1# Library of functions shared by all tests scripts, included by 2# test-lib.sh. 3# 4# Copyright (c) 2005 Junio C Hamano 5# 6# This program is free software: you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation, either version 2 of the License, or 9# (at your option) any later version. 10# 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15# 16# You should have received a copy of the GNU General Public License 17# along with this program. If not, see http://www.gnu.org/licenses/ . 18 19# The semantics of the editor variables are that of invoking 20# sh -c "$EDITOR \"$@\"" files ... 21# 22# If our trash directory contains shell metacharacters, they will be 23# interpreted if we just set $EDITOR directly, so do a little dance with 24# environment variables to work around this. 25# 26# In particular, quoting isn't enough, as the path may contain the same quote 27# that we're using. 28test_set_editor () { 29 FAKE_EDITOR="$1" 30 export FAKE_EDITOR 31 EDITOR='"$FAKE_EDITOR"' 32 export EDITOR 33} 34 35test_set_index_version () { 36 GIT_INDEX_VERSION="$1" 37 export GIT_INDEX_VERSION 38} 39 40test_decode_color () { 41 awk ' 42 function name(n) { 43 if (n == 0) return "RESET"; 44 if (n == 1) return "BOLD"; 45 if (n == 30) return "BLACK"; 46 if (n == 31) return "RED"; 47 if (n == 32) return "GREEN"; 48 if (n == 33) return "YELLOW"; 49 if (n == 34) return "BLUE"; 50 if (n == 35) return "MAGENTA"; 51 if (n == 36) return "CYAN"; 52 if (n == 37) return "WHITE"; 53 if (n == 40) return "BLACK"; 54 if (n == 41) return "BRED"; 55 if (n == 42) return "BGREEN"; 56 if (n == 43) return "BYELLOW"; 57 if (n == 44) return "BBLUE"; 58 if (n == 45) return "BMAGENTA"; 59 if (n == 46) return "BCYAN"; 60 if (n == 47) return "BWHITE"; 61 } 62 { 63 while (match($0, /\033\[[0-9;]*m/) != 0) { 64 printf "%s<", substr($0, 1, RSTART-1); 65 codes = substr($0, RSTART+2, RLENGTH-3); 66 if (length(codes) == 0) 67 printf "%s", name(0) 68 else { 69 n = split(codes, ary, ";"); 70 sep = ""; 71 for (i = 1; i <= n; i++) { 72 printf "%s%s", sep, name(ary[i]); 73 sep = ";" 74 } 75 } 76 printf ">"; 77 $0 = substr($0, RSTART + RLENGTH, length($0) - RSTART - RLENGTH + 1); 78 } 79 print 80 } 81 ' 82} 83 84nul_to_q () { 85 perl -pe 'y/\000/Q/' 86} 87 88q_to_nul () { 89 perl -pe 'y/Q/\000/' 90} 91 92q_to_cr () { 93 tr Q '\015' 94} 95 96q_to_tab () { 97 tr Q '\011' 98} 99 100qz_to_tab_space () { 101 tr QZ '\011\040' 102} 103 104append_cr () { 105 sed -e 's/$/Q/' | tr Q '\015' 106} 107 108remove_cr () { 109 tr '\015' Q | sed -e 's/Q$//' 110} 111 112# In some bourne shell implementations, the "unset" builtin returns 113# nonzero status when a variable to be unset was not set in the first 114# place. 115# 116# Use sane_unset when that should not be considered an error. 117 118sane_unset () { 119 unset "$@" 120 return 0 121} 122 123test_tick () { 124 if test -z "${test_tick+set}" 125 then 126 test_tick=1112911993 127 else 128 test_tick=$(($test_tick + 60)) 129 fi 130 GIT_COMMITTER_DATE="$test_tick -0700" 131 GIT_AUTHOR_DATE="$test_tick -0700" 132 export GIT_COMMITTER_DATE GIT_AUTHOR_DATE 133} 134 135# Stop execution and start a shell. This is useful for debugging tests and 136# only makes sense together with "-v". 137# 138# Be sure to remove all invocations of this command before submitting. 139 140test_pause () { 141 if test "$verbose" = t; then 142 "$SHELL_PATH" <&6 >&3 2>&4 143 else 144 error >&5 "test_pause requires --verbose" 145 fi 146} 147 148# Call test_commit with the arguments "<message> [<file> [<contents> [<tag>]]]" 149# 150# This will commit a file with the given contents and the given commit 151# message, and tag the resulting commit with the given tag name. 152# 153# <file>, <contents>, and <tag> all default to <message>. 