Allow un-authententicated download access to S3 repository

[LesterTheTester]

Enhancement Suggestion

Allow unauthenticated access to S3 for downloading dependencies

Why would the enhancement be useful to most users

An administrator could setup an S3 bucket that's read-accessible to the public, or under certain ACL conditions (IP, VPC, etc) that do not require AWS credentials. This would allow end users to consume dependencies without needing AWS credentials. At some organizations, AWS credentials are not handed out to everyone (ie, only infrastructure developers).

I'd suggest putting this behind a commandline flag, like --no-creds

[tmspzz]

@LesterTheTester seems like a good idea. Do you want to give it a shot?

[tmspzz]

@LesterTheTester I think it's enough to launch rome like so:

AWS_ACCESS_KEY_ID="" AWS_SECRET_ACCESS_KEY="" rome download

In narrator's voice: "No, it wasn't enough"

[samritchie]

@blender I might have a look at this one. Are you thinking http-conduit and using the command line flag as proposed?

[tmspzz]

@samritchie

If credentials are not discovered when a bucket is defined then an unauthenticated request should be made.

The CLI flag is needed to override the regular behavior when credentials are there. I suggest the flag to be --no-auth

http-conduit to /tmp/some-zip then move to the appropriate location and unpack.

[tmspzz]

@LesterTheTester Thanks to @BalestraPatrick you can now use whatever backend you want, including implementing your own S3 script. #185

[tmspzz]

You can try the pre-release at: https://github.com/blender/Rome/releases/tag/v0.22.0.59