1 files changed, 83 insertions, 0 deletions
diff --git a/scripts/Dpkg/OpenPGP.pm b/scripts/Dpkg/OpenPGP.pm
new file mode 100644
index 0000000..f719e6e
--- /dev/null
+++ b/scripts/Dpkg/OpenPGP.pm
@@ -0,0 +1,83 @@
+# Copyright © 2017 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::OpenPGP;
+
+use strict;
+use warnings;
+
+use Exporter qw(import);
+use File::Copy;
+
+use Dpkg::Gettext;
+use Dpkg::ErrorHandling;
+use Dpkg::Path qw(find_command);
+
+our $VERSION = '0.01';
+our @EXPORT = qw(
+    openpgp_sig_to_asc
+);
+
+sub openpgp_sig_to_asc
+{
+    my ($sig, $asc) = @_;
+
+    if (-e $sig) {
+        my $is_openpgp_ascii_armor = 0;
+
+        open my $fh_sig, '<', $sig or syserr(g_('cannot open %s'), $sig);
+        while (<$fh_sig>) {
+            if (m/^-----BEGIN PGP /) {
+                $is_openpgp_ascii_armor = 1;
+                last;
+            }
+        }
+        close $fh_sig;
+
+        if ($is_openpgp_ascii_armor) {
+            notice(g_('signature file is already OpenPGP ASCII armor, copying'));
+            copy($sig, $asc);
+            return $asc;
+        }
+
+        if (not find_command('gpg')) {
+            warning(g_('cannot OpenPGP ASCII armor signature file due to missing gpg'));
+        }
+
+        my @gpg_opts = qw(--no-options);
+
+        open my $fh_asc, '>', $asc
+            or syserr(g_('cannot create signature file %s'), $asc);
+        open my $fh_gpg, '-|', 'gpg', @gpg_opts, '-o', '-', '--enarmor', $sig
+            or syserr(g_('cannot execute %s program'), 'gpg');
+        while (my $line = <$fh_gpg>) {
+            next if $line =~ m/^Version: /;
+            next if $line =~ m/^Comment: /;
+
+            $line =~ s/ARMORED FILE/SIGNATURE/;
+
+            print { $fh_asc } $line;
+        }
+
+        close $fh_gpg or subprocerr('gpg');
+        close $fh_asc or syserr(g_('cannot write signature file %s'), $asc);
+
+        return $asc;
+    }
+
+    return;
+}
+
+1;