tests/init.sh

   1 # source this file; set up for tests
   2
   3 # Copyright (C) 2009-2012 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 <http://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, with single-stepping:
  49 #   1. Go into a sub-shell:
  50 #   $ bash
  51 #   2. Set relevant environment variables from TESTS_ENVIRONMENT in the
  52 #      Makefile:
  53 #   $ export srcdir=../../tests # this is an example
  54 #   3. Execute the commands from the test, copy&pasting them one by one:
  55 #   $ . "$srcdir/init.sh"; path_prepend_ .
  56 #   ...
  57 #   4. Finally
  58 #   $ exit
  59
  60 ME_=`expr "./$0" : '.*/\(.*\)$'`
  61
  62 # We use a trap below for cleanup.  This requires us to go through
  63 # hoops to get the right exit status transported through the handler.
  64 # So use 'Exit STATUS' instead of 'exit STATUS' inside of the tests.
  65 # Turn off errexit here so that we don't trip the bug with OSF1/Tru64
  66 # sh inside this function.
  67 Exit () { set +e; (exit $1); exit $1; }
  68
  69 # Print warnings (e.g., about skipped and failed tests) to this file number.
  70 # Override by defining to say, 9, in init.cfg, and putting say,
  71 #   export ...ENVVAR_SETTINGS...; $(SHELL) 9>&2
  72 # in the definition of TESTS_ENVIRONMENT in your tests/Makefile.am file.
  73 # This is useful when using automake's parallel tests mode, to print
  74 # the reason for skip/failure to console, rather than to the .log files.
  75 : ${stderr_fileno_=2}
  76
  77 # Note that correct expansion of "$*" depends on IFS starting with ' '.
  78 # Always write the full diagnostic to stderr.
  79 # When stderr_fileno_ is not 2, also emit the first line of the
  80 # diagnostic to that file descriptor.
  81 warn_ ()
  82 {
  83   # If IFS does not start with ' ', set it and emit the warning in a subshell.
  84   case $IFS in
  85     ' '*) printf '%s\n' "$*" >&2
  86           test $stderr_fileno_ = 2 \
  87             || { printf '%s\n' "$*" | sed 1q >&$stderr_fileno_ ; } ;;
  88     *) (IFS=' '; warn_ "$@");;
  89   esac
  90 }
  91 fail_ () { warn_ "$ME_: failed test: $@"; Exit 1; }
  92 skip_ () { warn_ "$ME_: skipped test: $@"; Exit 77; }
  93 fatal_ () { warn_ "$ME_: hard error: $@"; Exit 99; }
  94 framework_failure_ () { warn_ "$ME_: set-up failure: $@"; Exit 99; }
  95
  96 # Sanitize this shell to POSIX mode, if possible.
  97 DUALCASE=1; export DUALCASE
  98 if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
  99   emulate sh
 100   NULLCMD=:
 101   alias -g '${1+"$@"}'='"$@"'
 102   setopt NO_GLOB_SUBST
 103 else
 104   case `(set -o) 2>/dev/null` in
 105     *posix*) set -o posix ;;
 106   esac
 107 fi
 108
 109 # We require $(...) support unconditionally.
 110 # We require a few additional shell features only when $EXEEXT is nonempty,
 111 # in order to support automatic $EXEEXT emulation:
 112 # - hyphen-containing alias names
 113 # - we prefer to use ${var#...} substitution, rather than having
 114 #   to work around lack of support for that feature.
 115 # The following code attempts to find a shell with support for these features.
 116 # If the current shell passes the test, we're done.  Otherwise, test other
 117 # shells until we find one that passes.  If one is found, re-exec it.
 118 # If no acceptable shell is found, skip the current test.
 119 #
 120 # The "...set -x; P=1 true 2>err..." test is to disqualify any shell that
 121 # emits "P=1" into err, as /bin/sh from SunOS 5.11 and OpenBSD 4.7 do.
 122 #
 123 # Use "9" to indicate success (rather than 0), in case some shell acts
 124 # like Solaris 10's /bin/sh but exits successfully instead of with status 2.
 125
 126 # Eval this code in a subshell to determine a shell's suitability.
