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[bug#45692] [PATCH 4/4] gnu: Add ZFS service.
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From: |
raid5atemyhomework |
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Subject: |
[bug#45692] [PATCH 4/4] gnu: Add ZFS service. |
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Date: |
Wed, 06 Jan 2021 15:57:19 +0000 |
>From deded39fe88c44a18b0b66bab8c4300aca4c387e Mon Sep 17 00:00:00 2001
From: raid5atemyhomework <raid5atemyhomework@protonmail.com>
Date: Wed, 6 Jan 2021 09:24:20 +0800
Subject: [PATCH 4/4] gnu: Add ZFS service.
* gnu/services/file-systems.scm: New file.
(zfs-service-type): New variable.
(zfs-configuration): New variable.
(zfs-configuration?): New procedure.
* gnu/local.mk: Add gnu/services/file-systems.scm.
* doc/guix.texi (ZFS file system): New subsection.
---
doc/guix.texi | 107 ++++++++++++++++++++++++++
gnu/local.mk | 2 +
gnu/services/file-systems.scm | 136 ++++++++++++++++++++++++++++++++++
3 files changed, 245 insertions(+)
create mode 100644 gnu/services/file-systems.scm
diff --git a/doc/guix.texi b/doc/guix.texi
index 78770151e3..62437083cb 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -13885,6 +13885,113 @@ a file system declaration such as:
compress-force=zstd,space_cache=v2"))
@end lisp
+@node ZFS file system
+@subsection ZFS file system
+
+The ZFS file system has a license incompatible with the Linux kernel,
+and thus cannot be distributed with the kernel. However, as a user
+you have the right to do whatever you want on your own hardware,
+including download the ZFS source code, compile it, link it to your
+own private copy of Linux, and run it. You can even use the Guix build
+system to automate this.
+
+As a large and complex kernel module, ZFS on Linux has to be compiled
+with a specific version of the kernel. Often even the latest ZFS
+package available cannot be compiled with the latest Linux kernel
+package provided by Guix System. Thus, installing the @code{zfs}
+package is likely to fail.
+
+Instead, you have to use an older long-term-support Linux kernel.
+Do not use @code{linux-libre-lts} as the latest long-term-support
+kernel might be too new for the ZFS package; instead, explicitly
+select the version number, like @code{linux-libre-5.4}.
+
+Then, you have to modify your system configuration file and use the
+selected older kernel, and add the @code{zfs-service-type} service.
+
+@lisp
+(use-modules (gnu))
+(use-package-modules
+ ; @dots{}
+ linux)
+(use-service-modules
+ ; @dots{}
+ file-systems)
+
+(define my-kernel linux-libre-5.4)
+
+(operating-system
+ (kernel my-kernel)
+ ;; @dots{}
+ (services
+ (cons* (service zfs-service-type
+ (zfs-configuration
+ (kernel my-kernel)))
+ ; @dots{}
+ %desktop-services))
+ ;; @dots{}
+ )
+@end lisp
+
+@defvr {Scheme Variable} zfs-service-type
+This is the type of the service to compile and install OpenZFS to
+your operating system. It loads the ZFS module at startup, imports
+pools, mounts automounted ZFS datasets, installs the ZFS command
+line tools, and can provide module options for the ZFS module. Its
+value must be a @code{zfs-configuration} record (see below).
+
+Here is an example use:
+
+@lisp
+(service zfs-service-type
+ (zfs-configuration
+ (kernel linux-libre-5.4)
+ (options '("zfs_arc_max=5000000000"))))
+@end lisp
+@end defvr
+
+@deftp {Data Type} zfs-configuration
+This data type represents the configuration of the ZFS service.
+The available fields are:
+
+@table @asis
+@item @code{kernel}
+The package of the Linux kernel to compile ZFS for. Required.
+
+@item @code{base-zfs} (default: @code{zfs})
+The ZFS package to use. It will be modified to use the indicated
+kernel.
+
+@item @code{options} (default: @code{'()})
+A list of string options to pass as options to the ZFS module.
+These will be put in a @file{/etc/modprobe.d/zfs.conf} file,
+for example setting this to @code{'("zfs_admin_snapshot=1"
+"zfs_trim_extent_bytes_min=0")} will create the following file:
+
+@example
+options zfs zfs_admin_snapshot=1 zfs_trim_extent_bytes_min=0
+@end example
+@end table
+@end deftp
+
+Once your system has been configured to include the ZFS service
+and you have restarted the system, you can manage ZFS pools and
+datasets with @code{zpool} and @code{zfs} commands.
+
+ZFS datasets with an appropriate @code{mountpoint} property will
+be automounted at startup after the root file system is started.
+Encrypted datasets that are automounted will cause boot to pause
+and prompt for the password to be provided on the console.
+
+It's possible to have a ZFS dataset as your @code{/home} by simply
+setting the @code{mountpoint} property. However, note that ZFS will
+refuse to mount over a non-empty directory, so if your root
+filesystem already has a non-empty @code{/home}, you should remove
+it and its contents, then restart the system.
+
+Having ZFS as a root filesystem or as @code{/boot} is not supported
+yet.
