posix-modules

   1 #!/bin/sh
   2 #
   3 # Copyright (C) 2002-2008, 2010-2012 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
  19 progname=$0
  20 package=gnulib
  21
  22 # func_usage
  23 # outputs to stdout the --help usage message.
  24 func_usage ()
  25 {
  26   echo "\
  27 Usage: posix-modules
  28
  29 Lists the gnulib modules that implement POSIX interfaces.
  30
  31 Report bugs to <bug-gnulib@gnu.org>."
  32 }
  33
  34 # func_version
  35 # outputs to stdout the --version message.
  36 func_version ()
  37 {
  38   func_gnulib_dir
  39   if test -d "$gnulib_dir"/.git \
  40      && (git --version) >/dev/null 2>/dev/null \
  41      && (date --version) >/dev/null 2>/dev/null; then
  42     # gnulib checked out from git.
  43     sed_extract_first_date='/^Date/{
  44 s/^Date:[        ]*//p
  45 q
  46 }'
  47     date=`cd "$gnulib_dir" && git log ChangeLog | sed -n -e "$sed_extract_first_date"`
  48     # Turn "Fri Mar 21 07:16:51 2008 -0600" into "Mar 21 2008 07:16:51 -0600".
  49     sed_year_before_time='s/^[^ ]* \([^ ]*\) \([0-9]*\) \([0-9:]*\) \([0-9]*\) /\1 \2 \4 \3 /'
  50     date=`echo "$date" | sed -e "$sed_year_before_time"`
  51     # Use GNU date to compute the time in GMT.
  52     date=`date -d "$date" -u +"%Y-%m-%d %H:%M:%S"`
  53     version=' '`cd "$gnulib_dir" && ./build-aux/git-version-gen /dev/null | sed -e 's/-dirty/-modified/'`
  54   else
  55     if test -d "$gnulib_dir"/CVS \
  56        && (cvs --version) >/dev/null 2>/dev/null; then
  57       # gnulib checked out from CVS.
  58       sed_extract_first_date='/^date: /{
  59 s/^date: \([0-9][0-9][0-9][0-9]\).\([0-9][0-9]\).\([0-9][0-9]\) \([0-9][0-9]:[0-9][0-9]:[0-9][0-9]\).*/\1-\2-\3 \4/p
  60 q
  61 }'
  62       date=`cd "$gnulib_dir" && cvs log -N ChangeLog 2>/dev/null | sed -n -e "$sed_extract_first_date"`
  63     else
  64       # gnulib copy without versioning information.
  65       date=`sed -e 's/ .*//;q' "$gnulib_dir"/ChangeLog`
  66     fi
  67     version=
  68   fi
  69   year=`"$gnulib_dir"/build-aux/mdate-sh "$self_abspathname" | sed 's,^.* ,,'`
  70   echo "\
  71 posix-modules (GNU $package $date)$version
  72 Copyright (C) $year Free Software Foundation, Inc.
  73 License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  74 This is free software: you are free to change and redistribute it.
  75 There is NO WARRANTY, to the extent permitted by law.
  76
  77 Written by" "Bruno Haible"
  78 }
  79
  80 # func_exit STATUS
  81 # exits with a given status.
  82 # This function needs to be used, rather than 'exit', when a 'trap' handler is
  83 # in effect that refers to $?.
  84 func_exit ()
  85 {
  86   (exit $1); exit $1
  87 }
  88
  89 # func_gnulib_dir
  90 # locates the directory where the gnulib repository lives
  91 # Input:
  92 # - progname                 name of this program
  93 # Sets variables
  94 # - self_abspathname         absolute pathname of this program
  95 # - gnulib_dir               absolute pathname of gnulib repository
  96 func_gnulib_dir ()
  97 {
  98   case "$progname" in
  99     /*) self_abspathname="$progname" ;;
 100     */*) self_abspathname=`pwd`/"$progname" ;;
 101     *)
 102       # Look in $PATH.
 103       # Iterate through the elements of $PATH.
 104       # We use IFS=: instead of
 105       #   for d in `echo ":$PATH:" | sed -e 's/:::*/:.:/g' | sed -e 's/:/ /g'`
 106       # because the latter does not work when some PATH element contains spaces.
 107       # We use a canonicalized $pathx instead of $PATH, because empty PATH
 108       # elements are by definition equivalent to '.', however field splitting
 109       # according to IFS=: loses empty fields in many shells:
 110       #   - /bin/sh on OSF/1 and Solaris loses all empty fields (at the
 111       #     beginning, at the end, and in the middle),
 112       #   - /bin/sh on IRIX and /bin/ksh on IRIX and OSF/1 lose empty fields
 113       #     at the beginning and at the end,
 114       #   - GNU bash, /bin/sh on AIX and HP-UX, and /bin/ksh on AIX, HP-UX,
 115       #     Solaris lose empty fields at the end.
 116       # The 'case' statement is an optimization, to avoid evaluating the
 117       # explicit canonicalization command when $PATH contains no empty fields.
 118       self_abspathname=
 119       if test "${PATH_SEPARATOR+set}" != set; then
 120         # Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which
 121         # contains only /bin. Note that ksh looks also at the FPATH variable,
 122         # so we have to set that as well for the test.
 123         PATH_SEPARATOR=:
 124         (PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
 125           && { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
 126                  || PATH_SEPARATOR=';'
 127              }
 128       fi
 129       if test "$PATH_SEPARATOR" = ";"; then
 130         # On Windows, programs are searched in "." before $PATH.
 131         pathx=".;$PATH"
 132       else
 133         # On Unix, we have to convert empty PATH elements to ".".
