Revert of Linux build: Use sysroot when calculating dependencies

third_party/dpkg-dev/scripts/Dpkg/Source/Functions.pm

-# 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 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 <https://www.gnu.org/licenses/>.
-
-package Dpkg::Source::Functions;
-
-use strict;
-use warnings;
-
-our $VERSION = '0.01';
-
-use Exporter qw(import);
-our @EXPORT_OK = qw(erasedir fixperms fs_time is_binary);
-
-use Dpkg::ErrorHandling;
-use Dpkg::Gettext;
-use Dpkg::IPC;
-
-use POSIX qw(:errno_h);
-
-sub erasedir {
-    my ($dir) = @_;
-    if (not lstat($dir)) {
-        return if $! == ENOENT;
-        syserr(_g('cannot stat directory %s (before removal)'), $dir);
-    }
-    system 'rm','-rf','--',$dir;
-    subprocerr("rm -rf $dir") if $?;
-    if (not stat($dir)) {
-        return if $! == ENOENT;
-        syserr(_g("unable to check for removal of dir `%s'"), $dir);
-    }
-    error(_g("rm -rf failed to remove `%s'"), $dir);
-}
-
-sub fixperms {
-    my ($dir) = @_;
-    my ($mode, $modes_set);
-    # Unfortunately tar insists on applying our umask _to the original
-    # permissions_ rather than mostly-ignoring the original
-    # permissions.  We fix it up with chmod -R (which saves us some
-    # work) but we have to construct a u+/- string which is a bit
-    # of a palaver.  (Numeric doesn't work because we need [ugo]+X
-    # and [ugo]=<stuff> doesn't work because that unsets sgid on dirs.)
-    $mode = 0777 & ~umask;
-    for my $i (0 .. 2) {
-        $modes_set .= ',' if $i;
-        $modes_set .= qw(u g o)[$i];
-        for my $j (0 .. 2) {
-            $modes_set .= $mode & (0400 >> ($i * 3 + $j)) ? '+' : '-';
-            $modes_set .= qw(r w X)[$j];
-        }
-    }
-    system('chmod', '-R', '--', $modes_set, $dir);
-    subprocerr("chmod -R -- $modes_set $dir") if $?;
-}
-
-# Touch the file and read the resulting mtime.
-#
-# If the file doesn't exist, create it, read the mtime and unlink it.
-#
-# Use this instead of time() when the timestamp is going to be
-# used to set file timestamps. This avoids confusion when an
-# NFS server and NFS client disagree about what time it is.
-sub fs_time($) {
-    my ($file) = @_;
-    my $is_temp = 0;
-    if (not -e $file) {
-        open(my $temp_fh, '>', $file) or syserr(_g('cannot write %s'));
-        close($temp_fh);
-        $is_temp = 1;
-    } else {
-        utime(undef, undef, $file) or
-            syserr(_g('cannot change timestamp for %s'), $file);
-    }
-    stat($file) or syserr(_g('cannot read timestamp from %s'), $file);
-    my $mtime = (stat(_))[9];
-    unlink($file) if $is_temp;
-    return $mtime;
-}
-
-sub is_binary($) {
-    my ($file) = @_;
-
-    # TODO: might want to reimplement what diff does, aka checking if the
-    # file contains \0 in the first 4Kb of data
-
-    # Use diff to check if it's a binary file
-    my $diffgen;
-    my $diff_pid = spawn(
-        exec => [ 'diff', '-u', '--', '/dev/null', $file ],
-        env => { LC_ALL => 'C', LANG => 'C', TZ => 'UTC0' },
-        to_pipe => \$diffgen,
-    );
-    my $result = 0;
-    local $_;
-    while (<$diffgen>) {
-        if (m/^(?:binary|[^-+\@ ].*\bdiffer\b)/i) {
-            $result = 1;
-            last;
-        } elsif (m/^[-+\@ ]/) {
-            $result = 0;
-            last;
-        }
-    }
-    close($diffgen) or syserr('close on diff pipe');
-    wait_child($diff_pid, nocheck => 1, cmdline => "diff -u -- /dev/null $file");
-    return $result;
-}
-
-1;