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authorMikhail Tsykalov <tsymsh@gmail.com>2020-11-06 12:47:38 +0300
committerLudovic Courtès <ludo@gnu.org>2020-11-26 00:05:39 +0100
commita9a2fdaabcc78e7a54d9a6bcfa4ee3de308e9a90 (patch)
tree1852c17d33cc33ce572810f8042fe5c24a7ef235
parent788df2ecd62d5c2fc0d94928f45c947e6393e20b (diff)
mapped-devices: Add 'lvm-device-mapping'.
* gnu/system/mapped-devices.scm (lvm-device-mapping, open-lvm-device, close-lvm-device): New variables. * gnu/tests/install.scm (%lvm-separate-home-os, %lvm-separate-home-os-source, %lvm-separate-home-installation-script, %test-lvm-separate-home-os): New variables. * gnu/system/linux-initrd.scm (raw-initrd): Add (srfi srfi-1) to initrd expression. Signed-off-by: Ludovic Courtès <ludo@gnu.org>
-rw-r--r--doc/guix.texi25
-rw-r--r--gnu/system/linux-initrd.scm1
-rw-r--r--gnu/system/mapped-devices.scm25
-rw-r--r--gnu/tests/install.scm87
4 files changed, 134 insertions, 4 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 13fb4b1531..22102972a3 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -13758,7 +13758,6 @@ Guix extends this notion by considering any device or set of devices that
are @dfn{transformed} in some way to create a new device; for instance,
RAID devices are obtained by @dfn{assembling} several other devices, such
as hard disks or partitions, into a new one that behaves as one partition.
-Other examples, not yet implemented, are LVM logical volumes.
Mapped devices are declared using the @code{mapped-device} form,
defined as follows; for examples, see below.
@@ -13771,7 +13770,8 @@ the system boots up.
@item source
This is either a string specifying the name of the block device to be mapped,
such as @code{"/dev/sda3"}, or a list of such strings when several devices
-need to be assembled for creating a new one.
+need to be assembled for creating a new one. In case of LVM this is a
+string specifying name of the volume group to be mapped.
@item target
This string specifies the name of the resulting mapped device. For
@@ -13780,6 +13780,9 @@ specifying @code{"my-partition"} leads to the creation of
the @code{"/dev/mapper/my-partition"} device.
For RAID devices of type @code{raid-device-mapping}, the full device name
such as @code{"/dev/md0"} needs to be given.
+LVM logical volumes of type @code{lvm-device-mapping} need to
+be specified as @code{"VGNAME-LVNAME"}.
+
@item targets
This list of strings specifies names of the resulting mapped devices in case
there are several. The format is identical to @var{target}.
@@ -13803,6 +13806,11 @@ module for the appropriate RAID level to be loaded, such as @code{raid456}
for RAID-4, RAID-5 or RAID-6, or @code{raid10} for RAID-10.
@end defvr
+@defvr {Scheme Variable} lvm-device-mapping
+This defines LVM logical volume(s). Volume group is activated by
+@command{vgchange} command from the package @code{lvm2}.
+@end defvr
+
@cindex disk encryption
@cindex LUKS
The following example specifies a mapping from @file{/dev/sda3} to
@@ -13860,6 +13868,19 @@ Note that the RAID level need not be given; it is chosen during the
initial creation and formatting of the RAID device and is determined
automatically later.
+LVM logical volumes ``alpha'' and ``beta'' from volume group ``vg0'' can
+be declared as follows:
+
+@lisp
+(mapped-device
+ (source "vg0")
+ (target (list "vg0-alpha" "vg0-beta"))
+ (type lvm-device-mapping))
+@end lisp
+
+Devices @file{/dev/mapper/vg0-alpha} and @file{/dev/mapper/vg0-beta} can
+then be used as the @code{device} of a @code{file-system} declaration
+(@pxref{File Systems}).
@node User Accounts
@section User Accounts
diff --git a/gnu/system/linux-initrd.scm b/gnu/system/linux-initrd.scm
index 3e2f1282cc..85e493fecb 100644
--- a/gnu/system/linux-initrd.scm
+++ b/gnu/system/linux-initrd.scm
@@ -217,6 +217,7 @@ upon error."
(gnu system file-systems)
((guix build utils) #:hide (delete))
(guix build bournish) ;add the 'bournish' meta-command
+ (srfi srfi-1) ;for lvm-device-mapping
(srfi srfi-26)
;; FIXME: The following modules are for
diff --git a/gnu/system/mapped-devices.scm b/gnu/system/mapped-devices.scm
index 8b5aec983d..559c27bb28 100644
--- a/gnu/system/mapped-devices.scm
+++ b/gnu/system/mapped-devices.scm
@@ -36,7 +36,7 @@
#:autoload (gnu build linux-modules)
(missing-modules)
#:autoload (gnu packages cryptsetup) (cryptsetup-static)
- #:autoload (gnu packages linux) (mdadm-static)
+ #:autoload (gnu packages linux) (mdadm-static lvm2-static)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
@@ -64,7 +64,8 @@
check-device-initrd-modules ;XXX: needs a better place
luks-device-mapping
- raid-device-mapping))
+ raid-device-mapping
+ lvm-device-mapping))
;;; Commentary:
;;;
@@ -304,4 +305,24 @@ TARGET (e.g., \"/dev/md0\"), using 'mdadm'."
