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