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 # Generate an output of $1 bytes of all zeroes (NULs, not ASCII zeroes).
 120 # If $1 is 'infinity', output forever or until the receiving pipe stops reading,
 121 # whichever comes first.
 122 generate_zero_bytes () {
 123         test-tool genzeros "$@"
 124 }
 125
 126 # In some bourne shell implementations, the "unset" builtin returns
 127 # nonzero status when a variable to be unset was not set in the first
 128 # place.
 129 #
 130 # Use sane_unset when that should not be considered an error.
 131
 132 sane_unset () {
 133         unset "$@"
 134         return 0
 135 }
 136
 137 test_tick () {
 138         if test -z "${test_tick+set}"
 139         then
 140                 test_tick=1112911993
 141         else
 142                 test_tick=$(($test_tick + 60))
 143         fi
 144         GIT_COMMITTER_DATE="$test_tick -0700"
 145         GIT_AUTHOR_DATE="$test_tick -0700"
 146         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
 147 }
 148
 149 # Stop execution and start a shell. This is useful for debugging tests.
 150 #
 151 # Be sure to remove all invocations of this command before submitting.
 152
 153 test_pause () {
 154         "$SHELL_PATH" <&6 >&5 2>&7
 155 }
 156
 157 # Wrap git with a debugger. Adding this to a command can make it easier
 158 # to understand what is going on in a failing test.
 159 #
 160 # Examples:
 161 #     debug git checkout master
 162 #     debug --debugger=nemiver git $ARGS
 163 #     debug -d "valgrind --tool=memcheck --track-origins=yes" git $ARGS
 164 debug () {
 165         case "$1" in
 166         -d)
 167                 GIT_DEBUGGER="$2" &&
 168                 shift 2
 169                 ;;
 170         --debugger=*)
 171                 GIT_DEBUGGER="${1#*=}" &&
 172                 shift 1
 173                 ;;
 174         *)
 175                 GIT_DEBUGGER=1
 176                 ;;
 177         esac &&
 178         GIT_DEBUGGER="${GIT_DEBUGGER}" "$@" <&6 >&5 2>&7
 179 }
 180
 181 # Call test_commit with the arguments
 182 # [-C <directory>] <message> [<file> [<contents> [<tag>]]]"
 183 #
 184 # This will commit a file with the given contents and the given commit
 185 # message, and tag the resulting commit with the given tag name.
 186 #
 187 # <file>, <contents>, and <tag> all default to <message>.
 188 #
 189 # If the first argument is "-C", the second argument is used as a path for
 190 # the git invocations.
 191
 192 test_commit () {
 193         notick= &&
 194         signoff= &&
 195         indir= &&
 196         while test $# != 0
 197         do
 198                 case "$1" in
 199                 --notick)
 200                         notick=yes
 201                         ;;
 202                 --signoff)
 203                         signoff="$1"
 204                         ;;
 205                 -C)
 206                         indir="$2"
 207                         shift
 208                         ;;
 209                 *)
 210                         break
 211                         ;;
 212                 esac
 213                 shift
 214         done &&
 215         indir=${indir:+"$indir"/} &&
 216         file=${2:-"$1.t"} &&
 217         echo "${3-$1}" > "$indir$file" &&
 218         git ${indir:+ -C "$indir"} add "$file" &&
 219         if test -z "$notick"
 220         then
 221                 test_tick
 222         fi &&
 223         git ${indir:+ -C "$indir"} commit $signoff -m "$1" &&
 224         git ${indir:+ -C "$indir"} tag "${4:-$1}"
 225 }
 226
 227 # Call test_merge with the arguments "<message> <commit>", where <commit>
 228 # can be a tag pointing to the commit-to-merge.
 229
 230 test_merge () {
 231         test_tick &&
 232         git merge -m "$1" "$2" &&
 233         git tag "$1"
 234 }
 235
 236 # This function helps systems where core.filemode=false is set.
 237 # Use it instead of plain 'chmod +x' to set or unset the executable bit
 238 # of a file in the working directory and add it to the index.
 239
 240 test_chmod () {
 241         chmod "$@" &&
 242         git update-index --add "--chmod=$@"
 243 }
 244
 245 # Get the modebits from a file.
 246 test_modebits () {
 247         ls -l "$1" | sed -e 's|^\(..........\).*|\1|'
 248 }
 249
 250 # Unset a configuration variable, but don't fail if it doesn't exist.
 251 test_unconfig () {
 252         config_dir=
 253         if test "$1" = -C
 254         then
 255                 shift
 256                 config_dir=$1
 257                 shift
 258         fi
 259         git ${config_dir:+-C "$config_dir"} config --unset-all "$@"
 260         config_status=$?
 261         case "$config_status" in
 262         5) # ok, nothing to unset
 263                 config_status=0
 264                 ;;
 265         esac
 266         return $config_status
 267 }
 268
 269 # Set git config, automatically unsetting it after the test is over.
