Sonarqube: Missing blame information for the following files

Question

I am getting the warning Missing blame information for the following files during analysis by SonarQube.

[INFO] [22:19:57.714] Sensor SCM Sensor
[INFO] [22:19:57.715] SCM provider for this project is: git
[INFO] [22:19:57.715] 48 files to be analyzed
[INFO] [22:19:58.448] 0/48 files analyzed
[WARN] [22:19:58.448] Missing blame information for the following files:
(snip 48 lines)
[WARN] [22:19:58.449] This may lead to missing/broken features in SonarQube
[INFO] [22:19:58.449] Sensor SCM Sensor (done) | time=735ms

I am using SonarQube 5.5, analysis is done by Maven in a Jenkins job, on a multi-module Java project. Git plugin 1.2 is installed.

Manually running git blame in a bash shell, on any of the offending files, gives an expected output.

Related questions I found were all about SVN, my issue is with Git.

How do I get git blame information on Sonarqube?

Answer 1

The cause was a JGit bug. JGit does not support .gitattributes. I had ident in my .gitattributes. Plain console git checked out the source, applied ident on $Id$ macros, but then JGit ignored that and saw a difference that wasn't committed, where there actually wasn't one.

The friendly people on the SonarQube mailing list helped me out, and suggested debugging with the standalone JGit command line distribution:

chmod +x /where/is/org.eclipse.jgit.pgm-<version>-r.sh
/where/is/org.eclipse.jgit.pgm-<version>-r.sh blame -w /path/to/offending/file

This particular JGit bug has not been solved for over 5 years and I have no hope that it will be solved anytime soon, so I removed the $Id$ macros from all my sources.

This is the (Bash) code I used, to remove all $Id$ macros:

find */src -name "*.java" | xargs -n 1 sed -i '/$Id.*$/d'
find */src -name "*.java" | xargs git add
git commit -m "Remove $Id$ macros"
git push