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diff --git a/doc/guix-cookbook.texi b/doc/guix-cookbook.texi index 58a5ba1c80..5d126acd3d 100644 --- a/doc/guix-cookbook.texi +++ b/doc/guix-cookbook.texi @@ -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 |