 270 test_config () {
 271         config_dir=
 272         if test "$1" = -C
 273         then
 274                 shift
 275                 config_dir=$1
 276                 shift
 277         fi
 278         test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" &&
 279         git ${config_dir:+-C "$config_dir"} config "$@"
 280 }
 281
 282 test_config_global () {
 283         test_when_finished "test_unconfig --global '$1'" &&
 284         git config --global "$@"
 285 }
 286
 287 write_script () {
 288         {
 289                 echo "#!${2-"$SHELL_PATH"}" &&
 290                 cat
 291         } >"$1" &&
 292         chmod +x "$1"
 293 }
 294
 295 # Use test_set_prereq to tell that a particular prerequisite is available.
 296 # The prerequisite can later be checked for in two ways:
 297 #
 298 # - Explicitly using test_have_prereq.
 299 #
 300 # - Implicitly by specifying the prerequisite tag in the calls to
 301 #   test_expect_{success,failure,code}.
 302 #
 303 # The single parameter is the prerequisite tag (a simple word, in all
 304 # capital letters by convention).
 305
 306 test_unset_prereq () {
 307         ! test_have_prereq "$1" ||
 308         satisfied_prereq="${satisfied_prereq% $1 *} ${satisfied_prereq#* $1 }"
 309 }
 310
 311 test_set_prereq () {
 312         case "$1" in
 313         !*)
 314                 test_unset_prereq "${1#!}"
 315                 ;;
 316         *)
 317                 satisfied_prereq="$satisfied_prereq$1 "
 318                 ;;
 319         esac
 320 }
 321 satisfied_prereq=" "
 322 lazily_testable_prereq= lazily_tested_prereq=
 323
 324 # Usage: test_lazy_prereq PREREQ 'script'
 325 test_lazy_prereq () {
 326         lazily_testable_prereq="$lazily_testable_prereq$1 "
 327         eval test_prereq_lazily_$1=\$2
 328 }
 329
 330 test_run_lazy_prereq_ () {
 331         script='
 332 mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" &&
 333 (
 334         cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"'
 335 )'
 336         say >&3 "checking prerequisite: $1"
 337         say >&3 "$script"
 338         test_eval_ "$script"
 339         eval_ret=$?
 340         rm -rf "$TRASH_DIRECTORY/prereq-test-dir"
 341         if test "$eval_ret" = 0; then
 342                 say >&3 "prerequisite $1 ok"
 343         else
 344                 say >&3 "prerequisite $1 not satisfied"
 345         fi
 346         return $eval_ret
 347 }
 348
 349 test_have_prereq () {
 350         # prerequisites can be concatenated with ','
 351         save_IFS=$IFS
 352         IFS=,
 353         set -- $*
 354         IFS=$save_IFS
 355
 356         total_prereq=0
 357         ok_prereq=0
 358         missing_prereq=
 359
 360         for prerequisite
 361         do
 362                 case "$prerequisite" in
 363                 !*)
 364                         negative_prereq=t
 365                         prerequisite=${prerequisite#!}
 366                         ;;
 367                 *)
 368                         negative_prereq=
 369                 esac
 370
 371                 case " $lazily_tested_prereq " in
 372                 *" $prerequisite "*)
 373                         ;;
 374                 *)
 375                         case " $lazily_testable_prereq " in
 376                         *" $prerequisite "*)
 377                                 eval "script=\$test_prereq_lazily_$prerequisite" &&
 378                                 if test_run_lazy_prereq_ "$prerequisite" "$script"
 379                                 then
 380                                         test_set_prereq $prerequisite
 381                                 fi
 382                                 lazily_tested_prereq="$lazily_tested_prereq$prerequisite "
 383                         esac
 384                         ;;
 385                 esac
 386
 387                 total_prereq=$(($total_prereq + 1))
 388                 case "$satisfied_prereq" in
 389                 *" $prerequisite "*)
 390                         satisfied_this_prereq=t
 391                         ;;
 392                 *)
 393                         satisfied_this_prereq=
 394                 esac
 395
 396                 case "$satisfied_this_prereq,$negative_prereq" in
 397                 t,|,t)
 398                         ok_prereq=$(($ok_prereq + 1))
 399                         ;;
 400                 *)
 401                         # Keep a list of missing prerequisites; restore
 402                         # the negative marker if necessary.