154 155test_commit () { 156 notick= && 157 signoff= && 158 while test $# != 0 159 do 160 case "$1" in 161 --notick) 162 notick=yes 163 ;; 164 --signoff) 165 signoff="$1" 166 ;; 167 *) 168 break 169 ;; 170 esac 171 shift 172 done && 173 file=${2:-"$1.t"} && 174 echo "${3-$1}" > "$file" && 175 git add "$file" && 176 if test -z "$notick" 177 then 178 test_tick 179 fi && 180 git commit $signoff -m "$1" && 181 git tag "${4:-$1}" 182} 183 184# Call test_merge with the arguments "<message> <commit>", where <commit> 185# can be a tag pointing to the commit-to-merge. 186 187test_merge () { 188 test_tick && 189 git merge -m "$1" "$2" && 190 git tag "$1" 191} 192 193# This function helps systems where core.filemode=false is set. 194# Use it instead of plain 'chmod +x' to set or unset the executable bit 195# of a file in the working directory and add it to the index. 196 197test_chmod () { 198 chmod "$@" && 199 git update-index --add "--chmod=$@" 200} 201 202# Unset a configuration variable, but don't fail if it doesn't exist. 203test_unconfig () { 204 config_dir= 205 if test "$1" = -C 206 then 207 shift 208 config_dir=$1 209 shift 210 fi 211 git ${config_dir:+-C "$config_dir"} config --unset-all "$@" 212 config_status=$? 213 case "$config_status" in 214 5) # ok, nothing to unset 215 config_status=0 216 ;; 217 esac 218 return $config_status 219} 220 221# Set git config, automatically unsetting it after the test is over. 222test_config () { 223 config_dir= 224 if test "$1" = -C 225 then 226 shift 227 config_dir=$1 228 shift 229 fi 230 test_when_finished "test_unconfig ${config_dir:+-C '$config_dir'} '$1'" && 231 git ${config_dir:+-C "$config_dir"} config "$@" 232} 233 234test_config_global () { 235 test_when_finished "test_unconfig --global '$1'" && 236 git config --global "$@" 237} 238 239write_script () { 240 { 241 echo "#!${2-"$SHELL_PATH"}" && 242 cat 243 } >"$1" && 244 chmod +x "$1" 245} 246 247# Use test_set_prereq to tell that a particular prerequisite is available. 248# The prerequisite can later be checked for in two ways: 249# 250# - Explicitly using test_have_prereq. 251# 252# - Implicitly by specifying the prerequisite tag in the calls to 253# test_expect_{success,failure,code}. 254# 255# The single parameter is the prerequisite tag (a simple word, in all 256# capital letters by convention). 257 258test_set_prereq () { 259 satisfied_prereq="$satisfied_prereq$1 " 260} 261satisfied_prereq=" " 262lazily_testable_prereq= lazily_tested_prereq= 263 264# Usage: test_lazy_prereq PREREQ 'script' 265test_lazy_prereq () { 266 lazily_testable_prereq="$lazily_testable_prereq$1 " 267 eval test_prereq_lazily_$1=\$2 268} 269 270test_run_lazy_prereq_ () { 271 script=' 272mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" && 273( 274 cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"' 275)' 276 say >&3 "checking prerequisite: $1" 277 say >&3 "$script" 278 test_eval_ "$script" 279 eval_ret=$? 280 rm -rf "$TRASH_DIRECTORY/prereq-test-dir" 281 if test "$eval_ret" = 0; then 282 say >&3 "prerequisite $1 ok" 283 else 284 say >&3 "prerequisite $1 not satisfied" 285 fi 286 return $eval_ret 287} 288 289test_have_prereq () { 290 # prerequisites can be concatenated with ',' 291 save_IFS=$IFS 292 IFS=, 293 set -- $* 294 IFS=$save_IFS 295 296 total_prereq=0 297 ok_prereq=0 298 missing_prereq= 299 300 for prerequisite 301 do 302 case "$prerequisite" in 303 !*) 304 negative_prereq=t 305 prerequisite=${prerequisite#!} 306 ;; 307 *) 308 negative_prereq= 309 esac 310 311 case " $lazily_tested_prereq " in 312 *" $prerequisite "*) 313 ;; 314 *) 315 case " $lazily_testable_prereq " in 316 *" $prerequisite "*) 317 eval "script=\$test_prereq_lazily_$prerequisite" && 318 if test_run_lazy_prereq_ "$prerequisite" "$script" 319 then 320 test_set_prereq $prerequisite 321 fi 322 lazily_tested_prereq="$lazily_tested_prereq$prerequisite " 323 esac 324 ;; 325 esac 326 327 total_prereq=$(($total_prereq + 1)) 328 case "$satisfied_prereq" in 329 *" $prerequisite "*) 330 satisfied_this_prereq=t 331 ;; 332 *) 333 satisfied_this_prereq= 334 esac 335 336 case "$satisfied_this_prereq,$negative_prereq" in 337 t,|,t) 338 ok_prereq=$(($ok_prereq + 1)) 339 ;; 340 *) 341 # Keep a list of missing prerequisites; restore 342 # the negative marker if necessary. 