2014-05-20 19:59:08 +00:00
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;;; GNU Guix --- Functional package management for GNU
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2018-04-27 13:31:37 +00:00
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;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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2014-05-20 19:59:08 +00:00
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu system file-systems)
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2015-06-28 04:39:43 +00:00
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#:use-module (ice-9 match)
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2017-10-03 20:27:27 +00:00
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#:use-module (rnrs bytevectors)
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2017-02-06 14:42:00 +00:00
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#:use-module (srfi srfi-1)
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2014-05-20 19:59:08 +00:00
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#:use-module (guix records)
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2017-09-06 07:28:28 +00:00
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#:use-module (gnu system uuid)
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file-systems: Introduce (gnu system uuid).
* gnu/build/file-systems.scm (sub-bytevector)
(latin1->string, %fat32-endianness, fat32-uuid->string)
(%iso9660-uuid-rx, string->iso9660-uuid)
(iso9660-uuid->string, %network-byte-order)
(dce-uuid->string, %uuid-rx, string->dce-uuid)
(string->ext2-uuid, string->ext3-uuid, string->ext4-uuid)
(vhashq, %uuid-parsers, %uuid-printers, string->uuid)
(uuid->string): Move to...
* gnu/system/uuid.scm: ... here. New file.
* gnu/system/file-systems.scm (uuid): Move to the above file.
* gnu/system/vm.scm: Adjust accordingly.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add uuid.scm.
2017-09-05 19:51:12 +00:00
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#:re-export (uuid ;backward compatibility
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string->uuid
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2016-01-01 21:41:35 +00:00
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uuid->string)
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2018-05-18 08:11:17 +00:00
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#:export (file-system
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2014-05-20 19:59:08 +00:00
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file-system?
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file-system-device
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2014-06-02 21:58:50 +00:00
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file-system-title
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2014-05-20 19:59:08 +00:00
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file-system-mount-point
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file-system-type
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file-system-needed-for-boot?
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file-system-flags
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file-system-options
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2015-12-21 23:25:40 +00:00
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file-system-mount?
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2014-07-22 20:53:36 +00:00
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file-system-check?
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file-system-create-mount-point?
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2015-07-17 17:24:15 +00:00
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file-system-dependencies
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2017-10-04 19:35:31 +00:00
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file-system-location
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2014-05-20 19:59:08 +00:00
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2017-03-21 20:55:20 +00:00
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file-system-type-predicate
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2015-06-28 04:39:43 +00:00
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file-system->spec
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2016-11-10 16:45:54 +00:00
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spec->file-system
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2016-08-04 17:08:08 +00:00
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specification->file-system-mapping
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2015-06-28 04:39:43 +00:00
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2018-04-27 13:31:37 +00:00
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%pseudo-file-system-types
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2014-05-20 19:59:08 +00:00
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%fuse-control-file-system
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2014-07-22 14:57:57 +00:00
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%binary-format-file-system
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2014-07-23 06:13:34 +00:00
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%shared-memory-file-system
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%pseudo-terminal-file-system
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2016-09-27 09:20:40 +00:00
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%tty-gid
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2015-04-20 20:21:51 +00:00
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%immutable-store
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2015-06-19 00:40:57 +00:00
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%control-groups
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2015-09-03 20:58:08 +00:00
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%elogind-file-systems
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2014-07-22 14:57:57 +00:00
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2014-09-11 21:39:15 +00:00
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%base-file-systems
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2015-06-28 04:42:16 +00:00
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%container-file-systems
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2014-09-11 21:39:15 +00:00
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2015-06-27 14:45:34 +00:00
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<file-system-mapping>
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file-system-mapping
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file-system-mapping?
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file-system-mapping-source
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file-system-mapping-target
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file-system-mapping-writable?
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2017-02-02 23:20:40 +00:00
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file-system-mapping->bind-mount
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2017-02-06 14:42:00 +00:00
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%store-mapping
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%network-configuration-files
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%network-file-mappings))
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2014-05-20 19:59:08 +00:00
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;;; Commentary:
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;;;
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;;; Declaring file systems to be mounted.
