This replication package uses the criteria proposed in On the reproducibility of empirical software engineering studies based on data retrieved from development repositories (Open Access - Empirical Software Engineering, Volume 17, Numbers 1-2, 75-89, 2012), the attributes of this study are given in following table:

Details

• Identification:
  • Git repositories (repos.txt)
  • On-line to developers from the six projects under study (Openstack, Ceph, Linux, MediaWiki, Moodle, WebKit).
• Description:
  • Git repositories
  • Description of the survey (the survey questions are included verbatim in the paper).
• Availability:
  • Git repositories: Public.
  • On-line survey: Partially public. To preserve privacy, an anonymous version is released.
• Persistence: Yes.

Retrieval Methodology

• Identification: CVSAnalY (a previous version of Perceval)
• Description: Tool to parse versioning systems (in particular, log messages).
• Availability: Public
• Persistence: Yes.
• Flexibility: Yes. Released under the GNU GPL v2.0.

• Identification: Survey Creator
• Description: Tool to create an on-line.
• Availability: Public
• Persistence: Yes.
• Flexibility: Yes. Released under the GNU GPL v2.0.

• Identification: openstack_versioning_system_metadata.mysql.gz (13 Mb)
• Description: Meta-data from the repositories.
• Availability: Public.
• Persistence: Yes.
• Flexibility: Yes.

• Identification: Set of Python scripts that extract the relevant information for the study from the Data Source: agregate_activity.py (3,7 KB)
• Description: Script to transform the MySQL dump (see Data Source) into CSV files (see Processed Dataset).
• Availability: Public.
• Persistence: Yes.
• Flexibility: Yes. Released under the GNU GPLv2

• Identification: Date of data retrieval.
• Description: Date when the OpenStack repositories were retrieved: 12 January 2014. Date when the other repositories were retrieved: Early March 2014.

• Identification: Survey dates.
• Description: The survey for OpenStack was opened January 30th 2014 and closed February 2nd 2014. The survey of the other projects opened March 24th 2014 and closed April 15th 2014.

• Identification: Cleaning of the survey.
• Description: Deletions and modifications done on the survey data. Information in survey_cleaning.txt (3 KB).

• Identification:
  • (Anonymized) Survey data (responses after cleaning): answers_survey.public.csv (40 KB)
  • Number of commits per month (*): commits_nobots.zip (114 KB)
  • Number of active days per month (*): activity_nobots.zip (93 KB)
  • List of identifiers for the same author (merging): authors_ids_nobots.zip (48 KB)
• Description: Relevant information for this study is gathered from the raw dataset and included in several CSV files. Bots have been filtered out (the bot ids are referred in the paper). (*) Each row contains monthly for each author starting January 2010 (padding months at the beginning of 2010 and end of 2014 are included). The author_id is not included, but can be obtained from authors_ids_nobots.zip as they are in the same order.
• Availability: Public.
• Persistence: Yes.
• Flexibility: Yes. They are all CSV files.

• Identification: Scripts
• Description: Set of Python scripts used for the analysis. Includes a README file with detailed information. Set of R and Python scripts to create the graphs included in the paper.
• Availability: Public
  • scripts.tar.gz (4,0 KB)
  • graphs.tar.gz (2,1 KB)
• Persistence: Yes.
• Flexibility: Yes. All scripts have been released under the GPL v2.0 or later.

• Identification: Set of files as returned by the scripts used for analysis.
• Description: Structured text files (in general CSV files with the name of the columns given in the first line).
• Availability: Public.
  • results.tar.gz (3,3 KB)
• Persistence: Yes.
• Flexibility: Yes. Provided in easy parseable text files.