(open open-raid-device)
(close close-raid-device)))
+(define (open-lvm-device source targets)
+ #~(and
+ (zero? (system* #$(file-append lvm2-static "/sbin/lvm")
+ "vgchange" "--activate" "ay" #$source))
+ ; /dev/mapper nodes are usually created by udev, but udev may be unavailable at the time we run this. So we create them here.
+ (zero? (system* #$(file-append lvm2-static "/sbin/lvm")
+ "vgscan" "--mknodes"))
+ (every file-exists? (map (lambda (file) (string-append "/dev/mapper/" file))
+ '#$targets))))
+
+
+(define (close-lvm-device source targets)
+ #~(zero? (system* #$(file-append lvm2-static "/sbin/lvm")
+ "vgchange" "--activate" "n" #$source)))
+
+(define lvm-device-mapping
+ (mapped-device-kind
+ (open open-lvm-device)
+ (close close-lvm-device)))
+
;;; mapped-devices.scm ends here
diff --git a/gnu/tests/install.scm b/gnu/tests/install.scm
index 2d62a873ca..71caa3a493 100644
--- a/gnu/tests/install.scm
+++ b/gnu/tests/install.scm
@@ -67,6 +67,7 @@
%test-btrfs-root-on-subvolume-os
%test-jfs-root-os
%test-f2fs-root-os
+ %test-lvm-separate-home-os
%test-gui-installed-os
%test-gui-installed-os-encrypted
@@ -798,6 +799,92 @@ build (current-guix) and then store a couple of full system images.")
;;;
+;;; Separate /home on LVM
+;;;
+
+;; Since LVM support in guix currently doesn't allow root-on-LVM we use /home on LVM
+(define-os-with-source (%lvm-separate-home-os %lvm-separate-home-os-source)
+ (use-modules (gnu) (gnu tests))
+
+ (operating-system
+ (host-name "separate-home-on-lvm")
+ (timezone "Europe/Paris")
+ (locale "en_US.utf8")
+
+ (bootloader (bootloader-configuration
+ (bootloader grub-bootloader)
+ (target "/dev/vdb")))
+ (kernel-arguments '("console=ttyS0"))
+
+ (mapped-devices (list (mapped-device
+ (source "vg0")
+ (target "vg0-home")
+ (type lvm-device-mapping))))
+ (file-systems (cons* (file-system
+ (device (file-system-label "root-fs"))
+ (mount-point "/")
+ (type "ext4"))
+ (file-system
+ (device "/dev/mapper/vg0-home")
+ (mount-point "/home")
+ (type "ext4")
+ (dependencies mapped-devices))
+ %base-file-systems))
+ (users %base-user-accounts)
+ (services (cons (service marionette-service-type
+ (marionette-configuration
+ (imported-modules '((gnu services herd)
+ (guix combinators)))))
+ %base-services))))
+
+(define %lvm-separate-home-installation-script
+ "\
+. /etc/profile
+set -e -x
+guix --version
+
+export GUIX_BUILD_OPTIONS=--no-grafts
+parted --script /dev/vdb mklabel gpt \\
+ mkpart primary ext2 1M 3M \\
+ mkpart primary ext2 3M 1.6G \\
+ mkpart primary 1.6G 3.2G \\
+ set 1 boot on \\
+ set 1 bios_grub on
+pvcreate /dev/vdb3
+vgcreate vg0 /dev/vdb3
+lvcreate -L 1.6G -n home vg0
+vgchange -ay
+mkfs.ext4 -L root-fs /dev/vdb2
+mkfs.ext4 /dev/mapper/vg0-home
+mount /dev/vdb2 /mnt
+mkdir /mnt/home
+mount /dev/mapper/vg0-home /mnt/home
+df -h /mnt /mnt/home
+herd start cow-store /mnt
+mkdir /mnt/etc
+cp /etc/target-config.scm /mnt/etc/config.scm
+guix system init /mnt/etc/config.scm /mnt --no-substitutes
+sync
+reboot\n")
+
+(define %test-lvm-separate-home-os
+ (system-test
+ (name "lvm-separate-home-os")
+ (description
+ "Test functionality of an OS installed with a LVM /home partition")
+ (value
+ (mlet* %store-monad ((image (run-install %lvm-separate-home-os
+ %lvm-separate-home-os-source
+ #:script
+ %lvm-separate-home-installation-script
+ #:packages (list lvm2-static)
+ #:target-size (* 3200 MiB)))
+ (command (qemu-command/writable-image image)))
+ (run-basic-test %lvm-separate-home-os
+ `(,@command) "lvm-separate-home-os")))))
+
+
+;;;
;;; Btrfs root file system.
;;;