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;;;
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2017-03-21 20:55:20 +00:00
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;;; Note: this file system is used both in the Shepherd and on the "host
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;;; side", so it must not include (gnu packages …) modules.
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;;;
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2014-05-20 19:59:08 +00:00
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;;; Code:
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;; File system declaration.
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(define-record-type* <file-system> file-system
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make-file-system
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file-system?
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(device file-system-device) ; string
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2014-06-02 21:58:50 +00:00
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(title file-system-title ; 'device | 'label | 'uuid
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(default 'device))
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2014-05-20 19:59:08 +00:00
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(mount-point file-system-mount-point) ; string
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(type file-system-type) ; string
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(flags file-system-flags ; list of symbols
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(default '()))
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(options file-system-options ; string or #f
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(default #f))
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2015-12-21 23:25:40 +00:00
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(mount? file-system-mount? ; Boolean
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(default #t))
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2014-11-25 15:01:21 +00:00
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(needed-for-boot? %file-system-needed-for-boot? ; Boolean
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2014-05-20 19:59:08 +00:00
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(default #f))
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(check? file-system-check? ; Boolean
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2014-07-22 20:53:36 +00:00
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(default #t))
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(create-mount-point? file-system-create-mount-point? ; Boolean
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2015-07-17 17:24:15 +00:00
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(default #f))
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2015-10-29 17:22:19 +00:00
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(dependencies file-system-dependencies ; list of <file-system>
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2017-10-04 19:35:31 +00:00
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(default '())) ; or <mapped-device>
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(location file-system-location
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(default (current-source-location))
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(innate)))
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2014-05-20 19:59:08 +00:00
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2017-02-03 10:26:25 +00:00
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;; Note: This module is used both on the build side and on the host side.
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;; Arrange not to pull (guix store) and (guix config) because the latter
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;; differs from user to user.
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(define (%store-prefix)
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"Return the store prefix."
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(cond ((resolve-module '(guix store) #:ensure #f)
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=>
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(lambda (store)
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((module-ref store '%store-prefix))))
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((getenv "NIX_STORE")
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=> identity)
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(else
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"/gnu/store")))
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2017-01-16 21:33:46 +00:00
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(define %not-slash
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(char-set-complement (char-set #\/)))
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(define (file-prefix? file1 file2)
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"Return #t if FILE1 denotes the name of a file that is a parent of FILE2,
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where both FILE1 and FILE2 are absolute file name. For example:
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(file-prefix? \"/gnu\" \"/gnu/store\")
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=> #t
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(file-prefix? \"/gn\" \"/gnu/store\")
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=> #f
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"
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(and (string-prefix? "/" file1)
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(string-prefix? "/" file2)
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(let loop ((file1 (string-tokenize file1 %not-slash))
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(file2 (string-tokenize file2 %not-slash)))
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(match file1
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(()
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#t)
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((head1 tail1 ...)
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(match file2
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((head2 tail2 ...)
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(and (string=? head1 head2) (loop tail1 tail2)))
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(()
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#f)))))))
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(define (file-system-needed-for-boot? fs)
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"Return true if FS has the 'needed-for-boot?' flag set, or if it holds the
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store--e.g., if FS is the root file system."
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2014-11-25 15:01:21 +00:00
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(or (%file-system-needed-for-boot? fs)
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2017-01-16 21:33:46 +00:00
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(and (file-prefix? (file-system-mount-point fs) (%store-prefix))
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(not (memq 'bind-mount (file-system-flags fs))))))
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2014-11-25 15:01:21 +00:00
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2015-06-28 04:39:43 +00:00
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(define (file-system->spec fs)
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"Return a list corresponding to file-system FS that can be passed to the
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initrd code."
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(match fs
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2015-12-21 23:25:40 +00:00
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(($ <file-system> device title mount-point type flags options _ _ check?)
