1 files changed, 124 insertions, 0 deletions
diff --git a/scripts/Dpkg/Source/Functions.pm b/scripts/Dpkg/Source/Functions.pm
new file mode 100644
index 0000000..0576657
--- /dev/null
+++ b/scripts/Dpkg/Source/Functions.pm
@@ -0,0 +1,124 @@
+# Copyright © 2008-2010, 2012-2015 Guillem Jover <guillem@debian.org>
+#
+# 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';
+our @EXPORT_OK = qw(
+    erasedir
+    fixperms
+    chmod_if_needed
+    fs_time
+    is_binary
+);
+
+use Exporter qw(import);
+use Errno qw(ENOENT);
+
+use Dpkg::ErrorHandling;
+use Dpkg::Gettext;
+use Dpkg::File;
+use Dpkg::IPC;
+
+sub erasedir {
+    my $dir = shift;
+    if (not lstat($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 directory '%s'"), $dir);
+    }
+    error(g_("rm -rf failed to remove '%s'"), $dir);
+}
+
+sub fixperms {
+    my $dir = shift;
+    my ($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 $?;
+}
+
+# Only change the pathname permissions if they differ from the desired.
+#
+# To be able to build a source tree, a user needs write permissions on it,
+# but not necessarily ownership of those files.
+sub chmod_if_needed {
+    my ($newperms, $pathname) = @_;
+    my $oldperms = (stat $pathname)[2] & 07777;
+
+    return 1 if $oldperms == $newperms;
+    return chmod $newperms, $pathname;
+}
+
+# Touch the file and read the resulting mtime.
+#
+# If the file doesn't exist, create it, read the mtime and unlink it.
+#
+# Use this instead of time() when the timestamp is going to be
+# used to set file timestamps. This avoids confusion when an
+# NFS server and NFS client disagree about what time it is.
+sub fs_time($) {
+    my $file = shift;
+    my $is_temp = 0;
+    if (not -e $file) {
+        file_touch($file);
+	$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 = shift;
+
+    # Perform the same check as diff(1), look for a NUL character in the first
+    # 4 KiB of the file.
+    open my $fh, '<', $file
+        or syserr(g_('cannot open file %s for binary detection'), $file);
+    read $fh, my $buf, 4096, 0;
+    my $res = index $buf, "\0";
+    close $fh;
+
+    return $res >= 0;
+}
+
+1;