;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2020 Google LLC
+;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
+;;; Copyright © 2020 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-2)
#:use-module (srfi srfi-9)
+ #:use-module (srfi srfi-26)
+ #:use-module (srfi srfi-35)
#:use-module (srfi srfi-9 gnu)
#:use-module (guix records)
+ #:use-module ((guix diagnostics) #:select (&fix-hint))
+ #:use-module (guix i18n)
#:use-module (gnu system uuid)
#:re-export (uuid ;backward compatibility
string->uuid
file-system-needed-for-boot?
file-system-flags
file-system-options
+ file-system-options->alist
+ alist->file-system-options
+
file-system-mount?
+ file-system-mount-may-fail?
file-system-check?
file-system-create-mount-point?
file-system-dependencies
file-system-location
file-system-type-predicate
+ btrfs-subvolume?
+ btrfs-store-subvolume-file-name
file-system-label
file-system-label?
%pseudo-file-system-types
%fuse-control-file-system
%binary-format-file-system
+ %debug-file-system
+ %efivars-file-system
%shared-memory-file-system
%pseudo-terminal-file-system
%tty-gid
(default #f))
(mount? file-system-mount? ; Boolean
(default #t))
+ (mount-may-fail? file-system-mount-may-fail? ; Boolean
+ (default #f))
(needed-for-boot? %file-system-needed-for-boot? ; Boolean
(default #f))
(check? file-system-check? ; Boolean
((? string?)
device)))
+(define (file-system-options->alist string)
+ "Translate the option string format of a <file-system> record into an
+association list of options or option/value pairs."
+ (if string
+ (let ((options (string-split string #\,)))
+ (map (lambda (param)
+ (let ((=index (string-index param #\=)))
+ (if =index
+ (cons (string-take param =index)
+ (string-drop param (1+ =index)))
+ param)))
+ options))
+ '()))
+
+(define (alist->file-system-options options)
+ "Return the string representation of OPTIONS, an association list. The
+string obtained can be used as the option field of a <file-system> record."
+ (if (null? options)
+ #f
+ (string-join (map (match-lambda
+ ((key . value)
+ (string-append key "=" value))
+ (key
+ key))
+ options)
+ ",")))
+
(define (file-system-needed-for-boot? fs)
"Return true if FS has the 'needed-for-boot?' flag set, or if it holds the
store--e.g., if FS is the root file system."
"Return a list corresponding to file-system FS that can be passed to the
initrd code."
(match fs
- (($ <file-system> device mount-point type flags options _ _ check?)
+ (($ <file-system> device mount-point type flags options mount?
+ mount-may-fail? needed-for-boot? check?)
+ ;; Note: Add new fields towards the end for compatibility.
(list (cond ((uuid? device)
`(uuid ,(uuid-type device) ,(uuid-bytevector device)))
((file-system-label? device)
`(file-system-label ,(file-system-label->string device)))
(else device))
- mount-point type flags options check?))))
+ mount-point type flags options mount-may-fail? check?))))
(define (spec->file-system sexp)
"Deserialize SEXP, a list, to the corresponding <file-system> object."
(match sexp
- ((device mount-point type flags options check?)
+ ((device mount-point type flags options mount-may-fail? check?
+ _ ...) ;placeholder for new fields
(file-system
(device (match device
(('uuid (? symbol? type) (? bytevector? bv))
device)))
(mount-point mount-point) (type type)
(flags flags) (options options)
+ (mount-may-fail? mount-may-fail?)
(check? check?)))))
(define (specification->file-system-mapping spec writable?)
(type "binfmt_misc")
(check? #f)))
+(define %debug-file-system
+ (file-system
+ (type "debugfs")
+ (device "none")
+ (mount-point "/sys/kernel/debug")
+ (check? #f)
+ (create-mount-point? #t)))
+
+(define %efivars-file-system
+ ;; Support for EFI variables file system.
