summaryrefslogtreecommitdiff
path: root/tests/init.sh
blob: bd2048e22d66d7bf6d19e0082ec7898f519803f8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
# source this file; set up for tests

# Copyright (C) 2009-2013 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Using this file in a test
# =========================
#
# The typical skeleton of a test looks like this:
#
#   #!/bin/sh
#   . "${srcdir=.}/init.sh"; path_prepend_ .
#   Execute some commands.
#   Note that these commands are executed in a subdirectory, therefore you
#   need to prepend "../" to relative filenames in the build directory.
#   Note that the "path_prepend_ ." is useful only if the body of your
#   test invokes programs residing in the initial directory.
#   For example, if the programs you want to test are in src/, and this test
#   script is named tests/test-1, then you would use "path_prepend_ ../src",
#   or perhaps export PATH='$(abs_top_builddir)/src$(PATH_SEPARATOR)'"$$PATH"
#   to all tests via automake's TESTS_ENVIRONMENT.
#   Set the exit code 0 for success, 77 for skipped, or 1 or other for failure.
#   Use the skip_ and fail_ functions to print a diagnostic and then exit
#   with the corresponding exit code.
#   Exit $?

# Executing a test that uses this file
# ====================================
#
# Running a single test:
#   $ make check TESTS=test-foo.sh
#
# Running a single test, with verbose output:
#   $ make check TESTS=test-foo.sh VERBOSE=yes
#
# Running a single test, with single-stepping:
#   1. Go into a sub-shell:
#   $ bash
#   2. Set relevant environment variables from TESTS_ENVIRONMENT in the
#      Makefile:
#   $ export srcdir=../../tests # this is an example
#   3. Execute the commands from the test, copy&pasting them one by one:
#   $ . "$srcdir/init.sh"; path_prepend_ .
#   ...
#   4. Finally
#   $ exit

ME_=`expr "./$0" : '.*/\(.*\)$'`

# We use a trap below for cleanup.  This requires us to go through
# hoops to get the right exit status transported through the handler.
# So use 'Exit STATUS' instead of 'exit STATUS' inside of the tests.
# Turn off errexit here so that we don't trip the bug with OSF1/Tru64
# sh inside this function.
Exit () { set +e; (exit $1); exit $1; }

# Print warnings (e.g., about skipped and failed tests) to this file number.
# Override by defining to say, 9, in init.cfg, and putting say,
#   export ...ENVVAR_SETTINGS...; $(SHELL) 9>&2
# in the definition of TESTS_ENVIRONMENT in your tests/Makefile.am file.
# This is useful when using automake's parallel tests mode, to print
# the reason for skip/failure to console, rather than to the .log files.
: ${stderr_fileno_=2}

# Note that correct expansion of "$*" depends on IFS starting with ' '.
# Always write the full diagnostic to stderr.
# When stderr_fileno_ is not 2, also emit the first line of the
# diagnostic to that file descriptor.
warn_ ()
{
  # If IFS does not start with ' ', set it and emit the warning in a subshell.
  case $IFS in
    ' '*) printf '%s\n' "$*" >&2
          test $stderr_fileno_ = 2 \
            || { printf '%s\n' "$*" | sed 1q >&$stderr_fileno_ ; } ;;
    *) (IFS=' '; warn_ "$@");;
  esac
}
fail_ () { warn_ "$ME_: failed test: $@"; Exit 1; }
skip_ () { warn_ "$ME_: skipped test: $@"; Exit 77; }
fatal_ () { warn_ "$ME_: hard error: $@"; Exit 99; }
framework_failure_ () { warn_ "$ME_: set-up failure: $@"; Exit 99; }

# Sanitize this shell to POSIX mode, if possible.
DUALCASE=1; export DUALCASE
if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
  emulate sh
  NULLCMD=:
  alias -g '${1+"$@"}'='"$@"'
  setopt NO_GLOB_SUBST
else
  case `(set -o) 2>/dev/null` in
    *posix*) set -o posix ;;
  esac
fi

# We require $(...) support unconditionally.
# We require a few additional shell features only when $EXEEXT is nonempty,
# in order to support automatic $EXEEXT emulation:
# - hyphen-containing alias names
# - we prefer to use ${var#...} substitution, rather than having
#   to work around lack of support for that feature.
# The following code attempts to find a shell with support for these features.
# If the current shell passes the test, we're done.  Otherwise, test other
# shells until we find one that passes.  If one is found, re-exec it.
# If no acceptable shell is found, skip the current test.
#
# The "...set -x; P=1 true 2>err..." test is to disqualify any shell that
# emits "P=1" into err, as /bin/sh from SunOS 5.11 and OpenBSD 4.7 do.
#
# Use "9" to indicate success (rather than 0), in case some shell acts
# like Solaris 10's /bin/sh but exits successfully instead of with status 2.