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2017-09-06 07:28:28 +00:00
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(list (if (uuid? device)
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2017-10-03 20:27:27 +00:00
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`(uuid ,(uuid-type device) ,(uuid-bytevector device))
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2017-09-06 07:28:28 +00:00
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device)
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title mount-point type flags options check?))))
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2015-06-28 04:39:43 +00:00
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2016-11-10 16:45:54 +00:00
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(define (spec->file-system sexp)
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"Deserialize SEXP, a list, to the corresponding <file-system> object."
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(match sexp
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((device title mount-point type flags options check?)
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(file-system
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2017-10-03 20:27:27 +00:00
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(device (match device
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(('uuid (? symbol? type) (? bytevector? bv))
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(bytevector->uuid bv type))
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(_
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device)))
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(title title)
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2016-11-10 16:45:54 +00:00
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(mount-point mount-point) (type type)
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(flags flags) (options options)
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(check? check?)))))
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2016-08-04 17:08:08 +00:00
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(define (specification->file-system-mapping spec writable?)
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"Read the SPEC and return the corresponding <file-system-mapping>. SPEC is
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a string of the form \"SOURCE\" or \"SOURCE=TARGET\". The former specifies
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that SOURCE from the host should be mounted at SOURCE in the other system.
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The latter format specifies that SOURCE from the host should be mounted at
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TARGET in the other system."
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(let ((index (string-index spec #\=)))
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(if index
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(file-system-mapping
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(source (substring spec 0 index))
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(target (substring spec (+ 1 index)))
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(writable? writable?))
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(file-system-mapping
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(source spec)
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(target spec)
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(writable? writable?)))))
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2015-07-14 13:06:46 +00:00
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;;;
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;;; Common file systems.
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;;;
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2018-04-27 13:31:37 +00:00
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(define %pseudo-file-system-types
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;; List of know pseudo file system types. This is used when validating file
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;; system definitions.
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2018-04-29 15:40:03 +00:00
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'("binfmt_misc" "cgroup" "debugfs" "devpts" "devtmpfs" "efivarfs" "fusectl"
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"hugetlbfs" "overlay" "proc" "securityfs" "sysfs" "tmpfs"))
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2018-04-27 13:31:37 +00:00
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2014-05-20 19:59:08 +00:00
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(define %fuse-control-file-system
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;; Control file system for Linux' file systems in user-space (FUSE).
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(file-system
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(device "fusectl")
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(mount-point "/sys/fs/fuse/connections")
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(type "fusectl")
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(check? #f)))
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(define %binary-format-file-system
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;; Support for arbitrary executable binary format.
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(file-system
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(device "binfmt_misc")
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(mount-point "/proc/sys/fs/binfmt_misc")
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(type "binfmt_misc")
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(check? #f)))
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2014-07-22 21:13:53 +00:00
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(define %tty-gid
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;; ID of the 'tty' group. Allocate it statically to make it easy to refer
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;; to it from here and from the 'tty' group definitions.
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2014-07-24 22:12:35 +00:00
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996)
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2014-07-22 21:13:53 +00:00
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(define %pseudo-terminal-file-system
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;; The pseudo-terminal file system. It needs to be mounted so that
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;; statfs(2) returns DEVPTS_SUPER_MAGIC like libc's getpt(3) expects (and
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;; thus openpty(3) and its users, such as xterm.)
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(file-system
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(device "none")
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(mount-point "/dev/pts")
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(type "devpts")
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(check? #f)
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(needed-for-boot? #f)
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(create-mount-point? #t)
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(options (string-append "gid=" (number->string %tty-gid) ",mode=620"))))
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2014-07-22 14:57:57 +00:00
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2014-07-22 23:25:01 +00:00
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(define %shared-memory-file-system
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;; Shared memory.
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(file-system
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(device "tmpfs")
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(mount-point "/dev/shm")
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(type "tmpfs")
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(check? #f)
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(flags '(no-suid no-dev))
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(options "size=50%") ;TODO: make size configurable
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(create-mount-point? #t)))
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2015-04-20 20:21:51 +00:00
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(define %immutable-store
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;; Read-only store to avoid users or daemons accidentally modifying it.
