Merge branch 'jn/glossary-revision'
[git] / 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 # Keep the original TERM for say_color
19 ORIGINAL_TERM=$TERM
20
21 # Test the binaries we have just built.  The tests are kept in
22 # t/ subdirectory and are run in 'trash directory' subdirectory.
23 if test -z "$TEST_DIRECTORY"
24 then
25         # We allow tests to override this, in case they want to run tests
26         # outside of t/, e.g. for running tests on the test library
27         # itself.
28         TEST_DIRECTORY=$(pwd)
29 fi
30 if test -z "$TEST_OUTPUT_DIRECTORY"
31 then
32         # Similarly, override this to store the test-results subdir
33         # elsewhere
34         TEST_OUTPUT_DIRECTORY=$TEST_DIRECTORY
35 fi
36 GIT_BUILD_DIR="$TEST_DIRECTORY"/..
37
38 ################################################################
39 # It appears that people try to run tests without building...
40 "$GIT_BUILD_DIR/git" >/dev/null
41 if test $? != 1
42 then
43         echo >&2 'error: you do not seem to have built git yet.'
44         exit 1
45 fi
46
47 . "$GIT_BUILD_DIR"/GIT-BUILD-OPTIONS
48 export PERL_PATH SHELL_PATH
49
50 # if --tee was passed, write the output not only to the terminal, but
51 # additionally to the file test-results/$BASENAME.out, too.
52 case "$GIT_TEST_TEE_STARTED, $* " in
53 done,*)
54         # do not redirect again
55         ;;
56 *' --tee '*|*' --va'*)
57         mkdir -p test-results
58         BASE=test-results/$(basename "$0" .sh)
59         (GIT_TEST_TEE_STARTED=done ${SHELL_PATH} "$0" "$@" 2>&1;
60          echo $? > $BASE.exit) | tee $BASE.out
61         test "$(cat $BASE.exit)" = 0
62         exit
63         ;;
64 esac
65
66 # For repeatability, reset the environment to known value.
67 LANG=C
68 LC_ALL=C
69 PAGER=cat
70 TZ=UTC
71 TERM=dumb
72 export LANG LC_ALL PAGER TERM TZ
73 EDITOR=:
74 # A call to "unset" with no arguments causes at least Solaris 10
75 # /usr/xpg4/bin/sh and /bin/ksh to bail out.  So keep the unsets
76 # deriving from the command substitution clustered with the other
77 # ones.
78 unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
79         my @env = keys %ENV;
80         my $ok = join("|", qw(
81                 TRACE
82                 DEBUG
83                 USE_LOOKUP
84                 TEST
85                 .*_TEST
86                 PROVE
87                 VALGRIND
88                 UNZIP
89                 PERF_
90         ));
91         my @vars = grep(/^GIT_/ && !/^GIT_($ok)/o, @env);
92         print join("\n", @vars);
93 ')
94 unset XDG_CONFIG_HOME
95 GIT_AUTHOR_EMAIL=author@example.com
96 GIT_AUTHOR_NAME='A U Thor'
97 GIT_COMMITTER_EMAIL=committer@example.com
98 GIT_COMMITTER_NAME='C O Mitter'
99 GIT_MERGE_VERBOSITY=5
100 GIT_MERGE_AUTOEDIT=no
101 export GIT_MERGE_VERBOSITY GIT_MERGE_AUTOEDIT
102 export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME
103 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME
104 export EDITOR
105
106 # Add libc MALLOC and MALLOC_PERTURB test
107 # only if we are not executing the test with valgrind
108 if expr " $GIT_TEST_OPTS " : ".* --valgrind " >/dev/null ||
109    test -n "$TEST_NO_MALLOC_CHECK"
110 then
111         setup_malloc_check () {
112                 : nothing
113         }
114         teardown_malloc_check () {
115                 : nothing
116         }
117 else
118         setup_malloc_check () {
119                 MALLOC_CHECK_=3 MALLOC_PERTURB_=165
120                 export MALLOC_CHECK_ MALLOC_PERTURB_
121         }
122         teardown_malloc_check () {
123                 unset MALLOC_CHECK_ MALLOC_PERTURB_
124         }
125 fi
126
127 # Protect ourselves from common misconfiguration to export
128 # CDPATH into the environment
129 unset CDPATH
130
131 unset GREP_OPTIONS
132 unset UNZIP
133
134 case $(echo $GIT_TRACE |tr "[A-Z]" "[a-z]") in
135 1|2|true)
136         echo "* warning: Some tests will not work if GIT_TRACE" \
137                 "is set as to trace on STDERR ! *"
138         echo "* warning: Please set GIT_TRACE to something" \
139                 "other than 1, 2 or true ! *"
140         ;;
141 esac
142
143 # Convenience
144 #
145 # A regexp to match 5 and 40 hexdigits
146 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
147 _x40="$_x05$_x05$_x05$_x05$_x05$_x05$_x05$_x05"
148
149 # Zero SHA-1
150 _z40=0000000000000000000000000000000000000000
151
152 # Line feed
153 LF='
154 '
155
156 export _x05 _x40 _z40 LF
157
158 # Each test should start with something like this, after copyright notices:
159 #
160 # test_description='Description of this test...
