t/test-lib.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   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 2 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 http://www.gnu.org/licenses/ .
  17
  18 # if --tee was passed, write the output not only to the terminal, but
  19 # additionally to the file test-results/$BASENAME.out, too.
  20 case "$GIT_TEST_TEE_STARTED, $* " in
  21 done,*)
  22         # do not redirect again
  23         ;;
  24 *' --tee '*|*' --va'*)
  25         mkdir -p test-results
  26         BASE=test-results/$(basename "$0" .sh)
  27         (GIT_TEST_TEE_STARTED=done ${SHELL-sh} "$0" "$@" 2>&1;
  28          echo $? > $BASE.exit) | tee $BASE.out
  29         test "$(cat $BASE.exit)" = 0
  30         exit
  31         ;;
  32 esac
  33
  34 # Keep the original TERM for say_color
  35 ORIGINAL_TERM=$TERM
  36
  37 # Test the binaries we have just built.  The tests are kept in
  38 # t/ subdirectory and are run in 'trash directory' subdirectory.
  39 if test -z "$TEST_DIRECTORY"
  40 then
  41         # We allow tests to override this, in case they want to run tests
  42         # outside of t/, e.g. for running tests on the test library
  43         # itself.
  44         TEST_DIRECTORY=$(pwd)
  45 fi
  46 if test -z "$TEST_OUTPUT_DIRECTORY"
  47 then
  48         # Similarly, override this to store the test-results subdir
  49         # elsewhere
  50         TEST_OUTPUT_DIRECTORY=$TEST_DIRECTORY
  51 fi
  52 GIT_BUILD_DIR="$TEST_DIRECTORY"/..
  53
  54 . "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
  55 export PERL_PATH SHELL_PATH
  56
  57 # For repeatability, reset the environment to known value.
  58 LANG=C
  59 LC_ALL=C
  60 PAGER=cat
  61 TZ=UTC
  62 TERM=dumb
  63 export LANG LC_ALL PAGER TERM TZ
  64 EDITOR=:
  65 # A call to "unset" with no arguments causes at least Solaris 10
  66 # /usr/xpg4/bin/sh and /bin/ksh to bail out.  So keep the unsets
  67 # deriving from the command substitution clustered with the other
  68 # ones.
  69 unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
  70         my @env = keys %ENV;
  71         my $ok = join("|", qw(
  72                 TRACE
  73                 DEBUG
  74                 USE_LOOKUP
  75                 TEST
  76                 .*_TEST
  77                 PROVE
  78                 VALGRIND
  79                 PERF_AGGREGATING_LATER
  80         ));
  81         my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
  82         print join("\n", @vars);
  83 ')
  84 unset XDG_CONFIG_HOME
  85 GIT_AUTHOR_EMAIL=author@example.com
  86 GIT_AUTHOR_NAME='A U Thor'
  87 GIT_COMMITTER_EMAIL=committer@example.com
  88 GIT_COMMITTER_NAME='C O Mitter'
  89 GIT_MERGE_VERBOSITY=5
  90 GIT_MERGE_AUTOEDIT=no
  91 export GIT_MERGE_VERBOSITY GIT_MERGE_AUTOEDIT
  92 export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
  93 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
  94 export EDITOR
  95
  96 # Protect ourselves from common misconfiguration to export
  97 # CDPATH into the environment
  98 unset CDPATH
  99
 100 unset GREP_OPTIONS
 101
 102 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
 103 1|2|true)
 104         echo "* warning: Some tests will not work if GIT_TRACE" \
 105                 "is set as to trace on STDERR ! *"
 106         echo "* warning: Please set GIT_TRACE to something" \
 107                 "other than 1, 2 or true ! *"
 108         ;;
 109 esac
 110
 111 # Convenience
 112 #
 113 # A regexp to match 5 and 40 hexdigits
 114 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
 115 _x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
 116
 117 # Zero SHA-1
 118 _z40=0000000000000000000000000000000000000000
 119
 120 # Line feed
 121 LF='
 122 '
 123
 124 export _x05 _x40 _z40 LF
 125
 126 # Each test should start with something like this, after copyright notices:
 127 #
 128 # test_description='Description of this test...
 129 # This test checks if command xyzzy does the right thing...
