1# source this file; set up for tests 2 3# Copyright (C) 2009-2023 Free Software Foundation, Inc. 4 5# This program is free software: you can redistribute it and/or modify 6# it under the terms of the GNU General Public License as published by 7# the Free Software Foundation, either version 3 of the License, or 8# (at your option) any later version. 9 10# This program is distributed in the hope that it will be useful, 11# but WITHOUT ANY WARRANTY; without even the implied warranty of 12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13# GNU General Public License for more details. 14 15# You should have received a copy of the GNU General Public License 16# along with this program. If not, see <https://www.gnu.org/licenses/>. 17 18# Using this file in a test 19# ========================= 20# 21# The typical skeleton of a test looks like this: 22# 23# #!/bin/sh 24# . "${srcdir=.}/init.sh"; path_prepend_ . 25# Execute some commands. 26# Note that these commands are executed in a subdirectory, therefore you 27# need to prepend "../" to relative filenames in the build directory. 28# Note that the "path_prepend_ ." is useful only if the body of your 29# test invokes programs residing in the initial directory. 30# For example, if the programs you want to test are in src/, and this test 31# script is named tests/test-1, then you would use "path_prepend_ ../src", 32# or perhaps export PATH='$(abs_top_builddir)/src$(PATH_SEPARATOR)'"$$PATH" 33# to all tests via automake's TESTS_ENVIRONMENT. 34# Set the exit code 0 for success, 77 for skipped, or 1 or other for failure. 35# Use the skip_ and fail_ functions to print a diagnostic and then exit 36# with the corresponding exit code. 37# Exit $? 38 39# Executing a test that uses this file 40# ==================================== 41# 42# Running a single test: 43# $ make check TESTS=test-foo.sh 44# 45# Running a single test, with verbose output: 46# $ make check TESTS=test-foo.sh VERBOSE=yes 47# 48# Running a single test, keeping the temporary directory: 49# $ make check TESTS=test-foo.sh KEEP=yes 50# 51# Running a single test, with single-stepping: 52# 1. Go into a sub-shell: 53# $ bash 54# 2. Set relevant environment variables from TESTS_ENVIRONMENT in the 55# Makefile: 56# $ export srcdir=../../tests # this is an example 57# 3. Execute the commands from the test, copy&pasting them one by one: 58# $ . "$srcdir/init.sh"; path_prepend_ . 59# ... 60# 4. Finally 61# $ exit 62 63# ============================================================================= 64# Elementary diagnostics 65 66ME_=`expr "./$0" : '.*/\(.*\)$'` 67 68# Prepare PATH_SEPARATOR. 69# The user is always right. 70if test "${PATH_SEPARATOR+set}" != set; then 71 # Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which 72 # contains only /bin. Note that ksh looks also at the FPATH variable, 73 # so we have to set that as well for the test. 74 PATH_SEPARATOR=: 75 (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \ 76 && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \ 77 || PATH_SEPARATOR=';' 78 } 79fi 80 81# We use a trap below for cleanup. This requires us to go through 82# hoops to get the right exit status transported through the handler. 83# So use 'Exit STATUS' instead of 'exit STATUS' inside of the tests. 84# Turn off errexit here so that we don't trip the bug with OSF1/Tru64 85# sh inside this function. 86Exit () { set +e; (exit $1); exit $1; } 87 88# Print warnings (e.g., about skipped and failed tests) to this file number. 