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authorMatthew Brooks <matthewfbrooks@mailbox.org>2020-04-22 15:43:07 -0400
committerLeo Famulari <leo@famulari.name>2020-04-22 15:49:53 -0400
commit60651dd9624e4ca648ef0f0d426628377533a637 (patch)
treed585abefc61677ad02caa3ff94a139f7bdecee91 /doc
parent9475c631a70b82614a8f3d6db2840d00955e2e1c (diff)
downloadguix-60651dd9624e4ca648ef0f0d426628377533a637.tar
guix-60651dd9624e4ca648ef0f0d426628377533a637.tar.gz
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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-rw-r--r--doc/guix-cookbook.texi51
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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