 403                         prerequisite=${negative_prereq:+!}$prerequisite
 404                         if test -z "$missing_prereq"
 405                         then
 406                                 missing_prereq=$prerequisite
 407                         else
 408                                 missing_prereq="$prerequisite,$missing_prereq"
 409                         fi
 410                 esac
 411         done
 412
 413         test $total_prereq = $ok_prereq
 414 }
 415
 416 test_declared_prereq () {
 417         case ",$test_prereq," in
 418         *,$1,*)
 419                 return 0
 420                 ;;
 421         esac
 422         return 1
 423 }
 424
 425 test_verify_prereq () {
 426         test -z "$test_prereq" ||
 427         expr >/dev/null "$test_prereq" : '[A-Z0-9_,!]*$' ||
 428         BUG "'$test_prereq' does not look like a prereq"
 429 }
 430
 431 test_expect_failure () {
 432         test_start_
 433         test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 434         test "$#" = 2 ||
 435         BUG "not 2 or 3 parameters to test-expect-failure"
 436         test_verify_prereq
 437         export test_prereq
 438         if ! test_skip "$@"
 439         then
 440                 say >&3 "checking known breakage: $2"
 441                 if test_run_ "$2" expecting_failure
 442                 then
 443                         test_known_broken_ok_ "$1"
 444                 else
 445                         test_known_broken_failure_ "$1"
 446                 fi
 447         fi
 448         test_finish_
 449 }
 450
 451 test_expect_success () {
 452         test_start_
 453         test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq=
 454         test "$#" = 2 ||
 455         BUG "not 2 or 3 parameters to test-expect-success"
 456         test_verify_prereq
 457         export test_prereq
 458         if ! test_skip "$@"
 459         then
 460                 say >&3 "expecting success: $2"
 461                 if test_run_ "$2"
 462                 then
 463                         test_ok_ "$1"
 464                 else
 465                         test_failure_ "$@"
 466                 fi
 467         fi
 468         test_finish_
 469 }
 470
 471 # test_external runs external test scripts that provide continuous
 472 # test output about their progress, and succeeds/fails on
 473 # zero/non-zero exit code.  It outputs the test output on stdout even
 474 # in non-verbose mode, and announces the external script with "# run
 475 # <n>: ..." before running it.  When providing relative paths, keep in
 476 # mind that all scripts run in "trash directory".
 477 # Usage: test_external description command arguments...
 478 # Example: test_external 'Perl API' perl ../path/to/test.pl
 479 test_external () {
 480         test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq=
 481         test "$#" = 3 ||
 482         BUG "not 3 or 4 parameters to test_external"
 483         descr="$1"
 484         shift
 485         test_verify_prereq
 486         export test_prereq
 487         if ! test_skip "$descr" "$@"
 488         then
 489                 # Announce the script to reduce confusion about the
 490                 # test output that follows.
 491                 say_color "" "# run $test_count: $descr ($*)"
 492                 # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG
 493                 # to be able to use them in script
 494                 export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG
 495                 # Run command; redirect its stderr to &4 as in
 496                 # test_run_, but keep its stdout on our stdout even in
 497                 # non-verbose mode.
 498                 "$@" 2>&4
 499                 if test "$?" = 0
 500                 then
 501                         if test $test_external_has_tap -eq 0; then
 502                                 test_ok_ "$descr"
 503                         else
 504                                 say_color "" "# test_external test $descr was ok"
 505                                 test_success=$(($test_success + 1))
 506                         fi
 507                 else
 508                         if test $test_external_has_tap -eq 0; then
 509                                 test_failure_ "$descr" "$@"
 510                         else
 511                                 say_color error "# test_external test $descr failed: $@"
 512                                 test_failure=$(($test_failure + 1))
 513                         fi
 514                 fi
 515         fi
 516 }
 517
 518 # Like test_external, but in addition tests that the command generated
 519 # no output on stderr.
 520 test_external_without_stderr () {
 521         # The temporary file has no (and must have no) security
 522         # implications.
 523         tmp=${TMPDIR:-/tmp}
 524         stderr="$tmp/git-external-stderr.$$.tmp"
 525         test_external "$@" 4> "$stderr"
 526         test -f "$stderr" || error "Internal error: $stderr disappeared."
 527         descr="no stderr: $1"
 528         shift
 529         say >&3 "# expecting no stderr from previous command"
 530         if test ! -s "$stderr"
 531         then
 532                 rm "$stderr"
 533
 534                 if test $test_external_has_tap -eq 0; then
 535                         test_ok_ "$descr"
 536                 else
 537                         say_color "" "# test_external_without_stderr test $descr was ok"
 538                         test_success=$(($test_success + 1))
 539                 fi
 540         else
 541                 if test "$verbose" = t
 542                 then
 543                         output=$(echo; echo "# Stderr is:"; cat "$stderr")
 544                 else
 545                         output=
 546                 fi
 547                 # rm first in case test_failure exits.
 548                 rm "$stderr"
 549                 if test $test_external_has_tap -eq 0; then
 550                         test_failure_ "$descr" "$@" "$output"
 551                 else
 552                         say_color error "# test_external_without_stderr test $descr failed: $@: $output"
 553                         test_failure=$(($test_failure + 1))
 554                 fi
 555         fi
 556 }
 557
 558 # debugging-friendly alternatives to "test [-f|-d|-e]"
 559 # The commands test the existence or non-existence of $1. $2 can be
 560 # given to provide a more precise diagnosis.
 561 test_path_is_file () {
 562         if ! test -f "$1"
 563         then
 564                 echo "File $1 doesn't exist. $2"
 565                 false
 566         fi
 567 }
 568
 569 test_path_is_dir () {
 570         if ! test -d "$1"
 571         then
 572                 echo "Directory $1 doesn't exist. $2"
 573                 false
 574         fi
 575 }
 576
 577 test_path_exists () {
 578         if ! test -e "$1"
 579         then
 580                 echo "Path $1 doesn't exist. $2"
 581                 false
 582         fi
 583 }
 584
 585 # Check if the directory exists and is empty as expected, barf otherwise.
