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# The functions in this file provide support for relocatability of
# Perl scripts. They should be included near the beginning of each
# Perl script in a relocatable program, by adding @relocatable_pl@
# 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.
#
# This code is based on relocatable.sh.in, and design changes (and
# bugs) should probably be cross-checked with it.
#
# Copyright (C) 2013, 2015-2017 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/>.
#
use Config;
use File::Basename;
use File::Spec::Functions;
use Cwd 'realpath';
# Support for relocatability.
sub find_curr_installdir {
# Determine curr_installdir, even taking into account symlinks.
my $curr_executable = $0;
my $basename = basename($0);
if ($curr_executable eq $basename) {
LOOP: for my $dir (split /$Config{path_sep}/, $ENV{PATH}) {
$dir = "." unless $dir;
for my $ext ('') {
my $filename = catfile($dir, "$curr_executable$ext");
if (-f $filename) {
$curr_executable = $filename;
last LOOP;
}
}
}
}
# Resolve symlinks and canonicalize.
return realpath(dirname($curr_executable));
}
sub find_prefixes {
# Compute the original/current installation prefixes by stripping the
# trailing directories off the original/current installation directories.
my ($orig_installprefix, $curr_installprefix) = @_;
my $orig_last = basename($orig_installprefix);
my $curr_last = basename($curr_installprefix);
if ($orig_last && $curr_last && $orig_last eq $curr_last) {
$orig_installprefix = dirname($orig_installprefix);
$curr_installprefix = dirname($curr_installprefix);
}
return $orig_installprefix, $curr_installprefix;
}
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