89# Override by defining to say, 9, in init.cfg, and putting say, 90# export ...ENVVAR_SETTINGS...; $(SHELL) 9>&2 91# in the definition of TESTS_ENVIRONMENT in your tests/Makefile.am file. 92# This is useful when using automake's parallel tests mode, to print 93# the reason for skip/failure to console, rather than to the .log files. 94: ${stderr_fileno_=2} 95 96# Note that correct expansion of "$*" depends on IFS starting with ' '. 97# Always write the full diagnostic to stderr. 98# When stderr_fileno_ is not 2, also emit the first line of the 99# diagnostic to that file descriptor. 100warn_ () 101{ 102 # If IFS does not start with ' ', set it and emit the warning in a subshell. 103 case $IFS in 104 ' '*) printf '%s\n' "$*" >&2 105 test $stderr_fileno_ = 2 \ 106 || { printf '%s\n' "$*" | sed 1q >&$stderr_fileno_ ; } ;; 107 *) (IFS=' '; warn_ "$@");; 108 esac 109} 110fail_ () { warn_ "$ME_: failed test: $@"; Exit 1; } 111skip_ () { warn_ "$ME_: skipped test: $@"; Exit 77; } 112fatal_ () { warn_ "$ME_: hard error: $@"; Exit 99; } 113framework_failure_ () { warn_ "$ME_: set-up failure: $@"; Exit 99; } 114 115# ============================================================================= 116# Ensure the shell supports modern syntax. 117 118# Sanitize this shell to POSIX mode, if possible. 119DUALCASE=1; export DUALCASE 120if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then 121 emulate sh 122 NULLCMD=: 123 alias -g '${1+"$@"}'='"$@"' 124 setopt NO_GLOB_SUBST 125else 126 case `(set -o) 2>/dev/null` in 127 *posix*) set -o posix ;; 128 esac 129fi 130 131# We require $(...) support unconditionally. 132# We require that the printf built-in work correctly regarding octal escapes; 133# this eliminates /bin/sh on AIX 7.2. 134# We require non-surprising "local" semantics (this eliminates dash). 135# This takes the admittedly draconian step of eliminating dash, because the 136# assignment tab=$(printf '\t') works fine, yet preceding it with "local " 137# transforms it into an assignment that sets the variable to the empty string. 138# That is too counter-intuitive, and can lead to subtle run-time malfunction. 139# The example below is less subtle in that with dash, it evokes the run-time 140# exception "dash: 1: local: 1: bad variable name". 141# We require a few additional shell features only when $EXEEXT is nonempty, 142# in order to support automatic $EXEEXT emulation: 143# - hyphen-containing alias names 144# - we prefer to use ${var#...} substitution, rather than having 145# to work around lack of support for that feature. 146# The following code attempts to find a shell with support for these features. 147# If the current shell passes the test, we're done. Otherwise, test other 148# shells until we find one that passes. If one is found, re-exec it. 149# If no acceptable shell is found, skip the current test. 150# 151# The "...set -x; P=1 true 2>err..." test is to disqualify any shell that 152# emits "P=1" into err, as /bin/sh from SunOS 5.11 and OpenBSD 4.7 do. 153# 154# Use "9" to indicate success (rather than 0), in case some shell acts 155# like Solaris 10's /bin/sh but exits successfully instead of with status 2. 156 157# Eval this code in a subshell to determine a shell's suitability. 158# 10 - passes all tests; ok to use 159# 9 - ok, but enabling "set -x" corrupts app stderr; prefer higher score 160# ? - not ok 161gl_shell_test_script_=' 162test $(echo y) = y || exit 1 163LC_ALL=en_US.UTF-8 printf "\\351" 2>/dev/null \ 164 | LC_ALL=C tr "\\351" x | LC_ALL=C grep "^x$" > /dev/null \ 165 || exit 1 166printf "\\351" 2>/dev/null \ 167 | LC_ALL=C tr "\\351" x | LC_ALL=C grep "^x$" > /dev/null \ 168 || exit 1 169f_local_() { local v=1; }; f_local_ || exit 1 170f_dash_local_fail_() { local t=$(printf " 1"); }; f_dash_local_fail_ 171score_=10 172if test "$VERBOSE" = yes; then 173 test -n "$( (exec 3>&1; set -x; P=1 true 2>&3) 2> /dev/null)" && score_=9 174fi 175test -z "$EXEEXT" && exit $score_ 176shopt -s expand_aliases 177alias a-b="echo zoo" 178v=abx 179 test ${v%x} = ab \ 180 && test ${v#a} = bx \ 181 && test $(a-b) = zoo \ 182 && exit $score_ 183' 184 185if test "x$1" = "x--no-reexec"; then 186 shift 187else 188 # Assume a working shell. Export to subshells (setup_ needs this). 189 gl_set_x_corrupts_stderr_=false 190 export gl_set_x_corrupts_stderr_ 191 192 # Record the first marginally acceptable shell. 193 marginal_= 194 195 # Search for a shell that meets our requirements. 196 for re_shell_ in __current__ "${CONFIG_SHELL:-no_shell}" \ 197 /bin/sh bash dash zsh pdksh fail 198 do 199 test "$re_shell_" = no_shell && continue 200 201 # If we've made it all the way to the sentinel, "fail" without 202 # finding even a marginal shell, skip this test. 203 if test "$re_shell_" = fail; then 204 test -z "$marginal_" && skip_ failed to find an adequate shell 205 re_shell_=$marginal_ 206 break 207 fi 208 209 # When testing the current shell, simply "eval" the test code. 210 # Otherwise, run it via $re_shell_ -c ... 211 if test "$re_shell_" = __current__; then 212 # 'eval'ing this code makes Solaris 10's /bin/sh exit with 213 # $? set to 2. It does not evaluate any of the code after the 214 # "unexpected" first '('. Thus, we must run it in a subshell. 215 ( eval "$gl_shell_test_script_" ) > /dev/null 2>&1 216 else 217 "$re_shell_" -c "$gl_shell_test_script_" 2>/dev/null 218 fi 219 220 st_=$? 221 222 # $re_shell_ works just fine. Use it. 223 if test $st_ = 10; then 224 gl_set_x_corrupts_stderr_=false 225 break 226 fi 227 228 # If this is our first marginally acceptable shell, remember it. 229 if test "$st_:$marginal_" = 9: ; then 230 marginal_="$re_shell_" 231 gl_set_x_corrupts_stderr_=true 232 fi 233 done 234 235 if test "$re_shell_" != __current__; then 236 # Found a usable shell. Preserve -v and -x. 237 case $- in 238 *v*x* | *x*v*) opts_=-vx ;; 239 *v*) opts_=-v ;; 240 *x*) opts_=-x ;; 241 *) opts_= ;; 242 esac 243 re_shell=$re_shell_ 244 export re_shell 245 exec "$re_shell_" $opts_ "$0" --no-reexec "$@" 246 echo "$ME_: exec failed" 1>&2 247 exit 127 248 fi 249fi 250 251# ============================================================================= 252# Ensure the shell behaves reasonably. 253 254# If this is bash, turn off all aliases. 255test -n "$BASH_VERSION" && unalias -a 256 257# Note that when supporting $EXEEXT (transparently mapping from PROG_NAME to 258# PROG_NAME.exe), we want to support hyphen-containing names like test-acos. 259# That is part of the shell-selection test above. Why use aliases rather 260# than functions? Because support for hyphen-containing aliases is more 261# widespread than that for hyphen-containing function names. 262test -n "$EXEEXT" && test -n "$BASH_VERSION" && shopt -s expand_aliases 263 264# ============================================================================= 265# Creating a temporary directory (needed by the core test framework) 266 267# Create a temporary directory, much like mktemp -d does. 268# Written by Jim Meyering. 