Compute hash of git and CRAN archive packages locally if nix is installed

[b-rodrigues]

WIP

Kinda works, but snapshot tests for rix/ don't pass anymore, and weirdly enough it seems unrelated

[philipp-baumann]

> devtools::load_all(".")
ℹ Loading rix
> url <- paste0("https://github.com/rap4all/housing/", "archive/",
+   "1c860959310b80e67c41f7bbdc3e84cef00df18e", ".tar.gz")
> 
> hash_url(url = url)
$sri_hash
[1] "sha256-s4KGtfKQ7hL0sfDhGb4BpBpspfefBN6hf+XlslqyEn4="

$deps
[1] "dplyr ggplot2 janitor purrr readxl rlang rvest stringr tidyr"

[philipp-baumann]

Todos

• Remove git2r
• add an option via options(rix.sri_hash) to demand local or remote hashing of url resources. Possible values are "locally" and "api_server".One should have the option to choose a plumber API server hashing or do the same locally when nix is installed.
• Redesign the interface

[b-rodrigues]

The default behavior should be to hash locally if nix-hash is present, otherwise use the online service and add message to inform the user, what do you think ?

[philipp-baumann]

NixOS/nix#7690