "$1" "$2" &&
 226         git tag "$1"
 227 }
 228
 229 # This function helps systems where core.filemode=false is set.
 230 # Use it instead of plain 'chmod +x' to set or unset the executable bit
 231 # of a file in the working directory and add it to the index.
 232
 233 test_chmod () {
 234         chmod "$@" &&
 235         git update-index --add "--chmod=$@"
 236 }
 237
 238 # Get the modebits from a file.
 239 test_modebits () {
 240         ls -l "$1" | sed -e 's|^\(..........\).*|\1|'
 241 }
 242
 243 # Unset a configuration variable, but don't fail if it doesn't exist.
 244 test_unconfig () {
 245         config_dir=
 246         if test "$1" = -C
 247         then
 248                 shift
 249                 config_dir=$1
 250                 shift
 251         fi
 252         git ${config_dir:+-C "$config_dir"} config --unset-all "$@"
 253         config_status=$?
 254         case "$config_status" in
 255         5) # ok, nothing to unset
 256                 config_status=0
 257                 ;;
 258         esac
 259         return $config_status
 260 }
 261
 262 # Set git config, automatically unsetting it after the test is over.
 263 test_config () {
 264         config_dir=
 265         if test "$1" = -C
 266         then
 267                 shift
 268                 config_dir=$1
 269                 shift
 270         fi
 271         test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" &&
 272         git ${config_dir:+-C "$config_dir"} config "$@"
 273 }
 274
 275 test_config_global () {
 276         test_when_finished "test_unconfig --global '$1'" &&
 277         git config --global "$@"
 278 }
 279
 280 write_script () {
 281         {
 282                 echo "#!${2-"$SHELL_PATH"}" &&
 283                 cat
 284         } >"$1" &&
 285         chmod +x "$1"
 286 }
 287
 288 # Use test_set_prereq to tell that a particular prerequisite is available.
 289 # The prerequisite can later be checked for in two ways:
 290 #
 291 # - Explicitly using test_have_prereq.
 292 #
 293 # - Implicitly by specifying the prerequisite tag in the calls to
 294 #   test_expect_{success,failure,code}.
 295 #
 296 # The single parameter is the prerequisite tag (a simple word, in all
 297 # capital letters by convention).
 298
 299 test_unset_prereq () {
 300         ! test_have_prereq "$1" ||
 301         satisfied_prereq="${satisfied_prereq% $1 *} ${satisfied_prereq#* $1 }"
 302 }
 303
 304 test_set_prereq () {
 305         case "$1" in
 306         !*)
 307                 test_unset_prereq "${1#!}"
 308                 ;;
 309         *)
 310                 satisfied_prereq="$satisfied_prereq$1 "
 311                 ;;
 312         esac
 313 }
 314 satisfied_prereq=" "
 315 lazily_testable_prereq= lazily_tested_prereq=
 316
 317 # Usage: test_lazy_prereq PREREQ 'script'
 318 test_lazy_prereq () {
 319         lazily_testable_prereq="$lazily_testable_prereq$1 "
 320         eval test_prereq_lazily_$1=\$2
 321 }
 322
 323 test_run_lazy_prereq_ () {
 324         script='
 325 mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" &&
 326 (
 327         cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"'
 328 )'
 329         say >&3 "checking prerequisite: $1"
 330         say >&3 "$script"
 331         test_eval_ "$script"
 332         eval_ret=$?
