When installing an R runtime, Rig fails with the following error:

[INFO] Installing pak for R 4.3.2 (if not installed yet)
[ERROR] Failed to install pak for R 4.3.2: Failed to find user HOME

Currently, we have been able to work around this with the '--without-pak' switch.

The issue arises because of how Rig determines a user's home directory in

The above referenced code attempts to extract the home directory from /etc/passwd. In the Linux environment I am using there is no user entry in /etc/passwd due to the way user logins are managed. To resolve this it would be great if Rig could fallback to using $HOME environment variable if the home directory cannot be extracted from /etc/passwd.

Something like the following should address this:

let user_record = nix::unistd::User::from_uid(ouid)
.or(env::var("HOME"))?
.ok_or(SimpleError::new("Failed to find user HOME))?;