 586 test_dir_is_empty () {
 587         test_path_is_dir "$1" &&
 588         if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')"
 589         then
 590                 echo "Directory '$1' is not empty, it contains:"
 591                 ls -la "$1"
 592                 return 1
 593         fi
 594 }
 595
 596 test_path_is_missing () {
 597         if test -e "$1"
 598         then
 599                 echo "Path exists:"
 600                 ls -ld "$1"
 601                 if test $# -ge 1
 602                 then
 603                         echo "$*"
 604                 fi
 605                 false
 606         fi
 607 }
 608
 609 # test_line_count checks that a file has the number of lines it
 610 # ought to. For example:
 611 #
 612 #       test_expect_success 'produce exactly one line of output' '
 613 #               do something >output &&
 614 #               test_line_count = 1 output
 615 #       '
 616 #
 617 # is like "test $(wc -l <output) = 1" except that it passes the
 618 # output through when the number of lines is wrong.
 619
 620 test_line_count () {
 621         if test $# != 3
 622         then
 623                 BUG "not 3 parameters to test_line_count"
 624         elif ! test $(wc -l <"$3") "$1" "$2"
 625         then
 626                 echo "test_line_count: line count for $3 !$1 $2"
 627                 cat "$3"
 628                 return 1
 629         fi
 630 }
 631
 632 # Returns success if a comma separated string of keywords ($1) contains a
 633 # given keyword ($2).
 634 # Examples:
 635 # `list_contains "foo,bar" bar` returns 0
 636 # `list_contains "foo" bar` returns 1
 637
 638 list_contains () {
 639         case ",$1," in
 640         *,$2,*)
 641                 return 0
 642                 ;;
 643         esac
 644         return 1
 645 }
 646
 647 # This is not among top-level (test_expect_success | test_expect_failure)
 648 # but is a prefix that can be used in the test script, like:
 649 #
 650 #       test_expect_success 'complain and die' '
 651 #           do something &&
 652 #           do something else &&
 653 #           test_must_fail git checkout ../outerspace
 654 #       '
 655 #
 656 # Writing this as "! git checkout ../outerspace" is wrong, because
 657 # the failure could be due to a segv.  We want a controlled failure.
 658 #
 659 # Accepts the following options:
 660 #
 661 #   ok=<signal-name>[,<...>]:
 662 #     Don't treat an exit caused by the given signal as error.
 663 #     Multiple signals can be specified as a comma separated list.
 664 #     Currently recognized signal names are: sigpipe, success.
 665 #     (Don't use 'success', use 'test_might_fail' instead.)
 666
 667 test_must_fail () {
 668         case "$1" in
 669         ok=*)
 670                 _test_ok=${1#ok=}
 671                 shift
 672                 ;;
 673         *)
 674                 _test_ok=
 675                 ;;
 676         esac
 677         "$@" 2>&7
 678         exit_code=$?
 679         if test $exit_code -eq 0 && ! list_contains "$_test_ok" success
 680         then
 681                 echo >&4 "test_must_fail: command succeeded: $*"
 682                 return 1
 683         elif test_match_signal 13 $exit_code && list_contains "$_test_ok" sigpipe
 684         then
 685                 return 0
 686         elif test $exit_code -gt 129 && test $exit_code -le 192
 687         then
 688                 echo >&4 "test_must_fail: died by signal $(($exit_code - 128)): $*"
 689                 return 1
 690         elif test $exit_code -eq 127
 691         then
 692                 echo >&4 "test_must_fail: command not found: $*"
 693                 return 1
 694         elif test $exit_code -eq 126
 695         then
 696                 echo >&4 "test_must_fail: valgrind error: $*"
 697                 return 1
 698         fi
 699         return 0
 700 } 7>&2 2>&4
 701
 702 # Similar to test_must_fail, but tolerates success, too.  This is
 703 # meant to be used in contexts like:
 704 #
 705 #       test_expect_success 'some command works without configuration' '
 706 #               test_might_fail git config --unset all.configuration &&
 707 #               do something
 708 #       '
 709 #
 710 # Writing "git config --unset all.configuration || :" would be wrong,
 711 # because we want to notice if it fails due to segv.
 712 #
 713 # Accepts the same options as test_must_fail.
 714
 715 test_might_fail () {
 716         test_must_fail ok=success "$@" 2>&7
 717 } 7>&2 2>&4
 718
 719 # Similar to test_must_fail and test_might_fail, but check that a
 720 # given command exited with a given exit code. Meant to be used as:
 721 #
 722 #       test_expect_success 'Merge with d/f conflicts' '
 723 #               test_expect_code 1 git merge "merge msg" B master
 724 #       '
 725
 726 test_expect_code () {
 727         want_code=$1
 728         shift
 729         "$@" 2>&7
 730         exit_code=$?
 731         if test $exit_code = $want_code
 732         then
 733                 return 0
 734         fi
 735
 736         echo >&4 "test_expect_code: command exited with $exit_code, we wanted $want_code $*"
 737         return 1
 738 } 7>&2 2>&4
 739
 740 # test_cmp is a helper function to compare actual and expected output.
 741 # You can use it like:
 742 #
 743 #       test_expect_success 'foo works' '
 744 #               echo expected >expected &&
 745 #               foo >actual &&
 746 #               test_cmp expected actual
 747 #       '
 748 #
 749 # This could be written as either "cmp" or "diff -u", but:
 750 # - cmp's output is not nearly as easy to read as diff -u
 751 # - not all diff versions understand "-u"
 752
 753 test_cmp() {
 754         $GIT_TEST_CMP "$@"
 755 }
 756
 757 # Check that the given config key has the expected value.
 758 #
 759 #    test_cmp_config [-C <dir>] <expected-value>
 760 #                    [<git-config-options>...] <config-key>
 761 #
 762 # for example to check that the value of core.bar is foo
 763 #
 764 #    test_cmp_config foo core.bar
 765 #
 766 test_cmp_config() {
 767         local GD &&
 768         if test "$1" = "-C"
 769         then
 770                 shift &&
 771                 GD="-C $1" &&
 772                 shift
 773         fi &&
 774         printf "%s\n" "$1" >expect.config &&
 775         shift &&
 776         git $GD config "$@" >actual.config &&
 777         test_cmp expect.config actual.config
 778 }
 779
 780 # test_cmp_bin - helper to compare binary files
 781
 782 test_cmp_bin() {
 783         cmp "$@"
 784 }
 785
 786 # Use this instead of test_cmp to compare files that contain expected and
 787 # actual output from git commands that can be translated.  When running
 788 # under GIT_TEST_GETTEXT_POISON this pretends that the command produced expected
 789 # results.
 790 test_i18ncmp () {
 791         ! test_have_prereq C_LOCALE_OUTPUT || test_cmp "$@"
 792 }
 793
 794 # Use this instead of "grep expected-string actual" to see if the
 795 # output from a git command that can be translated either contains an
 796 # expected string, or does not contain an unwanted one.  When running
 797 # under GIT_TEST_GETTEXT_POISON this pretends that the command produced expected
 798 # results.
 799 test_i18ngrep () {
 800         eval "last_arg=\${$#}"
 801
 802         test -f "$last_arg" ||
 803         BUG "test_i18ngrep requires a file to read as the last parameter"
 804
 805         if test $# -lt 2 ||
 806            { test "x!" = "x$1" && test $# -lt 3 ; }
 807         then
 808                 BUG "too few parameters to test_i18ngrep"
 809         fi
 810
 811         if test_have_prereq !C_LOCALE_OUTPUT
 812         then
 813                 # pretend success
 814                 return 0
 815         fi
 816
 817         if test "x!" = "x$1"
 818         then
 819                 shift
 820                 ! grep "$@" && return 0
 821
 822                 echo >&4 "error: '! grep $@' did find a match in:"
 823         else
 824                 grep "$@" && return 0
 825
 826                 echo >&4 "error: 'grep $@' didn't find a match in:"
 827         fi
 828
 829         if test -s "$last_arg"
 830         then
 831                 cat >&4 "$last_arg"
 832         else
 833                 echo >&4 "<File '$last_arg' is empty>"
 834         fi
 835
 836         return 1
 837 }
 838
 839 # Call any command "$@" but be more verbose about its
 840 # failure. This is handy for commands like "test" which do
 841 # not output anything when they fail.
 842 verbose () {
 843         "$@" && return 0
 844         echo >&4 "command failed: $(git rev-parse --sq-quote "$@")"
 845         return 1
 846 }
 847
 848 # Check if the file expected to be empty is indeed empty, and barfs
 849 # otherwise.
 850
 851 test_must_be_empty () {
 852         test_path_is_file "$1" &&
 853         if test -s "$1"
 854         then
 855                 echo "'$1' is not empty, it contains:"
 856                 cat "$1"
 857                 return 1
 858         fi
 859 }
 860
 861 # Tests that its two parameters refer to the same revision
 862 test_cmp_rev () {
 863         if test $# != 2
 864         then
 865                 error "bug in the test script: test_cmp_rev requires two revisions, but got $#"
 866         else
 867                 local r1 r2
 868                 r1=$(git rev-parse --verify "$1") &&
 869                 r2=$(git rev-parse --verify "$2") &&
 870                 if test "$r1" != "$r2"
 871                 then
 872                         cat >&4 <<-EOF
 873                         error: two revisions point to different objects:
 874                           '$1': $r1
 875                           '$2': $r2
 876                         EOF
 877                         return 1
 878                 fi
 879         fi
 880 }
 881
 882 # Print a sequence of integers in increasing order, either with
 883 # two arguments (start and end):
 884 #
 885 #     test_seq 1 5 -- outputs 1 2 3 4 5 one line at a time
 886 #
 887 # or with one argument (end), in which case it starts counting
 888 # from 1.