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;; 'guix-daemon' has provisions to remount it read-write in its own name
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;; space.
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(file-system
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(device (%store-prefix))
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(mount-point (%store-prefix))
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(type "none")
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(check? #f)
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(flags '(read-only bind-mount))))
|
|
|
|
|
|
2015-06-19 00:40:57 +00:00
|
|
|
|
(define %control-groups
|
2015-07-17 17:25:09 +00:00
|
|
|
|
(let ((parent (file-system
|
|
|
|
|
(device "cgroup")
|
|
|
|
|
(mount-point "/sys/fs/cgroup")
|
|
|
|
|
(type "tmpfs")
|
|
|
|
|
(check? #f))))
|
|
|
|
|
(cons parent
|
|
|
|
|
(map (lambda (subsystem)
|
|
|
|
|
(file-system
|
|
|
|
|
(device "cgroup")
|
|
|
|
|
(mount-point (string-append "/sys/fs/cgroup/" subsystem))
|
|
|
|
|
(type "cgroup")
|
|
|
|
|
(check? #f)
|
|
|
|
|
(options subsystem)
|
|
|
|
|
(create-mount-point? #t)
|
|
|
|
|
|
|
|
|
|
;; This must be mounted after, and unmounted before the
|
|
|
|
|
;; parent directory.
|
|
|
|
|
(dependencies (list parent))))
|
|
|
|
|
'("cpuset" "cpu" "cpuacct" "memory" "devices" "freezer"
|
2017-12-22 07:42:29 +00:00
|
|
|
|
"blkio" "perf_event")))))
|
2015-06-19 00:40:57 +00:00
|
|
|
|
|
2015-09-03 20:58:08 +00:00
|
|
|
|
(define %elogind-file-systems
|
|
|
|
|
;; We don't use systemd, but these file systems are needed for elogind,
|
|
|
|
|
;; which was extracted from systemd.
|
2017-12-22 07:43:24 +00:00
|
|
|
|
(append
|
|
|
|
|
(list (file-system
|
|
|
|
|
(device "none")
|
|
|
|
|
(mount-point "/run/systemd")
|
|
|
|
|
(type "tmpfs")
|
|
|
|
|
(check? #f)
|
|
|
|
|
(flags '(no-suid no-dev no-exec))
|
|
|
|
|
(options "mode=0755")
|
|
|
|
|
(create-mount-point? #t))
|
|
|
|
|
(file-system
|
|
|
|
|
(device "none")
|
|
|
|
|
(mount-point "/run/user")
|
|
|
|
|
(type "tmpfs")
|
|
|
|
|
(check? #f)
|
|
|
|
|
(flags '(no-suid no-dev no-exec))
|
|
|
|
|
(options "mode=0755")
|
|
|
|
|
(create-mount-point? #t))
|
|
|
|
|
;; Elogind uses cgroups to organize processes, allowing it to map PIDs
|
|
|
|
|
;; to sessions. Elogind's cgroup hierarchy isn't associated with any
|
|
|
|
|
;; resource controller ("subsystem").
|
|
|
|
|
(file-system
|
|
|
|
|
(device "cgroup")
|
|
|
|
|
(mount-point "/sys/fs/cgroup/elogind")
|
|
|
|
|
(type "cgroup")
|
|
|
|
|
(check? #f)
|
|
|
|
|
(options "none,name=elogind")
|
|
|
|
|
(create-mount-point? #t)
|
|
|
|
|
(dependencies (list (car %control-groups)))))
|
|
|
|
|
%control-groups))
|
2015-09-03 20:58:08 +00:00
|
|
|
|
|
2014-07-22 14:57:57 +00:00
|
|
|
|
(define %base-file-systems
|
|
|
|
|
;; List of basic file systems to be mounted. Note that /proc and /sys are
|
|
|
|
|
;; currently mounted by the initrd.