 333         rm -rf "$TRASH_DIRECTORY/prereq-test-dir"
 334         if test "$eval_ret" = 0; then
 335                 say >&3 "prerequisite $1 ok"
 336         else
 337                 say >&3 "prerequisite $1 not satisfied"
 338         fi
 339         return $eval_ret
 340 }
 341
 342 test_have_prereq () {
 343         # prerequisites can be concatenated with ','
 344         save_IFS=$IFS
 345         IFS=,
 346         set -- $*
 347         IFS=$save_IFS
 348
 349         total_prereq=0
 350         ok_prereq=0
 351         missing_prereq=
 352
 353         for prerequisite
 354         do
 355                 case "$prerequisite" in
 356                 !*)
 357                         negative_prereq=t
 358                         prerequisite=${prerequisite#!}
 359                         ;;
 360                 *)
 361                         negative_prereq=
 362                 esac
 363
 364                 case " $lazily_tested_prereq " in
 365                 *" $prerequisite "*)
 366                         ;;
 367                 *)
 368                         case " $lazily_testable_prereq " in
 369                         *" $prerequisite "*)
 370                                 eval "script=\$test_prereq_lazily_$prerequisite" &&
 371                                 if test_run_lazy_prereq_ "$prerequisite" "$script"
 372                                 then
 373                                         test_set_prereq $prerequisite
 374                                 fi
 375                                 lazily_tested_prereq="$lazily_tested_prereq$prerequisite "
 376                         esac
 377                         ;;
 378                 esac
 379
 380                 total_prereq=$(($total_prereq + 1))
 381                 case "$satisfied_prereq" in
 382                 *" $prerequisite "*)
 383                         satisfied_this_prereq=t
 384                         ;;
 385                 *)
 386                         satisfied_this_prereq=
 387                 esac
 388
 389                 case "$satisfied_this_prereq,$negative_prereq" in
 390                 t,|,t)
 391                         ok_prereq=$(($ok_prereq + 1))
 392                         ;;
 393                 *)
 394                         # Keep a list of missing prerequisites; restore
 395                         # the negative marker if necessary.
 396                         prerequisite=${negative_prereq:+!}$prerequisite
 397                         if test -z "$missing_prereq"
 398                         then
 399                                 missing_prereq=$prerequisite
 400                         else
 401                                 missing_prereq="$prerequisite,$missing_prereq"
 402                         fi
 403                 esac
 404         done
 405
 406         test $total_prereq = $ok_prereq
 407 }
 408
 409 test_declared_prereq () {
 410         case ",$test_prereq," in
 411         *,$1,*)
 412                 return 0
 413                 ;;
 414         esac
 415         return 1
 416 }
 417
 418 test_verify_prereq () {
 419         test -z "$test_prereq" ||
 420         expr >/dev/null "$test_prereq" : '[A-Z0-9_,!]*$' ||
 421         BUG "'$test_prereq' does not look like a prereq"
 422 }
 423
 424 test_expect_failure () {
 425         test_start_
 426         test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 427         test "$#" = 2 ||
 428         BUG "not 2 or 3 parameters to test-expect-failure"
 429         test_verify_prereq
 430         export test_prereq
 431         if ! test_skip "$@"
 432         then
 433                 say >&3 "checking known breakage: $2"
 434                 if test_run_ "$2" expecting_failure
 435                 then
 436                         test_known_broken_ok_ "$1"
 437                 else
 438                         test_known_broken_failure_ "$1"
 439                 fi
 440         fi
 441         test_finish_
 442 }
 443
 444 test_expect_success () {
 445         test_start_
 446         test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 447         test "$#" = 2 ||
 448         BUG "not 2 or 3 parameters to test-expect-success"
 449         test_verify_prereq
 450         export test_prereq
 451         if ! test_skip "$@"
 452         then
 453                 say >&3 "expecting success: $2"
 454                 if test_run_ "$2"
 455                 then
 456                         test_ok_ "$1"
 457                 else
 458                         test_failure_ "$@"
 459                 fi
 460         fi
 461         test_finish_
 462 }
 463
 464 # test_external runs external test scripts that provide continuous
 465 # test output about their progress, and succeeds/fails on
 466 # zero/non-zero exit code.  It outputs the test output on stdout even
 467 # in non-verbose mode, and announces the external script with "# run
 468 # <n>: ..." before running it.  When providing relative paths, keep in
 469 # mind that all scripts run in "trash directory".
 470 # Usage: test_external description command arguments...
 471 # Example: test_external 'Perl API' perl ../path/to/test.pl
 472 test_external () {
 473         test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq=
 474         test "$#" = 3 ||
 475         BUG "not 3 or 4 parameters to test_external"
 476         descr="$1"
 477         shift
 478         test_verify_prereq
 479         export test_prereq
 480         if ! test_skip "$descr" "$@"
 481         then
 482                 # Announce the script to reduce confusion about the
 483                 # test output that follows.
 484                 say_color "" "# run $test_count: $descr ($*)"
 485                 # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
 486                 # to be able to use them in script
 487                 export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
 488                 # Run command; redirect its stderr to &4 as in
 489                 # test_run_, but keep its stdout on our stdout even in
 490                 # non-verbose mode.
