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+= vagrant-sshfs
+:toc:
+:toc-placement!:
+
+This Vagrant plugin adds synced folder support for mounting
+folders from the Vagrant host into the Vagrant guest via
+https://github.com/libfuse/sshfs[SSHFS]. In the default mode it does
+this by executing the `SSHFS` client software within the guest, which
+creates an SSH connection from the Vagrant guest back to the Vagrant
+host.
+
+'''
+toc::[]
+'''
+[[considerations]]
+== Considerations
+
+The benefits of this approach: - Works on any host platform and
+hypervisor type - Windows, Linux, Mac OS X - Virtualbox, Libvirt,
+Hyper-V, VMWare - Seamlessly works on remote Vagrant solutions - Works
+with vagrant aws/openstack/etc.. plugins
+
+The drawbacks with this approach: - Performance is worse than an
+implementation like NFS - There must be `sftp-server` software on the
+Vagrant host
+
+`sftp-server` is usually provided by SSH server software so it already
+exists on Linux/Mac. On windows you only need to install
+https://cygwin.com/cgi-bin2/package-grep.cgi?grep=openssh&arch=x86_64[openssh]
+via https://cygwin.com/[cygwin] and you will get `sftp-server`.
+
+
+[[history]]
+== History
+
+The inspiration for this plugin came from
+https://github.com/fabiokr[Fabio Kreusch] and his
+https://github.com/fabiokr/vagrant-sshfs[code] for the original
+vagrant-sshfs Vagrant plugin. The goal of this plugin (as opposed to the
+old implementation) is to implement SSHFS as a synced folder plugin just
+like the other synced folder plugins (NFS/RSYNC/SMB/VirtualBox).
+
+This plugin was developed mainly by copying the code from the NFS synced
+folder plugin from the Vagrant core code and molding it to fit SSHFS.
+
+[[modes-of-operation]]
+== Modes of Operation
+
+[[sharing-vagrant-host-directory-to-vagrant-guest---98-of-users]]
+=== Sharing Vagrant Host Directory to Vagrant Guest - 98% of users
+
+This plugin uses SSHFS slave mounts (see
+https://github.com/dustymabe/vagrant-sshfs/issues/11[link]) to mount a
+directory from the Vagrant Host into the Vagrant Guest. It uses the
+`sftp-server` software that exists on the host and `sshfs` running in
+_slave mode_ within the guest to create a connection using the existing
+authentication over SSH that vagrant sets up for you.
+
+[[sharing-arbitrary-host-directory-to-vagrant-guest---1-of-users]]
+=== Sharing Arbitrary Host Directory to Vagrant Guest - 1% of users
+
+This plugin allows you to share a folder from an arbitrary host to the
+Vagrant Guest. This would allow you to do a folder mount to some other
+host that may have files that you need. To do this the plugin will run
+an SSHFS command from the Guest and connect to the arbitrary host that
+must have an SSH daemon running. You must provide the `ssh_host` option
+in the Vagrantfile to get this to work. You can use ssh key forwarding
+or username/password for authentication for this.
+
+See link:#options-specific-to-arbitrary-host-mounting[Options] and
+link:#appendix-a-using-keys-and-forwarding-ssh-agent[Appendix A] for
+more information.
+
+[[sharing-vagrant-guest-directory-to-vagrant-host---1-of-users]]
+=== Sharing Vagrant Guest Directory to Vagrant Host - 1% of users
+
+_NOTE:_ This option is dangerous as data will be destroyed upon
+`vagrant destroy`
+
+This plugin allows you to share a folder from a Vagrant guest into the
+host. If you have workloads where there are a lot of disk intensive
+operations (such as compilation) it may be ideal to have the files live
+in the guest where the disk intensive operations would occur. For
+discussion see https://github.com/dustymabe/vagrant-sshfs/issues/7[Issue
+#7].
+
+See link:#options-specific-to-reverse-mounting-guest-host-mount[Options]
+for more information on how to enable this type of mount.
+
+[[getting-started]]
+== Getting Started
+
+In order to use this synced folder implementation perform the following
+steps:
+
+[[install-plugin]]
+=== Install Plugin
+
+In order to install the plugin simply run the following command:
+
+....
+# vagrant plugin install vagrant-sshfs
+....
+
+[[add-sshfs-synced-folder-in-vagrantfile]]
+=== Add SSHFS Synced Folder in Vagrantfile
+
+Edit your Vagrantfile to specify a folder to mount from the host into
+the guest:
+
+....
+config.vm.synced_folder "/path/on/host", "/path/on/guest", type: "sshfs"
+....
+
+Now you can simply `vagrant up` and your folder should be mounted in the
+guest. For more options that you can add see the link:#options[Options]
+section.
+
+[[executing-the-vagrant-sshfs-command]]
+== Executing the `vagrant sshfs` Command
+
+The Vagrant SSHFS plugin also supports execution of the `vagrant sshfs`
+command from the command line. Executing this command with the `--mount`
+option will iterate through the Vagrant file and attempt to mount (via
+SSHFS) any folders that aren't already mounted in the Vagrant guest.
+Executing with the `--unmount` option will unmount any mounted folders.
+
+....
+vagrant sshfs [--mount|--unmount] [vm-name]
+....
+
+[[options]]
+== Options
+
+The SSHFS synced folder plugin supports a few options that can be
+provided in the `Vagrantfile`. The following sections describe the
+options in more detail.
+
+[[generic-options]]
+=== Generic Options
+
+The SSHFS synced folder plugin supports a few options that can be
+provided in the `Vagrantfile`. They are described below:
+
+* `disabled`
+** If set to 'true', ignore this folder and don't mount it.