 130 # '
 131 # . ./test-lib.sh
 132 [ "x$ORIGINAL_TERM" != "xdumb" ] && (
 133                 TERM=$ORIGINAL_TERM &&
 134                 export TERM &&
 135                 [ -t 1 ] &&
 136                 tput bold >/dev/null 2>&1 &&
 137                 tput setaf 1 >/dev/null 2>&1 &&
 138                 tput sgr0 >/dev/null 2>&1
 139         ) &&
 140         color=t
 141
 142 while test "$#" -ne 0
 143 do
 144         case "$1" in
 145         -d|--d|--de|--deb|--debu|--debug)
 146                 debug=t; shift ;;
 147         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
 148                 immediate=t; shift ;;
 149         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
 150                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
 151         -h|--h|--he|--hel|--help)
 152                 help=t; shift ;;
 153         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
 154                 verbose=t; shift ;;
 155         -q|--q|--qu|--qui|--quie|--quiet)
 156                 # Ignore --quiet under a TAP::Harness. Saying how many tests
 157                 # passed without the ok/not ok details is always an error.
 158                 test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
 159         --with-dashes)
 160                 with_dashes=t; shift ;;
 161         --no-color)
 162                 color=; shift ;;
 163         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
 164                 valgrind=t; verbose=t; shift ;;
 165         --tee)
 166                 shift ;; # was handled already
 167         --root=*)
 168                 root=$(expr "z$1" : 'z[^=]*=\(.*\)')
 169                 shift ;;
 170         *)
 171                 echo "error: unknown test option '$1'" >&2; exit 1 ;;
 172         esac
 173 done
 174
 175 if test -n "$color"
 176 then
 177         say_color () {
 178                 (
 179                 TERM=$ORIGINAL_TERM
 180                 export TERM
 181                 case "$1" in
 182                 error)
 183                         tput bold; tput setaf 1;; # bold red
 184                 skip)
 185                         tput bold; tput setaf 2;; # bold green
 186                 pass)
 187                         tput setaf 2;;            # green
 188                 info)
 189                         tput setaf 3;;            # brown
 190                 *)
 191                         test -n "$quiet" && return;;
 192                 esac
 193                 shift
 194                 printf "%s" "$*"
 195                 tput sgr0
 196                 echo
 197                 )
 198         }
 199 else
 200         say_color() {
 201                 test -z "$1" && test -n "$quiet" && return
 202                 shift
 203                 echo "$*"
 204         }
 205 fi
 206
 207 error () {
 208         say_color error "error: $*"
 209         GIT_EXIT_OK=t
 210         exit 1
 211 }
 212
 213 say () {
 214         say_color info "$*"
 215 }
 216
 217 test "${test_description}" != "" ||
 218 error "Test script did not set test_description."
 219
 220 if test "$help" = "t"
 221 then
 222         echo "$test_description"
 223         exit 0
 224 fi
 225
 226 exec 5>&1
 227 exec 6<&0
 228 if test "$verbose" = "t"
 229 then
 230         exec 4>&2 3>&1
 231 else
 232         exec 4>/dev/null 3>/dev/null
 233 fi
 234
 235 test_failure=0
 236 test_count=0
 237 test_fixed=0
 238 test_broken=0
 239 test_success=0
 240
 241 test_external_has_tap=0
 242
 243 die () {
 244         code=$?
 245         if test -n "$GIT_EXIT_OK"
 246         then
 247                 exit $code
 248         else
 249                 echo >&5 "FATAL: Unexpected exit with code $code"
 250                 exit 1
 251         fi
 252 }
 253
 254 GIT_EXIT_OK=
 255 trap 'die' EXIT
 256
 257 # The user-facing functions are loaded from a separate file so that
 258 # test_perf subshells can have them too
 259 . "$TEST_DIRECTORY/test-lib-functions.sh"
 260
 261 # You are not expected to call test_ok_ and test_failure_ directly, use
 262 # the text_expect_* functions instead.
 263
 264 test_ok_ () {
 265         test_success=$(($test_success + 1))
 266         say_color "" "ok $test_count - $@"
 267 }
 268
 269 test_failure_ () {
 270         test_failure=$(($test_failure + 1))
 271         say_color error "not ok - $test_count $1"
 272         shift
 273         echo "$@" | sed -e 's/^/#       /'
 274         test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
 275 }
 276
 277 test_known_broken_ok_ () {
 278         test_fixed=$(($test_fixed+1))
 279         say_color "" "ok $test_count - $@ # TODO known breakage"
 280 }
 281
 282 test_known_broken_failure_ () {
 283         test_broken=$(($test_broken+1))
 284         say_color skip "not ok $test_count - $@ # TODO known breakage"
 285 }
 286
 287 test_debug () {
 288         test "$debug" = "" || eval "$1"
 289 }
 290
 291 test_eval_ () {
 292         # This is a separate function because some tests use
 293         # "return" to end a test_expect_success block early.
