Support for multiple `private_network` adapters

[mefellows]

Given the following Vagrant setup, vagrant-hostsupdater produces an invalid /etc/hosts file where different hostnames need to be bound to different IP addresses within the guest:

  ip_address_au = "10.0.0.28"
  ip_address_nz = "10.0.0.29"
  config.vm.network "private_network", ip: ip_address_nz
  config.vm.network "private_network", ip: ip_address_au

  if Vagrant.has_plugin?("vagrant-hostsupdater")
    config.hostsupdater.aliases = ["foo.com", "bar.com"}
  end
  ...

The /etc/hosts file will look something like:

10.0.0.28  foo.com  # VAGRANT: 76d2a8f38ca5dad7d0414a3dc013813c (default) / 234b3f77-7624-4b98-8ce1-5560abeb4ff7
10.0.0.28  bar.com  # VAGRANT: 76d2a8f38ca5dad7d0414a3dc013813c (default) / 234b3f77-7624-4b98-8ce1-5560abeb4ff7
10.0.0.29  foo.com  # VAGRANT: 72750f9e895980fb84e2792fd10a90f3 (default) / 5571d2f0-bb3e-4897-b151-394a8db63b05
10.0.0.29  foo.com  # VAGRANT: 72750f9e895980fb84e2792fd10a90f3 (default) / 5571d2f0-bb3e-4897-b151-394a8db63b05b

It would be great if support for mapping IPs to hostnames were added:

e.g. a syntax something like:

    config.hostsupdater.aliases = {ip_address_au => ["foo.com"], ip_address_nz => ["bar.com"]}

would produce a hosts file like:

10.0.0.28  foo.com  # VAGRANT: 76d2a8f38ca5dad7d0414a3dc013813c (default) / 234b3f77-7624-4b98-8ce1-5560abeb4ff7
10.0.0.29  bar.com  # VAGRANT: 72750f9e895980fb84e2792fd10a90f3 (default) / 5571d2f0-bb3e-4897-b151-394a8db63b05b

[chuckd]

@mefellows we have exactly the same requirement, down to separate IPs for AU and NZ :). Would be grateful if you got a chance to craft up a suitable PR, otherwise I'll have a go based on your work.

[mefellows]

Hi @chuckd, take a look at https://github.com/SEEK-Jobs/vagrant-multi-hostsupdater. We use it a SEEK and it works nicely.

There is an old PR for this project but there hasn't been any activity in a while.

[chuckd]

Ah, nice, thanks @mefellows, looks perfect, I'll give that a go.

[cgsmith]

Hi @mefellows! This looks like it would be a good addition and I can definitely see the need for this as @chuckd does.

Would you be willing to resubmit a PR branched from or submitted to develop ?

[mefellows]

Hi @cgsmith - sorry I don't know how I missed this! I'll take a look at the fork and see what I can do. Given this has good visibility it would be nice to contribute back.

[maximerety]

Hi guys!

I would also really like to see this feature land, so I resubmitted a PR branched from develop: #96

The code is slightly different from @mefellows' commit to handle config.vm.hostname as before, even when a hash of aliases is given (and does not contain an alias with the same host), i.e.

config.vm.network :private_network, ip: "10.0.0.28"
config.vm.network :private_network, ip: "10.0.0.29"

# example 1:
config.vm.hostname = "dev.host.com"
config.hostsupdater.aliases = { "10.0.0.29" => "ftp.host.com" }
# in /etc/hosts: 
#   10.0.0.28       dev.host.com
#   10.0.0.29       dev.host.com
#   10.0.0.29       ftp.host.com

# example 2:
config.vm.hostname = "dev.host.com"
config.hostsupdater.aliases = { "10.0.0.28" => "dev.host.com", "10.0.0.29" => "ftp.host.com" }
# in /etc/hosts: 
#   10.0.0.28       dev.host.com
#   10.0.0.29       ftp.host.com

The original behavior is not changed when an array is given for the aliases option.

The comments in README.md have been shamelessly stolen from @mefellows' PR.

I hope this can help.

[cgsmith]

This has been merged in and is part of the release.