269# 270# Usage: mktempd_ /tmp phoey.XXXXXXXXXX 271# 272# First, try to use the mktemp program. 273# Failing that, we'll roll our own mktemp-like function: 274# - try to get random bytes from /dev/urandom, mapping them to file-name bytes 275# - failing that, generate output from a combination of quickly-varying 276# sources and awk. 277# - try to create the desired directory. 278# - make only $MAX_TRIES_ attempts 279 280# Helper function. Print $N pseudo-random bytes from a-zA-Z0-9. 281rand_bytes_ () 282{ 283 n_=$1 284 285 # Maybe try openssl rand -base64 $n_prime_|tr '+/=\012' abcd first? 286 # But if they have openssl, they probably have mktemp, too. 287 288 chars_=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 289 dev_rand_=/dev/urandom 290 if test -r "$dev_rand_"; then 291 # Note: 256-length($chars_) == 194; 3 copies of $chars_ is 186 + 8 = 194. 292 dd ibs=$n_ count=1 if=$dev_rand_ 2>/dev/null \ 293 | LC_ALL=C tr -c $chars_ 01234567$chars_$chars_$chars_ 294 return 295 fi 296 297 # Fall back on quickly-varying sources + awk. 298 # Limit awk program to 7th Edition Unix so that it works even on Solaris 10. 299 300 (date; date +%N; free; who -a; w; ps auxww; ps -ef) 2>&1 | awk ' 301 BEGIN { 302 n = '"$n_"' 303 for (i = 0; i < 256; i++) 304 ordinal[sprintf ("%c", i)] = i 305 } 306 { 307 for (i = 1; i <= length; i++) 308 a[ai++ % n] += ordinal[substr ($0, i, 1)] 309 } 310 END { 311 chars = "'"$chars_"'" 312 charslen = length (chars) 313 for (i = 0; i < n; i++) 314 printf "%s", substr (chars, a[i] % charslen + 1, 1) 315 printf "\n" 316 } 317 ' 318} 319 320mktempd_ () 321{ 322 case $# in 323 2);; 324 *) fail_ "Usage: mktempd_ DIR TEMPLATE";; 325 esac 326 327 destdir_=$1 328 template_=$2 329 330 MAX_TRIES_=4 331 332 # Disallow any trailing slash on specified destdir: 333 # it would subvert the post-mktemp "case"-based destdir test. 334 case $destdir_ in 335 / | //) destdir_slash_=$destdir;; 336 */) fail_ "invalid destination dir: remove trailing slash(es)";; 337 *) destdir_slash_=$destdir_/;; 338 esac 339 340 case $template_ in 341 *XXXX) ;; 342 *) fail_ \ 343 "invalid template: $template_ (must have a suffix of at least 4 X's)";; 344 esac 345 346 # First, try to use mktemp. 347 d=`unset TMPDIR; { mktemp -d -t -p "$destdir_" "$template_"; } 2>/dev/null` && 348 349 # The resulting name must be in the specified directory. 350 case $d in "$destdir_slash_"*) :;; *) false;; esac && 351 352 # It must have created the directory. 353 test -d "$d" && 354 355 # It must have 0700 permissions. Handle sticky "S" bits. 356 perms=`ls -dgo "$d" 2>/dev/null` && 357 case $perms in drwx--[-S]---*) :;; *) false;; esac && { 358 echo "$d" 359 return 360 } 361 362 # If we reach this point, we'll have to create a directory manually. 363 364 # Get a copy of the template without its suffix of X's. 365 base_template_=`echo "$template_"|sed 's/XX*$//'` 366 367 # Calculate how many X's we've just removed. 368 template_length_=`echo "$template_" | wc -c` 369 nx_=`echo "$base_template_" | wc -c` 370 nx_=`expr $template_length_ - $nx_` 371 372 err_= 373 i_=1 374 while :; do 375 X_=`rand_bytes_ $nx_` 376 candidate_dir_="$destdir_slash_$base_template_$X_" 377 err_=`mkdir -m 0700 "$candidate_dir_" 2>&1` \ 378 && { echo "$candidate_dir_"; return; } 379 test $MAX_TRIES_ -le $i_ && break; 380 i_=`expr $i_ + 1` 381 done 382 fail_ "$err_" 383} 384 385# ============================================================================= 386# Core test framework 387 388# An arbitrary prefix to help distinguish test directories. 