 127 # 10 - passes all tests; ok to use
 128 #  9 - ok, but enabling "set -x" corrupts app stderr; prefer higher score
 129 #  ? - not ok
 130 gl_shell_test_script_='
 131 test $(echo y) = y || exit 1
 132 score_=10
 133 if test "$VERBOSE" = yes; then
 134   test -n "$( (exec 3>&1; set -x; P=1 true 2>&3) 2> /dev/null)" && score_=9
 135 fi
 136 test -z "$EXEEXT" && exit $score_
 137 shopt -s expand_aliases
 138 alias a-b="echo zoo"
 139 v=abx
 140      test ${v%x} = ab \
 141   && test ${v#a} = bx \
 142   && test $(a-b) = zoo \
 143   && exit $score_
 144 '
 145
 146 if test "x$1" = "x--no-reexec"; then
 147   shift
 148 else
 149   # Assume a working shell.  Export to subshells (setup_ needs this).
 150   gl_set_x_corrupts_stderr_=false
 151   export gl_set_x_corrupts_stderr_
 152
 153   # Record the first marginally acceptable shell.
 154   marginal_=
 155
 156   # Search for a shell that meets our requirements.
 157   for re_shell_ in __current__ "${CONFIG_SHELL:-no_shell}" \
 158       /bin/sh bash dash zsh pdksh fail
 159   do
 160     test "$re_shell_" = no_shell && continue
 161
 162     # If we've made it all the way to the sentinel, "fail" without
 163     # finding even a marginal shell, skip this test.
 164     if test "$re_shell_" = fail; then
 165       test -z "$marginal_" && skip_ failed to find an adequate shell
 166       re_shell_=$marginal_
 167       break
 168     fi
 169
 170     # When testing the current shell, simply "eval" the test code.
 171     # Otherwise, run it via $re_shell_ -c ...
 172     if test "$re_shell_" = __current__; then
 173       # 'eval'ing this code makes Solaris 10's /bin/sh exit with
 174       # $? set to 2.  It does not evaluate any of the code after the
 175       # "unexpected" first '('.  Thus, we must run it in a subshell.
 176       ( eval "$gl_shell_test_script_" ) > /dev/null 2>&1
 177     else
 178       "$re_shell_" -c "$gl_shell_test_script_" 2>/dev/null
 179     fi
 180
 181     st_=$?
 182
 183     # $re_shell_ works just fine.  Use it.
 184     if test $st_ = 10; then
 185       gl_set_x_corrupts_stderr_=false
 186       break
 187     fi
 188
 189     # If this is our first marginally acceptable shell, remember it.
 190     if test "$st_:$marginal_" = 9: ; then
 191       marginal_="$re_shell_"
 192       gl_set_x_corrupts_stderr_=true
 193     fi
 194   done
 195
 196   if test "$re_shell_" != __current__; then
 197     # Found a usable shell.  Preserve -v and -x.
 198     case $- in
 199       *v*x* | *x*v*) opts_=-vx ;;
 200       *v*) opts_=-v ;;
 201       *x*) opts_=-x ;;
 202       *) opts_= ;;
 203     esac
 204     exec "$re_shell_" $opts_ "$0" --no-reexec "$@"
 205     echo "$ME_: exec failed" 1>&2
 206     exit 127
 207   fi
 208 fi
 209
 210 test -n "$EXEEXT" && shopt -s expand_aliases
 211
 212 # Enable glibc's malloc-perturbing option.
 213 # This is useful for exposing code that depends on the fact that
 214 # malloc-related functions often return memory that is mostly zeroed.
 215 # If you have the time and cycles, use valgrind to do an even better job.
 216 : ${MALLOC_PERTURB_=87}
 217 export MALLOC_PERTURB_
 218
 219 # This is a stub function that is run upon trap (upon regular exit and
 220 # interrupt).  Override it with a per-test function, e.g., to unmount
 221 # a partition, or to undo any other global state changes.
 222 cleanup_ () { :; }
 223
 224 # Emit a header similar to that from diff -u;  Print the simulated "diff"
 225 # command so that the order of arguments is clear.  Don't bother with @@ lines.
 226 emit_diff_u_header_ ()
 227 {
 228   printf '%s\n' "diff -u $*" \
 229     "--- $1     1970-01-01" \
 230     "+++ $2     1970-01-01"
 231 }
 232
 233 # Arrange not to let diff or cmp operate on /dev/null,
 234 # since on some systems (at least OSF/1 5.1), that doesn't work.
 235 # When there are not two arguments, or no argument is /dev/null, return 2.
 236 # When one argument is /dev/null and the other is not empty,
 237 # cat the nonempty file to stderr and return 1.
 238 # Otherwise, return 0.