 491                 "$@" 2>&4
 492                 if test "$?" = 0
 493                 then
 494                         if test $test_external_has_tap -eq 0; then
 495                                 test_ok_ "$descr"
 496                         else
 497                                 say_color "" "# test_external test $descr was ok"
 498                                 test_success=$(($test_success + 1))
 499                         fi
 500                 else
 501                         if test $test_external_has_tap -eq 0; then
 502                                 test_failure_ "$descr" "$@"
 503                         else
 504                                 say_color error "# test_external test $descr failed: $@"
 505                                 test_failure=$(($test_failure + 1))
 506                         fi
 507                 fi
 508         fi
 509 }
 510
 511 # Like test_external, but in addition tests that the command generated
 512 # no output on stderr.
 513 test_external_without_stderr () {
 514         # The temporary file has no (and must have no) security
 515         # implications.
 516         tmp=${TMPDIR:-/tmp}
 517         stderr="$tmp/git-external-stderr.$$.tmp"
 518         test_external "$@" 4> "$stderr"
 519         test -f "$stderr" || error "Internal error: $stderr disappeared."
 520         descr="no stderr: $1"
 521         shift
 522         say >&3 "# expecting no stderr from previous command"
 523         if test ! -s "$stderr"
 524         then
 525                 rm "$stderr"
 526
 527                 if test $test_external_has_tap -eq 0; then
 528                         test_ok_ "$descr"
 529                 else
 530                         say_color "" "# test_external_without_stderr test $descr was ok"
 531                         test_success=$(($test_success + 1))
 532                 fi
 533         else
 534                 if test "$verbose" = t
 535                 then
 536                         output=$(echo; echo "# Stderr is:"; cat "$stderr")
 537                 else
 538                         output=
 539                 fi
 540                 # rm first in case test_failure exits.
 541                 rm "$stderr"
 542                 if test $test_external_has_tap -eq 0; then
 543                         test_failure_ "$descr" "$@" "$output"
 544                 else
 545                         say_color error "# test_external_without_stderr test $descr failed: $@: $output"
 546                         test_failure=$(($test_failure + 1))
 547                 fi
 548         fi
 549 }
 550
 551 # debugging-friendly alternatives to "test [-f|-d|-e]"
 552 # The commands test the existence or non-existence of $1. $2 can be
 553 # given to provide a more precise diagnosis.
 554 test_path_is_file () {
 555         if ! test -f "$1"
 556         then
 557                 echo "File $1 doesn't exist. $2"
 558                 false
 559         fi
 560 }
 561
 562 test_path_is_dir () {
 563         if ! test -d "$1"
 564         then
 565                 echo "Directory $1 doesn't exist. $2"
 566                 false
 567         fi
 568 }
 569
 570 test_path_exists () {
 571         if ! test -e "$1"
 572         then
 573                 echo "Path $1 doesn't exist. $2"
 574                 false
 575         fi
 576 }
 577
 578 # Check if the directory exists and is empty as expected, barf otherwise.
 579 test_dir_is_empty () {
 580         test_path_is_dir "$1" &&
 581         if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
 582         then
 583                 echo "Directory '$1' is not empty, it contains:"
 584                 ls -la "$1"
 585                 return 1
 586         fi
 587 }
 588
 589 test_path_is_missing () {
 590         if test -e "$1"
 591         then
 592                 echo "Path exists:"
 593                 ls -ld "$1"
 594                 if test $# -ge 1
 595                 then
 596                         echo "$*"
 597                 fi
 598                 false
 599         fi
 600 }
 601
 602 # test_line_count checks that a file has the number of lines it
 603 # ought to. For example:
 604 #
 605 #       test_expect_success 'produce exactly one line of output' '
 606 #               do something >output &&
 607 #               test_line_count = 1 output
 608 #       '
 609 #
 610 # is like "test $(wc -l <output) = 1" except that it passes the
 611 # output through when the number of lines is wrong.
 612
 613 test_line_count () {
 614         if test $# != 3
 615         then
 616                 BUG "not 3 parameters to test_line_count"
 617         elif ! test $(wc -l <"$3") "$1" "$2"
 618         then
 619                 echo "test_line_count: line count for $3 !$1 $2"
 620                 cat "$3"
 621                 return 1
 622         fi
 623 }
 624
 625 # Returns success if a comma separated string of keywords ($1) contains a
 626 # given keyword ($2).