+* `ssh_opts_append`
+** Add some options for the ssh connection that will be established.
+** See the ssh man page for more details on possible options.
+* `sshfs_opts_append`
+** Add some options for the sshfs fuse mount that will made
+** See the sshfs man page for more details on possible options.
+
+An example snippet from a `Vagrantfile`:
+
+....
+config.vm.synced_folder "/path/on/host", "/path/on/guest",
+    ssh_opts_append: "-o Compression=yes -o CompressionLevel=5",
+    sshfs_opts_append: "-o auto_cache -o cache_timeout=115200",
+    disabled: false, type: "sshfs"
+....
+
+[[options-specific-to-arbitrary-host-mounting]]
+=== Options Specific to Arbitrary Host Mounting
+
+The following options are only to be used when
+link:#sharing-arbitrary-host-directory-to-vagrant-guest---1-of-users[sharing
+an arbitrary host directory] with the guest. They will be ignored
+otherwise:
+
+* `ssh_host`
+** The host to connect to via SSH. If not provided this will be detected
+as the Vagrant host that is running the Vagrant guest.
+* `ssh_port`
+** The port to use when connecting. Defaults to port 22.
+* `ssh_username`
+** The username to use when connecting. If not provided it is detected
+as the current user who is interacting with Vagrant.
+* `ssh_password`
+** The password to use when connecting. If not provided and the user is
+not using SSH keys, then the user will be prompted for the password.
+Please use SSH keys and don't use this option!
+* `prompt_for_password`
+** The user can force Vagrant to interactively prompt the user for a
+password by setting this to 'true'. Alternatively the user can deny
+Vagrant from ever prompting for the password by setting this to 'false'.
+
+An example snippet from a `Vagrantfile`:
+
+....
+config.vm.synced_folder "/path/on/host", "/path/on/guest",
+    ssh_host: "somehost.com", ssh_username: "fedora",
+    ssh_opts_append: "-o Compression=yes -o CompressionLevel=5",
+    sshfs_opts_append: "-o auto_cache -o cache_timeout=115200",
+    disabled: false, type: "sshfs"
+....
+
+[[options-specific-to-reverse-mounting-guest-host-mount]]
+=== Options Specific to Reverse Mounting (Guest->Host Mount)
+
+If your host has the `sshfs` software installed then the following
+options enable mounting a folder from a Vagrant Guest into the Vagrant
+Host:
+
+* `reverse`
+** This can be set to 'true' to enable reverse mounting a guest folder
+into the Vagrant host.
+
+An example snippet from a `Vagrantfile` where we want to mount `/data`
+on the guest into `/guest/data` on the host:
+
+....
+config.vm.synced_folder "/guest/data", "/data", type: 'sshfs', reverse: true
+....
+
+[[faq]]
+== FAQ
+
+Here are some answers to some frequently asked questions:
+
+[[why-do-new-files-take-time-to-appear-inside-the-guest]]
+=== Why do new files take time to appear inside the guest?
+
+Sometimes it can take time for files to appear on the other end of the
+sshfs mount. An example would be I create a file on my host system and
+then it doesn't show up inside the guest mount for 10 to 20 seconds.
+This is because of caching that SSHFS does to improve performance.
+Performance vs accuracy is always going to be a trade-off. If you'd like
+to disable caching completely you can disable caching completely by
+appending the `cache=no` SSHFS option to the synced folder definition in
+the Vagrantfile like so:
+
+....
+config.vm.synced_folder "/path/on/host", "/path/on/guest",
+    type: "sshfs", sshfs_opts_append: "-o cache=no"
+....
+
+All caching options that are available to sshfs can be added/modified in
+this same manner.
+
+[[appendix-a-using-keys-and-forwarding-ssh-agent]]
+== Appendix A: Using Keys and Forwarding SSH Agent
+
+When
+link:#sharing-arbitrary-host-directory-to-vagrant-guest---1-of-users[sharing
+an arbitrary host directory] you may want a completely non-interactive
+experience. You can either hard code your password in the Vagrantfile or
+you can use SSH keys. A few guides for setting up ssh keys and key
+forwarding are on Github: -
+https://help.github.com/articles/generating-ssh-keys[Key Generation] -
+https://developer.github.com/guides/using-ssh-agent-forwarding/[Key
+Forwarding]
+
+The idea is that if `key1` is a key that is authorized to log in to the
+Vagrant host ,meaning there is an entry for `key1` in the
+`~/.ssh/authorized_keys` file, then you should be able to do the
+following to have a non-interactive experience with SSH keys and agent
+forwarding:
+
+Modify the Vagrantfile to forward your SSH agent:
+
+....
+config.ssh.forward_agent = 'true'
+....
+
+Now set up your agent and add your key to the agent:
+
+....
+# eval $(ssh-agent)
+# ssh-add /path/to/key1
+....
+
+And finally bring up your Vagrant guest:
+
+....
+# vagrant up
+....
+
+[[appendix-b-development]]
+== Appendix B: Development
+
+For local development of this plugin here is an example of how to build,
+test and install this plugin on your local machine:
+
+....
+# Install development dependencies
+$ gem install bundler && bundle install
+
+# List available Rake tasks
+$ bundle exec rake -T
+
+# Run Cucumber tests
+$ bundle exec rake featuretests
+
+# Build the gem (gets generated in the 'pkg' directory
+$ bundle exec rake build
+
+# Run Vagrant in the context of the plugin
+$ bundle exec vagrant <command>
+
+# Install built gem into global Vagrant installation (run outside of git checkout!)
+$ vagrant plugin install <path to gem in pkg directory>
+....