How do you extract a version number from nuspec into TeamCity?

Question

How do you extract a version number from nuspec into TeamCity?

We have a csproj file with this corresponding nuspec node:

1.3.2

In TeamCity I'd like to do a build of this project and create a NuGet package with version 1.3.2.%build.counter%. For example, 1.3.2.322. It is important the version number is coming from a file within source control (the NuSpec) and I don't want to duplicate this as a variable in TeamCity. Is there a way to extract 1.3.2 from the NuSpec file and use it as a TeamCity variable?

Extraditable

Answer 1

A couple of approaches I can think of spring to mind, both using TeamCity service messages:

Use a PowerShell build step, something like this (apologies my PS isn't great):

$buildcounter = %build.counter%
$node = Select-Xml -XPath "/package/metadata/version" -Path /path/to/nuspec.nuspec
$version = $node.Node.InnerText
Write-Output "##teamcity[buildNumber '$version.$buildcounter']"

Or, similarly, bootstrap a tool like XmlStarlet:

$buildcounter = "1231"
$version = xml sel -T -t -v "/package/metadata/version" Package.nuspec
Write-Output "##teamcity[buildNumber '$version.$buildcounter']"

This step would need to be added before any other step requiring the build number.

Something

It's also worth noting that your generated version number will not be available for use in the AssemblyInfo build feature, as this will run when the server is fetching changes to build. This has tripped me up before; the only way around it is to chain an upstream build via a snapshot dependency that evaluates the version number. – Something

Answer 2

This approach works with version 10+ of TeamCity and gets around issues with Select-Xml and namespaces.

$Version = ([xml](Get-Content .\MyProject.nuspec)).package.metadata.version
$BuildCounter = %build.counter%

echo "##teamcity[setParameter name='PackageVersion' value='$Version.$BuildCounter']"

Pianoforte

I'm also using this style with AppVeyor by replacing %build.counter% with $env:APPVEYOR_BUILD_NUMBER and calling the choco pack with --version $Version.$BuildCounter. Thanks for the awesome and concise syntax. – Remorse