 627 # Examples:
 628 # `list_contains "foo,bar" bar` returns 0
 629 # `list_contains "foo" bar` returns 1
 630
 631 list_contains () {
 632         case ",$1," in
 633         *,$2,*)
 634                 return 0
 635                 ;;
 636         esac
 637         return 1
 638 }
 639
 640 # This is not among top-level (test_expect_success | test_expect_failure)
 641 # but is a prefix that can be used in the test script, like:
 642 #
 643 #       test_expect_success 'complain and die' '
 644 #           do something &&
 645 #           do something else &&
 646 #           test_must_fail git checkout ../outerspace
 647 #       '
 648 #
 649 # Writing this as "! git checkout ../outerspace" is wrong, because
 650 # the failure could be due to a segv.  We want a controlled failure.
 651 #
 652 # Accepts the following options:
 653 #
 654 #   ok=<signal-name>[,<...>]:
 655 #     Don't treat an exit caused by the given signal as error.
 656 #     Multiple signals can be specified as a comma separated list.
 657 #     Currently recognized signal names are: sigpipe, success.
 658 #     (Don't use 'success', use 'test_might_fail' instead.)
 659
 660 test_must_fail () {
 661         case "$1" in
 662         ok=*)
 663                 _test_ok=${1#ok=}
 664                 shift
 665                 ;;
 666         *)
 667                 _test_ok=
 668                 ;;
 669         esac
 670         "$@" 2>&7
 671         exit_code=$?
 672         if test $exit_code -eq 0 && ! list_contains "$_test_ok" success
 673         then
 674                 echo >&4 "test_must_fail: command succeeded: $*"
 675                 return 1
 676         elif test_match_signal 13 $exit_code && list_contains "$_test_ok" sigpipe
 677         then
 678                 return 0
 679         elif test $exit_code -gt 129 && test $exit_code -le 192
 680         then
 681                 echo >&4 "test_must_fail: died by signal $(($exit_code - 128)): $*"
 682                 return 1
 683         elif test $exit_code -eq 127
 684         then
 685                 echo >&4 "test_must_fail: command not found: $*"
 686                 return 1
 687         elif test $exit_code -eq 126
 688         then
 689                 echo >&4 "test_must_fail: valgrind error: $*"
 690                 return 1
 691         fi
 692         return 0
 693 } 7>&2 2>&4
 694
 695 # Similar to test_must_fail, but tolerates success, too.  This is
 696 # meant to be used in contexts like:
 697 #
 698 #       test_expect_success 'some command works without configuration' '
 699 #               test_might_fail git config --unset all.configuration &&
 700 #               do something
 701 #       '
 702 #
 703 # Writing "git config --unset all.configuration || :" would be wrong,
 704 # because we want to notice if it fails due to segv.
 705 #
 706 # Accepts the same options as test_must_fail.
 707
 708 test_might_fail () {
 709         test_must_fail ok=success "$@" 2>&7
 710 } 7>&2 2>&4
 711
 712 # Similar to test_must_fail and test_might_fail, but check that a
 713 # given command exited with a given exit code. Meant to be used as:
 714 #
 715 #       test_expect_success 'Merge with d/f conflicts' '
 716 #               test_expect_code 1 git merge "merge msg" B master
 717 #       '
 718
 719 test_expect_code () {
 720         want_code=$1
 721         shift
 722         "$@" 2>&7
 723         exit_code=$?
 724         if test $exit_code = $want_code
 725         then
 726                 return 0
 727         fi
 728
 729         echo >&4 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
 730         return 1
 731 } 7>&2 2>&4
 732
 733 # test_cmp is a helper function to compare actual and expected output.
 734 # You can use it like:
 735 #
 736 #       test_expect_success 'foo works' '
 737 #               echo expected >expected &&
 738 #               foo >actual &&
 739 #               test_cmp expected actual
 740 #       '
 741 #
 742 # This could be written as either "cmp" or "diff -u", but:
 743 # - cmp's output is not nearly as easy to read as diff -u
 744 # - not all diff versions understand "-u"
 745
 746 test_cmp() {
 747         $GIT_TEST_CMP "$@"
 748 }
 749
 750 # Check that the given config key has the expected value.