# Eval this code in a subshell to determine a shell's suitability.
# 10 - passes all tests; ok to use
#  9 - ok, but enabling "set -x" corrupts app stderr; prefer higher score
#  ? - not ok
gl_shell_test_script_='
test $(echo y) = y || exit 1
score_=10
if test "$VERBOSE" = yes; then
  test -n "$( (exec 3>&1; set -x; P=1 true 2>&3) 2> /dev/null)" && score_=9
fi
test -z "$EXEEXT" && exit $score_
shopt -s expand_aliases
alias a-b="echo zoo"
v=abx
     test ${v%x} = ab \
  && test ${v#a} = bx \
  && test $(a-b) = zoo \
  && exit $score_
'

if test "x$1" = "x--no-reexec"; then
  shift
else
  # Assume a working shell.  Export to subshells (setup_ needs this).
  gl_set_x_corrupts_stderr_=false
  export gl_set_x_corrupts_stderr_

  # Record the first marginally acceptable shell.
  marginal_=

  # Search for a shell that meets our requirements.
  for re_shell_ in __current__ "${CONFIG_SHELL:-no_shell}" \
      /bin/sh bash dash zsh pdksh fail
  do
    test "$re_shell_" = no_shell && continue

    # If we've made it all the way to the sentinel, "fail" without
    # finding even a marginal shell, skip this test.
    if test "$re_shell_" = fail; then
      test -z "$marginal_" && skip_ failed to find an adequate shell
      re_shell_=$marginal_
      break
    fi

    # When testing the current shell, simply "eval" the test code.
    # Otherwise, run it via $re_shell_ -c ...
    if test "$re_shell_" = __current__; then
      # 'eval'ing this code makes Solaris 10's /bin/sh exit with
      # $? set to 2.  It does not evaluate any of the code after the
      # "unexpected" first '('.  Thus, we must run it in a subshell.
      ( eval "$gl_shell_test_script_" ) > /dev/null 2>&1
    else
      "$re_shell_" -c "$gl_shell_test_script_" 2>/dev/null
    fi

    st_=$?

    # $re_shell_ works just fine.  Use it.
    if test $st_ = 10; then
      gl_set_x_corrupts_stderr_=false
      break
    fi

    # If this is our first marginally acceptable shell, remember it.
    if test "$st_:$marginal_" = 9: ; then
      marginal_="$re_shell_"
      gl_set_x_corrupts_stderr_=true
    fi
  done

  if test "$re_shell_" != __current__; then
    # Found a usable shell.  Preserve -v and -x.
    case $- in
      *v*x* | *x*v*) opts_=-vx ;;
      *v*) opts_=-v ;;
      *x*) opts_=-x ;;
      *) opts_= ;;
    esac
    exec "$re_shell_" $opts_ "$0" --no-reexec "$@"
    echo "$ME_: exec failed" 1>&2
    exit 127
  fi
fi

# If this is bash, turn off all aliases.
test -n "$BASH_VERSION" && unalias -a

# Note that when supporting $EXEEXT (transparently mapping from PROG_NAME to
# PROG_NAME.exe), we want to support hyphen-containing names like test-acos.
# That is part of the shell-selection test above.  Why use aliases rather
# than functions?  Because support for hyphen-containing aliases is more
# widespread than that for hyphen-containing function names.
test -n "$EXEEXT" && shopt -s expand_aliases

# Enable glibc's malloc-perturbing option.
# This is useful for exposing code that depends on the fact that
# malloc-related functions often return memory that is mostly zeroed.
# If you have the time and cycles, use valgrind to do an even better job.
: ${MALLOC_PERTURB_=87}
export MALLOC_PERTURB_