+
@node Mapped Devices
@section Mapped Devices
diff --git a/gnu/local.mk b/gnu/local.mk
index 53a67e6ffe..49073ac2ac 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -39,6 +39,7 @@
# Copyright © 2020 Martin Becze <mjbecze@riseup.net>
# Copyright © 2020 Malte Frank Gerdes <mate.f.gerdes@gmail.com>
# Copyright © 2020 Vinicius Monego <monego@posteo.net>
+# Copyright © 2021 raid5atemyhomework <raid5atemyhomework@protonmail.com>
#
# This file is part of GNU Guix.
#
@@ -601,6 +602,7 @@ GNU_SYSTEM_MODULES = \
%D%/services/dict.scm \
%D%/services/dns.scm \
%D%/services/docker.scm \
+ %D%/services/file-systems.scm \
%D%/services/authentication.scm \
%D%/services/games.scm \
%D%/services/ganeti.scm \
diff --git a/gnu/services/file-systems.scm b/gnu/services/file-systems.scm
new file mode 100644
index 0000000000..7a92a2b9d5
--- /dev/null
+++ b/gnu/services/file-systems.scm
@@ -0,0 +1,136 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2021 raid5atemyhomework <raid5atemyhomework@protonmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu services file-systems)
+ #:use-module (gnu packages file-systems)
+ #:use-module (gnu services)
+ #:use-module (gnu services base)
+ #:use-module (gnu services shepherd)
+ #:use-module (guix gexp)
+ #:use-module (guix packages)
+ #:use-module (guix records)
+ #:export (zfs-service-type
+ zfs-configuration
+ zfs-configuration?))
+
+(define-record-type* <zfs-configuration>
+ zfs-configuration make-zfs-configuration zfs-configuration?
+ ; kernel you want to compile the base-zfs module for.
+ (kernel zfs-configuration-kernel)
+ ; base package that will be compiled for the kernel
+ (base-zfs zfs-configuration-base-zfs (default zfs))
+ ; list of string options.
+ (options zfs-configuration-options (default '())))
+
+(define (make-zfs-package conf)
+ (let ((base-zfs (zfs-configuration-base-zfs conf))
+ (kernel (zfs-configuration-kernel conf)))
+ (package
+ (inherit base-zfs)
+ (name (string-join (list (package-name base-zfs)
+ "for"
+ (package-name kernel)
+ (package-version kernel)
+ "version")
+ "-"))
+ (arguments (cons* #:linux kernel (package-arguments base-zfs))))))
+
+(define (zfs-loadable-module conf)
+ (list (list (make-zfs-package conf) "module")))
+
+(define (zfs-shepherd-services conf)
+ (let* ((zfs-package (make-zfs-package conf))
+ (zpool (file-append zfs-package "/sbin/zpool")))
+ (list
+ (shepherd-service
+ (documentation "Scans for ZFS pools and automounts filesystems.")
+ (provision '(zfs-scan-automount))
+ (requirement '(root-file-system))
+ (modules `((srfi srfi-1)
+ (srfi srfi-34)
+ (srfi srfi-35)
+ (rnrs io ports)
+ ,@%default-modules))
+ (start #~(lambda _
+ (and
+ ;; You'd think we could've used
kernel-module-loader-service-type,
+ ;; but the kernel-module-loader shepherd service is
dependent on
+ ;; file-systems, and file-systems is made dependent on
this
+ ;; service. And we need the kernel module to be loaded
before we
+ ;; scan for ZFS pools. So break the dependency loop by
just
+ ;; loading ZFS module here by ourselves.
+ (or (file-exists? "/proc/sys/kernel/modprobe")
+ (begin
+ (format (current-error-port) "error loading 'zfs'
module: ~a~%"
+ "Kernel is missing loadable module
support.")
+ #f))
+ (guard (c ((message-condition? c)
+ (format (current-error-port)
+ "error loading 'zfs' module: ~a~%"
+ (condition-message c))
+ #f))
+ (let ((modprobe (call-with-input-file
"/proc/sys/kernel/modprobe"
+ get-line)))
+ (invoke/quiet modprobe "--" "zfs")))
+
+ ; scan for pools and automount contained datasets.
+ (guard (c ((message-condition? c)
+ (format (current-error-port)
+ "error importing zpools: ~a~%"
+ (condition-message?))
+ #f))
+ ;; (current-output-port) is typically connected to
/dev/klog,
+ ;; so redirect it to (current-error-port) so that user
can see
+ ;; prompts for passphrases on console
+ (with-output-to-port (current-error-port)
+ (lambda ()
+ (invoke #$zpool "import" "-a" "-l")))))))
+ (stop #~(const #t))))))
+
+(define (zfs-profile-service conf)
+ (list (make-zfs-package conf)))
+
+(define (zfs-etc-service conf)
+ (let ((options (zfs-configuration-options conf)))
+ (if (null? options)
+ '()
+ `(("modprobe.d/zfs.conf"
+ ,(plain-file "zfs.conf"
+ (string-join (cons "options zfs" options) " ")))))))
+
+(define zfs-service-type
+ (service-type (name 'zfs)
+ (extensions
+ (list
+ ; install the kernel module
+ (service-extension kernel-loadable-module-service-type
+ zfs-loadable-module)
+ ; load ZFS module, scan ZFS pools, and automount
filesystems
+ (service-extension shepherd-root-service-type
+ zfs-shepherd-services)
+ ; make sure automount occurs before file-systems target is
reached
+ (service-extension file-systems-target-service-type
+ (const '(zfs-scan-automount)))
+ ; install ZFS management tools
+ (service-extension profile-service-type
+ zfs-profile-service)
+ ; install ZFS module options
+ (service-extension etc-service-type
+ zfs-etc-service)))
+ (description
+ "Install ZFS, an advanced filesystem and volume manager.")))
--
2.29.2