Support FTP for ISO URLs

[juliandunn]

Some distributions (FreeBSD) only provide FTP URLs to their ISOs and Packer doesn't seem to support this:

$ packer validate freebsd-9.1-amd64.json
Template validation failed. Errors are shown below.

Errors validating build 'virtualbox'. 1 error(s) occurred:

* Failed to parse iso_url 1: Unsupported URL scheme: ftp

Errors validating build 'vmware'. 1 error(s) occurred:

* Failed to parse iso_url 1: Unsupported URL scheme: ftp

[mitchellh]

I'd love to do this, but there is no native Go FTP library at the moment which is kind of a blocker.

[masteinhauser]

It looks to me like there may be support for this now in the goftp library? Quickly reviewing that code it seems to be implemented solely in Golang.

[skoblenick]

+1 for this feature

[arizvisa]

PR #2906 uses jlaffaye's ftp library which is pretty much #1 at http://golanglibs.com. However, if the policy is to re-implement all the protocols that golang doesn't have a stdlib for or that packer doesn't already include, I suppose I can re-invent ftp for that PR to get packer to support ftp urls and resuming.

[WillSquire]

+1. A stumbling block at the first hurdle for me :/

[rrzaripov]

+1 good feature

[vtolstov]

+1, but i'm prefer http it faster then ftp

[chrisandchris]

+1

[nywilken]

Hi there this is a pretty old thread so pardon the noise. But this particular feature request is out of scope for Packer since downloading of ISOs is really the job of hashicorp/go-getter.

There is an accompanying issue on the go-getter project hashicorp/go-getter#220 where this request is being tracked.

I'm going to close this issue on Packer and keep an eye on the go-getter discussion.