# This is a stub function that is run upon trap (upon regular exit and
# interrupt).  Override it with a per-test function, e.g., to unmount
# a partition, or to undo any other global state changes.
cleanup_ () { :; }

# Emit a header similar to that from diff -u;  Print the simulated "diff"
# command so that the order of arguments is clear.  Don't bother with @@ lines.
emit_diff_u_header_ ()
{
  printf '%s\n' "diff -u $*" \
    "--- $1	1970-01-01" \
    "+++ $2	1970-01-01"
}

# Arrange not to let diff or cmp operate on /dev/null,
# since on some systems (at least OSF/1 5.1), that doesn't work.
# When there are not two arguments, or no argument is /dev/null, return 2.
# When one argument is /dev/null and the other is not empty,
# cat the nonempty file to stderr and return 1.
# Otherwise, return 0.
compare_dev_null_ ()
{
  test $# = 2 || return 2

  if test "x$1" = x/dev/null; then
    test -s "$2" || return 0
    emit_diff_u_header_ "$@"; sed 's/^/+/' "$2"
    return 1
  fi

  if test "x$2" = x/dev/null; then
    test -s "$1" || return 0
    emit_diff_u_header_ "$@"; sed 's/^/-/' "$1"
    return 1
  fi

  return 2
}

if diff_out_=`exec 2>/dev/null; diff -u "$0" "$0" < /dev/null` \
   && diff -u Makefile "$0" 2>/dev/null | grep '^[+]#!' >/dev/null; then
  # diff accepts the -u option and does not (like AIX 7 'diff') produce an
  # extra space on column 1 of every content line.
  if test -z "$diff_out_"; then
    compare_ () { diff -u "$@"; }
  else
    compare_ ()
    {
      if diff -u "$@" > diff.out; then
        # No differences were found, but Solaris 'diff' produces output
        # "No differences encountered". Hide this output.
        rm -f diff.out
        true
      else
        cat diff.out
        rm -f diff.out
        false
      fi
    }
  fi
elif diff_out_=`exec 2>/dev/null; diff -c "$0" "$0" < /dev/null`; then
  if test -z "$diff_out_"; then
    compare_ () { diff -c "$@"; }
  else
    compare_ ()
    {
      if diff -c "$@" > diff.out; then
        # No differences were found, but AIX and HP-UX 'diff' produce output
        # "No differences encountered" or "There are no differences between the
        # files.". Hide this output.
        rm -f diff.out
        true
      else
        cat diff.out
        rm -f diff.out
        false
      fi
    }
  fi
elif ( cmp --version < /dev/null 2>&1 | grep GNU ) > /dev/null 2>&1; then
  compare_ () { cmp -s "$@"; }
else
  compare_ () { cmp "$@"; }
fi

# Usage: compare EXPECTED ACTUAL
#
# Given compare_dev_null_'s preprocessing, defer to compare_ if 2 or more.
# Otherwise, propagate $? to caller: any diffs have already been printed.
compare ()
{
  # This looks like it can be factored to use a simple "case $?"
  # after unchecked compare_dev_null_ invocation, but that would
  # fail in a "set -e" environment.
  if compare_dev_null_ "$@"; then
    return 0
  else
    case $? in
      1) return 1;;
      *) compare_ "$@";;
    esac
  fi
}

# An arbitrary prefix to help distinguish test directories.
testdir_prefix_ () { printf gt; }

# Run the user-overridable cleanup_ function, remove the temporary
# directory and exit with the incoming value of $?.
remove_tmp_ ()
{
  __st=$?
  cleanup_
  # cd out of the directory we're about to remove
  cd "$initial_cwd_" || cd / || cd /tmp
  chmod -R u+rwx "$test_dir_"
  # If removal fails and exit status was to be 0, then change it to 1.
  rm -rf "$test_dir_" || { test $__st = 0 && __st=1; }
  exit $__st
}

