[help] Examples of content adressable storage with AWS?

[Aariq]

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Description

I'm wondering if anyone (E.g. @noamross) has any examples of using tar_repository_cas() to use CAS with S3 buckets? I am hoping to test it as a workaround to get S3 storage working for geotargets where the download function would just return a path that terra::rast() could use directly rather than actually downloading the object (#1367). However, I don't know how to write the other required functions and I'm hoping to find some working examples to build off of.

[wlandau]

CAS in targets is new enough that I am not aware of any S3 examples, but you could borrow from the utility functions in https://github.com/ropensci/targets/blob/main/R/utils_aws.R to implement one.