161 # This test checks if command xyzzy does the right thing...
162 # '
163 # . ./test-lib.sh
164 [ "x$ORIGINAL_TERM" != "xdumb" ] && (
165                 TERM=$ORIGINAL_TERM &&
166                 export TERM &&
167                 [ -t 1 ] &&
168                 tput bold >/dev/null 2>&1 &&
169                 tput setaf 1 >/dev/null 2>&1 &&
170                 tput sgr0 >/dev/null 2>&1
171         ) &&
172         color=t
173
174 while test "$#" -ne 0
175 do
176         case "$1" in
177         -d|--d|--de|--deb|--debu|--debug)
178                 debug=t; shift ;;
179         -i|--i|--im|--imm|--imme|--immed|--immedi|--immedia|--immediat|--immediate)
180                 immediate=t; shift ;;
181         -l|--l|--lo|--lon|--long|--long-|--long-t|--long-te|--long-tes|--long-test|--long-tests)
182                 GIT_TEST_LONG=t; export GIT_TEST_LONG; shift ;;
183         -h|--h|--he|--hel|--help)
184                 help=t; shift ;;
185         -v|--v|--ve|--ver|--verb|--verbo|--verbos|--verbose)
186                 verbose=t; shift ;;
187         -q|--q|--qu|--qui|--quie|--quiet)
188                 # Ignore --quiet under a TAP::Harness. Saying how many tests
189                 # passed without the ok/not ok details is always an error.
190                 test -z "$HARNESS_ACTIVE" && quiet=t; shift ;;
191         --with-dashes)
192                 with_dashes=t; shift ;;
193         --no-color)
194                 color=; shift ;;
195         --va|--val|--valg|--valgr|--valgri|--valgrin|--valgrind)
196                 valgrind=memcheck
197                 shift ;;
198         --valgrind=*)
199                 valgrind=$(expr "z$1" : 'z[^=]*=\(.*\)')
200                 shift ;;
201         --tee)
202                 shift ;; # was handled already
203         --root=*)
204                 root=$(expr "z$1" : 'z[^=]*=\(.*\)')
205                 shift ;;
206         *)
207                 echo "error: unknown test option '$1'" >&2; exit 1 ;;
208         esac
209 done
210
211 test -n "$valgrind" && verbose=t
212
213 if test -n "$color"
214 then
215         say_color () {
216                 (
217                 TERM=$ORIGINAL_TERM
218                 export TERM
219                 case "$1" in
220                 error)
221                         tput bold; tput setaf 1;; # bold red
222                 skip)
223                         tput setaf 4;; # blue
224                 warn)
225                         tput setaf 3;; # brown/yellow
226                 pass)
227                         tput setaf 2;; # green
228                 info)
229                         tput setaf 6;; # cyan
230                 *)
231                         test -n "$quiet" && return;;
232                 esac
233                 shift
234                 printf "%s" "$*"
235                 tput sgr0
236                 echo
237                 )
238         }
239 else
240         say_color() {
241                 test -z "$1" && test -n "$quiet" && return
242                 shift
243                 printf "%s\n" "$*"
244         }
245 fi
246
247 error () {
248         say_color error "error: $*"
249         GIT_EXIT_OK=t
250         exit 1
251 }
252
253 say () {
254         say_color info "$*"
255 }
256
257 test "${test_description}" != "" ||
258 error "Test script did not set test_description."
259
260 if test "$help" = "t"
261 then
262         echo "$test_description"
263         exit 0
264 fi
265
266 exec 5>&1
267 exec 6<&0
268 if test "$verbose" = "t"
269 then
270         exec 4>&2 3>&1
271 else
272         exec 4>/dev/null 3>/dev/null
273 fi
274
275 test_failure=0
276 test_count=0
277 test_fixed=0
278 test_broken=0
279 test_success=0
280
281 test_external_has_tap=0
282
283 die () {
284         code=$?
285         if test -n "$GIT_EXIT_OK"
286         then
287                 exit $code
288         else
289                 echo >&5 "FATAL: Unexpected exit with code $code"
290                 exit 1
291         fi
292 }
293
294 GIT_EXIT_OK=
295 trap 'die' EXIT
296
297 # The user-facing functions are loaded from a separate file so that
298 # test_perf subshells can have them too
299 . "$TEST_DIRECTORY/test-lib-functions.sh"
300
301 # You are not expected to call test_ok_ and test_failure_ directly, use
302 # the text_expect_* functions instead.
303
304 test_ok_ () {
305         test_success=$(($test_success + 1))
306         say_color "" "ok $test_count - $@"
307 }
308
309 test_failure_ () {
310         test_failure=$(($test_failure + 1))
311         say_color error "not ok $test_count - $1"
312         shift
313         echo "$@" | sed -e 's/^/#       /'
314         test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
315 }
316
317 test_known_broken_ok_ () {
318         test_fixed=$(($test_fixed+1))
319         say_color error "ok $test_count - $@ # TODO known breakage vanished"
320 }
321
322 test_known_broken_failure_ () {
323         test_broken=$(($test_broken+1))
324         say_color warn "not ok $test_count - $@ # TODO known breakage"
325 }
326
327 test_debug () {
328         test "$debug" = "" || eval "$1"
329 }
330
331 test_eval_ () {
332         # This is a separate function because some tests use
333         # "return" to end a test_expect_success block early.
334         eval </dev/null >&3 2>&4 "$*"
335 }
336
337 test_run_ () {
338         test_cleanup=:
339         expecting_failure=$2
340         test_eval_ "$1"
341         eval_ret=$?
342
343         if test -z "$immediate" || test $eval_ret = 0 || test -n "$expecting_failure"
344         then
345                 setup_malloc_check
346                 test_eval_ "$test_cleanup"
347                 teardown_malloc_check
348         fi
349         if test "$verbose" = "t" && test -n "$HARNESS_ACTIVE"
350         then
351                 echo ""
352         fi
353         return "$eval_ret"
354 }
355
356 test_skip () {
357         test_count=$(($test_count+1))
358         to_skip=
359         for skp in $GIT_SKIP_TESTS
360         do
361                 case $this_test.$test_count in
362                 $skp)
363                         to_skip=t
364                         break
365                 esac
366         done
367         if test -z "$to_skip" && test -n "$test_prereq" &&
368            ! test_have_prereq "$test_prereq"
369         then
370                 to_skip=t
371         fi
372         case "$to_skip" in
373         t)
374                 of_prereq=
375                 if test "$missing_prereq" != "$test_prereq"
376                 then
377                         of_prereq=" of $test_prereq"
378                 fi
379
380                 say_color skip >&3 "skipping test: $@"
381                 say_color skip "ok $test_count # skip $1 (missing $missing_prereq${of_prereq})"
382                 : true
383                 ;;
384         *)
385                 false
386                 ;;
387         esac
388 }
389
390 # stub; perf-lib overrides it
391 test_at_end_hook_ () {
392         :
393 }
394
395 test_done () {
396         GIT_EXIT_OK=t
397
398         if test -z "$HARNESS_ACTIVE"
399         then
400                 test_results_dir="$TEST_OUTPUT_DIRECTORY/test-results"
401                 mkdir -p "$test_results_dir"
402                 base=${0##*/}
403                 test_results_path="$test_results_dir/${base%.sh}-$$.counts"
404
405                 cat >>"$test_results_path" <<-EOF
406                 total $test_count
407                 success $test_success
408                 fixed $test_fixed
409                 broken $test_broken
410                 failed $test_failure
411
412                 EOF
413         fi
414
415         if test "$test_fixed" != 0
416         then
417                 say_color error "# $test_fixed known breakage(s) vanished; please update test(s)"
418         fi
419         if test "$test_broken" != 0
420         then
421                 say_color warn "# still have $test_broken known breakage(s)"
422         fi
423         if test "$test_broken" != 0 || test "$test_fixed" != 0
424         then