 134         pathx="$PATH"
 135         case :$PATH: in
 136           *::*)
 137             pathx=`echo ":$PATH:" | sed -e 's/:::*/:.:/g' -e 's/^://' -e 's/:\$//'`
 138             ;;
 139         esac
 140       fi
 141       save_IFS="$IFS"
 142       IFS="$PATH_SEPARATOR"
 143       for d in $pathx; do
 144         IFS="$save_IFS"
 145         test -z "$d" && d=.
 146         if test -x "$d/$progname" && test ! -d "$d/$progname"; then
 147           self_abspathname="$d/$progname"
 148           break
 149         fi
 150       done
 151       IFS="$save_IFS"
 152       if test -z "$self_abspathname"; then
 153         func_fatal_error "could not locate the posix-modules program - how did you invoke it?"
 154       fi
 155       ;;
 156   esac
 157   while test -h "$self_abspathname"; do
 158     # Resolve symbolic link.
 159     linkval=`func_readlink "$self_abspathname"`
 160     test -n "$linkval" || break
 161     case "$linkval" in
 162       /* ) self_abspathname="$linkval" ;;
 163       * ) self_abspathname=`echo "$self_abspathname" | sed -e 's,/[^/]*$,,'`/"$linkval" ;;
 164     esac
 165   done
 166   gnulib_dir=`echo "$self_abspathname" | sed -e 's,/[^/]*$,,'`
 167 }
 168
 169 # func_tmpdir
 170 # creates a temporary directory.
 171 # Input:
 172 # - progname                 name of this program
 173 # Sets variable
 174 # - tmp             pathname of freshly created temporary directory
 175 func_tmpdir ()
 176 {
 177   # Use the environment variable TMPDIR, falling back to /tmp. This allows
 178   # users to specify a different temporary directory, for example, if their
 179   # /tmp is filled up or too small.
 180   : ${TMPDIR=/tmp}
 181   {
 182     # Use the mktemp program if available. If not available, hide the error
 183     # message.
 184     tmp=`(umask 077 && mktemp -d "$TMPDIR/glXXXXXX") 2>/dev/null` &&
 185     test -n "$tmp" && test -d "$tmp"
 186   } ||
 187   {
 188     # Use a simple mkdir command. It is guaranteed to fail if the directory
 189     # already exists.  $RANDOM is bash specific and expands to empty in shells
 190     # other than bash, ksh and zsh.  Its use does not increase security;
 191     # rather, it minimizes the probability of failure in a very cluttered /tmp
 192     # directory.
 193     tmp=$TMPDIR/gl$$-$RANDOM
 194     (umask 077 && mkdir "$tmp")
 195   } ||
 196   {
 197     echo "$progname: cannot create a temporary directory in $TMPDIR" >&2
 198     func_exit 1
 199   }
 200 }
 201
 202 # func_fatal_error message
 203 # outputs to stderr a fatal error message, and terminates the program.
 204 # Input:
 205 # - progname                 name of this program
 206 func_fatal_error ()
 207 {
 208   echo "$progname: *** $1" 1>&2
 209   echo "$progname: *** Stop." 1>&2
 210   func_exit 1
 211 }
 212
 213 # func_readlink SYMLINK
 214 # outputs the target of the given symlink.
 215 if (type -p readlink) > /dev/null 2>&1; then
 216   func_readlink ()
 217   {
 218     # Use the readlink program from GNU coreutils.
 219     readlink "$1"
 220   }
 221 else
 222   func_readlink ()
 223   {
 224     # Use two sed invocations. A single sed -n -e 's,^.* -> \(.*\)$,\1,p'
 225     # would do the wrong thing if the link target contains " -> ".
 226     LC_ALL=C ls -l "$1" | sed -e 's, -> ,#%%#,' | sed -n -e 's,^.*#%%#\(.*\)$,\1,p'
 227   }
 228 fi
 229
 230 # Command-line option processing.
 231 while test $# -gt 0; do
 232   case "$1" in
 233     --help | --hel | --he | --h )
 234       func_usage
 235       exit $? ;;
 236     --version | --versio | --versi | --vers | --ver | --ve | --v )
 237       func_version
 238       exit $? ;;
 239     -* )
 240       echo "posix-modules: unknown option $1" 1>&2
 241       echo "Try 'posix-modules --help' for more information." 1>&2
 242       exit 1 ;;
 243     * )
 244       echo "posix-modules: too many arguments" 1>&2
 245       echo "Try 'posix-modules --help' for more information." 1>&2
 246       exit 1 ;;
 247   esac
 248 done
 249
 250 func_gnulib_dir
 251 (
 252   # Get the header modules.
 253   LC_ALL=C grep -h '^Gnulib module: ' "$gnulib_dir"/doc/posix-headers/*.texi 2>/dev/null \
 254     | sed -e 's,^Gnulib module: ,,'
 255   # Get the function modules.
 256   LC_ALL=C grep -h '^Gnulib module: ' "$gnulib_dir"/doc/posix-functions/*.texi 2>/dev/null \
 257     | sed -e 's,^Gnulib module: ,,'
 258   # Then filter out the words "---", ",", "and", "or" and remove *-gnu modules.
 259 ) | sed -e 's/,/ /g' | LC_ALL=C sort | LC_ALL=C uniq \
 260   | { # Then filter out the words "---", "and", "or" and remove *-gnu modules.
 261       tr ' ' '\012' | sed -e '/^---$/d' -e '/^and$/d' -e '/^or$/d' -e '/-gnu$/d'
 262     } \
 263   | LC_ALL=C sort | LC_ALL=C uniq
 264
 265 # Local Variables:
 266 # indent-tabs-mode: nil
 267 # whitespace-check-buffer-indent: nil
 268 # End: