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