 889
 890 test_seq () {
 891         case $# in
 892         1)      set 1 "$@" ;;
 893         2)      ;;
 894         *)      BUG "not 1 or 2 parameters to test_seq" ;;
 895         esac
 896         test_seq_counter__=$1
 897         while test "$test_seq_counter__" -le "$2"
 898         do
 899                 echo "$test_seq_counter__"
 900                 test_seq_counter__=$(( $test_seq_counter__ + 1 ))
 901         done
 902 }
 903
 904 # This function can be used to schedule some commands to be run
 905 # unconditionally at the end of the test to restore sanity:
 906 #
 907 #       test_expect_success 'test core.capslock' '
 908 #               git config core.capslock true &&
 909 #               test_when_finished "git config --unset core.capslock" &&
 910 #               hello world
 911 #       '
 912 #
 913 # That would be roughly equivalent to
 914 #
 915 #       test_expect_success 'test core.capslock' '
 916 #               git config core.capslock true &&
 917 #               hello world
 918 #               git config --unset core.capslock
 919 #       '
 920 #
 921 # except that the greeting and config --unset must both succeed for
 922 # the test to pass.
 923 #
 924 # Note that under --immediate mode, no clean-up is done to help diagnose
 925 # what went wrong.
 926
 927 test_when_finished () {
 928         # We cannot detect when we are in a subshell in general, but by
 929         # doing so on Bash is better than nothing (the test will
 930         # silently pass on other shells).
 931         test "${BASH_SUBSHELL-0}" = 0 ||
 932         BUG "test_when_finished does nothing in a subshell"
 933         test_cleanup="{ $*
 934                 } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup"
 935 }
 936
 937 # Most tests can use the created repository, but some may need to create more.
 938 # Usage: test_create_repo <directory>
 939 test_create_repo () {
 940         test "$#" = 1 ||
 941         BUG "not 1 parameter to test-create-repo"
 942         repo="$1"
 943         mkdir -p "$repo"
 944         (
 945                 cd "$repo" || error "Cannot setup test environment"
 946                 "${GIT_TEST_INSTALLED:-$GIT_EXEC_PATH}/git$X" init \
 947                         "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 ||
 948                 error "cannot run git init -- have you built things yet?"
 949                 mv .git/hooks .git/hooks-disabled
 950         ) || exit
 951 }
 952
 953 # This function helps on symlink challenged file systems when it is not
 954 # important that the file system entry is a symbolic link.
 955 # Use test_ln_s_add instead of "ln -s x y && git add y" to add a
 956 # symbolic link entry y to the index.
 957
 958 test_ln_s_add () {
 959         if test_have_prereq SYMLINKS
 960         then
 961                 ln -s "$1" "$2" &&
 962                 git update-index --add "$2"
 963         else
 964                 printf '%s' "$1" >"$2" &&
 965                 ln_s_obj=$(git hash-object -w "$2") &&
 966                 git update-index --add --cacheinfo 120000 $ln_s_obj "$2" &&
 967                 # pick up stat info from the file
 968                 git update-index "$2"
 969         fi
 970 }
 971
 972 # This function writes out its parameters, one per line
 973 test_write_lines () {
 974         printf "%s\n" "$@"
 975 }
 976
 977 perl () {
 978         command "$PERL_PATH" "$@" 2>&7
 979 } 7>&2 2>&4
 980
 981 # Is the value one of the various ways to spell a boolean true/false?
 982 test_normalize_bool () {
 983         git -c magic.variable="$1" config --bool magic.variable 2>/dev/null
 984 }
 985
 986 # Given a variable $1, normalize the value of it to one of "true",
 987 # "false", or "auto" and store the result to it.
 988 #
 989 #     test_tristate GIT_TEST_HTTPD
 990 #
 991 # A variable set to an empty string is set to 'false'.
 992 # A variable set to 'false' or 'auto' keeps its value.
 993 # Anything else is set to 'true'.
 994 # An unset variable defaults to 'auto'.
 995 #
 996 # The last rule is to allow people to set the variable to an empty
 997 # string and export it to decline testing the particular feature
 998 # for versions both before and after this change.  We used to treat
 999 # both unset and empty variable as a signal for "do not test" and
1000 # took any non-empty string as "please test".
1001
1002 test_tristate () {
1003         if eval "test x\"\${$1+isset}\" = xisset"
1004         then
1005                 # explicitly set
1006                 eval "
1007                         case \"\$$1\" in
1008                         '')     $1=false ;;
1009                         auto)   ;;
1010                         *)      $1=\$(test_normalize_bool \$$1 || echo true) ;;
1011                         esac
1012                 "
1013         else
1014                 eval "$1=auto"
1015         fi
1016 }
1017
1018 # Exit the test suite, either by skipping all remaining tests or by
1019 # exiting with an error. If "$1" is "auto", we then we assume we were
1020 # opportunistically trying to set up some tests and we skip. If it is
1021 # "true", then we report a failure.
1022 #
1023 # The error/skip message should be given by $2.