# Given a directory name, DIR, if every entry in it that matches *.exe
# contains only the specified bytes (see the case stmt below), then print
# a space-separated list of those names and return 0.  Otherwise, don't
# print anything and return 1.  Naming constraints apply also to DIR.
find_exe_basenames_ ()
{
  feb_dir_=$1
  feb_fail_=0
  feb_result_=
  feb_sp_=
  for feb_file_ in $feb_dir_/*.exe; do
    # If there was no *.exe file, or there existed a file named "*.exe" that
    # was deleted between the above glob expansion and the existence test
    # below, just skip it.
    test "x$feb_file_" = "x$feb_dir_/*.exe" && test ! -f "$feb_file_" \
      && continue
    # Exempt [.exe, since we can't create a function by that name, yet
    # we can't invoke [ by PATH search anyways due to shell builtins.
    test "x$feb_file_" = "x$feb_dir_/[.exe" && continue
    case $feb_file_ in
      *[!-a-zA-Z/0-9_.+]*) feb_fail_=1; break;;
      *) # Remove leading file name components as well as the .exe suffix.
         feb_file_=${feb_file_##*/}
         feb_file_=${feb_file_%.exe}
         feb_result_="$feb_result_$feb_sp_$feb_file_";;
    esac
    feb_sp_=' '
  done
  test $feb_fail_ = 0 && printf %s "$feb_result_"
  return $feb_fail_
}

# Consider the files in directory, $1.
# For each file name of the form PROG.exe, create an alias named
# PROG that simply invokes PROG.exe, then return 0.  If any selected
# file name or the directory name, $1, contains an unexpected character,
# define no alias and return 1.
create_exe_shims_ ()
{
  case $EXEEXT in
    '') return 0 ;;
    .exe) ;;
    *) echo "$0: unexpected \$EXEEXT value: $EXEEXT" 1>&2; return 1 ;;
  esac

  base_names_=`find_exe_basenames_ $1` \
    || { echo "$0 (exe_shim): skipping directory: $1" 1>&2; return 0; }

  if test -n "$base_names_"; then
    for base_ in $base_names_; do
      alias "$base_"="$base_$EXEEXT"
    done
  fi

  return 0
}

# Use this function to prepend to PATH an absolute name for each
# specified, possibly-$initial_cwd_-relative, directory.
path_prepend_ ()
{
  while test $# != 0; do
    path_dir_=$1
    case $path_dir_ in
      '') fail_ "invalid path dir: '$1'";;
      /*) abs_path_dir_=$path_dir_;;
      *) abs_path_dir_=$initial_cwd_/$path_dir_;;
    esac
    case $abs_path_dir_ in
      *:*) fail_ "invalid path dir: '$abs_path_dir_'";;
    esac
    PATH="$abs_path_dir_:$PATH"

    # Create an alias, FOO, for each FOO.exe in this directory.
    create_exe_shims_ "$abs_path_dir_" \
      || fail_ "something failed (above): $abs_path_dir_"
    shift
  done
  export PATH
}

setup_ ()
{
  if test "$VERBOSE" = yes; then
    # Test whether set -x may cause the selected shell to corrupt an
    # application's stderr.  Many do, including zsh-4.3.10 and the /bin/sh
    # from SunOS 5.11, OpenBSD 4.7 and Irix 5.x and 6.5.
    # If enabling verbose output this way would cause trouble, simply
    # issue a warning and refrain.
    if $gl_set_x_corrupts_stderr_; then
      warn_ "using SHELL=$SHELL with 'set -x' corrupts stderr"
    else
      set -x
    fi
  fi

  initial_cwd_=$PWD
  fail=0

  pfx_=`testdir_prefix_`
  test_dir_=`mktempd_ "$initial_cwd_" "$pfx_-$ME_.XXXX"` \
    || fail_ "failed to create temporary directory in $initial_cwd_"
  cd "$test_dir_" || fail_ "failed to cd to temporary directory"

  # As autoconf-generated configure scripts do, ensure that IFS
  # is defined initially, so that saving and restoring $IFS works.
  gl_init_sh_nl_='
'
  IFS=" ""	$gl_init_sh_nl_"

  # This trap statement, along with a trap on 0 below, ensure that the
  # temporary directory, $test_dir_, is removed upon exit as well as
  # upon receipt of any of the listed signals.
  for sig_ in 1 2 3 13 15; do
    eval "trap 'Exit $(expr $sig_ + 128)' $sig_"
  done
}

