@rem This is a batch file to maneuver the limitaion of the max path length which nuget.exe can handle.
@rem 
@rem It is designed to use in a Jenkins Job because it relies on BUILD_TAG variable.
@rem If you want to use this outside of Jenkins, you need to choose an alternative unique id.
@rem
@rem 1. Create an unique path name for the next step.
@rem 2. Create a unique and temporary junction for very long path directory. 
@rem   (The path length of the temporary junction must be short enough.)
@rem 3. move to the directory of the junction.
@rem 4. remove all packages directories recursively. (not mandatory)
@rem 5. run 'nuget.exe restore' for all solution files recursively.
@rem 6. move to the original directory.
@rem 7. remove the temporary junction.

@echo off
set RET=1
@rem You may want to change the path of nuget.exe
set NUGET_PATH=C:\Program Files (x86)\NuGet\nuget.exe

@rem check environment variable of Jenkins
if "%BUILD_TAG%" == "" (
	echo BUILD_TAG is empty
	exit /b 1
)

@rem the parent directory of a temporary junction
@rem you may want to tweak this.
set WA_ROOT=C:\Windows\Temp

@rem path to temporary junction
@rem change this path if you need to.
@rem 
@rem BUILD_TAG and EXECUTOR_NUMBER are defined by Jenkins.
@rem see https://wiki.jenkins.io/display/JENKINS/Building+a+software+project
@rem 
set WA_TARGET=%WA_ROOT%\%BUILD_TAG%-%EXECUTOR_NUMBER%

@rem save current directory
set CURRENT=%CD%

@rem workspace directory which is the target directory of the junction
set WA_SOURCE=%CURRENT%

@rem create a temporary junction
@rem This is the first core of this workaround.
echo mklink /j "%WA_TARGET%" "%WA_SOURCE%"
     mklink /j "%WA_TARGET%" "%WA_SOURCE%"          || goto END

@rem move to the junction directory to avoid the limitation of nuget.exe.
@rem This is the second core of this workaround.
cd /d %WA_TARGET%                                   || goto END

@rem this is optional.
@rem If you don't need to remove packages directory in advance, disable or remove this.
for /r %%i in (packages) do (
	if exist %%i (
		echo rmdir /s /q %%i
		     rmdir /s /q %%i
	)
)

@rem run 'nuget.exe restore' recursively.
for /r %%i in (*.sln) do (
	if exist %%i (
		echo "%NUGET_PATH%" restore %%i
		     "%NUGET_PATH%" restore %%i || goto END
	)
)

@rem set return code
set RET=0

:END
@rem get back to the original directory.
cd /d %CURRENT%

@rem remove the temporary junction
echo rmdir %WA_TARGET%
     rmdir %WA_TARGET%

@rem return result
exit /b %RET%