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Question

on <https www pantsbuild org docs rules api installing tools|installing tools> there seems to be a couple of options where pex seems to use some internals gt There is a predefined rule to go from PexProcess gt Process so Get ProcessResult Process will cause the engine to run PexProcess gt Process gt ProcessResult is it possible to create your own external tool installer which runs a specific command to get the environment correctly setup similar to the pex machinery and `PexRequest` `PexProcess`

hundreds-father-404 · Answer

Yep for sure See `GoSdkProcess` for example You basically define a data class that has all the values you want your rules to give and then write a helper rule going from `MyCustomProcess gt Process` That s it

freezing-lamp-12123 · Answer

oh that sounds easy enough thank you for the pointer

hundreds-father-404 · Answer

Out of curiosity what tool do you want to support

hundreds-father-404 · Answer

Also the install via this tool part is usually modeled as a different set of helper types and rules That would be the `Get Pex PexRequest ` stuff for example Often that is used to form part of the `input digest` for the `MyCustomProcess` part In other words one step is a how do I install this tool and then b how do I invoke this tool in a Process

freezing-lamp-12123 · Answer

yup got it this is for my `nix` spelunking