 751 #
 752 #    test_cmp_config [-C <dir>] <expected-value>
 753 #                    [<git-config-options>...] <config-key>
 754 #
 755 # for example to check that the value of core.bar is foo
 756 #
 757 #    test_cmp_config foo core.bar
 758 #
 759 test_cmp_config() {
 760         local GD &&
 761         if test "$1" = "-C"
 762         then
 763                 shift &&
 764                 GD="-C $1" &&
 765                 shift
 766         fi &&
 767         printf "%s\n" "$1" >expect.config &&
 768         shift &&
 769         git $GD config "$@" >actual.config &&
 770         test_cmp expect.config actual.config
 771 }
 772
 773 # test_cmp_bin - helper to compare binary files
 774
 775 test_cmp_bin() {
 776         cmp "$@"
 777 }
 778
 779 # Use this instead of test_cmp to compare files that contain expected and
 780 # actual output from git commands that can be translated.  When running
 781 # under GIT_TEST_GETTEXT_POISON this pretends that the command produced expected
 782 # results.
 783 test_i18ncmp () {
 784         ! test_have_prereq C_LOCALE_OUTPUT || test_cmp "$@"
 785 }
 786
 787 # Use this instead of "grep expected-string actual" to see if the
 788 # output from a git command that can be translated either contains an
 789 # expected string, or does not contain an unwanted one.  When running
 790 # under GIT_TEST_GETTEXT_POISON this pretends that the command produced expected
 791 # results.
 792 test_i18ngrep () {
 793         eval "last_arg=\${$#}"
 794
 795         test -f "$last_arg" ||
 796         BUG "test_i18ngrep requires a file to read as the last parameter"
 797
 798         if test $# -lt 2 ||
 799            { test "x!" = "x$1" && test $# -lt 3 ; }
 800         then
 801                 BUG "too few parameters to test_i18ngrep"
 802         fi
 803
 804         if test_have_prereq !C_LOCALE_OUTPUT
 805         then
 806                 # pretend success
 807                 return 0
 808         fi
 809
 810         if test "x!" = "x$1"
 811         then
 812                 shift
 813                 ! grep "$@" && return 0
 814
 815                 echo >&4 "error: '! grep $@' did find a match in:"
 816         else
 817                 grep "$@" && return 0
 818
 819                 echo >&4 "error: 'grep $@' didn't find a match in:"
 820         fi
 821
 822         if test -s "$last_arg"
 823         then
 824                 cat >&4 "$last_arg"
 825         else
 826                 echo >&4 "<File '$last_arg' is empty>"
 827         fi
 828
 829         return 1
 830 }
 831
 832 # Call any command "$@" but be more verbose about its
 833 # failure. This is handy for commands like "test" which do
 834 # not output anything when they fail.
 835 verbose () {
 836         "$@" && return 0
 837         echo >&4 "command failed: $(git rev-parse --sq-quote "$@")"
 838         return 1
 839 }
 840
 841 # Check if the file expected to be empty is indeed empty, and barfs
 842 # otherwise.
 843
 844 test_must_be_empty () {
 845         test_path_is_file "$1" &&
 846         if test -s "$1"
 847         then
 848                 echo "'$1' is not empty, it contains:"
 849                 cat "$1"
 850                 return 1
 851         fi
 852 }
 853
 854 # Tests that its two parameters refer to the same revision
 855 test_cmp_rev () {
 856         if test $# != 2
 857         then
 858                 error "bug in the test script: test_cmp_rev requires two revisions, but got $#"
 859         else
 860                 local r1 r2
 861                 r1=$(git rev-parse --verify "$1") &&
 862                 r2=$(git rev-parse --verify "$2") &&
 863                 if test "$r1" != "$r2"
 864                 then
 865                         cat >&4 <<-EOF
 866                         error: two revisions point to different objects:
 867                           '$1': $r1
 868                           '$2': $r2
 869                         EOF
 870                         return 1
 871                 fi
 872         fi
 873 }
 874
 875 # Print a sequence of integers in increasing order, either with
 876 # two arguments (start and end):
 877 #
 878 #     test_seq 1 5 -- outputs 1 2 3 4 5 one line at a time
 879 #
 880 # or with one argument (end), in which case it starts counting
 881 # from 1.