 294         eval </dev/null >&3 2>&4 "$*"
 295 }
 296
 297 test_run_ () {
 298         test_cleanup=:
 299         expecting_failure=$2
 300         test_eval_ "$1"
 301         eval_ret=$?
 302
 303         if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"
 304         then
 305                 test_eval_ "$test_cleanup"
 306         fi
 307         if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"
 308         then
 309                 echo ""
 310         fi
 311         return "$eval_ret"
 312 }
 313
 314 test_skip () {
 315         test_count=$(($test_count+1))
 316         to_skip=
 317         for skp in $GIT_SKIP_TESTS
 318         do
 319                 case $this_test.$test_count in
 320                 $skp)
 321                         to_skip=t
 322                         break
 323                 esac
 324         done
 325         if test -z "$to_skip" && test -n "$test_prereq" &&
 326            ! test_have_prereq "$test_prereq"
 327         then
 328                 to_skip=t
 329         fi
 330         case "$to_skip" in
 331         t)
 332                 of_prereq=
 333                 if test "$missing_prereq" != "$test_prereq"
 334                 then
 335                         of_prereq=" of $test_prereq"
 336                 fi
 337
 338                 say_color skip >&3 "skipping test: $@"
 339                 say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
 340                 : true
 341                 ;;
 342         *)
 343                 false
 344                 ;;
 345         esac
 346 }
 347
 348 # stub; perf-lib overrides it
 349 test_at_end_hook_ () {
 350         :
 351 }
 352
 353 test_done () {
 354         GIT_EXIT_OK=t
 355
 356         if test -z "$HARNESS_ACTIVE"
 357         then
 358                 test_results_dir="$TEST_OUTPUT_DIRECTORY/test-results"
 359                 mkdir -p "$test_results_dir"
 360                 test_results_path="$test_results_dir/${0%.sh}-$$.counts"
 361
 362                 cat >>"$test_results_path" <<-EOF
 363                 total $test_count
 364                 success $test_success
 365                 fixed $test_fixed
 366                 broken $test_broken
 367                 failed $test_failure
 368
 369                 EOF
 370         fi
 371
 372         if test "$test_fixed" != 0
 373         then
 374                 say_color pass "# fixed $test_fixed known breakage(s)"
 375         fi
 376         if test "$test_broken" != 0
 377         then
 378                 say_color error "# still have $test_broken known breakage(s)"
 379                 msg="remaining $(($test_count-$test_broken)) test(s)"
 380         else
 381                 msg="$test_count test(s)"
 382         fi
 383         case "$test_failure" in
 384         0)
 385                 # Maybe print SKIP message
 386                 if test -n "$skip_all" && test $test_count -gt 0
 387                 then
 388                         error "Can't use skip_all after running some tests"
 389                 fi
 390                 [ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
 391
 392                 if test $test_external_has_tap -eq 0
 393                 then
 394                         if test $test_count -gt 0
 395                         then
 396                                 say_color pass "# passed all $msg"
 397                         fi
 398                         say "1..$test_count$skip_all"
 399                 fi
 400
 401                 test -d "$remove_trash" &&
 402                 cd "$(dirname "$remove_trash")" &&
 403                 rm -rf "$(basename "$remove_trash")"
 404
 405                 test_at_end_hook_
 406
 407                 exit 0 ;;
 408
 409         *)
 410                 if test $test_external_has_tap -eq 0
 411                 then
 412                         say_color error "# failed $test_failure among $msg"
 413                         say "1..$test_count"
 414                 fi
 415
 416                 exit 1 ;;
 417
 418         esac
 419 }
 420
 421 if test -n "$valgrind"
 422 then
 423         make_symlink () {
 424                 test -h "$2" &&
 425                 test "$1" = "$(readlink "$2")" || {
 426                         # be super paranoid
 427                         if mkdir "$2".lock
 428                         then
 429                                 rm -f "$2" &&
 430                                 ln -s "$1" "$2" &&
 431                                 rm -r "$2".lock
 432                         else
 433                                 while test -d "$2".lock
 434                                 do
 435                                         say "Waiting for lock on $2."
 436                                         sleep 1
 437                                 done
 438                         fi
 439                 }
 440         }
 441
 442         make_valgrind_symlink () {
 443                 # handle only executables, unless they are shell libraries that
 444                 # need to be in the exec-path.  We will just use "#!" as a
 445                 # guess for a shell-script, since we have no idea what the user
 446                 # may have configured as the shell path.
