From 81c3dd9cad29f2b0999aa1f22b3a7d4c04f1a842 Mon Sep 17 00:00:00 2001 From: Ludovic Courtès Date: Fri, 23 Oct 2020 11:46:21 +0200 Subject: services: swap: Allow for UUIDs and file system labels. * gnu/services/base.scm (swap-service-type)[device-lookup, device-name]: New variables. Add 'modules' field to 'shepherd-service'. In 'start' and 'stop', use 'device-lookup' to resolve UUIDs and labels. * doc/guix.texi (operating-system Reference): Adjust accordingly. --- doc/guix.texi | 34 +++++++++++++++++++++++++++++----- 1 file changed, 29 insertions(+), 5 deletions(-) (limited to 'doc') diff --git a/doc/guix.texi b/doc/guix.texi index eddf77c7ab..2319bba2ba 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -13075,14 +13075,38 @@ A list of mapped devices. @xref{Mapped Devices}. @item @code{file-systems} A list of file systems. @xref{File Systems}. -@item @code{swap-devices} (default: @code{'()}) @cindex swap devices -A list of strings identifying devices or files to be used for ``swap +@cindex swap space +@item @code{swap-devices} (default: @code{'()}) +A list of UUIDs, file system labels, or strings identifying devices or +files to be used for ``swap space'' (@pxref{Memory Concepts,,, libc, The GNU C Library Reference -Manual}). For example, @code{'("/dev/sda3")} or @code{'("/swapfile")}. +Manual}). Here are some examples: + +@table @code +@item (list (uuid "4dab5feb-d176-45de-b287-9b0a6e4c01cb")) +Use the swap partition with the given UUID. You can learn the UUID of a +Linux swap partition by running @command{swaplabel @var{device}}, where +@var{device} is the @file{/dev} file name of that partition. + +@item (list (file-system-label "swap")) +Use the partition with label @code{swap}. Again, the +@command{swaplabel} command allows you to view and change the label of a +Linux swap partition. + +@item (list "/swapfile") +Use the file @file{/swapfile} as swap space. + +@item (list "/dev/sda3" "/dev/sdb2") +Use the @file{/dev/sda3} and @file{/dev/sdb2} partitions as swap space. +We recommend referring to swap devices by UUIDs or labels as shown above +instead. +@end table + It is possible to specify a swap file in a file system on a mapped -device, provided that the necessary device mapping and file system are -also specified. @xref{Mapped Devices} and @ref{File Systems}. +device (under @file{/dev/mapper}), provided that the necessary device +mapping and file system are also specified. @xref{Mapped Devices} and +@ref{File Systems}. @item @code{users} (default: @code{%base-user-accounts}) @itemx @code{groups} (default: @code{%base-groups}) -- cgit 1.4.1