paket.targets using MSBuildThisFileDirectory https://github.com/fsprojects/Paket/issues/172

paket.targets

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">$(MSBuildProjectDirectory)\..\</SolutionDir>

    <!-- Enable the restore command to run before builds -->
    <RestorePackages Condition="  '$(RestorePackages)' == '' ">true</RestorePackages>

    <!-- Download Paket.exe if it does not already exist -->
    <DownloadPaket Condition=" '$(DownloadPaket)' == '' ">true</DownloadPaket>
  </PropertyGroup>

  <PropertyGroup Condition=" '$(OS)' == 'Windows_NT'">
    <!-- Windows specific commands -->
    <!--<PaketToolsPath>$([System.IO.Path]::Combine($(SolutionDir), ".paket"))</PaketToolsPath>-->
    <PaketToolsPath>$(MSBuildThisFileDirectory)</PaketToolsPath>
  </PropertyGroup>

  <PropertyGroup Condition=" '$(OS)' != 'Windows_NT'">
    <!-- We need to launch paket.exe with the mono command if we're not on windows -->
    <PaketToolsPath>$(SolutionDir).paket</PaketToolsPath>
  </PropertyGroup>

  <PropertyGroup>
    <!-- Paket command -->
    <PaketExePath Condition=" '$(PaketExePath)' == '' ">$(PaketToolsPath)paket.exe</PaketExePath>
    <PaketBootStrapperExePath Condition=" '$(PaketBootStrapperExePath)' == '' ">$(PaketToolsPath)paket.bootstrapper.exe</PaketBootStrapperExePath>

    <PaketCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketExePath)"</PaketCommand>
    <PaketCommand Condition=" '$(OS)' != 'Windows_NT' ">mono --runtime=v4.0.30319 $(PaketExePath)</PaketCommand>

    <PaketBootStrapperCommand Condition=" '$(OS)' == 'Windows_NT'">"$(PaketBootStrapperExePath)"</PaketBootStrapperCommand>
    <PaketBootStrapperCommand Condition=" '$(OS)' != 'Windows_NT' ">mono --runtime=v4.0.30319 $(PaketBootStrapperExePath)</PaketBootStrapperCommand>

    <!-- Commands -->
    <RestoreCommand>$(PaketCommand) install</RestoreCommand>
    <DownloadPaketCommand>$(PaketBootStrapperCommand) </DownloadPaketCommand>

    <!-- We need to ensure packages are restored prior to assembly resolve -->
    <BuildDependsOn Condition="$(RestorePackages) == 'true'">
      RestorePackages;
      $(BuildDependsOn);
    </BuildDependsOn>
  </PropertyGroup>

  <Target Name="CheckPrerequisites">
    <!-- Raise an error if we're unable to locate paket.exe  -->
    <Error Condition="'$(DownloadPaket)' != 'true' AND !Exists('$(PaketExePath)')" Text="Unable to locate '$(PaketExePath)'" />
    <!--
        Take advantage of MsBuild's build dependency tracking to make sure that we only ever download paket.exe once.
        This effectively acts as a lock that makes sure that the download operation will only happen once and all
        parallel builds will have to wait for it to complete.
        -->
    <MsBuild Targets="DownloadPaket" Projects="$(MSBuildThisFileFullPath)" Properties="Configuration=NOT_IMPORTANT;DownloadPaket=$(DownloadPaket)" />
  </Target>

  <Target Name="DownloadPaket">
    <Exec Command="$(DownloadPaketCommand)" Condition=" '$(DownloadPaket)' == 'true' AND !Exists('$(PaketExePath)')" />
  </Target>

  <Target Name="RestorePackages" DependsOnTargets="CheckPrerequisites">
    <Exec Command="$(RestoreCommand)"
          WorkingDirectory="$(SolutionDir)" />
  </Target>

</Project>