Scripting NuPkg Reference Changes for Testing

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I was testing out some changes to versioning in Autofac. We have a MyGet feed, but all of the internal dependencies of the various NuGet packages when they’re built point to the CI versions, so it’s sort of hard to stage a test of what things will look like when they’re released – you have to rename each .nupkg file to remove the “-CI-XYZ” build number, open each .nupkg file, change the internal .nuspec file to remove the “-CI-XYZ” build number info, then re-zip everything up. In testing, I had to do this a few times, so I scripted it.

I put everything in a folder structure like this:

  • ~/TestFeed
    • backup – contains all of the original .nupkg files (renamed without the “-CI-XYZ”)
    • msbuildcommunitytasks – contains the MSBuild Community Tasks set

Then I wrote up a quick MSBuild script for doing all the extract/update/rezip stuff. I could have used any other scripting language, but, eh, the batching and file scanning in MSBuild made a few things easy.

msbuild fixrefs.proj /t:Undo puts the original packages (from the backup folder) into the test feed folder.

msbuild fixrefs.proj Does the zip/fix/re-zip.

One of the challenges I ran into was that the zip task in MSBuild Community Tasks seemed to always want to add an extra level of folders into the .nupkg – I couldn’t get the original contents to live right at the root of the package. Rather than fight it, I used 7-Zip to do the re-zipping. I probably could have gotten away from the MSBuild Community Tasks entirely had I some form of sed on my machine because I needed that FileUpdate task. But… Windows. And, you know, path of least resistance. I think this was a five-minute thing. Took longer to write this blog entry than it did to script this.

Here’s “fixrefs.proj”:

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="All" xmlns="" ToolsVersion="4.0">
    <SevenZip>C:\Program Files\7-Zip\7z.exe</SevenZip>
  <Import Project="$(MSBuildProjectDirectory)\msbuildcommunitytasks\MSBuild.Community.Tasks.Targets"/>
    <Package Include="*.nupkg"/>
  <Target Name="All">
    <MakeDir Directories="%(Package.Filename)" />
    <Unzip ZipFileName="%(Package.FullPath)" TargetDirectory="%(Package.Filename)" />
      <NuSpec Include="**/*.nuspec" />
    <FileUpdate Files="@(NuSpec)" Regex="(.)\-CI\-\d+" ReplacementText="$1" WarnOnNoUpdate="true" />
    <Delete Files="@(Package)" />
    <CallTarget Targets="ZipNewPackage" />
    <RemoveDir Directories="%(Package.Filename)" />
  <Target Name="Undo">
    <Delete Files="@(Package)" />
      <Original Include="backup/*.nupkg" />
    <Copy SourceFiles="@(Original)" DestinationFolder="$(MSBuildProjectDirectory)" />
  <Target Name="ZipNewPackage" Inputs="@(Package)" Outputs="%(Identity).Dummy">
      Command="&quot;$(SevenZip)&quot; a -tzip &quot;$(MSBuildProjectDirectory)\%(Package.Filename)%(Package.Extension)&quot;"
      WorkingDirectory="$(MSBuildProjectDirectory)\%(Package.Filename)" />