425                 test_remaining=$(( $test_count - $test_broken - $test_fixed ))
426                 msg="remaining $test_remaining test(s)"
427         else
428                 test_remaining=$test_count
429                 msg="$test_count test(s)"
430         fi
431         case "$test_failure" in
432         0)
433                 # Maybe print SKIP message
434                 if test -n "$skip_all" && test $test_count -gt 0
435                 then
436                         error "Can't use skip_all after running some tests"
437                 fi
438                 [ -z "$skip_all" ] || skip_all=" # SKIP $skip_all"
439
440                 if test $test_external_has_tap -eq 0
441                 then
442                         if test $test_remaining -gt 0
443                         then
444                                 say_color pass "# passed all $msg"
445                         fi
446                         say "1..$test_count$skip_all"
447                 fi
448
449                 test -d "$remove_trash" &&
450                 cd "$(dirname "$remove_trash")" &&
451                 rm -rf "$(basename "$remove_trash")"
452
453                 test_at_end_hook_
454
455                 exit 0 ;;
456
457         *)
458                 if test $test_external_has_tap -eq 0
459                 then
460                         say_color error "# failed $test_failure among $msg"
461                         say "1..$test_count"
462                 fi
463
464                 exit 1 ;;
465
466         esac
467 }
468
469 if test -n "$valgrind"
470 then
471         make_symlink () {
472                 test -h "$2" &&
473                 test "$1" = "$(readlink "$2")" || {
474                         # be super paranoid
475                         if mkdir "$2".lock
476                         then
477                                 rm -f "$2" &&
478                                 ln -s "$1" "$2" &&
479                                 rm -r "$2".lock
480                         else
481                                 while test -d "$2".lock
482                                 do
483                                         say "Waiting for lock on $2."
484                                         sleep 1
485                                 done
486                         fi
487                 }
488         }
489
490         make_valgrind_symlink () {
491                 # handle only executables, unless they are shell libraries that
492                 # need to be in the exec-path.  We will just use "#!" as a
493                 # guess for a shell-script, since we have no idea what the user
494                 # may have configured as the shell path.
495                 test -x "$1" ||
496                 test "#!" = "$(head -c 2 <"$1")" ||
497                 return;
498
499                 base=$(basename "$1")
500                 symlink_target=$GIT_BUILD_DIR/$base
501                 # do not override scripts
502                 if test -x "$symlink_target" &&
503                     test ! -d "$symlink_target" &&
504                     test "#!" != "$(head -c 2 < "$symlink_target")"
505                 then
506                         symlink_target=../valgrind.sh
507                 fi
508                 case "$base" in
509                 *.sh|*.perl)
510                         symlink_target=../unprocessed-script
511                 esac
512                 # create the link, or replace it if it is out of date
513                 make_symlink "$symlink_target" "$GIT_VALGRIND/bin/$base" || exit
514         }
515
516         # override all git executables in TEST_DIRECTORY/..
517         GIT_VALGRIND=$TEST_DIRECTORY/valgrind
518         mkdir -p "$GIT_VALGRIND"/bin
519         for file in $GIT_BUILD_DIR/git* $GIT_BUILD_DIR/test-*
520         do
521                 make_valgrind_symlink $file
522         done
523         # special-case the mergetools loadables
524         make_symlink "$GIT_BUILD_DIR"/mergetools "$GIT_VALGRIND/bin/mergetools"
525         OLDIFS=$IFS
526         IFS=:
527         for path in $PATH
528         do
529                 ls "$path"/git-* 2> /dev/null |
530                 while read file
531                 do
532                         make_valgrind_symlink "$file"
533                 done
534         done
535         IFS=$OLDIFS
536         PATH=$GIT_VALGRIND/bin:$PATH
537         GIT_EXEC_PATH=$GIT_VALGRIND/bin
538         export GIT_VALGRIND
539         GIT_VALGRIND_MODE="$valgrind"
540         export GIT_VALGRIND_MODE
541 elif test -n "$GIT_TEST_INSTALLED"
542 then
543         GIT_EXEC_PATH=$($GIT_TEST_INSTALLED/git --exec-path)  ||
544         error "Cannot run git from $GIT_TEST_INSTALLED."
