Metric_fu - invalid byte sequence in UTF-8

Question

Everyday at the end of the day, I run metric_fu in a RoR environment to measure the code quality. Everything worked fine until today...

When I try to run metric_fu, this is my result since today.

$ bundle exec metric_fu -r
F, [2013-05-10T17:11:45.980014 #26798] FATAL -- : invalid byte sequence in UTF-8 (ArgumentError)
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/git_analyzer.rb:16:in `split'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/git_analyzer.rb:16:in `get_diff'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/source_control.rb:37:in `get_updated_files_from_log'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/source_control.rb:11:in `get_updated_files_change_info'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:250:in `parse_logs_for_updated_files'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:177:in `calculate_revision_data'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:165:in `block in calculate_revision_changes'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:160:in `each'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:160:in `calculate_revision_changes'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:59:in `analyze'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/lib/churn/churn_calculator.rb:44:in `report'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/bin/churn:32:in `report_churn'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/bin/churn:40:in `run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/main-5.2.0/lib/main/program/class_methods.rb:155:in `block in run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/main-5.2.0/lib/main/program/class_methods.rb:144:in `catch'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/main-5.2.0/lib/main/program/class_methods.rb:144:in `run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/main-5.2.0/lib/main/factories.rb:18:in `run'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/main-5.2.0/lib/main/factories.rb:25:in `Main'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/churn-0.0.28/bin/churn:6:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/bin/mf-churn:11:in `load'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/bin/mf-churn:11:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/mf-churn:19:in `load'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/mf-churn:19:in `<main>'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
/usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/metrics/churn/churn.rb:10:in `analyze': undefined method `match' for nil:NilClass (NoMethodError)
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/metrics/generator.rb:129:in `block in generate_report'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/metrics/generator.rb:127:in `each'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/metrics/generator.rb:127:in `generate_report'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/reporting/report.rb:63:in `add'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/run.rb:25:in `block in run_reports'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/run.rb:23:in `each'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/run.rb:23:in `run_reports'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/run.rb:10:in `run'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/cli/helper.rb:11:in `run'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/lib/metric_fu/cli/client.rb:18:in `run'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/metric_fu-4.1.2/bin/metric_fu:9:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/metric_fu:19:in `load'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/metric_fu:19:in `<main>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `<main>'

I found an similar question here: https://github.com/jscruggs/metric_fu/issues/61. As a result of the question at GitHub, I created a file named '.metrics' in the root directory of my project, with the following content:

MetricFu::Configuration.run do |config|   
  config.syntax_highlighting = false
end

Unfortunately this didn't work.

Nothing, except code, has been updated the last few days, this is why is it weird that this error suddenly occurs.

This is my Ruby version:

$ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.0]

Thanks in advance!

Edit

It is possible to bypass the issue by disabling churn. You can disable churn by adding --no-churn, like this:

$ metric_fu -r --no-churn

Edit 2

Since I added --no-churn once, Metric_fu is fully operational again. Even with Churn activated in the next reports while the same code has been analyzed.

Issue on Github has been created: https://github.com/metricfu/metric_fu/issues/70

Answer 1

Please enter an issue on the metric_fu issues page (you had the link to the old repo there). Based on the stack trace, this might actually be an issue in Churn (that metric_fu is not handling). Please also check out my how to write a bug report page I'll work with you on the bug there.

Answer 2

Interesting I haven't run into that any other details on the project or file it is crashing on? I could try to debug this in churn, but don't have a lot to go off. You can file the metric_fu issue or a issue with churn directly. I follow both projects so I would try to follow up in either case.