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-rw-r--r--doc/guix.texi6
-rw-r--r--gnu/build/file-systems.scm46
-rw-r--r--gnu/system/linux-initrd.scm6
-rw-r--r--gnu/tests/install.scm77
4 files changed, 129 insertions, 6 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index d46a7743d0..086895996f 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6919,9 +6919,9 @@ cfdisk
Once you are done partitioning the target hard disk drive, you have to
create a file system on the relevant partition(s)@footnote{Currently
-GuixSD pretty much assumes an ext4 file system. In particular, code
-that reads partition UUIDs and labels only works with ext4. This will
-be fixed in the future.}.
+GuixSD only supports ext4 and btrfs file systems. In particular, code
+that reads partition UUIDs and labels only works for these file system
+types.}.
Preferably, assign partitions a label so that you can easily and
reliably refer to them in @code{file-system} declarations (@pxref{File
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index e76854490c..6e5c6aaf15 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -146,6 +146,43 @@ if DEVICE does not contain an ext2 file system."
;;;
+;;; Btrfs file systems.
+;;;
+
+;; <https://btrfs.wiki.kernel.org/index.php/On-disk_Format#Superblock>.
+
+(define-syntax %btrfs-endianness
+ ;; Endianness of btrfs file systems.
+ (identifier-syntax (endianness little)))
+
+(define (btrfs-superblock? sblock)
+ "Return #t when SBLOCK is a btrfs superblock."
+ (bytevector=? (sub-bytevector sblock 64 8)
+ (string->utf8 "_BHRfS_M")))
+
+(define (read-btrfs-superblock device)
+ "Return the raw contents of DEVICE's btrfs superblock as a bytevector, or #f
+if DEVICE does not contain a btrfs file system."
+ (read-superblock device 65536 4096 btrfs-superblock?))
+
+(define (btrfs-superblock-uuid sblock)
+ "Return the UUID of a btrfs superblock SBLOCK as a 16-byte bytevector."
+ (sub-bytevector sblock 32 16))
+
+(define (btrfs-superblock-volume-name sblock)
+ "Return the volume name of SBLOCK as a string of at most 256 characters, or
+#f if SBLOCK has no volume name."
+ (null-terminated-latin1->string (sub-bytevector sblock 299 256)))
+
+(define (check-btrfs-file-system device)
+ "Return the health of a btrfs file system on DEVICE."
+ (match (status:exit-val
+ (system* "btrfs" "device" "scan"))
+ (0 'pass)
+ (_ 'fatal-error)))
+
+
+;;;
;;; LUKS encrypted devices.
;;;
@@ -257,11 +294,15 @@ partition field reader that returned a value."
(define %partition-label-readers
(list (partition-field-reader read-ext2-superblock
- ext2-superblock-volume-name)))
+ ext2-superblock-volume-name)
+ (partition-field-reader read-btrfs-superblock
+ btrfs-superblock-volume-name)))
(define %partition-uuid-readers
(list (partition-field-reader read-ext2-superblock
- ext2-superblock-uuid)))
+ ext2-superblock-uuid)
+ (partition-field-reader read-btrfs-superblock
+ btrfs-superblock-uuid)))
(define read-partition-label
(cut read-partition-field <> %partition-label-readers))
@@ -428,6 +469,7 @@ the following:
(define check-procedure
(cond
((string-prefix? "ext" type) check-ext2-file-system)
+ ((string-prefix? "btrfs" type) check-btrfs-file-system)
(else #f)))
(if check-procedure
diff --git a/gnu/system/linux-initrd.scm b/gnu/system/linux-initrd.scm
index a787072ba7..4a753cdadb 100644
--- a/gnu/system/linux-initrd.scm
+++ b/gnu/system/linux-initrd.scm
@@ -197,6 +197,9 @@ loaded at boot time in the order in which they appear."
,@(if (find (file-system-type-predicate "vfat") file-systems)
'("nls_iso8859-1")
'())
+ ,@(if (find (file-system-type-predicate "btrfs") file-systems)
+ '("btrfs")
+ '())
,@(if volatile-root?
'("fuse")
'())
@@ -214,6 +217,9 @@ loaded at boot time in the order in which they appear."
file-systems)
(list fatfsck/static)
'())
+ ,@(if (find (file-system-type-predicate "btrfs") file-systems)
+ (list btrfs-progs/static)
+ '())
,@(if volatile-root?
(list unionfs-fuse/static)
'())))
diff --git a/gnu/tests/install.scm b/gnu/tests/install.scm
index 4779b80e94..ae54154c5c 100644
--- a/gnu/tests/install.scm
+++ b/gnu/tests/install.scm
@@ -36,7 +36,8 @@
#:export (%test-installed-os
%test-separate-store-os
%test-raid-root-os
- %test-encrypted-os))
+ %test-encrypted-os
+ %test-btrfs-root-os))
;;; Commentary:
;;;
@@ -518,4 +519,78 @@ 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)))))
+
+;;;
+;;; Btrfs root file system.
+;;;
+
+(define-os-with-source (%btrfs-root-os %btrfs-root-os-source)
+ ;; The OS we want to install.
+ (use-modules (gnu) (gnu tests) (srfi srfi-1))
+
+ (operating-system
+ (host-name "liberigilo")
+ (timezone "Europe/Paris")
+ (locale "en_US.UTF-8")
+
+ (bootloader (grub-configuration (device "/dev/vdb")))
+ (kernel-arguments '("console=ttyS0"))
+ (file-systems (cons (file-system
+ (device "my-root")
+ (title 'label)
+ (mount-point "/")
+ (type "btrfs"))
+ %base-file-systems))
+ (users (cons (user-account
+ (name "charlie")
+ (group "users")
+ (home-directory "/home/charlie")
+ (supplementary-groups '("wheel" "audio" "video")))
+ %base-user-accounts))
+ (services (cons (service marionette-service-type
+ (marionette-configuration
+ (imported-modules '((gnu services herd)
+ (guix combinators)))))
+ %base-services))))
+
+(define %btrfs-root-installation-script
+ ;; Shell script of a simple installation.
+ "\
+. /etc/profile
+set -e -x
+guix --version
+
+export GUIX_BUILD_OPTIONS=--no-grafts
+ls -l /run/current-system/gc-roots
+parted --script /dev/vdb mklabel gpt \\
+ mkpart primary ext2 1M 3M \\
+ mkpart primary ext2 3M 1G \\
+ set 1 boot on \\
+ set 1 bios_grub on
+mkfs.btrfs -L my-root /dev/vdb2
+mount /dev/vdb2 /mnt
+btrfs subvolume create /mnt/home
+herd start cow-store /mnt
+mkdir /mnt/etc
+cp /etc/target-config.scm /mnt/etc/config.scm
+guix system build /mnt/etc/config.scm
+guix system init /mnt/etc/config.scm /mnt --no-substitutes
+sync
+reboot\n")
+
+(define %test-btrfs-root-os
+ (system-test
+ (name "btrfs-root-os")
+ (description
+ "Test basic functionality of an OS installed like one would do by hand.
+This test is expensive in terms of CPU and storage usage since we need to
+build (current-guix) and then store a couple of full system images.")
+ (value
+ (mlet* %store-monad ((image (run-install %btrfs-root-os
+ %btrfs-root-os-source
+ #:script
+ %btrfs-root-installation-script))
+ (command (qemu-command/writable-image image)))
+ (run-basic-test %btrfs-root-os command "btrfs-root-os")))))
+
;;; install.scm ends here