 447                 test -x "$1" ||
 448                 test "#!" = "$(head -c 2 <"$1")" ||
 449                 return;
 450
 451                 base=$(basename "$1")
 452                 symlink_target=$GIT_BUILD_DIR/$base
 453                 # do not override scripts
 454                 if test -x "$symlink_target" &&
 455                     test ! -d "$symlink_target" &&
 456                     test "#!" != "$(head -c 2 < "$symlink_target")"
 457                 then
 458                         symlink_target=../valgrind.sh
 459                 fi
 460                 case "$base" in
 461                 *.sh|*.perl)
 462                         symlink_target=../unprocessed-script
 463                 esac
 464                 # create the link, or replace it if it is out of date
 465                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
 466         }
 467
 468         # override all git executables in TEST_DIRECTORY/..
 469         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
 470         mkdir -p "$GIT_VALGRIND"/bin
 471         for file in $GIT_BUILD_DIR/git* $GIT_BUILD_DIR/test-*
 472         do
 473                 make_valgrind_symlink $file
 474         done
 475         # special-case the mergetools loadables
 476         make_symlink "$GIT_BUILD_DIR"/mergetools "$GIT_VALGRIND/bin/mergetools"
 477         OLDIFS=$IFS
 478         IFS=:
 479         for path in $PATH
 480         do
 481                 ls "$path"/git-* 2> /dev/null |
 482                 while read file
 483                 do
 484                         make_valgrind_symlink "$file"
 485                 done
 486         done
 487         IFS=$OLDIFS
 488         PATH=$GIT_VALGRIND/bin:$PATH
 489         GIT_EXEC_PATH=$GIT_VALGRIND/bin
 490         export GIT_VALGRIND
 491 elif test -n "$GIT_TEST_INSTALLED"
 492 then
 493         GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
 494         error "Cannot run git from $GIT_TEST_INSTALLED."
 495         PATH=$GIT_TEST_INSTALLED:$GIT_BUILD_DIR:$PATH
 496         GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
 497 else # normal case, use ../bin-wrappers only unless $with_dashes:
 498         git_bin_dir="$GIT_BUILD_DIR/bin-wrappers"
 499         if ! test -x "$git_bin_dir/git"
 500         then
 501                 if test -z "$with_dashes"
 502                 then
 503                         say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
 504                 fi
 505                 with_dashes=t
 506         fi
 507         PATH="$git_bin_dir:$PATH"
 508         GIT_EXEC_PATH=$GIT_BUILD_DIR
 509         if test -n "$with_dashes"
 510         then
 511                 PATH="$GIT_BUILD_DIR:$PATH"
 512         fi
 513 fi
 514 GIT_TEMPLATE_DIR="$GIT_BUILD_DIR"/templates/blt
 515 unset GIT_CONFIG
 516 GIT_CONFIG_NOSYSTEM=1
 517 GIT_ATTR_NOSYSTEM=1
 518 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_ATTR_NOSYSTEM
 519
 520 if test -z "$GIT_TEST_CMP"
 521 then
 522         if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
 523         then
 524                 GIT_TEST_CMP="$DIFF -c"
 525         else
 526                 GIT_TEST_CMP="$DIFF -u"
 527         fi
 528 fi
 529
 530 GITPERLLIB="$GIT_BUILD_DIR"/perl/blib/lib:"$GIT_BUILD_DIR"/perl/blib/arch/auto/Git
 531 export GITPERLLIB
 532 test -d "$GIT_BUILD_DIR"/templates/blt || {
 533         error "You haven't built things yet, have you?"
 534 }
 535
 536 if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
 537 then
 538         GITPYTHONLIB="$GIT_BUILD_DIR/git_remote_helpers/build/lib"
 539         export GITPYTHONLIB
 540         test -d "$GIT_BUILD_DIR"/git_remote_helpers/build || {
 541                 error "You haven't built git_remote_helpers yet, have you?"