389testdir_prefix_ () { printf gt; } 390 391# Set up the environment for the test to run in. 392setup_ () 393{ 394 if test "$VERBOSE" = yes; then 395 # Test whether set -x may cause the selected shell to corrupt an 396 # application's stderr. Many do, including zsh-4.3.10 and the /bin/sh 397 # from SunOS 5.11, OpenBSD 4.7 and Irix 6.5. 398 # If enabling verbose output this way would cause trouble, simply 399 # issue a warning and refrain. 400 if $gl_set_x_corrupts_stderr_; then 401 warn_ "using SHELL=$SHELL with 'set -x' corrupts stderr" 402 else 403 set -x 404 fi 405 fi 406 407 initial_cwd_=$PWD 408 409 # Create and enter the temporary directory. 410 pfx_=`testdir_prefix_` 411 test_dir_=`mktempd_ "$initial_cwd_" "$pfx_-$ME_.XXXX"` \ 412 || fail_ "failed to create temporary directory in $initial_cwd_" 413 cd "$test_dir_" || fail_ "failed to cd to temporary directory" 414 # Set variables srcdir, builddir, for the convenience of the test. 415 case $srcdir in 416 /* | ?:*) ;; 417 *) srcdir="../$srcdir" ;; 418 esac 419 builddir=".." 420 export srcdir builddir 421 422 # As autoconf-generated configure scripts do, ensure that IFS 423 # is defined initially, so that saving and restoring $IFS works. 424 gl_init_sh_nl_=' 425' 426 IFS=" "" $gl_init_sh_nl_" 427 428 # This trap statement, along with a trap on 0 below, ensure that the 429 # temporary directory, $test_dir_, is removed upon exit as well as 430 # upon receipt of any of the listed signals. 431 for sig_ in 1 2 3 13 15; do 432 eval "trap 'Exit $(expr $sig_ + 128)' $sig_" 433 done 434 435 # Remove relative and non-accessible directories from PATH, including '.' 436 # and Zero-length entries. 437 saved_IFS="$IFS" 438 IFS=: 439 new_PATH= 440 sep_= 441 for dir in $PATH; do 442 case "$dir" in 443 /*) test -d "$dir/." || continue 444 new_PATH="${new_PATH}${sep_}${dir}" 445 sep_=':';; 446 esac 447 done 448 IFS="$saved_IFS" 449 PATH="$new_PATH" 450 export PATH 451} 452 453# This is a stub function that is run upon trap (upon regular exit and 454# interrupt). Override it with a per-test function, e.g., to unmount 455# a partition, or to undo any other global state changes. 456cleanup_ () { :; } 457 458# Run the user-overridable cleanup_ function, remove the temporary 459# directory and exit with the incoming value of $?. 460remove_tmp_ () 461{ 462 __st=$? 463 cleanup_ 464 if test "$KEEP" = yes; then 465 echo "Not removing temporary directory $test_dir_" 466 else 467 # cd out of the directory we're about to remove 468 cd "$initial_cwd_" || cd / || cd /tmp 469 chmod -R u+rwx "$test_dir_" 470 # If removal fails and exit status was to be 0, then change it to 1. 471 rm -rf "$test_dir_" || { test $__st = 0 && __st=1; } 472 fi 473 exit $__st 474} 475 476# ============================================================================= 477# Prepending directories to PATH 478 479# Given a directory name, DIR, if every entry in it that matches *.exe 480# contains only the specified bytes (see the case stmt below), then print 481# a space-separated list of those names and return 0. Otherwise, don't 482# print anything and return 1. Naming constraints apply also to DIR. 483find_exe_basenames_ () 484{ 485 feb_dir_=$1 486 feb_fail_=0 487 feb_result_= 488 feb_sp_= 489 for feb_file_ in $feb_dir_/*.exe; do 490 # If there was no *.exe file, or there existed a file named "*.exe" that 491 # was deleted between the above glob expansion and the existence test 492 # below, just skip it. 493 test "x$feb_file_" = "x$feb_dir_/*.exe" && test ! -f "$feb_file_" \ 494 && continue 495 # Exempt [.exe, since we can't create a function by that name, yet 496 # we can't invoke [ by PATH search anyways due to shell builtins. 