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Looks like environment variables cannot be used in pants.toml. Mine has a path that is specific to my laptop :

`[python-repos]`
`repos.add = ["file:///home/greg/Work/mesh/mesh-dash/packages"]`

What are my options to make this generic?

Indeed. See <https://github.com/pantsbuild/pants/issues/10399>

Pants will interpolate the special strings `"%(homedir)s"`, and same with buildroot and user

```repos.add = ["%(homedir)s/mesh/mesh-dash/packages"]```

The alternative is using Pants env vars, e.g. having users set up a pantsrc file. See the global option `--pantsrc-files`

But also, unless Pants is doing too much processing, you can simply:
```repos.add = ["~/mesh/mesh-dash/packages"]```
Pants hands off to Pex and Pex does no processing and Pip handles this just fine.