# Create a temporary directory, much like mktemp -d does.
# Written by Jim Meyering.
#
# Usage: mktempd_ /tmp phoey.XXXXXXXXXX
#
# First, try to use the mktemp program.
# Failing that, we'll roll our own mktemp-like function:
#  - try to get random bytes from /dev/urandom
#  - failing that, generate output from a combination of quickly-varying
#      sources and gzip.  Ignore non-varying gzip header, and extract
#      "random" bits from there.
#  - given those bits, map to file-name bytes using tr, and try to create
#      the desired directory.
#  - make only $MAX_TRIES_ attempts

# Helper function.  Print $N pseudo-random bytes from a-zA-Z0-9.
rand_bytes_ ()
{
  n_=$1

  # Maybe try openssl rand -base64 $n_prime_|tr '+/=\012' abcd first?
  # But if they have openssl, they probably have mktemp, too.

  chars_=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
  dev_rand_=/dev/urandom
  if test -r "$dev_rand_"; then
    # Note: 256-length($chars_) == 194; 3 copies of $chars_ is 186 + 8 = 194.
    dd ibs=$n_ count=1 if=$dev_rand_ 2>/dev/null \
      | LC_ALL=C tr -c $chars_ 01234567$chars_$chars_$chars_
    return
  fi

  n_plus_50_=`expr $n_ + 50`
  cmds_='date; date +%N; free; who -a; w; ps auxww; ps ef; netstat -n'
  data_=` (eval "$cmds_") 2>&1 | gzip `

  # Ensure that $data_ has length at least 50+$n_
  while :; do
    len_=`echo "$data_"|wc -c`
    test $n_plus_50_ -le $len_ && break;
    data_=` (echo "$data_"; eval "$cmds_") 2>&1 | gzip `
  done

  echo "$data_" \
    | dd bs=1 skip=50 count=$n_ 2>/dev/null \
    | LC_ALL=C tr -c $chars_ 01234567$chars_$chars_$chars_
}

mktempd_ ()
{
  case $# in
  2);;
  *) fail_ "Usage: mktempd_ DIR TEMPLATE";;
  esac

  destdir_=$1
  template_=$2

  MAX_TRIES_=4

  # Disallow any trailing slash on specified destdir:
  # it would subvert the post-mktemp "case"-based destdir test.
  case $destdir_ in
  /) ;;
  */) fail_ "invalid destination dir: remove trailing slash(es)";;
  esac

  case $template_ in
  *XXXX) ;;
  *) fail_ \
       "invalid template: $template_ (must have a suffix of at least 4 X's)";;
  esac

  # First, try to use mktemp.
  d=`unset TMPDIR; { mktemp -d -t -p "$destdir_" "$template_"; } 2>/dev/null` \
    || fail=1

  # The resulting name must be in the specified directory.
  case $d in "$destdir_"*);; *) fail=1;; esac

  # It must have created the directory.
  test -d "$d" || fail=1

  # It must have 0700 permissions.  Handle sticky "S" bits.
  perms=`ls -dgo "$d" 2>/dev/null|tr S -` || fail=1
  case $perms in drwx------*) ;; *) fail=1;; esac

  test $fail = 0 && {
    echo "$d"
    return
  }

  # If we reach this point, we'll have to create a directory manually.

  # Get a copy of the template without its suffix of X's.
  base_template_=`echo "$template_"|sed 's/XX*$//'`

  # Calculate how many X's we've just removed.
  template_length_=`echo "$template_" | wc -c`
  nx_=`echo "$base_template_" | wc -c`
  nx_=`expr $template_length_ - $nx_`

  err_=
  i_=1
  while :; do
    X_=`rand_bytes_ $nx_`
    candidate_dir_="$destdir_/$base_template_$X_"
    err_=`mkdir -m 0700 "$candidate_dir_" 2>&1` \
      && { echo "$candidate_dir_"; return; }
    test $MAX_TRIES_ -le $i_ && break;
    i_=`expr $i_ + 1`
  done
  fail_ "$err_"
}

# If you want to override the testdir_prefix_ function,
# or to add more utility functions, use this file.
test -f "$srcdir/init.cfg" \
  && . "$srcdir/init.cfg"

setup_ "$@"
# This trap is here, rather than in the setup_ function, because some
# shells run the exit trap at shell function exit, rather than script exit.
trap remove_tmp_ 0