343 prerequisite=${negative_prereq:+!}$prerequisite 344 if test -z "$missing_prereq" 345 then 346 missing_prereq=$prerequisite 347 else 348 missing_prereq="$prerequisite,$missing_prereq" 349 fi 350 esac 351 done 352 353 test $total_prereq = $ok_prereq 354} 355 356test_declared_prereq () { 357 case ",$test_prereq," in 358 *,$1,*) 359 return 0 360 ;; 361 esac 362 return 1 363} 364 365test_verify_prereq () { 366 test -z "$test_prereq" || 367 expr >/dev/null "$test_prereq" : '[A-Z0-9_,!]*$' || 368 error "bug in the test script: '$test_prereq' does not look like a prereq" 369} 370 371test_expect_failure () { 372 test_start_ 373 test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq= 374 test "$#" = 2 || 375 error "bug in the test script: not 2 or 3 parameters to test-expect-failure" 376 test_verify_prereq 377 export test_prereq 378 if ! test_skip "$@" 379 then 380 say >&3 "checking known breakage: $2" 381 if test_run_ "$2" expecting_failure 382 then 383 test_known_broken_ok_ "$1" 384 else 385 test_known_broken_failure_ "$1" 386 fi 387 fi 388 test_finish_ 389} 390 391test_expect_success () { 392 test_start_ 393 test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq= 394 test "$#" = 2 || 395 error "bug in the test script: not 2 or 3 parameters to test-expect-success" 396 test_verify_prereq 397 export test_prereq 398 if ! test_skip "$@" 399 then 400 say >&3 "expecting success: $2" 401 if test_run_ "$2" 402 then 403 test_ok_ "$1" 404 else 405 test_failure_ "$@" 406 fi 407 fi 408 test_finish_ 409} 410 411# test_external runs external test scripts that provide continuous 412# test output about their progress, and succeeds/fails on 413# zero/non-zero exit code. It outputs the test output on stdout even 414# in non-verbose mode, and announces the external script with "# run 415# <n>: ..." before running it. When providing relative paths, keep in 416# mind that all scripts run in "trash directory". 417# Usage: test_external description command arguments... 418# Example: test_external 'Perl API' perl ../path/to/test.pl 419test_external () { 420 test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq= 421 test "$#" = 3 || 422 error >&5 "bug in the test script: not 3 or 4 parameters to test_external" 423 descr="$1" 424 shift 425 test_verify_prereq 426 export test_prereq 427 if ! test_skip "$descr" "$@" 428 then 429 # Announce the script to reduce confusion about the 430 # test output that follows. 431 say_color "" "# run $test_count: $descr ($*)" 432 # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG 433 # to be able to use them in script 434 export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG 435 # Run command; redirect its stderr to &4 as in 436 # test_run_, but keep its stdout on our stdout even in 437 # non-verbose mode. 438 "$@" 2>&4 439 if test "$?" = 0 440 then 441 if test $test_external_has_tap -eq 0; then 442 test_ok_ "$descr" 443 else 444 say_color "" "# test_external test $descr was ok" 445 test_success=$(($test_success + 1)) 446 fi 447 else 448 if test $test_external_has_tap -eq 0; then 449 test_failure_ "$descr" "$@" 450 else 451 say_color error "# test_external test $descr failed: $@" 452 test_failure=$(($test_failure + 1)) 453 fi 454 fi 455 fi 456} 457 458# Like test_external, but in addition tests that the command generated 459# no output on stderr. 460test_external_without_stderr () { 461 # The temporary file has no (and must have no) security 462 # implications. 463 tmp=${TMPDIR:-/tmp} 464 stderr="$tmp/git-external-stderr.$$.tmp" 465 test_external "$@" 4> "$stderr" 466 test -f "$stderr" || error "Internal error: $stderr disappeared." 467 descr="no stderr: $1" 468 shift 469 say >&3 "# expecting no stderr from previous command" 470 if test ! -s "$stderr" 471 then 472 rm "$stderr" 473 474 if test $test_external_has_tap -eq 0; then 475 test_ok_ "$descr" 476 else 477 say_color "" "# test_external_without_stderr test $descr was ok" 478 test_success=$(($test_success + 1)) 479 fi 480 else 481 if test "$verbose" = t 482 then 483 output=$(echo; echo "# Stderr is:"; cat "$stderr") 484 else 485 output= 486 fi 487 # rm first in case test_failure exits. 