Trying to get HEAD detached at FETCH_HEAD to match AppVeyor

Author: eatdrinksleepcode

.travis.yml

@@ -2,11 +2,24 @@ language: csharp
 solution: src/GitVersion.sln
 sudo: false
 before_install: # We need to download nuget.exe due to: https://github.com/travis-ci/travis-ci/issues/5932
+  - git status
+  - git show-ref HEAD --head
+  - git show HEAD -s
+  - cat .git/HEAD
+  - cat .git/FETCH_HEAD
   - git fetch --unshallow
   - git status
   - git show-ref HEAD --head
   - git show HEAD -s
   - cat .git/HEAD
+  - cat .git/FETCH_HEAD
+  - git fetch origin +refs/pull/890/merge
+  - git checkout -qf FETCH_HEAD
+  - git status
+  - git show-ref HEAD --head
+  - git show HEAD -s
+  - cat .git/HEAD
+  - cat .git/FETCH_HEAD
   - mkdir -p .nuget
   - wget -O .nuget/nuget.exe https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
   - mono .nuget/nuget.exe
@@ -19,6 +32,7 @@ script:
   - git show-ref HEAD --head
   - git show HEAD -s
   - cat .git/HEAD
+  - cat .git/FETCH_HEAD
   - mono ./build/NuGetCommandLineBuild/tools/GitVersion.exe -l console -output buildserver -updateAssemblyInfo
   - xbuild ./src/GitVersion.sln /property:Configuration="Debug" /verbosity:detailed
   - mono ./src/packages/NUnit.ConsoleRunner.3.2.1/tools/nunit3-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll --where "cat != NoMono" --noresult

appveyor.yml

@@ -12,6 +12,7 @@ build_script:
   - cmd: git show-ref HEAD --head
   - cmd: git show HEAD -s
   - cmd: type .git\HEAD
+  - cmd: type .git\FETCH_HEAD
   - cmd: nuget restore src/GitVersion.sln
   - cmd: npm i -g tfx-cli
 
@@ -20,6 +21,7 @@ build_script:
   - cmd: git show-ref HEAD --head
   - cmd: git show HEAD -s
   - cmd: type .git\HEAD
+  - cmd: type .git\FETCH_HEAD
   - ps: .\build\NuGetCommandLineBuild\tools\GitVersion.exe /l console /output buildserver /updateAssemblyInfo
   - cmd: msbuild src/GitVersion.sln "/p:Configuration=%CONFIGURATION%;Platform=%PLATFORM%"