1024 #
1025 test_skip_or_die () {
1026         case "$1" in
1027         auto)
1028                 skip_all=$2
1029                 test_done
1030                 ;;
1031         true)
1032                 error "$2"
1033                 ;;
1034         *)
1035                 error "BUG: test tristate is '$1' (real error: $2)"
1036         esac
1037 }
1038
1039 # The following mingw_* functions obey POSIX shell syntax, but are actually
1040 # bash scripts, and are meant to be used only with bash on Windows.
1041
1042 # A test_cmp function that treats LF and CRLF equal and avoids to fork
1043 # diff when possible.
1044 mingw_test_cmp () {
1045         # Read text into shell variables and compare them. If the results
1046         # are different, use regular diff to report the difference.
1047         local test_cmp_a= test_cmp_b=
1048
1049         # When text came from stdin (one argument is '-') we must feed it
1050         # to diff.
1051         local stdin_for_diff=
1052
1053         # Since it is difficult to detect the difference between an
1054         # empty input file and a failure to read the files, we go straight
1055         # to diff if one of the inputs is empty.
1056         if test -s "$1" && test -s "$2"
1057         then
1058                 # regular case: both files non-empty
1059                 mingw_read_file_strip_cr_ test_cmp_a <"$1"
1060                 mingw_read_file_strip_cr_ test_cmp_b <"$2"
1061         elif test -s "$1" && test "$2" = -
1062         then
1063                 # read 2nd file from stdin
1064                 mingw_read_file_strip_cr_ test_cmp_a <"$1"
1065                 mingw_read_file_strip_cr_ test_cmp_b
1066                 stdin_for_diff='<<<"$test_cmp_b"'
1067         elif test "$1" = - && test -s "$2"
1068         then
1069                 # read 1st file from stdin
1070                 mingw_read_file_strip_cr_ test_cmp_a
1071                 mingw_read_file_strip_cr_ test_cmp_b <"$2"
1072                 stdin_for_diff='<<<"$test_cmp_a"'
1073         fi
1074         test -n "$test_cmp_a" &&
1075         test -n "$test_cmp_b" &&
1076         test "$test_cmp_a" = "$test_cmp_b" ||
1077         eval "diff -u \"\$@\" $stdin_for_diff"
1078 }
1079
1080 # $1 is the name of the shell variable to fill in
1081 mingw_read_file_strip_cr_ () {
1082         # Read line-wise using LF as the line separator
1083         # and use IFS to strip CR.
1084         local line
1085         while :
1086         do
1087                 if IFS=$'\r' read -r -d $'\n' line
1088                 then
1089                         # good
1090                         line=$line$'\n'
1091                 else
1092                         # we get here at EOF, but also if the last line
1093                         # was not terminated by LF; in the latter case,
1094                         # some text was read
1095                         if test -z "$line"
1096                         then
1097                                 # EOF, really
1098                                 break
1099                         fi
1100                 fi
1101                 eval "$1=\$$1\$line"
1102         done
1103 }
1104
1105 # Like "env FOO=BAR some-program", but run inside a subshell, which means
1106 # it also works for shell functions (though those functions cannot impact
1107 # the environment outside of the test_env invocation).
1108 test_env () {
1109         (
1110                 while test $# -gt 0
1111                 do
1112                         case "$1" in
1113                         *=*)
1114                                 eval "${1%%=*}=\${1#*=}"
1115                                 eval "export ${1%%=*}"
1116                                 shift
1117                                 ;;
1118                         *)
1119                                 "$@" 2>&7
1120                                 exit
1121                                 ;;
1122                         esac
1123                 done
1124         )
1125 } 7>&2 2>&4
1126
1127 # Returns true if the numeric exit code in "$2" represents the expected signal
1128 # in "$1". Signals should be given numerically.
1129 test_match_signal () {
1130         if test "$2" = "$((128 + $1))"
1131         then
1132                 # POSIX
1133                 return 0
1134         elif test "$2" = "$((256 + $1))"
1135         then
1136                 # ksh
1137                 return 0
1138         fi
1139         return 1
1140 }
1141
1142 # Read up to "$1" bytes (or to EOF) from stdin and write them to stdout.
1143 test_copy_bytes () {
1144         perl -e '
1145                 my $len = $ARGV[1];
1146                 while ($len > 0) {
1147                         my $s;
1148                         my $nread = sysread(STDIN, $s, $len);
1149                         die "cannot read: $!" unless defined($nread);
1150                         last unless $nread;
1151                         print $s;
1152                         $len -= $nread;
1153                 }
1154         ' - "$1"
1155 }
1156
1157 # run "$@" inside a non-git directory
1158 nongit () {
1159         test -d non-repo ||
1160         mkdir non-repo ||
1161         return 1
1162
1163         (
1164                 GIT_CEILING_DIRECTORIES=$(pwd) &&
1165                 export GIT_CEILING_DIRECTORIES &&
1166                 cd non-repo &&
1167                 "$@" 2>&7
1168         )
1169 } 7>&2 2>&4
1170
1171 # convert stdin to pktline representation; note that empty input becomes an
1172 # empty packet, not a flush packet (for that you can just print 0000 yourself).
