Add support to mount Linux host homedir

[chantra]

Fixes #1085

[SvenDowideit]

I like the approach - nice. concept LGTM

[pirog]

This works reliably on Debian 8, Ubuntu 14.04 and Fedora 23

[SvenDowideit]

@tianon @JeffDM is this going to make kitematic on Linux happier too?

[Godin]

This works like a charm with docker-machine 0.5.2 ( which includes docker/machine#2122 ). Is there chance to get this in release?

[tbfangel]

I just tested this on Ubuntu 15.10 with the very latest boot2docker RC image v1.10.0-rc3 and docker-machine v0.6.0-rc3 and it's working in that setup.

[atomi]

This PR has not been merged. I just tested Linux shares on Linux Mint 17.3 using the new docker-machine v0.6.0 and the new boot2docker v1.10.0. - So you'll have to build your own boot2docker images to get Linux shares working which is a shame because they are very useful if you're testing configuration files quickly on a local setup.

[atomi]

I'm tracking this repo with this PR merged over at https://github.com/atomi/boot2docker/releases for anyone interested.

[tianon]

As a Linux user myself, I like the sentiment here, but I'm not too keen on introducing more discrepancies (especially more hard-coded assumptions) in the mounts here from the host OS unless we can do it universally somehow (ie, mount under /mnt/Users etc instead of directly in /). For that reason, I'd say I'm more partial to the implementation in #1088, which would allow us to share /home/tianon directly instead of trying to share all of /home (or directories even more specific than that like /home/tianon/dev/project). Additionally, this would put the control for "where to mount" in the hands of the tool orchestrating the boot2docker VM (or the operator in charge of configuring it).

[tianon]

Closing since #1088 merged (a while ago 😇 😅 ) -- thanks for the contribution!