 542         }
 543 fi
 544
 545 if ! test -x "$GIT_BUILD_DIR"/test-chmtime
 546 then
 547         echo >&2 'You need to build test-chmtime:'
 548         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
 549         exit 1
 550 fi
 551
 552 # Test repository
 553 test="trash directory.$(basename "$0" .sh)"
 554 test -n "$root" && test="$root/$test"
 555 case "$test" in
 556 /*) TRASH_DIRECTORY="$test" ;;
 557  *) TRASH_DIRECTORY="$TEST_OUTPUT_DIRECTORY/$test" ;;
 558 esac
 559 test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
 560 rm -fr "$test" || {
 561         GIT_EXIT_OK=t
 562         echo >&5 "FATAL: Cannot prepare test area"
 563         exit 1
 564 }
 565
 566 HOME="$TRASH_DIRECTORY"
 567 export HOME
 568
 569 if test -z "$TEST_NO_CREATE_REPO"
 570 then
 571         test_create_repo "$test"
 572 else
 573         mkdir -p "$test"
 574 fi
 575 # Use -P to resolve symlinks in our working directory so that the cwd
 576 # in subprocesses like git equals our $PWD (for pathname comparisons).
 577 cd -P "$test" || exit 1
 578
 579 this_test=${0##*/}
 580 this_test=${this_test%%-*}
 581 for skp in $GIT_SKIP_TESTS
 582 do
 583         case "$this_test" in
 584         $skp)
 585                 say_color skip >&3 "skipping test $this_test altogether"
 586                 skip_all="skip all tests in $this_test"
 587                 test_done
 588         esac
 589 done
 590
 591 # Provide an implementation of the 'yes' utility
 592 yes () {
 593         if test $# = 0
 594         then
 595                 y=y
 596         else
 597                 y="$*"
 598         fi
 599
 600         while echo "$y"
 601         do
 602                 :
 603         done
 604 }
 605
 606 # Fix some commands on Windows
 607 case $(uname -s) in
 608 *MINGW*)
 609         # Windows has its own (incompatible) sort and find
 610         sort () {
 611                 /usr/bin/sort "$@"
 612         }
 613         find () {
 614                 /usr/bin/find "$@"
 615         }
 616         sum () {
 617                 md5sum "$@"
 618         }
 619         # git sees Windows-style pwd
 620         pwd () {
 621                 builtin pwd -W
 622         }
 623         # no POSIX permissions
 624         # backslashes in pathspec are converted to '/'
 625         # exec does not inherit the PID
 626         test_set_prereq MINGW
 627         test_set_prereq SED_STRIPS_CR
 628         ;;
 629 *CYGWIN*)
 630         test_set_prereq POSIXPERM
 631         test_set_prereq EXECKEEPSPID
 632         test_set_prereq NOT_MINGW
 633         test_set_prereq SED_STRIPS_CR
 634         ;;
 635 *)
 636         test_set_prereq POSIXPERM
 637         test_set_prereq BSLASHPSPEC
 638         test_set_prereq EXECKEEPSPID
 639         test_set_prereq NOT_MINGW
 640         ;;
 641 esac
 642
 643 ( COLUMNS=1 && test $COLUMNS = 1 ) && test_set_prereq COLUMNS_CAN_BE_1
 644 test -z "$NO_PERL" && test_set_prereq PERL
 645 test -z "$NO_PYTHON" && test_set_prereq PYTHON
 646 test -n "$USE_LIBPCRE" && test_set_prereq LIBPCRE
 647 test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
 648
 649 # Can we rely on git's output in the C locale?
 650 if test -n "$GETTEXT_POISON"
 651 then
 652         GIT_GETTEXT_POISON=YesPlease
 653         export GIT_GETTEXT_POISON
 654         test_set_prereq GETTEXT_POISON
 655 else
 656         test_set_prereq C_LOCALE_OUTPUT
 657 fi
 658
 659 # Use this instead of test_cmp to compare files that contain expected and
 660 # actual output from git commands that can be translated.  When running
 661 # under GETTEXT_POISON this pretends that the command produced expected
 662 # results.
 663 test_i18ncmp () {
 664         test -n "$GETTEXT_POISON" || test_cmp "$@"
 665 }
 666
 667 # Use this instead of "grep expected-string actual" to see if the
 668 # output from a git command that can be translated either contains an
 669 # expected string, or does not contain an unwanted one.  When running
 670 # under GETTEXT_POISON this pretends that the command produced expected
 671 # results.
 672 test_i18ngrep () {
 673         if test -n "$GETTEXT_POISON"
 674         then
 675             : # pretend success
 676         elif test "x!" = "x$1"
 677         then
 678                 shift
 679                 ! grep "$@"
 680         else
 681                 grep "$@"
 682         fi
 683 }
 684
 685 # test whether the filesystem supports symbolic links
 686 ln -s x y 2>/dev/null && test -h y 2>/dev/null && test_set_prereq SYMLINKS
 687 rm -f y
 688
 689 # When the tests are run as root, permission tests will report that
 690 # things are writable when they shouldn't be.
 691 test -w / || test_set_prereq SANITY