[DRE-maint] Bug#786841: generate_or_update_gem_to_package_data: undefined method `invert' for false:FalseClass (NoMethodError)

[Christian Hofstaedtler]

Package: gem2deb
Version: 0.16
Severity: normal

I've been observing the following error while running `gem2deb molinillo`:
-----
molinillo doesn't seem to exist. Let's try to download it with 'gem fetch molinillo'
gem fetch molinillo
Downloaded molinillo-0.2.3
-- Creating source tarball from molinillo-0.2.3.gem ...
tar xfm /home/ch/Debian/pkg-ruby-extras/molinillo-0.2.3.gem
"tar xzfm data.tar.gz"
"zcat metadata.gz > metadata.yml"
tar czf /home/ch/Debian/pkg-ruby-extras/molinillo-0.2.3.tar.gz molinillo-0.2.3
-- Successfully created ./molinillo-0.2.3.tar.gz

-- Creating Debian source package from ./molinillo-0.2.3.tar.gz ...
/usr/lib/ruby/vendor_ruby/gem2deb/dh_make_ruby.rb:145:in `generate_or_update_gem_to_package_data': undefined method `invert' for false:FalseClass (NoMethodError)
	 from /usr/lib/ruby/vendor_ruby/gem2deb/dh_make_ruby.rb:64:in `initialize'
	 from /usr/bin/gem2deb:96:in `new'
	 from /usr/bin/gem2deb:96:in `<main>'
-----

A bit of debugging suggests that this happens because my apt-file cache
was empty, and then apt-file search returns an empty result, yielding
an invalid YAML file (after the sed processing), causing YAML.load
on dh_make_ruby.rb:145 to return false.

Maybe a check for false or a too-small cache file could be added
in generate_or_update_gem_to_package_data.

AFAICT, the version in jessie is also affected by this.

Best,
C.


-- System Information:
Debian Release: 8.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'buildd-experimental'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gem2deb depends on:
ii  build-essential      11.7
ii  debhelper            9.20150101
ii  devscripts           2.15.3
ii  gem2deb-test-runner  0.16
ii  perl                 5.20.2-3
ii  python3-debian       0.1.27
ii  ruby                 1:2.1.5+1
ii  ruby-all-dev         1:2.1.5+1
ii  ruby-setup           3.4.1-7

Versions of packages gem2deb recommends:
ii  apt-file  2.5.4

gem2deb suggests no packages.

-- no debconf information