+ (file-system
+ (device "efivarfs")
+ (mount-point "/sys/firmware/efi/efivars")
+ (type "efivarfs")
+ (mount-may-fail? #t)
+ (needed-for-boot? #f)
+ (check? #f)))
+
(define %tty-gid
;; ID of the 'tty' group. Allocate it statically to make it easy to refer
;; to it from here and from the 'tty' group definitions.
;; parent directory.
(dependencies (list parent))))
'("cpuset" "cpu" "cpuacct" "memory" "devices" "freezer"
- "blkio" "perf_event")))))
+ "blkio" "perf_event" "pids")))))
(define %elogind-file-systems
;; We don't use systemd, but these file systems are needed for elogind,
;; List of basic file systems to be mounted. Note that /proc and /sys are
;; currently mounted by the initrd.
(list %pseudo-terminal-file-system
+ %debug-file-system
%shared-memory-file-system
+ %efivars-file-system
%immutable-store))
;; File systems for Linux containers differ from %base-file-systems in that
;; XXX: On some GNU/Linux systems, /etc/resolv.conf is a
;; symlink to a file in a tmpfs which, for an unknown reason,
;; cannot be bind mounted read-only within the container.
- ;; The same goes with /var/run/nscd, as discussed in
- ;; <https://bugs.gnu.org/37967>.
- (writable? (or (string=? file "/etc/resolv.conf")
- (string=? file "/var/run/nscd")))))
- (cons "/var/run/nscd" %network-configuration-files)))
+ (writable? (string=? file "/etc/resolv.conf"))))
+ %network-configuration-files))
(define (file-system-type-predicate type)
"Return a predicate that, when passed a file system, returns #t if that file
(lambda (fs)
(string=? (file-system-type fs) type)))
+\f
+;;;
+;;; Btrfs specific helpers.
+;;;
+
+(define (btrfs-subvolume? fs)
+ "Predicate to check if FS, a file-system object, is a Btrfs subvolume."
+ (and-let* ((btrfs-file-system? (string= "btrfs" (file-system-type fs)))
+ (option-keys (map (match-lambda
+ ((key . value) key)
+ (key key))
+ (file-system-options->alist
+ (file-system-options fs)))))
+ (find (cut string-prefix? "subvol" <>) option-keys)))
+
+(define (btrfs-store-subvolume-file-name file-systems)
+ "Return the subvolume file name within the Btrfs top level onto which the
+store is located, else #f."
+
+ (define (prepend-slash/maybe s)
+ (if (string=? "/" (string-take s 1))
+ s
+ (string-append "/" s)))
+
+ (define (file-name-depth file-name)
+ (length (string-tokenize file-name %not-slash)))
+
+ (and-let* ((btrfs-subvolume-fs (filter btrfs-subvolume? file-systems))
+ (btrfs-subvolume-fs*
+ (sort btrfs-subvolume-fs
+ (lambda (fs1 fs2)
+ (> (file-name-depth (file-system-mount-point fs1))
+ (file-name-depth (file-system-mount-point fs2))))))
+ (store-subvolume-fs
+ (find (lambda (fs) (file-prefix? (file-system-mount-point fs)
+ (%store-prefix)))
+ btrfs-subvolume-fs*))
+ (options (file-system-options->alist
+ (file-system-options store-subvolume-fs))))
+ ;; XXX: Deriving the subvolume name based from a subvolume ID is not
+ ;; supported, as we'd need to query the actual file system.
+ (or (and=> (assoc-ref options "subvol") prepend-slash/maybe)
+ (raise (condition
+ (&message
+ (message "The store is on a Btrfs subvolume, but the \
+subvolume name is unknown."))
+ (&fix-hint
+ (hint
+ (G_ "Use the @code{subvol} Btrfs file system option."))))))))
+
+
;;; file-systems.scm ends here
HCoop / jackhill / guix / guix.git / blobdiff