1173 packetize() {
1174         cat >packetize.tmp &&
1175         len=$(wc -c <packetize.tmp) &&
1176         printf '%04x%s' "$(($len + 4))" &&
1177         cat packetize.tmp &&
1178         rm -f packetize.tmp
1179 }
1180
1181 # Parse the input as a series of pktlines, writing the result to stdout.
1182 # Sideband markers are removed automatically, and the output is routed to
1183 # stderr if appropriate.
1184 #
1185 # NUL bytes are converted to "\\0" for ease of parsing with text tools.
1186 depacketize () {
1187         perl -e '
1188                 while (read(STDIN, $len, 4) == 4) {
1189                         if ($len eq "0000") {
1190                                 print "FLUSH\n";
1191                         } else {
1192                                 read(STDIN, $buf, hex($len) - 4);
1193                                 $buf =~ s/\0/\\0/g;
1194                                 if ($buf =~ s/^[\x2\x3]//) {
1195                                         print STDERR $buf;
1196                                 } else {
1197                                         $buf =~ s/^\x1//;
1198                                         print $buf;
1199                                 }
1200                         }
1201                 }
1202         '
1203 }
1204
1205 # Set the hash algorithm in use to $1.  Only useful when testing the testsuite.
1206 test_set_hash () {
1207         test_hash_algo="$1"
1208 }
1209
1210 # Detect the hash algorithm in use.
1211 test_detect_hash () {
1212         # Currently we only support SHA-1, but in the future this function will
1213         # actually detect the algorithm in use.
1214         test_hash_algo='sha1'
1215 }
1216
1217 # Load common hash metadata and common placeholder object IDs for use with
1218 # test_oid.
1219 test_oid_init () {
1220         test -n "$test_hash_algo" || test_detect_hash &&
1221         test_oid_cache <"$TEST_DIRECTORY/oid-info/hash-info" &&
1222         test_oid_cache <"$TEST_DIRECTORY/oid-info/oid"
1223 }
1224
1225 # Load key-value pairs from stdin suitable for use with test_oid.  Blank lines
1226 # and lines starting with "#" are ignored.  Keys must be shell identifier
1227 # characters.
1228 #
1229 # Examples:
1230 # rawsz sha1:20
1231 # rawsz sha256:32
1232 test_oid_cache () {
1233         local tag rest k v &&
1234
1235         { test -n "$test_hash_algo" || test_detect_hash; } &&
1236         while read tag rest
1237         do
1238                 case $tag in
1239                 \#*)
1240                         continue;;
1241                 ?*)
1242                         # non-empty
1243                         ;;
1244                 *)
1245                         # blank line
1246                         continue;;
1247                 esac &&
1248
1249                 k="${rest%:*}" &&
1250                 v="${rest#*:}" &&
1251
1252                 if ! expr "$k" : '[a-z0-9][a-z0-9]*$' >/dev/null
1253                 then
1254                         BUG 'bad hash algorithm'
1255                 fi &&
1256                 eval "test_oid_${k}_$tag=\"\$v\""
1257         done
1258 }
1259
1260 # Look up a per-hash value based on a key ($1).  The value must have been loaded
1261 # by test_oid_init or test_oid_cache.
1262 test_oid () {
1263         local var="test_oid_${test_hash_algo}_$1" &&
1264
1265         # If the variable is unset, we must be missing an entry for this
1266         # key-hash pair, so exit with an error.
1267         if eval "test -z \"\${$var+set}\""
1268         then
1269                 BUG "undefined key '$1'"
1270         fi &&
1271         eval "printf '%s' \"\${$var}\""
1272 }
1273
1274 # Choose a port number based on the test script's number and store it in
1275 # the given variable name, unless that variable already contains a number.
1276 test_set_port () {
1277         local var=$1 port
1278
1279         if test $# -ne 1 || test -z "$var"
1280         then
1281                 BUG "test_set_port requires a variable name"
1282         fi
1283
1284         eval port=\$$var
1285         case "$port" in
1286         "")
1287                 # No port is set in the given env var, use the test
1288                 # number as port number instead.
1289                 # Remove not only the leading 't', but all leading zeros
1290                 # as well, so the arithmetic below won't (mis)interpret
1291                 # a test number like '0123' as an octal value.
1292                 port=${this_test#${this_test%%[1-9]*}}
1293                 if test "${port:-0}" -lt 1024
1294                 then
1295                         # root-only port, use a larger one instead.
1296                         port=$(($port + 10000))
1297                 fi
1298                 ;;
1299         *[!0-9]*|0*)
1300                 error >&7 "invalid port number: $port"
1301                 ;;
1302         *)
1303                 # The user has specified the port.
1304                 ;;
1305         esac
1306
1307         # Make sure that parallel '--stress' test jobs get different
1308         # ports.
1309         port=$(($port + ${GIT_TEST_STRESS_JOB_NR:-0}))
1310         eval $var=$port
1311 }