488 rm "$stderr" 489 if test $test_external_has_tap -eq 0; then 490 test_failure_ "$descr" "$@" "$output" 491 else 492 say_color error "# test_external_without_stderr test $descr failed: $@: $output" 493 test_failure=$(($test_failure + 1)) 494 fi 495 fi 496} 497 498# debugging-friendly alternatives to "test [-f|-d|-e]" 499# The commands test the existence or non-existence of $1. $2 can be 500# given to provide a more precise diagnosis. 501test_path_is_file () { 502 if ! test -f "$1" 503 then 504 echo "File $1 doesn't exist. $2" 505 false 506 fi 507} 508 509test_path_is_dir () { 510 if ! test -d "$1" 511 then 512 echo "Directory $1 doesn't exist. $2" 513 false 514 fi 515} 516 517# Check if the directory exists and is empty as expected, barf otherwise. 518test_dir_is_empty () { 519 test_path_is_dir "$1" && 520 if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')" 521 then 522 echo "Directory '$1' is not empty, it contains:" 523 ls -la "$1" 524 return 1 525 fi 526} 527 528test_path_is_missing () { 529 if test -e "$1" 530 then 531 echo "Path exists:" 532 ls -ld "$1" 533 if test $# -ge 1 534 then 535 echo "$*" 536 fi 537 false 538 fi 539} 540 541# test_line_count checks that a file has the number of lines it 542# ought to. For example: 543# 544# test_expect_success 'produce exactly one line of output' ' 545# do something >output && 546# test_line_count = 1 output 547# ' 548# 549# is like "test $(wc -l <output) = 1" except that it passes the 550# output through when the number of lines is wrong. 551 552test_line_count () { 553 if test $# != 3 554 then 555 error "bug in the test script: not 3 parameters to test_line_count" 556 elif ! test $(wc -l <"$3") "$1" "$2" 557 then 558 echo "test_line_count: line count for $3 !$1 $2" 559 cat "$3" 560 return 1 561 fi 562} 563 564# This is not among top-level (test_expect_success | test_expect_failure) 565# but is a prefix that can be used in the test script, like: 566# 567# test_expect_success 'complain and die' ' 568# do something && 569# do something else && 570# test_must_fail git checkout ../outerspace 571# ' 572# 573# Writing this as "! git checkout ../outerspace" is wrong, because 574# the failure could be due to a segv. We want a controlled failure. 575 576test_must_fail () { 577 "$@" 578 exit_code=$? 579 if test $exit_code = 0; then 580 echo >&2 "test_must_fail: command succeeded: $*" 581 return 1 582 elif test $exit_code -gt 129 && test $exit_code -le 192; then 583 echo >&2 "test_must_fail: died by signal: $*" 584 return 1 585 elif test $exit_code = 127; then 586 echo >&2 "test_must_fail: command not found: $*" 587 return 1 588 elif test $exit_code = 126; then 589 echo >&2 "test_must_fail: valgrind error: $*" 590 return 1 591 fi 592 return 0 593} 594 595# Similar to test_must_fail, but tolerates success, too. This is 596# meant to be used in contexts like: 597# 598# test_expect_success 'some command works without configuration' ' 599# test_might_fail git config --unset all.configuration && 600# do something 601# ' 602# 603# Writing "git config --unset all.configuration || :" would be wrong, 604# because we want to notice if it fails due to segv. 605 606test_might_fail () { 607 "$@" 608 exit_code=$? 609 if test $exit_code -gt 129 && test $exit_code -le 192; then 610 echo >&2 "test_might_fail: died by signal: $*" 611 return 1 612 elif test $exit_code = 127; then 613 echo >&2 "test_might_fail: command not found: $*" 614 return 1 615 fi 616 return 0 617} 618 619# Similar to test_must_fail and test_might_fail, but check that a 620# given command exited with a given exit code. Meant to be used as: 621# 622# test_expect_success 'Merge with d/f conflicts' ' 623# test_expect_code 1 git merge "merge msg" B master 624# ' 625 626test_expect_code () { 627 want_code=$1 628 shift 629 "$@" 630 exit_code=$? 