 239 compare_dev_null_ ()
 240 {
 241   test $# = 2 || return 2
 242
 243   if test "x$1" = x/dev/null; then
 244     test -s "$2" || return 0
 245     emit_diff_u_header_ "$@"; sed 's/^/+/' "$2"
 246     return 1
 247   fi
 248
 249   if test "x$2" = x/dev/null; then
 250     test -s "$1" || return 0
 251     emit_diff_u_header_ "$@"; sed 's/^/-/' "$1"
 252     return 1
 253   fi
 254
 255   return 2
 256 }
 257
 258 if diff_out_=`exec 2>/dev/null; diff -u "$0" "$0" < /dev/null`; then
 259   if test -z "$diff_out_"; then
 260     compare_ () { diff -u "$@"; }
 261   else
 262     compare_ ()
 263     {
 264       if diff -u "$@" > diff.out; then
 265         # No differences were found, but Solaris 'diff' produces output
 266         # "No differences encountered". Hide this output.
 267         rm -f diff.out
 268         true
 269       else
 270         cat diff.out
 271         rm -f diff.out
 272         false
 273       fi
 274     }
 275   fi
 276 elif diff_out_=`exec 2>/dev/null; diff -c "$0" "$0" < /dev/null`; then
 277   if test -z "$diff_out_"; then
 278     compare_ () { diff -c "$@"; }
 279   else
 280     compare_ ()
 281     {
 282       if diff -c "$@" > diff.out; then
 283         # No differences were found, but AIX and HP-UX 'diff' produce output
 284         # "No differences encountered" or "There are no differences between the
 285         # files.". Hide this output.
 286         rm -f diff.out
 287         true
 288       else
 289         cat diff.out
 290         rm -f diff.out
 291         false
 292       fi
 293     }
 294   fi
 295 elif ( cmp --version < /dev/null 2>&1 | grep GNU ) > /dev/null 2>&1; then
 296   compare_ () { cmp -s "$@"; }
 297 else
 298   compare_ () { cmp "$@"; }
 299 fi
 300
 301 # Usage: compare EXPECTED ACTUAL
 302 #
 303 # Given compare_dev_null_'s preprocessing, defer to compare_ if 2 or more.
 304 # Otherwise, propagate $? to caller: any diffs have already been printed.
 305 compare ()
 306 {
 307   # This looks like it can be factored to use a simple "case $?"
 308   # after unchecked compare_dev_null_ invocation, but that would
 309   # fail in a "set -e" environment.
 310   if compare_dev_null_ "$@"; then
 311     return 0
 312   else
 313     case $? in
 314       1) return 1;;
 315       *) compare_ "$@";;
 316     esac
 317   fi
 318 }
 319
 320 # An arbitrary prefix to help distinguish test directories.
 321 testdir_prefix_ () { printf gt; }
 322
 323 # Run the user-overridable cleanup_ function, remove the temporary
 324 # directory and exit with the incoming value of $?.
 325 remove_tmp_ ()
 326 {
 327   __st=$?
 328   cleanup_
 329   # cd out of the directory we're about to remove
 330   cd "$initial_cwd_" || cd / || cd /tmp
 331   chmod -R u+rwx "$test_dir_"
 332   # If removal fails and exit status was to be 0, then change it to 1.
 333   rm -rf "$test_dir_" || { test $__st = 0 && __st=1; }
 334   exit $__st
 335 }
 336
 337 # Given a directory name, DIR, if every entry in it that matches *.exe
 338 # contains only the specified bytes (see the case stmt below), then print
 339 # a space-separated list of those names and return 0.  Otherwise, don't
 340 # print anything and return 1.  Naming constraints apply also to DIR.
 341 find_exe_basenames_ ()
 342 {
 343   feb_dir_=$1
 344   feb_fail_=0
 345   feb_result_=
 346   feb_sp_=
 347   for feb_file_ in $feb_dir_/*.exe; do
 348     # If there was no *.exe file, or there existed a file named "*.exe" that
 349     # was deleted between the above glob expansion and the existence test
 350     # below, just skip it.
 351     test "x$feb_file_" = "x$feb_dir_/*.exe" && test ! -f "$feb_file_" \
 352       && continue
 353     # Exempt [.exe, since we can't create a function by that name, yet
 354     # we can't invoke [ by PATH search anyways due to shell builtins.
 355     test "x$feb_file_" = "x$feb_dir_/[.exe" && continue
 356     case $feb_file_ in
 357       *[!-a-zA-Z/0-9_.+]*) feb_fail_=1; break;;
 358       *) # Remove leading file name components as well as the .exe suffix.
