Subject: [bug#41143] [PATCH v2 2/2] mapped-devices: Add 'lvm-device-mapping'.

From: Mikhail Tsykalov <[email-masked]>
Date: Fri, 2 Oct 2020 01:49:00 +0300

* 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.
---
 gnu/system/linux-initrd.scm   |  1 +
 gnu/system/mapped-devices.scm | 25 +++++++++-
 gnu/tests/install.scm         | 87 +++++++++++++++++++++++++++++++++++
 3 files changed, 111 insertions(+), 2 deletions(-)

diff --git a/gnu/system/linux-initrd.scm b/gnu/system/linux-initrd.scm
index db02059a26..41cbe28c3c 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)
                       (srfi srfi-26)
 
                       ;; FIXME: The following modules are for
diff --git a/gnu/system/mapped-devices.scm b/gnu/system/mapped-devices.scm
index 8622418fcf..8088bd99a3 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:
 ;;;
@@ -296,4 +297,24 @@ 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 dee2b870e8..84fe8bda78 100644
--- a/gnu/tests/install.scm
+++ b/gnu/tests/install.scm
@@ -65,6 +65,7 @@
             %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
@@ -794,6 +795,92 @@ build (current-guix) and then store a couple of full system images.")
       (run-basic-test %encrypted-root-os command "encrypted-root-os"
                       #:initialization enter-luks-passphrase)))))
 
+
+;;;
+;;; 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.
-- 
2.28.0