631 if test $exit_code = $want_code 632 then 633 return 0 634 fi 635 636 echo >&2 "test_expect_code: command exited with $exit_code, we wanted $want_code $*" 637 return 1 638} 639 640# test_cmp is a helper function to compare actual and expected output. 641# You can use it like: 642# 643# test_expect_success 'foo works' ' 644# echo expected >expected && 645# foo >actual && 646# test_cmp expected actual 647# ' 648# 649# This could be written as either "cmp" or "diff -u", but: 650# - cmp's output is not nearly as easy to read as diff -u 651# - not all diff versions understand "-u" 652 653test_cmp() { 654 $GIT_TEST_CMP "$@" 655} 656 657# test_cmp_bin - helper to compare binary files 658 659test_cmp_bin() { 660 cmp "$@" 661} 662 663# Call any command "$@" but be more verbose about its 664# failure. This is handy for commands like "test" which do 665# not output anything when they fail. 666verbose () { 667 "$@" && return 0 668 echo >&2 "command failed: $(git rev-parse --sq-quote "$@")" 669 return 1 670} 671 672# Check if the file expected to be empty is indeed empty, and barfs 673# otherwise. 674 675test_must_be_empty () { 676 if test -s "$1" 677 then 678 echo "'$1' is not empty, it contains:" 679 cat "$1" 680 return 1 681 fi 682} 683 684# Tests that its two parameters refer to the same revision 685test_cmp_rev () { 686 git rev-parse --verify "$1" >expect.rev && 687 git rev-parse --verify "$2" >actual.rev && 688 test_cmp expect.rev actual.rev 689} 690 691# Print a sequence of numbers or letters in increasing order. This is 692# similar to GNU seq(1), but the latter might not be available 693# everywhere (and does not do letters). It may be used like: 694# 695# for i in $(test_seq 100) 696# do 697# for j in $(test_seq 10 20) 698# do 699# for k in $(test_seq a z) 700# do 701# echo $i-$j-$k 702# done 703# done 704# done 705 706test_seq () { 707 case $# in 708 1) set 1 "$@" ;; 709 2) ;; 710 *) error "bug in the test script: not 1 or 2 parameters to test_seq" ;; 711 esac 712 perl -le 'print for $ARGV[0]..$ARGV[1]' -- "$@" 713} 714 715# This function can be used to schedule some commands to be run 716# unconditionally at the end of the test to restore sanity: 717# 718# test_expect_success 'test core.capslock' ' 719# git config core.capslock true && 720# test_when_finished "git config --unset core.capslock" && 721# hello world 722# ' 723# 724# That would be roughly equivalent to 725# 726# test_expect_success 'test core.capslock' ' 727# git config core.capslock true && 728# hello world 729# git config --unset core.capslock 730# ' 731# 732# except that the greeting and config --unset must both succeed for 733# the test to pass. 734# 735# Note that under --immediate mode, no clean-up is done to help diagnose 736# what went wrong. 737 738test_when_finished () { 739 test_cleanup="{ $* 740 } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup" 741} 742 743# Most tests can use the created repository, but some may need to create more. 744# Usage: test_create_repo <directory> 745test_create_repo () { 746 test "$#" = 1 || 747 error "bug in the test script: not 1 parameter to test-create-repo" 748 repo="$1" 749 mkdir -p "$repo" 750 ( 751 cd "$repo" || error "Cannot setup test environment" 752 "$GIT_EXEC_PATH/git-init" "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 || 753 error "cannot run git init -- have you built things yet?" 754 mv .git/hooks .git/hooks-disabled 755 ) || exit 756} 757 758# This function helps on symlink challenged file systems when it is not 759# important that the file system entry is a symbolic link. 760# Use test_ln_s_add instead of "ln -s x y && git add y" to add a 761# symbolic link entry y to the index. 