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Andrew David Wong 2016-09-15 13:14:38 -07:00
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customization/bind-dirs.md
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@ -6,20 +6,22 @@ redirect_from:
- /en/doc/bind-dirs/
---
# What is bind-dirs.sh? #
# How to make any file in a TemplateBasedVM persistent using bind-dirs #
## What is bind-dirs.sh? ##
With [bind-dirs.sh](https://github.com/QubesOS/qubes-core-agent-linux/blob/master/vm-systemd/bind-dirs.sh)
you can make arbitrary files or folders persistent in TemplateBasedVMs.
# What is it useful for? #
## What is it useful for? ##
For example, it is useful for Whonix, sys-whonix, where [Tor's data dir /var/lib/tor has been made persistent in the TemplateBased ProxyVM sys-whonix](https://github.com/Whonix/qubes-whonix/blob/8438d13d75822e9ea800b9eb6024063f476636ff/usr/lib/qubes-bind-dirs.d/40_qubes-whonix.conf#L5). So sys-whonix does not require to be a StandaloneVM. And therefore can benefit from the Tor anonymity feature 'persistent Tor entry guards' without the overhead of a StandaloneVM.
# Minimum Qubes Version #
## Minimum Qubes Version ##
bind-dirs.sh works with Qubes R3.2 and above.
# How to use bind-dirs.sh? #
## How to use bind-dirs.sh? ##
1) Create a file `/rw/config/qubes-bind-dirs.d/50_user.conf` with root rights inside a VM.
@ -35,20 +37,20 @@ binds+=( '/var/lib/tor' )
5) Done.
# Other Configuration Folders #
## Other Configuration Folders ##
* `/usr/lib/qubes-bind-dirs.d` (lowest priority, for packages)
* `/etc/qubes-bind-dirs.d` (intermediate priority, for template wide configuration)
* `/rw/config/qubes-bind-dirs.d` (highest priority, for per VM configuration)
# Limitations #
## Limitations ##
* Files that exist in the TempalteVM root image cannot be made deleted in the TemlateBasedVMs root image using bind-dirs.sh.
* Does not work if the file / folder in question does not already exist in the root image. I.e. a file that does not exist in the root image cannot be bind mounted in the TemplateBasedVM.
* Re-running `sudo /usr/lib/qubes/bind-dirs.sh` without previous `sudo /usr/lib/qubes/bind-dirs.sh umount` does not work.
* Running 'sudo /usr/lib/qubes/bind-dirs.sh umount' after boot (before shutdown) is probably not sane and nothing can be done about that.
# How to remove binds from bind-dirs.sh? #
## How to remove binds from bind-dirs.sh? ##
`binds` is actually just a bash variable (an array) and the bind-dirs.sh configuration folders are `source`d as bash snippets in lexical order. Therefore if you wanted to remove an existing entry from the `binds` array, you could do that by using a lexically higher configuration file. For example, if you wanted to make `/var/lib/tor` non-persistant in `sys-whonix` without manually editing [`/usr/lib/qubes-bind-dirs.d/40_qubes-whonix.conf`](https://github.com/Whonix/qubes-whonix/blob/master/usr/lib/qubes-bind-dirs.d/40_qubes-whonix.conf), you could use the following.
@ -60,7 +62,7 @@ binds=( "${binds[@]/'/var/lib/tor'}" )
(Editing `/usr/lib/qubes-bind-dirs.d/40_qubes-whonix.conf` directly is recommended against, since such changes get lost when that file is changed in the package on upgrades.)
# Discussion #
## Discussion ##
[TemplateBasedVMs: make selected files and folders located in the root image persistent- review bind-dirs.sh](https://groups.google.com/forum/#!searchin/qubes-devel/bind-dirs|sort:relevance/qubes-devel/tcYQ4eV-XX4/J89DRLzOBQAJ)