 359          feb_file_=${feb_file_##*/}
 360          feb_file_=${feb_file_%.exe}
 361          feb_result_="$feb_result_$feb_sp_$feb_file_";;
 362     esac
 363     feb_sp_=' '
 364   done
 365   test $feb_fail_ = 0 && printf %s "$feb_result_"
 366   return $feb_fail_
 367 }
 368
 369 # Consider the files in directory, $1.
 370 # For each file name of the form PROG.exe, create an alias named
 371 # PROG that simply invokes PROG.exe, then return 0.  If any selected
 372 # file name or the directory name, $1, contains an unexpected character,
 373 # define no alias and return 1.
 374 create_exe_shims_ ()
 375 {
 376   case $EXEEXT in
 377     '') return 0 ;;
 378     .exe) ;;
 379     *) echo "$0: unexpected \$EXEEXT value: $EXEEXT" 1>&2; return 1 ;;
 380   esac
 381
 382   base_names_=`find_exe_basenames_ $1` \
 383     || { echo "$0 (exe_shim): skipping directory: $1" 1>&2; return 0; }
 384
 385   if test -n "$base_names_"; then
 386     for base_ in $base_names_; do
 387       alias "$base_"="$base_$EXEEXT"
 388     done
 389   fi
 390
 391   return 0
 392 }
 393
 394 # Use this function to prepend to PATH an absolute name for each
 395 # specified, possibly-$initial_cwd_-relative, directory.
 396 path_prepend_ ()
 397 {
 398   while test $# != 0; do
 399     path_dir_=$1
 400     case $path_dir_ in
 401       '') fail_ "invalid path dir: '$1'";;
 402       /*) abs_path_dir_=$path_dir_;;
 403       *) abs_path_dir_=`cd "$initial_cwd_/$path_dir_" && echo "$PWD"` \
 404            || fail_ "invalid path dir: $path_dir_";;
 405     esac
 406     case $abs_path_dir_ in
 407       *:*) fail_ "invalid path dir: '$abs_path_dir_'";;
 408     esac
 409     PATH="$abs_path_dir_:$PATH"
 410
 411     # Create an alias, FOO, for each FOO.exe in this directory.
 412     create_exe_shims_ "$abs_path_dir_" \
 413       || fail_ "something failed (above): $abs_path_dir_"
 414     shift
 415   done
 416   export PATH
 417 }
 418
 419 setup_ ()
 420 {
 421   if test "$VERBOSE" = yes; then
 422     # Test whether set -x may cause the selected shell to corrupt an
 423     # application's stderr.  Many do, including zsh-4.3.10 and the /bin/sh
 424     # from SunOS 5.11, OpenBSD 4.7 and Irix 5.x and 6.5.
 425     # If enabling verbose output this way would cause trouble, simply
 426     # issue a warning and refrain.
 427     if $gl_set_x_corrupts_stderr_; then
 428       warn_ "using SHELL=$SHELL with 'set -x' corrupts stderr"
 429     else
 430       set -x
 431     fi
 432   fi
 433
 434   initial_cwd_=$PWD
 435   fail=0
 436
 437   pfx_=`testdir_prefix_`
 438   test_dir_=`mktempd_ "$initial_cwd_" "$pfx_-$ME_.XXXX"` \
 439     || fail_ "failed to create temporary directory in $initial_cwd_"
 440   cd "$test_dir_"
 441
 442   # As autoconf-generated configure scripts do, ensure that IFS
 443   # is defined initially, so that saving and restoring $IFS works.
 444   gl_init_sh_nl_='
 445 '
 446   IFS=" ""      $gl_init_sh_nl_"
 447
 448   # This trap statement, along with a trap on 0 below, ensure that the
 449   # temporary directory, $test_dir_, is removed upon exit as well as
 450   # upon receipt of any of the listed signals.
 451   for sig_ in 1 2 3 13 15; do
 452     eval "trap 'Exit $(expr $sig_ + 128)' $sig_"
 453   done
 454 }
 455
 456 # Create a temporary directory, much like mktemp -d does.
 457 # Written by Jim Meyering.
 458 #
 459 # Usage: mktempd_ /tmp phoey.XXXXXXXXXX
 460 #
 461 # First, try to use the mktemp program.
 462 # Failing that, we'll roll our own mktemp-like function:
 463 #  - try to get random bytes from /dev/urandom
 464 #  - failing that, generate output from a combination of quickly-varying
 465 #      sources and gzip.  Ignore non-varying gzip header, and extract
 466 #      "random" bits from there.
 467 #  - given those bits, map to file-name bytes using tr, and try to create
 468 #      the desired directory.