497 test "x$feb_file_" = "x$feb_dir_/[.exe" && continue 498 case $feb_file_ in 499 *[!-a-zA-Z/0-9_.+]*) feb_fail_=1; break;; 500 *) # Remove leading file name components as well as the .exe suffix. 501 feb_file_=${feb_file_##*/} 502 feb_file_=${feb_file_%.exe} 503 feb_result_="$feb_result_$feb_sp_$feb_file_";; 504 esac 505 feb_sp_=' ' 506 done 507 test $feb_fail_ = 0 && printf %s "$feb_result_" 508 return $feb_fail_ 509} 510 511# Consider the files in directory, $1. 512# For each file name of the form PROG.exe, create an alias named 513# PROG that simply invokes PROG.exe, then return 0. If any selected 514# file name or the directory name, $1, contains an unexpected character, 515# define no alias and return 1. 516create_exe_shims_ () 517{ 518 case $EXEEXT in 519 '') return 0 ;; 520 .exe) ;; 521 *) echo "$0: unexpected \$EXEEXT value: $EXEEXT" 1>&2; return 1 ;; 522 esac 523 524 base_names_=`find_exe_basenames_ $1` \ 525 || { echo "$0 (exe_shim): skipping directory: $1" 1>&2; return 0; } 526 527 if test -n "$base_names_"; then 528 for base_ in $base_names_; do 529 alias "$base_"="$base_$EXEEXT" 530 done 531 fi 532 533 return 0 534} 535 536# Use this function to prepend to PATH an absolute name for each 537# specified, possibly-$initial_cwd_-relative, directory. 538path_prepend_ () 539{ 540 while test $# != 0; do 541 path_dir_=$1 542 case $path_dir_ in 543 '') fail_ "invalid path dir: '$1'";; 544 /* | ?:*) abs_path_dir_=$path_dir_;; 545 *) abs_path_dir_=$initial_cwd_/$path_dir_;; 546 esac 547 case $abs_path_dir_ in 548 *$PATH_SEPARATOR*) fail_ "invalid path dir: '$abs_path_dir_'";; 549 esac 550 PATH="$abs_path_dir_$PATH_SEPARATOR$PATH" 551 552 # Create an alias, FOO, for each FOO.exe in this directory. 553 create_exe_shims_ "$abs_path_dir_" \ 554 || fail_ "something failed (above): $abs_path_dir_" 555 shift 556 done 557 export PATH 558} 559 560# ============================================================================= 561# Convenience environment variables for the tests 562 563# ----------------------------------------------------------------------------- 564 565# Enable glibc's malloc-perturbing option. 566# This is useful for exposing code that depends on the fact that 567# malloc-related functions often return memory that is mostly zeroed. 568# If you have the time and cycles, use valgrind to do an even better job. 569: ${MALLOC_PERTURB_=87} 570export MALLOC_PERTURB_ 571 572# ----------------------------------------------------------------------------- 573 574# The interpreter for Bourne-shell scripts. 575# No special standards compatibility requirements. 576# Some environments, such as Android, don't have /bin/sh. 577if test -f /bin/sh$EXEEXT; then 578 BOURNE_SHELL=/bin/sh 579else 580 BOURNE_SHELL=sh 581fi 582 583# ============================================================================= 584# Convenience functions for the tests 585 586# ----------------------------------------------------------------------------- 587# Return value checking 588 589# This is used to simplify checking of the return value 590# which is useful when ensuring a command fails as desired. 