762 763test_ln_s_add () { 764 if test_have_prereq SYMLINKS 765 then 766 ln -s "$1" "$2" && 767 git update-index --add "$2" 768 else 769 printf '%s' "$1" >"$2" && 770 ln_s_obj=$(git hash-object -w "$2") && 771 git update-index --add --cacheinfo 120000 $ln_s_obj "$2" && 772 # pick up stat info from the file 773 git update-index "$2" 774 fi 775} 776 777# This function writes out its parameters, one per line 778test_write_lines () { 779 printf "%s\n" "$@" 780} 781 782perl () { 783 command "$PERL_PATH" "$@" 784} 785 786# Is the value one of the various ways to spell a boolean true/false? 787test_normalize_bool () { 788 git -c magic.variable="$1" config --bool magic.variable 2>/dev/null 789} 790 791# Given a variable $1, normalize the value of it to one of "true", 792# "false", or "auto" and store the result to it. 793# 794# test_tristate GIT_TEST_HTTPD 795# 796# A variable set to an empty string is set to 'false'. 797# A variable set to 'false' or 'auto' keeps its value. 798# Anything else is set to 'true'. 799# An unset variable defaults to 'auto'. 800# 801# The last rule is to allow people to set the variable to an empty 802# string and export it to decline testing the particular feature 803# for versions both before and after this change. We used to treat 804# both unset and empty variable as a signal for "do not test" and 805# took any non-empty string as "please test". 806 807test_tristate () { 808 if eval "test x\"\${$1+isset}\" = xisset" 809 then 810 # explicitly set 811 eval " 812 case \"\$$1\" in 813 '') $1=false ;; 814 auto) ;; 815 *) $1=\$(test_normalize_bool \$$1 || echo true) ;; 816 esac 817 " 818 else 819 eval "$1=auto" 820 fi 821} 822 823# Exit the test suite, either by skipping all remaining tests or by 824# exiting with an error. If "$1" is "auto", we then we assume we were 825# opportunistically trying to set up some tests and we skip. If it is 826# "true", then we report a failure. 827# 828# The error/skip message should be given by $2. 829# 830test_skip_or_die () { 831 case "$1" in 832 auto) 833 skip_all=$2 834 test_done 835 ;; 836 true) 837 error "$2" 838 ;; 839 *) 840 error "BUG: test tristate is '$1' (real error: $2)" 841 esac 842} 843 844# The following mingw_* functions obey POSIX shell syntax, but are actually 845# bash scripts, and are meant to be used only with bash on Windows. 846 847# A test_cmp function that treats LF and CRLF equal and avoids to fork 848# diff when possible. 849mingw_test_cmp () { 850 # Read text into shell variables and compare them. If the results 851 # are different, use regular diff to report the difference. 852 local test_cmp_a= test_cmp_b= 853 854 # When text came from stdin (one argument is '-') we must feed it 855 # to diff. 856 local stdin_for_diff= 857 858 # Since it is difficult to detect the difference between an 859 # empty input file and a failure to read the files, we go straight 860 # to diff if one of the inputs is empty. 861 if test -s "$1" && test -s "$2" 862 then 863 # regular case: both files non-empty 864 mingw_read_file_strip_cr_ test_cmp_a <"$1" 865 mingw_read_file_strip_cr_ test_cmp_b <"$2" 866 elif test -s "$1" && test "$2" = - 867 then 868 # read 2nd file from stdin 869 mingw_read_file_strip_cr_ test_cmp_a <"$1" 870 mingw_read_file_strip_cr_ test_cmp_b 871 stdin_for_diff='<<<"$test_cmp_b"' 872 elif test "$1" = - && test -s "$2" 873 then 874 # read 1st file from stdin 875 mingw_read_file_strip_cr_ test_cmp_a 876 mingw_read_file_strip_cr_ test_cmp_b <"$2" 877 stdin_for_diff='<<<"$test_cmp_a"' 878 fi 879 test -n "$test_cmp_a" && 880 test -n "$test_cmp_b" && 881 test "$test_cmp_a" = "$test_cmp_b" || 882 eval "diff -u \"\$@\" $stdin_for_diff" 883} 884 885# $1 is the name of the shell variable to fill in 886mingw_read_file_strip_cr_ () { 887 # Read line-wise using LF as the line separator 888 # and use IFS to strip CR. 889 local line 890 while : 891 do 892 if IFS=$'\r' read -r -d $'\n' line 893 then 894 # good 895 line=$line$'\n' 896 else 897 # we get here at EOF, but also if the last line 898 # was not terminated by LF; in the latter case, 899 # some text was read 900 if test -z "$line" 901 then 902 # EOF, really 903 break 904 fi 905 fi 906 eval "$1=\$$1\$line" 907 done 908}