 469 #  - make only $MAX_TRIES_ attempts
 470
 471 # Helper function.  Print $N pseudo-random bytes from a-zA-Z0-9.
 472 rand_bytes_ ()
 473 {
 474   n_=$1
 475
 476   # Maybe try openssl rand -base64 $n_prime_|tr '+/=\012' abcd first?
 477   # But if they have openssl, they probably have mktemp, too.
 478
 479   chars_=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
 480   dev_rand_=/dev/urandom
 481   if test -r "$dev_rand_"; then
 482     # Note: 256-length($chars_) == 194; 3 copies of $chars_ is 186 + 8 = 194.
 483     dd ibs=$n_ count=1 if=$dev_rand_ 2>/dev/null \
 484       | LC_ALL=C tr -c $chars_ 01234567$chars_$chars_$chars_
 485     return
 486   fi
 487
 488   n_plus_50_=`expr $n_ + 50`
 489   cmds_='date; date +%N; free; who -a; w; ps auxww; ps ef; netstat -n'
 490   data_=` (eval "$cmds_") 2>&1 | gzip `
 491
 492   # Ensure that $data_ has length at least 50+$n_
 493   while :; do
 494     len_=`echo "$data_"|wc -c`
 495     test $n_plus_50_ -le $len_ && break;
 496     data_=` (echo "$data_"; eval "$cmds_") 2>&1 | gzip `
 497   done
 498
 499   echo "$data_" \
 500     | dd bs=1 skip=50 count=$n_ 2>/dev/null \
 501     | LC_ALL=C tr -c $chars_ 01234567$chars_$chars_$chars_
 502 }
 503
 504 mktempd_ ()
 505 {
 506   case $# in
 507   2);;
 508   *) fail_ "Usage: mktempd_ DIR TEMPLATE";;
 509   esac
 510
 511   destdir_=$1
 512   template_=$2
 513
 514   MAX_TRIES_=4
 515
 516   # Disallow any trailing slash on specified destdir:
 517   # it would subvert the post-mktemp "case"-based destdir test.
 518   case $destdir_ in
 519   /) ;;
 520   */) fail_ "invalid destination dir: remove trailing slash(es)";;
 521   esac
 522
 523   case $template_ in
 524   *XXXX) ;;
 525   *) fail_ \
 526        "invalid template: $template_ (must have a suffix of at least 4 X's)";;
 527   esac
 528
 529   # First, try to use mktemp.
 530   d=`unset TMPDIR; { mktemp -d -t -p "$destdir_" "$template_"; } 2>/dev/null` \
 531     || fail=1
 532
 533   # The resulting name must be in the specified directory.
 534   case $d in "$destdir_"*);; *) fail=1;; esac
 535
 536   # It must have created the directory.
 537   test -d "$d" || fail=1
 538
 539   # It must have 0700 permissions.  Handle sticky "S" bits.
 540   perms=`ls -dgo "$d" 2>/dev/null|tr S -` || fail=1
 541   case $perms in drwx------*) ;; *) fail=1;; esac
 542
 543   test $fail = 0 && {
 544     echo "$d"
 545     return
 546   }
 547
 548   # If we reach this point, we'll have to create a directory manually.
 549
 550   # Get a copy of the template without its suffix of X's.
 551   base_template_=`echo "$template_"|sed 's/XX*$//'`
 552
 553   # Calculate how many X's we've just removed.
 554   template_length_=`echo "$template_" | wc -c`
 555   nx_=`echo "$base_template_" | wc -c`
 556   nx_=`expr $template_length_ - $nx_`
 557
 558   err_=
 559   i_=1
 560   while :; do
 561     X_=`rand_bytes_ $nx_`
 562     candidate_dir_="$destdir_/$base_template_$X_"
 563     err_=`mkdir -m 0700 "$candidate_dir_" 2>&1` \
 564       && { echo "$candidate_dir_"; return; }
 565     test $MAX_TRIES_ -le $i_ && break;
 566     i_=`expr $i_ + 1`
 567   done
 568   fail_ "$err_"
 569 }
 570
 571 # If you want to override the testdir_prefix_ function,
 572 # or to add more utility functions, use this file.
 573 test -f "$srcdir/init.cfg" \
 574   && . "$srcdir/init.cfg"
 575
 576 setup_ "$@"
 577 # This trap is here, rather than in the setup_ function, because some
 578 # shells run the exit trap at shell function exit, rather than script exit.
 579 trap remove_tmp_ 0