545         PATH=$GIT_TEST_INSTALLED:$GIT_BUILD_DIR:$PATH
546         GIT_EXEC_PATH=${GIT_TEST_EXEC_PATH:-$GIT_EXEC_PATH}
547 else # normal case, use ../bin-wrappers only unless $with_dashes:
548         git_bin_dir="$GIT_BUILD_DIR/bin-wrappers"
549         if ! test -x "$git_bin_dir/git"
550         then
551                 if test -z "$with_dashes"
552                 then
553                         say "$git_bin_dir/git is not executable; using GIT_EXEC_PATH"
554                 fi
555                 with_dashes=t
556         fi
557         PATH="$git_bin_dir:$PATH"
558         GIT_EXEC_PATH=$GIT_BUILD_DIR
559         if test -n "$with_dashes"
560         then
561                 PATH="$GIT_BUILD_DIR:$PATH"
562         fi
563 fi
564 GIT_TEMPLATE_DIR="$GIT_BUILD_DIR"/templates/blt
565 unset GIT_CONFIG
566 GIT_CONFIG_NOSYSTEM=1
567 GIT_ATTR_NOSYSTEM=1
568 export PATH GIT_EXEC_PATH GIT_TEMPLATE_DIR GIT_CONFIG_NOSYSTEM GIT_ATTR_NOSYSTEM
569
570 if test -z "$GIT_TEST_CMP"
571 then
572         if test -n "$GIT_TEST_CMP_USE_COPIED_CONTEXT"
573         then
574                 GIT_TEST_CMP="$DIFF -c"
575         else
576                 GIT_TEST_CMP="$DIFF -u"
577         fi
578 fi
579
580 GITPERLLIB="$GIT_BUILD_DIR"/perl/blib/lib:"$GIT_BUILD_DIR"/perl/blib/arch/auto/Git
581 export GITPERLLIB
582 test -d "$GIT_BUILD_DIR"/templates/blt || {
583         error "You haven't built things yet, have you?"
584 }
585
586 if test -z "$GIT_TEST_INSTALLED" && test -z "$NO_PYTHON"
587 then
588         GITPYTHONLIB="$GIT_BUILD_DIR/git_remote_helpers/build/lib"
589         export GITPYTHONLIB
590         test -d "$GIT_BUILD_DIR"/git_remote_helpers/build || {
591                 error "You haven't built git_remote_helpers yet, have you?"
592         }
593 fi
594
595 if ! test -x "$GIT_BUILD_DIR"/test-chmtime
596 then
597         echo >&2 'You need to build test-chmtime:'
598         echo >&2 'Run "make test-chmtime" in the source (toplevel) directory'
599         exit 1
600 fi
601
602 # Test repository
603 TRASH_DIRECTORY="trash directory.$(basename "$0" .sh)"
604 test -n "$root" && TRASH_DIRECTORY="$root/$TRASH_DIRECTORY"
605 case "$TRASH_DIRECTORY" in
606 /*) ;; # absolute path is good
607  *) TRASH_DIRECTORY="$TEST_OUTPUT_DIRECTORY/$TRASH_DIRECTORY" ;;
608 esac
609 test ! -z "$debug" || remove_trash=$TRASH_DIRECTORY
610 rm -fr "$TRASH_DIRECTORY" || {
611         GIT_EXIT_OK=t
612         echo >&5 "FATAL: Cannot prepare test area"
613         exit 1
614 }
615
616 HOME="$TRASH_DIRECTORY"
617 export HOME
618
619 if test -z "$TEST_NO_CREATE_REPO"
620 then
621         test_create_repo "$TRASH_DIRECTORY"
622 else
623         mkdir -p "$TRASH_DIRECTORY"
624 fi
625 # Use -P to resolve symlinks in our working directory so that the cwd
626 # in subprocesses like git equals our $PWD (for pathname comparisons).