 882
 883 test_seq () {
 884         case $# in
 885         1)      set 1 "$@" ;;
 886         2)      ;;
 887         *)      BUG "not 1 or 2 parameters to test_seq" ;;
 888         esac
 889         test_seq_counter__=$1
 890         while test "$test_seq_counter__" -le "$2"
 891         do
 892                 echo "$test_seq_counter__"
 893                 test_seq_counter__=$(( $test_seq_counter__ + 1 ))
 894         done
 895 }
 896
 897 # This function can be used to schedule some commands to be run
 898 # unconditionally at the end of the test to restore sanity:
 899 #
 900 #       test_expect_success 'test core.capslock' '
 901 #               git config core.capslock true &&
 902 #               test_when_finished "git config --unset core.capslock" &&
 903 #               hello world
 904 #       '
 905 #
 906 # That would be roughly equivalent to
 907 #
 908 #       test_expect_success 'test core.capslock' '
 909 #               git config core.capslock true &&
 910 #               hello world
 911 #               git config --unset core.capslock
 912 #       '
 913 #
 914 # except that the greeting and config --unset must both succeed for
 915 # the test to pass.
 916 #
 917 # Note that under --immediate mode, no clean-up is done to help diagnose
 918 # what went wrong.
 919
 920 test_when_finished () {
 921         # We cannot detect when we are in a subshell in general, but by
 922         # doing so on Bash is better than nothing (the test will
 923         # silently pass on other shells).
 924         test "${BASH_SUBSHELL-0}" = 0 ||
 925         BUG "test_when_finished does nothing in a subshell"
 926         test_cleanup="{ $*
 927                 } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 928 }
 929
 930 # Most tests can use the created repository, but some may need to create more.
 931 # Usage: test_create_repo <directory>
 932 test_create_repo () {
 933         test "$#" = 1 ||
 934         BUG "not 1 parameter to test-create-repo"
 935         repo="$1"
 936         mkdir -p "$repo"
 937         (
 938                 cd "$repo" || error "Cannot setup test environment"
 939                 "${GIT_TEST_INSTALLED:-$GIT_EXEC_PATH}/git$X" init \
 940                         "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
 941                 error "cannot run git init -- have you built things yet?"
 942                 mv .git/hooks .git/hooks-disabled
 943         ) || exit
 944 }
 945
 946 # This function helps on symlink challenged file systems when it is not
 947 # important that the file system entry is a symbolic link.
 948 # Use test_ln_s_add instead of "ln -s x y && git add y" to add a
 949 # symbolic link entry y to the index.
 950
 951 test_ln_s_add () {
 952         if test_have_prereq SYMLINKS
 953         then
 954                 ln -s "$1" "$2" &&
 955                 git update-index --add "$2"
 956         else
 957                 printf '%s' "$1" >"$2" &&
 958                 ln_s_obj=$(git hash-object -w "$2") &&
 959                 git update-index --add --cacheinfo 120000 $ln_s_obj "$2" &&
 960                 # pick up stat info from the file
 961                 git update-index "$2"
 962         fi
 963 }
 964
 965 # This function writes out its parameters, one per line
 966 test_write_lines () {
 967         printf "%s\n" "$@"
 968 }
 969
 970 perl () {
 971         command "$PERL_PATH" "$@" 2>&7
 972 } 7>&2 2>&4
 973
 974 # Is the value one of the various ways to spell a boolean true/false?
 975 test_normalize_bool () {
 976         git -c magic.variable="$1" config --bool magic.variable 2>/dev/null
 977 }
 978
 979 # Given a variable $1, normalize the value of it to one of "true",
 980 # "false", or "auto" and store the result to it.
 981 #
 982 #     test_tristate GIT_TEST_HTTPD
 983 #
 984 # A variable set to an empty string is set to 'false'.
 985 # A variable set to 'false' or 'auto' keeps its value.
 986 # Anything else is set to 'true'.
 987 # An unset variable defaults to 'auto'.
 988 #
 989 # The last rule is to allow people to set the variable to an empty
 990 # string and export it to decline testing the particular feature
 991 # for versions both before and after this change.  We used to treat
 992 # both unset and empty variable as a signal for "do not test" and
 993 # took any non-empty string as "please test".
 994
 995 test_tristate () {
 996         if eval "test x\"\${$1+isset}\" = xisset"
 997         then
 998                 # explicitly set
 999                 eval "
1000                         case \"\$$1\" in
1001                         '')     $1=false ;;
1002                         auto)   ;;
1003                         *)      $1=\$(test_normalize_bool \$$1 || echo true) ;;
1004                         esac
1005                 "
1006         else
1007                 eval "$1=auto"
1008         fi
1009 }
1010
1011 # Exit the test suite, either by skipping all remaining tests or by
1012 # exiting with an error. If "$1" is "auto", we then we assume we were
1013 # opportunistically trying to set up some tests and we skip. If it is
1014 # "true", then we report a failure.
1015 #
1016 # The error/skip message should be given by $2.
