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doc: cookbook: Explain how to use bind mounts. 

* doc/guix-cookbook.texi (Setting up a bind mount): Add example.

Signed-off-by: Leo Famulari <leo@famulari.name>
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Matthew Brooks 2020-04-22 15:43:07 -04:00 committed by Leo Famulari
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@ -12,6 +12,7 @@ Copyright @copyright{} 2019 Ricardo Wurmus@*
Copyright @copyright{} 2019 Efraim Flashner@*
Copyright @copyright{} 2019 Pierre Neidhardt@*
Copyright @copyright{} 2020 Oleg Pykhalov@*
Copyright @copyright{} 2020 Matthew Brooks@*
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
@ -1322,6 +1323,7 @@ reference.
@menu
* Customizing the Kernel:: Creating and using a custom Linux kernel on Guix System.
* Customizing a Window Manager:: Handle customization of a Window manager on Guix System.
* Setting up a bind mount:: Setting up a bind mount in the file-systems definition.
@end menu
@node Customizing the Kernel
@ -1614,6 +1616,55 @@ Then you need to add the following code to a StumpWM configuration file
(set-font (make-instance 'xft:font :family "DejaVu Sans Mono" :subfamily "Book" :size 11))
@end lisp
@node Setting up a bind mount
@section Setting up a bind mount
To bind mount a file system, one must first set up some definitions
before the @code{operating-system} section of the system definition. In
this example we will bind mount a folder from a spinning disk drive to
@code{/tmp}, to save wear and tear on the primary SSD, without
dedicating an entire partition to be mounted as @code{/tmp}.
First, the source drive that hosts the folder we wish to bind mount
should be defined, so that the bind mount can depend on it.
@lisp
(define source-drive ;; "source-drive" can be named anything you want.
(file-system
(device (uuid "UUID goes here"))
(mount-point "/path-to-spinning-disk-goes-here")
(type "ext4"))) ;; Make sure to set this to the appropriate type for your drive.
@end lisp
The source folder must also be defined, so that guix will know it's not
a regular block device, but a folder.
@lisp
(define (%source-directory) "/path-to-spinning-disk-goes-here/tmp") ;; "source-directory" can be named any valid variable name.
@end lisp
Finally, inside the @code{file-systems} definition, we must add the
mount itself.
@lisp
(file-systems (cons*
...<other drives omitted for clarity>...
source-drive ;; Must match the name you gave the source drive in the earlier definition.
(file-system
(device (%source-directory)) ;; Make sure "source-directory" matches your earlier definition.
(mount-point "/tmp")
(type "none") ;; We are mounting a folder, not a partition, so this type needs to be "none"
(flags '(bind-mount))
(dependencies (list source-drive)) ;; Ensure "source-drive" matches what you've named the variable for the drive.
)
...<other drives omitted for clarity>...
))
@end lisp
@c *********************************************************************
@node Advanced package management
@chapter Advanced package management