627 cd -P "$TRASH_DIRECTORY" || exit 1
628
629 this_test=${0##*/}
630 this_test=${this_test%%-*}
631 for skp in $GIT_SKIP_TESTS
632 do
633         case "$this_test" in
634         $skp)
635                 say_color info >&3 "skipping test $this_test altogether"
636                 skip_all="skip all tests in $this_test"
637                 test_done
638         esac
639 done
640
641 # Provide an implementation of the 'yes' utility
642 yes () {
643         if test $# = 0
644         then
645                 y=y
646         else
647                 y="$*"
648         fi
649
650         while echo "$y"
651         do
652                 :
653         done
654 }
655
656 # Fix some commands on Windows
657 case $(uname -s) in
658 *MINGW*)
659         # Windows has its own (incompatible) sort and find
660         sort () {
661                 /usr/bin/sort "$@"
662         }
663         find () {
664                 /usr/bin/find "$@"
665         }
666         sum () {
667                 md5sum "$@"
668         }
669         # git sees Windows-style pwd
670         pwd () {
671                 builtin pwd -W
672         }
673         # no POSIX permissions
674         # backslashes in pathspec are converted to '/'
675         # exec does not inherit the PID
676         test_set_prereq MINGW
677         test_set_prereq NOT_CYGWIN
678         test_set_prereq SED_STRIPS_CR
679         ;;
680 *CYGWIN*)
681         test_set_prereq POSIXPERM
682         test_set_prereq EXECKEEPSPID
683         test_set_prereq NOT_MINGW
684         test_set_prereq CYGWIN
685         test_set_prereq SED_STRIPS_CR
686         ;;
687 *)
688         test_set_prereq POSIXPERM
689         test_set_prereq BSLASHPSPEC
690         test_set_prereq EXECKEEPSPID
691         test_set_prereq NOT_MINGW
692         test_set_prereq NOT_CYGWIN
693         ;;
694 esac
695
696 ( COLUMNS=1 && test $COLUMNS = 1 ) && test_set_prereq COLUMNS_CAN_BE_1
697 test -z "$NO_PERL" && test_set_prereq PERL
698 test -z "$NO_PYTHON" && test_set_prereq PYTHON
699 test -n "$USE_LIBPCRE" && test_set_prereq LIBPCRE
700 test -z "$NO_GETTEXT" && test_set_prereq GETTEXT
701
702 # Can we rely on git's output in the C locale?
703 if test -n "$GETTEXT_POISON"
704 then
705         GIT_GETTEXT_POISON=YesPlease
706         export GIT_GETTEXT_POISON
707         test_set_prereq GETTEXT_POISON
708 else
709         test_set_prereq C_LOCALE_OUTPUT
710 fi
711
712 # Use this instead of test_cmp to compare files that contain expected and
713 # actual output from git commands that can be translated.  When running
714 # under GETTEXT_POISON this pretends that the command produced expected
715 # results.
716 test_i18ncmp () {
717         test -n "$GETTEXT_POISON" || test_cmp "$@"
718 }
719
720 # Use this instead of "grep expected-string actual" to see if the
721 # output from a git command that can be translated either contains an
722 # expected string, or does not contain an unwanted one.  When running
723 # under GETTEXT_POISON this pretends that the command produced expected
724 # results.
725 test_i18ngrep () {
726         if test -n "$GETTEXT_POISON"
727         then
728             : # pretend success
729         elif test "x!" = "x$1"
730         then
731                 shift
732                 ! grep "$@"
733         else
734                 grep "$@"
735         fi
736 }
737
738 test_lazy_prereq PIPE '
739         # test whether the filesystem supports FIFOs
740         rm -f testfifo && mkfifo testfifo
741 '
742
743 test_lazy_prereq SYMLINKS '
744         # test whether the filesystem supports symbolic links
745         ln -s x y && test -h y
746 '
747
748 test_lazy_prereq CASE_INSENSITIVE_FS '
749         echo good >CamelCase &&
750         echo bad >camelcase &&
751         test "$(cat CamelCase)" != good
752 '
753
754 test_lazy_prereq UTF8_NFD_TO_NFC '
755         # check whether FS converts nfd unicode to nfc
756         auml=$(printf "\303\244")
757         aumlcdiar=$(printf "\141\314\210")
758         >"$auml" &&
759         case "$(echo *)" in
760         "$aumlcdiar")
761                 true ;;
762         *)
763                 false ;;
764         esac
765 '
766
767 test_lazy_prereq AUTOIDENT '
768         sane_unset GIT_AUTHOR_NAME &&
769         sane_unset GIT_AUTHOR_EMAIL &&
770         git var GIT_AUTHOR_IDENT
771 '
772
773 # When the tests are run as root, permission tests will report that
774 # things are writable when they shouldn't be.
775 test -w / || test_set_prereq SANITY
776
777 GIT_UNZIP=${GIT_UNZIP:-unzip}
778 test_lazy_prereq UNZIP '
779         "$GIT_UNZIP" -v
780         test $? -ne 127
781 '