1017 #
1018 test_skip_or_die () {
1019         case "$1" in
1020         auto)
1021                 skip_all=$2
1022                 test_done
1023                 ;;
1024         true)
1025                 error "$2"
1026                 ;;
1027         *)
1028                 error "BUG: test tristate is '$1' (real error: $2)"
1029         esac
1030 }
1031
1032 # The following mingw_* functions obey POSIX shell syntax, but are actually
1033 # bash scripts, and are meant to be used only with bash on Windows.
1034
1035 # A test_cmp function that treats LF and CRLF equal and avoids to fork
1036 # diff when possible.
1037 mingw_test_cmp () {
1038         # Read text into shell variables and compare them. If the results
1039         # are different, use regular diff to report the difference.
1040         local test_cmp_a= test_cmp_b=
1041
1042         # When text came from stdin (one argument is '-') we must feed it
1043         # to diff.
1044         local stdin_for_diff=
1045
1046         # Since it is difficult to detect the difference between an
1047         # empty input file and a failure to read the files, we go straight
1048         # to diff if one of the inputs is empty.
1049         if test -s "$1" && test -s "$2"
1050         then
1051                 # regular case: both files non-empty
1052                 mingw_read_file_strip_cr_ test_cmp_a <"$1"
1053                 mingw_read_file_strip_cr_ test_cmp_b <"$2"
1054         elif test -s "$1" && test "$2" = -
1055         then
1056                 # read 2nd file from stdin
1057                 mingw_read_file_strip_cr_ test_cmp_a <"$1"
1058                 mingw_read_file_strip_cr_ test_cmp_b
1059                 stdin_for_diff='<<<"$test_cmp_b"'
1060         elif test "$1" = - && test -s "$2"
1061         then
1062                 # read 1st file from stdin
1063                 mingw_read_file_strip_cr_ test_cmp_a
1064                 mingw_read_file_strip_cr_ test_cmp_b <"$2"
1065                 stdin_for_diff='<<<"$test_cmp_a"'
1066         fi
1067         test -n "$test_cmp_a" &&
1068         test -n "$test_cmp_b" &&
1069         test "$test_cmp_a" = "$test_cmp_b" ||
1070         eval "diff -u \"\$@\" $stdin_for_diff"
1071 }
1072
1073 # $1 is the name of the shell variable to fill in
1074 mingw_read_file_strip_cr_ () {
1075         # Read line-wise using LF as the line separator
1076         # and use IFS to strip CR.
1077         local line
1078         while :
1079         do
1080                 if IFS=$'\r' read -r -d $'\n' line
1081                 then
1082                         # good
1083                         line=$line$'\n'
1084                 else
1085                         # we get here at EOF, but also if the last line
1086                         # was not terminated by LF; in the latter case,
1087                         # some text was read
1088                         if test -z "$line"
1089                         then
1090                                 # EOF, really
1091                                 break
1092                         fi
1093                 fi
1094                 eval "$1=\$$1\$line"
1095         done
1096 }
1097
1098 # Like "env FOO=BAR some-program", but run inside a subshell, which means
1099 # it also works for shell functions (though those functions cannot impact
1100 # the environment outside of the test_env invocation).
1101 test_env () {
1102         (
1103                 while test $# -gt 0
1104                 do
1105                         case "$1" in
1106                         *=*)
1107                                 eval "${1%%=*}=\${1#*=}"
1108                                 eval "export ${1%%=*}"
1109                                 shift
1110                                 ;;
1111                         *)
1112                                 "$@" 2>&7
1113                                 exit
1114                                 ;;
1115                         esac
1116                 done
1117         )
1118 } 7>&2 2>&4
1119
1120 # Returns true if the numeric exit code in "$2" represents the expected signal
1121 # in "$1". Signals should be given numerically.
1122 test_match_signal () {
1123         if test "$2" = "$((128 + $1))"
1124         then
1125                 # POSIX
1126                 return 0
1127         elif test "$2" = "$((256 + $1))"
1128         then
1129                 # ksh
1130                 return 0
1131         fi
1132         return 1
1133 }
1134
1135 # Read up to "$1" bytes (or to EOF) from stdin and write them to stdout.
