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user/advanced-configuration/bind-dirs.md
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@ -19,12 +19,12 @@ In a TemplateBasedVM all of the file system comes from the template except `/hom
This means that changes in the rest of the filesystem are lost when the TemplateBasedVM is shutdown.
bind-dirs provides a mechanism whereby files usually taken from the template can be persisted across reboots.
For example, in Whonix, [Tor's data dir /var/lib/tor has been made persistent in the TemplateBased ProxyVM sys-whonix][whonix]
For example, in Whonix, [Tor's data dir `/var/lib/tor` has been made persistent in the TemplateBased ProxyVM sys-whonix][whonix]
In this way sys-whonix can benefit from the Tor anonymity feature 'persistent Tor entry guards' but does not have to be a StandaloneVM.
## How to use bind-dirs.sh? ##
In this example, we want to make /var/lib/tor persistent.
In this example, we want to make `/var/lib/tor` persistent.
Inside the TemplateBasedVM.
@ -44,9 +44,9 @@ Inside the TemplateBasedVM.
6. Done.
From now on any files within the/var/lib/tor folder will persist across reboots.
From now on any files within the `/var/lib/tor` folder will persist across reboots.
You can make make many files or folders persist, simply by making multiple entries in the `50_user.conf` file, each on a separate line.
You can make make many files or folders persist, simply by making multiple entries in the `50_user.conf` file, each on a separate line.
For example, if you added the file `/etc/tor/torrc` to the `binds` variable, any modifications to *that* file will persist across reboots.
binds+=( '/var/lib/tor' )
@ -61,12 +61,12 @@ For example, if you added the file `/etc/tor/torrc` to the `binds` variable, any
## How does it work? ##
bind-dirs.sh is called at startup of a TemplateBasedVM, and configuration files in the above configuration folders are parsed to build a bash array.
Files or folders identified in the array are copied to /rw/bind-dirs if they do not already exist there, and are then bind mounted over the original files/folders.
Files or folders identified in the array are copied to `/rw/bind-dirs` if they do not already exist there, and are then bind mounted over the original files/folders.
Creation of the files and folders in /rw/bind-dirs should be automatic the first time the TemplateBasedVM is restarted after configuration.
Creation of the files and folders in `/rw/bind-dirs` should be automatic the first time the TemplateBasedVM is restarted after configuration.
If you want to circumvent this process, you can create the relevant file structure under /rw/bind-dirs and make any changes at the same time that you perform the configuration, before reboot.
Note that you must create the full folder structure under /rw/bind-dirs - e.g you would have to create /rw/bind-dirs/var/lib/tor
If you want to circumvent this process, you can create the relevant file structure under `/rw/bind-dirs` and make any changes at the same time that you perform the configuration, before reboot.
Note that you must create the full folder structure under `/rw/bind-dirs` - e.g you would have to create `/rw/bind-dirs/var/lib/tor`
## Limitations ##
@ -75,16 +75,16 @@ Note that you must create the full folder structure under /rw/bind-dirs - e.g yo
* Re-running `sudo /usr/lib/qubes/init/bind-dirs.sh` without a previous `sudo /usr/lib/qubes/init/bind-dirs.sh umount` does not work.
* Running `sudo /usr/lib/qubes/init/bind-dirs.sh umount` after boot (before shutdown) is probably not sane and nothing can be done about that.
* Many editors create a temporary file and copy it over the original file. If you have bind mounted an individual file this will break the mount.
Any changes you make will not survive a reboot. If you think it likely you will want to edit a file, then either include the parent directory in bind-dirs rather than the file, or perform the file operation on the file in /rw/bind-dirs.
* Some files are altered when a qube boots - e.g. `/etc/hosts`.
If you try to use bind-dirs on such files you may break your qube in unpredictable ways.
You can add persistent rules to /etc/hosts using [/rw/config/rc.local][config-file]
Any changes you make will not survive a reboot. If you think it likely you will want to edit a file, then either include the parent directory in bind-dirs rather than the file, or perform the file operation on the file in `/rw/bind-dirs`.
* Some files are altered when a qube boots - e.g. `/etc/hosts`.
If you try to use bind-dirs on such files you may break your qube in unpredictable ways.
You can add persistent rules to `/etc/hosts` using [`/rw/config/rc.local`][config-file]
## 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 sourced 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-persistent in `sys-whonix` without manually editing /usr/lib/qubes-bind-dirs.d/40_qubes-whonix.conf, you could use the following in:
`binds` is actually just a bash variable (an array) and the bind-dirs.sh configuration folders are sourced 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-persistent in `sys-whonix` without manually editing `/usr/lib/qubes-bind-dirs.d/40_qubes-whonix.conf`, you could use the following in:
`/rw/config/qubes-bind-dirs.d/50_user.conf`