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`make ensure &amp;&amp; make install_all` although I doubt you can sensibly do this without network access.

Between go mod downloads, nupkg refreshes, and npm node_package installs you need network connectivity to build

Is there no way to perform the fetching and verification of remote resources before executing arbitrary code ?

Probably, you could go to the right folders and run things like "go mod download" "npm install" etc to fill in caches, then build after that but this isn't something our Makefile build system is trying to solve

Is there any documentation around how to build the software ?

<https://github.com/pulumi/pulumi/blob/master/CONTRIBUTING.md#developing>