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=$@" 200} 201 202# Unset a configuration variable, but don't fail if it doesn't exist. 203test_unconfig () { 204 git config --unset-all "$@" 205 config_status=$? 206 case "$config_status" in 207 5) # ok, nothing to unset 208 config_status=0 209 ;; 210 esac 211 return $config_status 212} 213 214# Set git config, automatically unsetting it after the test is over. 215test_config () { 216 test_when_finished "test_unconfig '$1'" && 217 git config "$@" 218} 219 220test_config_global () { 221 test_when_finished "test_unconfig --global '$1'" && 222 git config --global "$@" 223} 224 225write_script () { 226 { 227 echo "#!${2-"$SHELL_PATH"}" && 228 cat 229 } >"$1" && 230 chmod +x "$1" 231} 232 233# Use test_set_prereq to tell that a particular prerequisite is available. 234# The prerequisite can later be checked for in two ways: 235# 236# - Explicitly using test_have_prereq. 237# 238# - Implicitly by specifying the prerequisite tag in the calls to 239# test_expect_{success,failure,code}. 240# 241# The single parameter is the prerequisite tag (a simple word, in all 242# capital letters by convention). 243 244test_set_prereq () { 245 satisfied_prereq="$satisfied_prereq$1 " 246} 247satisfied_prereq=" " 248lazily_testable_prereq= lazily_tested_prereq= 249 250# Usage: test_lazy_prereq PREREQ 'script' 251test_lazy_prereq () { 252 lazily_testable_prereq="$lazily_testable_prereq$1 " 253 eval test_prereq_lazily_$1=\$2 254} 255 256test_run_lazy_prereq_ () { 257 script=' 258mkdir -p "$TRASH_DIRECTORY/prereq-test-dir" && 259( 260 cd "$TRASH_DIRECTORY/prereq-test-dir" &&'"$2"' 261)' 262 say >&3 "checking prerequisite: $1" 263 say >&3 "$script" 264 test_eval_ "$script" 265 eval_ret=$? 266 rm -rf "$TRASH_DIRECTORY/prereq-test-dir" 267 if test "$eval_ret" = 0; then 268 say >&3 "prerequisite $1 ok" 269 else 270 say >&3 "prerequisite $1 not satisfied" 271 fi 272 return $eval_ret 273} 274 275test_have_prereq () { 276 # prerequisites can be concatenated with ',' 277 save_IFS=$IFS 278 IFS=, 279 set -- $* 280 IFS=$save_IFS 281 282 total_prereq=0 283 ok_prereq=0 284 missing_prereq= 285 286 for prerequisite 287 do 288 case "$prerequisite" in 289 !*) 290 negative_prereq=t 291 prerequisite=${prerequisite#!} 292 ;; 293 *) 294 negative_prereq= 295 esac 296 297 case " $lazily_tested_prereq " in 298 *" $prerequisite "*) 299 ;; 300 *) 301 case " $lazily_testable_prereq " in 302 *" $prerequisite "*) 303 eval "script=\$test_prereq_lazily_$prerequisite" && 304 if test_run_lazy_prereq_ "$prerequisite" "$script" 305 then 306 test_set_prereq $prerequisite 307 fi 308 lazily_tested_prereq="$lazily_tested_prereq$prerequisite " 309 esac 310 ;; 311 esac 312 313 total_prereq=$(($total_prereq + 1)) 314 case "$satisfied_prereq" in 315 *" $prerequisite "*) 316 satisfied_this_prereq=t 317 ;; 318 *) 319 satisfied_this_prereq= 320 esac 321 322 case "$satisfied_this_prereq,$negative_prereq" in 323 t,|,t) 324 ok_prereq=$(($ok_prereq + 1)) 325 ;; 326 *) 327 # Keep a list of missing prerequisites; restore 328 # the negative marker if necessary. 329 prerequisite=${negative_prereq:+!}$prerequisite 330 if test -z "$missing_prereq" 331 then 332 missing_prereq=$prerequisite 333 else 334 missing_prereq="$prerequisite,$missing_prereq" 335 fi 336 esac 337 done 338 339 test $total_prereq = $ok_prereq 340} 341 342test_declared_prereq () { 343 case ",$test_prereq," in 344 *,$1,*) 345 return 0 346 ;; 347 esac 348 return 1 349} 350 351test_expect_failure () { 352 test_start_ 353 test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq= 354 test "$#" = 2 || 355 error "bug in the test script: not 2 or 3 parameters to test-expect-failure" 356 export test_prereq 357 if ! test_skip "$@" 