591# I.e., just doing `command ... &&fail=1` will not catch 592# a segfault in command for example. With this helper you 593# instead check an explicit exit code like 594# returns_ 1 command ... || fail 595returns_ () { 596 # Disable tracing so it doesn't interfere with stderr of the wrapped command 597 { set +x; } 2>/dev/null 598 599 local exp_exit="$1" 600 shift 601 "$@" 602 test $? -eq $exp_exit && ret_=0 || ret_=1 603 604 if test "$VERBOSE" = yes && test "$gl_set_x_corrupts_stderr_" = false; then 605 set -x 606 fi 607 { return $ret_; } 2>/dev/null 608} 609 610# ----------------------------------------------------------------------------- 611# Text file comparison 612 613# Emit a header similar to that from diff -u; Print the simulated "diff" 614# command so that the order of arguments is clear. Don't bother with @@ lines. 615emit_diff_u_header_ () 616{ 617 printf '%s\n' "diff -u $*" \ 618 "--- $1 1970-01-01" \ 619 "+++ $2 1970-01-01" 620} 621 622# Arrange not to let diff or cmp operate on /dev/null, 623# since on some systems (at least OSF/1 5.1), that doesn't work. 624# When there are not two arguments, or no argument is /dev/null, return 2. 625# When one argument is /dev/null and the other is not empty, 626# cat the nonempty file to stderr and return 1. 627# Otherwise, return 0. 628compare_dev_null_ () 629{ 630 test $# = 2 || return 2 631 632 if test "x$1" = x/dev/null; then 633 test -s "$2" || return 0 634 emit_diff_u_header_ "$@"; sed 's/^/+/' "$2" 635 return 1 636 fi 637 638 if test "x$2" = x/dev/null; then 639 test -s "$1" || return 0 640 emit_diff_u_header_ "$@"; sed 's/^/-/' "$1" 641 return 1 642 fi 643 644 return 2 645} 646 647for diff_opt_ in -u -U3 -c '' no; do 648 test "$diff_opt_" != no && 649 diff_out_=`exec 2>/dev/null 650 LC_ALL=C diff $diff_opt_ "$0" "$0" < /dev/null` && 651 break 652done 653if test "$diff_opt_" != no; then 654 if test -z "$diff_out_"; then 655 compare_ () { LC_ALL=C diff $diff_opt_ "$@"; } 656 else 657 compare_ () 658 { 659 # If no differences were found, AIX and HP-UX 'diff' produce output 660 # like "No differences encountered". Hide this output. 661 LC_ALL=C diff $diff_opt_ "$@" > diff.out 662 diff_status_=$? 663 test $diff_status_ -eq 0 || cat diff.out || diff_status_=2 664 rm -f diff.out || diff_status_=2 665 return $diff_status_ 666 } 667 fi 668elif cmp -s /dev/null /dev/null 2>/dev/null; then 669 compare_ () { cmp -s "$@"; } 670else 671 compare_ () { cmp "$@"; } 672fi 673 674# Usage: compare EXPECTED ACTUAL 675# 676# Given compare_dev_null_'s preprocessing, defer to compare_ if 2 or more. 677# Otherwise, propagate $? to caller: any diffs have already been printed. 678compare () 679{ 680 # This looks like it can be factored to use a simple "case $?" 681 # after unchecked compare_dev_null_ invocation, but that would 682 # fail in a "set -e" environment. 683 if compare_dev_null_ "$@"; then 684 return 0 685 else 686 case $? in 687 1) return 1;; 688 *) compare_ "$@";; 689 esac 690 fi 691} 692 693# ----------------------------------------------------------------------------- 694 695# If you want to override the testdir_prefix_ function, 696# or to add more utility functions, use this file. 697test -f "$srcdir/init.cfg" \ 698 && . "$srcdir/init.cfg" 699 700# ============================================================================= 701# Set up the environment for the test to run in. 702 703setup_ "$@" 704# This trap is here, rather than in the setup_ function, because some 705# shells run the exit trap at shell function exit, rather than script exit. 706trap remove_tmp_ EXIT 707