title: SonarQube Scanner fails with “Not inside a git worktree” error
body: <p>I'm using Travis CI to run SonarQube Scanner on a <code>C#</code> project. I've managed to get the scanner to work once but it failed with no obvious reason on the next commit (the commit updated <code>README.md</code>).</p>
  <p>I've tried to clear the build cache, with no success. I've also read about the issue in other programming languages (Java mainly) but no luck so far.</p>
  <h2>Error log</h2>
  <p>The specific error is:</p>
  <p><code>Not inside a Git work tree: /home/travis/build/presque-fini</code></p>
  <p>The full error log is below:</p>
  <pre><code>34.72s$ mono ./scanner/SonarScanner.MSBuild.exe end -d:sonar.login=&quot;tkoen&quot;
  SonarScanner for MSBuild 4.9
  Using the .NET Framework version of the Scanner for MSBuild
  Post-processing started.
  WARNING: The following projects do not have a valid ProjectGuid and were not built using a valid solution (.sln) thus will be skipped from analysis...
  /home/travis/build/presque-fini/nez/Nez.Portable/Nez.csproj
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x86/SDL2.dll' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x64/SDL2.dll' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x86/soft_oal.dll' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x64/soft_oal.dll' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x86/libSDL2-2.0.so.0' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x64/libSDL2-2.0.so.0' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x86/libopenal.so.1' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/x64/libopenal.so.1' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/libSDL2-2.0.0.dylib' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/libopenal.1.dylib' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  WARNING: File '/usr/lib/mono/xbuild/MonoGame/v3.0/Assemblies/DesktopGL/MonoGame.Framework.dll.config' is not located under the root directory '/home/travis/build/presque-fini' and will not be analyzed.
  The SONAR_SCANNER_HOME environment variable is not required and will be ignored.
  Calling the SonarQube Scanner...
  INFO: Scanner configuration file: /home/travis/build/presque-fini/presque-game/scanner/sonar-scanner-4.3.0.2102/conf/sonar-scanner.properties
  INFO: Project root configuration file: /home/travis/build/presque-fini/presque-game/.sonarqube/out/sonar-project.properties
  INFO: SonarScanner 4.3.0.2102
  INFO: Java 11.0.2 Oracle Corporation (64-bit)
  INFO: Linux 4.15.0-1028-gcp amd64
  INFO: User cache: /home/travis/.sonar/cache
  INFO: Scanner configuration file: /home/travis/build/presque-fini/presque-game/scanner/sonar-scanner-4.3.0.2102/conf/sonar-scanner.properties
  INFO: Project root configuration file: /home/travis/build/presque-fini/presque-game/.sonarqube/out/sonar-project.properties
  INFO: Analyzing on SonarCloud
  INFO: Default locale: &quot;en_US&quot;, source code encoding: &quot;UTF-8&quot; (analysis is platform dependent)
  INFO: Load global settings
  INFO: Load global settings (done) | time=706ms
  INFO: Server id: 1BD809FA-AWHW8ct9-T_TB3XqouNu
  INFO: User cache: /home/travis/.sonar/cache
  INFO: Load/download plugins
  INFO: Load plugins index
  INFO: Load plugins index (done) | time=165ms
  INFO: Load/download plugins (done) | time=22322ms
  INFO: Loaded core extensions: developer-scanner
  INFO: Process project properties
  INFO: Execute project builders
  INFO: Execute project builders (done) | time=49ms
  INFO: Project key: presque-fini_presque-game
  INFO: Base dir: /home/travis/build/presque-fini
  INFO: Working dir: /home/travis/build/presque-fini/presque-game/.sonarqube/out/.sonar
  INFO: Load project settings for component key: 'presque-fini_presque-game'
  INFO: Load project settings for component key: 'presque-fini_presque-game' (done) | time=227ms
  INFO: Found an active CI vendor: 'TravisCI'
  INFO: Load project branches
  INFO: Load project branches (done) | time=136ms
  INFO: Check ALM binding of project 'presque-fini_presque-game'
  INFO: Detected project binding: BOUND
  INFO: Check ALM binding of project 'presque-fini_presque-game' (done) | time=122ms
  INFO: Load project pull requests
  INFO: Load project pull requests (done) | time=141ms
  INFO: Load branch configuration
  INFO: Load branch configuration (done) | time=4ms
  INFO: Load quality profiles
  INFO: Load quality profiles (done) | time=156ms
  INFO: Load active rules
  INFO: Load active rules (done) | time=3676ms
  INFO: Organization key: presque-fini
  INFO: Indexing files...
  INFO: Project configuration:
  INFO: ------------------------------------------------------------------------
  INFO: EXECUTION FAILURE
  INFO: ------------------------------------------------------------------------
  INFO: Total time: 33.193s
  INFO: Final Memory: 7M/27M
  INFO: ------------------------------------------------------------------------
  ERROR: Error during SonarScanner execution
  ERROR: Not inside a Git work tree: /home/travis/build/presque-fini
  ERROR: 
  The SonarQube Scanner did not complete successfully
  13:29:46.773  Post-processing failed. Exit code: 1
  The command &quot;mono ./scanner/SonarScanner.MSBuild.exe end -d:sonar.login=&quot;token&quot;&quot; exited with 1.
  </code></pre>
  <h2>System config</h2>
  <ul>
  <li>CI: Travis (you can browse the full build here: <a href="https://travis-ci.com/github/presque-fini/presque-game/builds/172666297" rel="nofollow noreferrer">https://travis-ci.com/github/presque-fini/presque-game/builds/172666297</a>)</li>
  <li>OS: Ubuntu 16.04.6 LTS</li>
  <li>Git 2.21.0</li>
  <li>Versions used: <code>sonar-scanner-msbuild-4.9.0.17385-net46</code></li>
  <li>Scanner command: <code>mono ./scanner/SonarScanner.MSBuild.exe end -d:sonar.login=&quot;token&quot;</code></li>
  <li>Project hosted on Github (<a href="https://github.com/presque-fini/presque-game" rel="nofollow noreferrer">https://github.com/presque-fini/presque-game</a>)</li>
  </ul>