358 then 359 say >&3 "checking known breakage: $2" 360 if test_run_ "$2" expecting_failure 361 then 362 test_known_broken_ok_ "$1" 363 else 364 test_known_broken_failure_ "$1" 365 fi 366 fi 367 test_finish_ 368} 369 370test_expect_success () { 371 test_start_ 372 test "$#" = 3 && { test_prereq=$1; shift; } || test_prereq= 373 test "$#" = 2 || 374 error "bug in the test script: not 2 or 3 parameters to test-expect-success" 375 export test_prereq 376 if ! test_skip "$@" 377 then 378 say >&3 "expecting success: $2" 379 if test_run_ "$2" 380 then 381 test_ok_ "$1" 382 else 383 test_failure_ "$@" 384 fi 385 fi 386 test_finish_ 387} 388 389# test_external runs external test scripts that provide continuous 390# test output about their progress, and succeeds/fails on 391# zero/non-zero exit code. It outputs the test output on stdout even 392# in non-verbose mode, and announces the external script with "# run 393# <n>: ..." before running it. When providing relative paths, keep in 394# mind that all scripts run in "trash directory". 395# Usage: test_external description command arguments... 396# Example: test_external 'Perl API' perl ../path/to/test.pl 397test_external () { 398 test "$#" = 4 && { test_prereq=$1; shift; } || test_prereq= 399 test "$#" = 3 || 400 error >&5 "bug in the test script: not 3 or 4 parameters to test_external" 401 descr="$1" 402 shift 403 export test_prereq 404 if ! test_skip "$descr" "$@" 405 then 406 # Announce the script to reduce confusion about the 407 # test output that follows. 408 say_color "" "# run $test_count: $descr ($*)" 409 # Export TEST_DIRECTORY, TRASH_DIRECTORY and GIT_TEST_LONG 410 # to be able to use them in script 411 export TEST_DIRECTORY TRASH_DIRECTORY GIT_TEST_LONG 412 # Run command; redirect its stderr to &4 as in 413 # test_run_, but keep its stdout on our stdout even in 414 # non-verbose mode. 415 "$@" 2>&4 416 if test "$?" = 0 417 then 418 if test $test_external_has_tap -eq 0; then 419 test_ok_ "$descr" 420 else 421 say_color "" "# test_external test $descr was ok" 422 test_success=$(($test_success + 1)) 423 fi 424 else 425 if test $test_external_has_tap -eq 0; then 426 test_failure_ "$descr" "$@" 427 else 428 say_color error "# test_external test $descr failed: $@" 429 test_failure=$(($test_failure + 1)) 430 fi 431 fi 432 fi 433} 434 435# Like test_external, but in addition tests that the command generated 436# no output on stderr. 437test_external_without_stderr () { 438 # The temporary file has no (and must have no) security 439 # implications. 440 tmp=${TMPDIR:-/tmp} 441 stderr="$tmp/git-external-stderr.$$.tmp" 442 test_external "$@" 4> "$stderr" 443 test -f "$stderr" || error "Internal error: $stderr disappeared." 444 descr="no stderr: $1" 445 shift 446 say >&3 "# expecting no stderr from previous command" 447 if test ! -s "$stderr" 448 then 449 rm "$stderr" 450 451 if test $test_external_has_tap -eq 0; then 452 test_ok_ "$descr" 453 else 454 say_color "" "# test_external_without_stderr test $descr was ok" 455 test_success=$(($test_success + 1)) 456 fi 457 else 458 if test "$verbose" = t 459 then 460 output=$(echo; echo "# Stderr is:"; cat "$stderr") 461 else 462 output= 463 fi 464 # rm first in case test_failure exits. 465 rm "$stderr" 466 if test $test_external_has_tap -eq 0; then 467 test_failure_ "$descr" "$@" "$output" 468 else 469 say_color error "# test_external_without_stderr test $descr failed: $@: $output" 470 test_failure=$(($test_failure + 1)) 471 fi 472 fi 473} 474 475# debugging-friendly alternatives to "test [-f|-d|-e]" 476# The commands test the existence or non-existence of $1. $2 can be 477# given to provide a more precise diagnosis. 