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guillem pushed a commit to branch master
in repository dpkg.

commit 9dab03c99a64cd15536f153e0705ec16e686c2d5
Author: Guillem Jover <[email protected]>
Date:   Thu Apr 12 05:52:02 2018 +0200

    dpkg-source: Do not emit perl warnings on source formats w/o options
    
    At least the format "3.0 (native)" supports no format specific options,
    which makes the describe_cmdline_options() return an empty list.
---
 debian/changelog       | 2 ++
 scripts/dpkg-source.pl | 1 +
 2 files changed, 3 insertions(+)

diff --git a/debian/changelog b/debian/changelog
index 3542c13..0d4410b 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -57,6 +57,8 @@ dpkg (1.19.1) UNRELEASED; urgency=medium
     using this new protocol, to safely lock the dpkg database w/o risk of
     race conditions with other dpkg instances or frontends supporting the
     same protocol. Thanks to Julian Andres Klode <[email protected]>.
+  * Do not emit perl warnings in dpkg-source --help on source formats w/o
+    options.
   * Architecture support:
     - Add support for riscv64 CPU. Closes: #822914
       Thanks to Manuel A. Fernandez Montecelo <[email protected]>
diff --git a/scripts/dpkg-source.pl b/scripts/dpkg-source.pl
index 5c356c3..107408d 100755
--- a/scripts/dpkg-source.pl
+++ b/scripts/dpkg-source.pl
@@ -578,6 +578,7 @@ sub get_format_help {
     $srcpkg->upgrade_object_type(); # Fails if format is unsupported
 
     my @cmdline = $srcpkg->describe_cmdline_options();
+    return '' unless @cmdline;
 
     my $help_build = my $help_extract = '';
     my $help;

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