Mercurial > hg > octave-lyh > gnulib-hg
changeset 8266:c38f0e90bab8
Snippet of code that provides relocatability to shell scripts.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Thu, 01 Mar 2007 02:07:34 +0000 |
parents | 20006894dae4 |
children | 28ddd7a26347 |
files | build-aux/relocatable.sh.in |
diffstat | 1 files changed, 132 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
new file mode 100644 --- /dev/null +++ b/build-aux/relocatable.sh.in @@ -0,0 +1,132 @@ +# The functions in this file provide support for relocatability of +# shell scripts. They should be included near the beginning of each +# shell script in a relocatable program, by adding @relocatable_sh@ +# and causing the script to be expanded with AC_CONFIG_FILES. A +# small amount of additional code must be added and adapted to the +# package by hand; see doc/relocatable-maint.texi (in Gnulib) for +# details. +# +# Copyright (C) 2003, 2005-2007 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 2, 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, write to the Free Software Foundation, +# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +# + +# func_tmpdir +# creates a temporary directory. +# Sets variable +# - tmp pathname of freshly created temporary directory +func_tmpdir () +{ + # Use the environment variable TMPDIR, falling back to /tmp. This allows + # users to specify a different temporary directory, for example, if their + # /tmp is filled up or too small. + : ${TMPDIR=/tmp} + { + # Use the mktemp program if available. If not available, hide the error + # message. + tmp=`(umask 077 && mktemp -d "$TMPDIR/glXXXXXX") 2>/dev/null` && + test -n "$tmp" && test -d "$tmp" + } || + { + # Use a simple mkdir command. It is guaranteed to fail if the directory + # already exists. $RANDOM is bash specific and expands to empty in shells + # other than bash, ksh and zsh. Its use does not increase security; + # rather, it minimizes the probability of failure in a very cluttered /tmp + # directory. + tmp=$TMPDIR/gl$$-$RANDOM + (umask 077 && mkdir "$tmp") + } || + { + echo "$0: cannot create a temporary directory in $TMPDIR" >&2 + { (exit 1); exit 1; } + } +} + +# Support for relocatability. +func_find_curr_installdir () +{ + # Determine curr_installdir, even taking into account symlinks. + curr_executable="$0" + case "$curr_executable" in + */* | *\\*) ;; + *) # Need to look in the PATH. + if test "${PATH_SEPARATOR+set}" != set; then + func_tmpdir + { echo "#! /bin/sh"; echo "exit 0"; } > "$tmp"/conf.sh + chmod +x "$tmp"/conf.sh + if (PATH="/nonexistent;$tmp"; conf.sh) >/dev/null 2>&1; then + PATH_SEPARATOR=';' + else + PATH_SEPARATOR=: + fi + rm -rf "$tmp" + fi + save_IFS="$IFS"; IFS="$PATH_SEPARATOR" + for dir in $PATH; do + IFS="$save_IFS" + test -z "$dir" && dir=. + for exec_ext in ''; do + if test -f "$dir/$curr_executable$exec_ext"; then + curr_executable="$dir/$curr_executable$exec_ext" + break 2 + fi + done + done + IFS="$save_IFS" + ;; + esac + # Make absolute. + case "$curr_executable" in + /* | ?:/* | ?:\\*) ;; + *) curr_executable=`pwd`/"$curr_executable" ;; + esac + # Resolve symlinks. + sed_dirname='s,/[^/]*$,,' + sed_linkdest='s,^.* -> \(.*\),\1,p' + while : ; do + lsline=`LC_ALL=C ls -l "$curr_executable"` + case "$lsline" in + *" -> "*) + linkdest=`echo "$lsline" | sed -n -e "$sed_linkdest"` + case "$linkdest" in + /* | ?:/* | ?:\\*) curr_executable="$linkdest" ;; + *) curr_executable=`echo "$curr_executable" | sed -e "$sed_dirname"`/"$linkdest" ;; + esac ;; + *) break ;; + esac + done + curr_installdir=`echo "$curr_executable" | sed -e 's,/[^/]*$,,'` + # Canonicalize. + curr_installdir=`cd "$curr_installdir" && pwd` +} +func_find_prefixes () +{ + # Compute the original/current installation prefixes by stripping the + # trailing directories off the original/current installation directories. + orig_installprefix="$orig_installdir" + curr_installprefix="$curr_installdir" + while true; do + orig_last=`echo "$orig_installprefix" | sed -n -e 's,^.*/\([^/]*\)$,\1,p'` + curr_last=`echo "$curr_installprefix" | sed -n -e 's,^.*/\([^/]*\)$,\1,p'` + if test -z "$orig_last" || test -z "$curr_last"; then + break + fi + if test "$orig_last" != "$curr_last"; then + break + fi + orig_installprefix=`echo "$orig_installprefix" | sed -e 's,/[^/]*$,,'` + curr_installprefix=`echo "$curr_installprefix" | sed -e 's,/[^/]*$,,'` + done +}