478test_path_is_file () { 479 if ! test -f "$1" 480 then 481 echo "File $1 doesn't exist. $2" 482 false 483 fi 484} 485 486test_path_is_dir () { 487 if ! test -d "$1" 488 then 489 echo "Directory $1 doesn't exist. $2" 490 false 491 fi 492} 493 494# Check if the directory exists and is empty as expected, barf otherwise. 495test_dir_is_empty () { 496 test_path_is_dir "$1" && 497 if test -n "$(ls -a1 "$1" | egrep -v '^\.\.?$')" 498 then 499 echo "Directory '$1' is not empty, it contains:" 500 ls -la "$1" 501 return 1 502 fi 503} 504 505test_path_is_missing () { 506 if test -e "$1" 507 then 508 echo "Path exists:" 509 ls -ld "$1" 510 if test $# -ge 1 511 then 512 echo "$*" 513 fi 514 false 515 fi 516} 517 518# test_line_count checks that a file has the number of lines it 519# ought to. For example: 520# 521# test_expect_success 'produce exactly one line of output' ' 522# do something >output && 523# test_line_count = 1 output 524# ' 525# 526# is like "test $(wc -l <output) = 1" except that it passes the 527# output through when the number of lines is wrong. 528 529test_line_count () { 530 if test $# != 3 531 then 532 error "bug in the test script: not 3 parameters to test_line_count" 533 elif ! test $(wc -l <"$3") "$1" "$2" 534 then 535 echo "test_line_count: line count for $3 !$1 $2" 536 cat "$3" 537 return 1 538 fi 539} 540 541# This is not among top-level (test_expect_success | test_expect_failure) 542# but is a prefix that can be used in the test script, like: 543# 544# test_expect_success 'complain and die' ' 545# do something && 546# do something else && 547# test_must_fail git checkout ../outerspace 548# ' 549# 550# Writing this as "! git checkout ../outerspace" is wrong, because 551# the failure could be due to a segv. We want a controlled failure. 552 553test_must_fail () { 554 "$@" 555 exit_code=$? 556 if test $exit_code = 0; then 557 echo >&2 "test_must_fail: command succeeded: $*" 558 return 1 559 elif test $exit_code -gt 129 && test $exit_code -le 192; then 560 echo >&2 "test_must_fail: died by signal: $*" 561 return 1 562 elif test $exit_code = 127; then 563 echo >&2 "test_must_fail: command not found: $*" 564 return 1 565 elif test $exit_code = 126; then 566 echo >&2 "test_must_fail: valgrind error: $*" 567 return 1 568 fi 569 return 0 570} 571 572# Similar to test_must_fail, but tolerates success, too. This is 573# meant to be used in contexts like: 574# 575# test_expect_success 'some command works without configuration' ' 576# test_might_fail git config --unset all.configuration && 577# do something 578# ' 579# 580# Writing "git config --unset all.configuration || :" would be wrong, 581# because we want to notice if it fails due to segv. 582 583test_might_fail () { 584 "$@" 585 exit_code=$? 586 if test $exit_code -gt 129 && test $exit_code -le 192; then 587 echo >&2 "test_might_fail: died by signal: $*" 588 return 1 589 elif test $exit_code = 127; then 590 echo >&2 "test_might_fail: command not found: $*" 591 return 1 592 fi 593 return 0 594} 595 596# Similar to test_must_fail and test_might_fail, but check that a 597# given command exited with a given exit code. Meant to be used as: 598# 599# test_expect_success 'Merge with d/f conflicts' ' 600# test_expect_code 1 git merge "merge msg" B master 601# ' 602 603test_expect_code () { 604 want_code=$1 605 shift 606 "$@" 607 exit_code=$? 608 if test $exit_code = $want_code 609 then 610 return 0 611 fi 612 613 echo >&2 "test_expect_code: command exited with $exit_code, we wanted $want_code $*" 614 return 1 615} 616 617# test_cmp is a helper function to compare actual and expected output. 618# You can use it like: 619# 620# test_expect_success 'foo works' ' 621# echo expected >expected && 622# foo >actual && 623# test_cmp expected actual 624# ' 625# 626# This could be written as either "cmp" or "diff -u", but: 627# - cmp's output is not nearly as easy to read as diff -u 628# - not all diff versions understand "-u" 629 630test_cmp() { 631 $GIT_TEST_CMP "$@" 632} 633 634# test_cmp_bin - helper to compare binary files 635 636test_cmp_bin() { 637 cmp "$@" 638} 639 640# Call any command "$@" but be more verbose about its 641# failure. This is handy for commands like "test" which do 642# not output anything when they fail. 643verbose () { 644 "$@" && return 0 645 echo >&2 "command failed: $(git rev-parse --sq-quote "$@")" 646 return 1 647} 648 649# Check if the file expected to be empty is indeed empty, and barfs 650# otherwise. 651 652test_must_be_empty () { 653 if test -s "$1" 654 then 655 echo "'$1' is not empty, it contains:" 656 cat "$1" 657 return 1 658 fi 659} 660 661# Tests that its two parameters refer to the same revision 662test_cmp_rev () { 663 git rev-parse --verify "$1" >expect.rev && 664 git rev-parse --verify "$2" >actual.rev && 665 test_cmp expect.rev actual.rev 666} 667 668# Print a sequence of numbers or letters in increasing order. This is 669# similar to GNU seq(1), but the latter might not be available 670# everywhere (and does not do letters). It may be used like: 671# 672# for i in $(test_seq 100) 673# do 674# for j in $(test_seq 10 20) 675# do 676# for k in $(test_seq a z) 677# do 678# echo $i-$j-$k 679# done 680# done 681# done 682 683test_seq () { 684 case $# in 685 1) set 1 "$@" ;; 686 2) ;; 687 *) error "bug in the test script: not 1 or 2 parameters to test_seq" ;; 688 esac 689 perl -le 'print for $ARGV[0]..$ARGV[1]' -- "$@" 690} 691 692# This function can be used to schedule some commands to be run 693# unconditionally at the end of the test to restore sanity: 694# 695# test_expect_success 'test core.capslock' ' 696# git config core.capslock true && 697# test_when_finished "git config --unset core.capslock" && 698# hello world 699# ' 700# 701# That would be roughly equivalent to 702# 703# test_expect_success 'test core.capslock' ' 704# git config core.capslock true && 705# hello world 706# git config --unset core.capslock 707# ' 708# 709# except that the greeting and config --unset must both succeed for 710# the test to pass. 711# 712# Note that under --immediate mode, no clean-up is done to help diagnose 713# what went wrong. 714 715test_when_finished () { 716 test_cleanup="{ $* 717 } && (exit \"\$eval_ret\"); eval_ret=\$?; $test_cleanup" 718} 719 720# Most tests can use the created repository, but some may need to create more. 721# Usage: test_create_repo <directory> 722test_create_repo () { 723 test "$#" = 1 || 724 error "bug in the test script: not 1 parameter to test-create-repo" 725 repo="$1" 726 mkdir -p "$repo" 727 ( 728 cd "$repo" || error "Cannot setup test environment" 729 "$GIT_EXEC_PATH/git-init" "--template=$GIT_BUILD_DIR/templates/blt/" >&3 2>&4 || 730 error "cannot run git init -- have you built things yet?" 731 mv .git/hooks .git/hooks-disabled 732 ) || exit 733} 734 735# This function helps on symlink challenged file systems when it is not 736# important that the file system entry is a symbolic link. 737# Use test_ln_s_add instead of "ln -s x y && git add y" to add a 738# symbolic link entry y to the index. 739 740test_ln_s_add () { 741 if test_have_prereq SYMLINKS 742 then 743 ln -s "$1" "$2" && 744 git update-index --add "$2" 745 else 746 printf '%s' "$1" >"$2" && 747 ln_s_obj=$(git hash-object -w "$2") && 748 git update-index --add --cacheinfo 120000 $ln_s_obj "$2" && 749 # pick up stat info from the file 750 git update-index "$2" 751 fi 752} 753 754# This function writes out its parameters, one per line 755test_write_lines () { 756 printf "%s\n" "$@" 757} 758 759perl () { 760 command "$PERL_PATH" "$@" 761} 762 763# Is the value one of the various ways to spell a boolean true/false? 764test_normalize_bool () { 765 git -c magic.variable="$1" config --bool magic.variable 2>/dev/null 766} 767 768# Given a variable $1, normalize the value of it to one of "true", 769# "false", or "auto" and store the result to it. 770# 771# test_tristate GIT_TEST_HTTPD 772# 773# A variable set to an empty string is set to 'false'. 774# A variable set to 'false' or 'auto' keeps its value. 775# Anything else is set to 'true'. 776# An unset variable defaults to 'auto'. 777# 778# The last rule is to allow people to set the variable to an empty 779# string and export it to decline testing the particular feature 780# for versions both before and after this change. We used to treat 781# both unset and empty variable as a signal for "do not test" and 782# took any non-empty string as "please test". 783 784test_tristate () { 785 if eval "test x\"\${$1+isset}\" = xisset" 786 then 787 # explicitly set 788 eval " 789 case \"\$$1\" in 790 '') $1=false ;; 791 auto) ;; 792 *) $1=\$(test_normalize_bool \$$1 || echo true) ;; 793 esac 794 " 795 else 796 eval "$1=auto" 797 fi 798} 799 800# Exit the test suite, either by skipping all remaining tests or by 801# exiting with an error. If "$1" is "auto", we then we assume we were 802# opportunistically trying to set up some tests and we skip. If it is 803# "true", then we report a failure. 804# 805# The error/skip message should be given by $2. 806# 807test_skip_or_die () { 808 case "$1" in 809 auto) 810 skip_all=$2 811 test_done 812 ;; 813 true) 814 error "$2" 815 ;; 816 *) 817 error "BUG: test tristate is '$1' (real error: $2)" 818 esac 819} 820 821# The following mingw_* functions obey POSIX shell syntax, but are actually 822# bash scripts, and are meant to be used only with bash on Windows. 823 824# A test_cmp function that treats LF and CRLF equal and avoids to fork 825# diff when possible. 826mingw_test_cmp () { 827 # Read text into shell variables and compare them. If the results 828 # are different, use regular diff to report the difference. 829 local test_cmp_a= test_cmp_b= 830 831 # When text came from stdin (one argument is '-') we must feed it 832 # to diff. 833 local stdin_for_diff= 834 835 # Since it is difficult to detect the difference between an 836 # empty input file and a failure to read the files, we go straight 837 # to diff if one of the inputs is empty. 838 if test -s "$1" && test -s "$2" 839 then 840 # regular case: both files non-empty 841 mingw_read_file_strip_cr_ test_cmp_a <"$1" 842 mingw_read_file_strip_cr_ test_cmp_b <"$2" 843 elif test -s "$1" && test "$2" = - 844 then 845 # read 2nd file from stdin 846 mingw_read_file_strip_cr_ test_cmp_a <"$1" 847 mingw_read_file_strip_cr_ test_cmp_b 848 stdin_for_diff='<<<"$test_cmp_b"' 849 elif test "$1" = - && test -s "$2" 850 then 851 # read 1st file from stdin 852 mingw_read_file_strip_cr_ test_cmp_a 853 mingw_read_file_strip_cr_ test_cmp_b <"$2" 854 stdin_for_diff='<<<"$test_cmp_a"' 855 fi 856 test -n "$test_cmp_a" && 857 test -n "$test_cmp_b" && 858 test "$test_cmp_a" = "$test_cmp_b" || 859 eval "diff -u \"\$@\" $stdin_for_diff" 860} 861 862# $1 is the name of the shell variable to fill in 863mingw_read_file_strip_cr_ () { 864 # Read line-wise using LF as the line separator 865 # and use IFS to strip CR. 866 local line 867 while : 868 do 869 if IFS=$'\r' read -r -d $'\n' line 870 then 871 # good 872 line=$line$'\n' 873 else 874 # we get here at EOF, but also if the last line 875 # was not terminated by LF; in the latter case, 876 # some text was read 877 if test -z "$line" 878 then 879 # EOF, really 880 break 881 fi 882 fi 883 eval "$1=\$$1\$line" 884 done 885}