1136 test_copy_bytes () {
1137         perl -e '
1138                 my $len = $ARGV[1];
1139                 while ($len > 0) {
1140                         my $s;
1141                         my $nread = sysread(STDIN, $s, $len);
1142                         die "cannot read: $!" unless defined($nread);
1143                         last unless $nread;
1144                         print $s;
1145                         $len -= $nread;
1146                 }
1147         ' - "$1"
1148 }
1149
1150 # run "$@" inside a non-git directory
1151 nongit () {
1152         test -d non-repo ||
1153         mkdir non-repo ||
1154         return 1
1155
1156         (
1157                 GIT_CEILING_DIRECTORIES=$(pwd) &&
1158                 export GIT_CEILING_DIRECTORIES &&
1159                 cd non-repo &&
1160                 "$@" 2>&7
1161         )
1162 } 7>&2 2>&4
1163
1164 # convert stdin to pktline representation; note that empty input becomes an
1165 # empty packet, not a flush packet (for that you can just print 0000 yourself).
1166 packetize() {
1167         cat >packetize.tmp &&
1168         len=$(wc -c <packetize.tmp) &&
1169         printf '%04x%s' "$(($len + 4))" &&
1170         cat packetize.tmp &&
1171         rm -f packetize.tmp
1172 }
1173
1174 # Parse the input as a series of pktlines, writing the result to stdout.
1175 # Sideband markers are removed automatically, and the output is routed to
1176 # stderr if appropriate.
1177 #
1178 # NUL bytes are converted to "\\0" for ease of parsing with text tools.
1179 depacketize () {
1180         perl -e '
1181                 while (read(STDIN, $len, 4) == 4) {
1182                         if ($len eq "0000") {
1183                                 print "FLUSH\n";
1184                         } else {
1185                                 read(STDIN, $buf, hex($len) - 4);
1186                                 $buf =~ s/\0/\\0/g;
1187                                 if ($buf =~ s/^[\x2\x3]//) {
1188                                         print STDERR $buf;
1189                                 } else {
1190                                         $buf =~ s/^\x1//;
1191                                         print $buf;
1192                                 }
1193                         }
1194                 }
1195         '
1196 }
1197
1198 # Set the hash algorithm in use to $1.  Only useful when testing the testsuite.
1199 test_set_hash () {
1200         test_hash_algo="$1"
1201 }
1202
1203 # Detect the hash algorithm in use.
1204 test_detect_hash () {
1205         # Currently we only support SHA-1, but in the future this function will
1206         # actually detect the algorithm in use.
1207         test_hash_algo='sha1'
1208 }
1209
1210 # Load common hash metadata and common placeholder object IDs for use with
1211 # test_oid.
1212 test_oid_init () {
1213         test -n "$test_hash_algo" || test_detect_hash &&
1214         test_oid_cache <"$TEST_DIRECTORY/oid-info/hash-info" &&
1215         test_oid_cache <"$TEST_DIRECTORY/oid-info/oid"
1216 }
1217
1218 # Load key-value pairs from stdin suitable for use with test_oid.  Blank lines
1219 # and lines starting with "#" are ignored.  Keys must be shell identifier
1220 # characters.
1221 #
1222 # Examples:
1223 # rawsz sha1:20
1224 # rawsz sha256:32
1225 test_oid_cache () {
1226         local tag rest k v &&
1227
1228         { test -n "$test_hash_algo" || test_detect_hash; } &&
1229         while read tag rest
1230         do
1231                 case $tag in
1232                 \#*)
1233                         continue;;
1234                 ?*)
1235                         # non-empty
1236                         ;;
1237                 *)
1238                         # blank line
1239                         continue;;
1240                 esac &&
1241
1242                 k="${rest%:*}" &&
1243                 v="${rest#*:}" &&
1244
1245                 if ! expr "$k" : '[a-z0-9][a-z0-9]*$' >/dev/null
1246                 then
1247                         BUG 'bad hash algorithm'
1248                 fi &&
1249                 eval "test_oid_${k}_$tag=\"\$v\""
1250         done
1251 }
1252
1253 # Look up a per-hash value based on a key ($1).  The value must have been loaded
1254 # by test_oid_init or test_oid_cache.
1255 test_oid () {
1256         local var="test_oid_${test_hash_algo}_$1" &&
1257
1258         # If the variable is unset, we must be missing an entry for this
1259         # key-hash pair, so exit with an error.
1260         if eval "test -z \"\${$var+set}\""
1261         then
1262                 BUG "undefined key '$1'"
1263         fi &&
1264         eval "printf '%s' \"\${$var}\""
1265 }