|
2017-12-22 07:43:24 +00:00
|
|
|
|
(list %pseudo-terminal-file-system
|
|
|
|
|
%shared-memory-file-system
|
|
|
|
|
%immutable-store))
|
2014-07-22 14:57:57 +00:00
|
|
|
|
|
2015-06-28 04:42:16 +00:00
|
|
|
|
;; File systems for Linux containers differ from %base-file-systems in that
|
|
|
|
|
;; they impose additional restrictions such as no-exec or need different
|
|
|
|
|
;; options to function properly.
|
|
|
|
|
;;
|
|
|
|
|
;; The file system flags and options conform to the libcontainer
|
|
|
|
|
;; specification:
|
|
|
|
|
;; https://github.com/docker/libcontainer/blob/master/SPEC.md#filesystem
|
|
|
|
|
(define %container-file-systems
|
|
|
|
|
(list
|
2015-07-13 14:10:40 +00:00
|
|
|
|
;; Pseudo-terminal file system.
|
2015-06-28 04:42:16 +00:00
|
|
|
|
(file-system
|
|
|
|
|
(device "none")
|
|
|
|
|
(mount-point "/dev/pts")
|
|
|
|
|
(type "devpts")
|
|
|
|
|
(flags '(no-exec no-suid))
|
|
|
|
|
(needed-for-boot? #t)
|
|
|
|
|
(create-mount-point? #t)
|
|
|
|
|
(check? #f)
|
|
|
|
|
(options "newinstance,ptmxmode=0666,mode=620"))
|
|
|
|
|
;; Shared memory file system.
|
|
|
|
|
(file-system
|
|
|
|
|
(device "tmpfs")
|
|
|
|
|
(mount-point "/dev/shm")
|
|
|
|
|
(type "tmpfs")
|
|
|
|
|
(flags '(no-exec no-suid no-dev))
|
|
|
|
|
(options "mode=1777,size=65536k")
|
|
|
|
|
(needed-for-boot? #t)
|
|
|
|
|
(create-mount-point? #t)
|
|
|
|
|
(check? #f))
|
|
|
|
|
;; Message queue file system.
|
|
|
|
|
(file-system
|
|
|
|
|
(device "mqueue")
|
|
|
|
|
(mount-point "/dev/mqueue")
|
|
|
|
|
(type "mqueue")
|
|
|
|
|
(flags '(no-exec no-suid no-dev))
|
|
|
|
|
(needed-for-boot? #t)
|
|
|
|
|
(create-mount-point? #t)
|
|
|
|
|
(check? #f))))
|
|
|
|
|
|
2015-06-27 14:45:34 +00:00
|
|
|
|
|
|
|
|
|
;;;
|
|
|
|
|
;;; Shared file systems, for VMs/containers.
|
|
|
|
|
;;;
|
|
|
|
|
|
|
|
|
|
;; Mapping of host file system SOURCE to mount point TARGET in the guest.
|
|
|
|
|
(define-record-type* <file-system-mapping> file-system-mapping
|
|
|
|
|
make-file-system-mapping
|
|
|
|
|
file-system-mapping?
|
|
|
|
|
(source file-system-mapping-source) ;string
|
|
|
|
|
(target file-system-mapping-target) ;string
|
|
|
|
|
(writable? file-system-mapping-writable? ;Boolean
|
|
|
|
|
(default #f)))
|
|
|
|
|
|
2017-02-02 23:20:40 +00:00
|
|
|
|
(define (file-system-mapping->bind-mount mapping)
|
|
|
|
|
"Return a file system that realizes MAPPING, a <file-system-mapping>, using
|
|
|
|
|
a bind mount."
|
|
|
|
|
(match mapping
|
|
|
|
|
(($ <file-system-mapping> source target writable?)
|
|
|
|
|
(file-system
|
|
|
|
|
(mount-point target)
|
|
|
|
|
(device source)
|
|
|
|
|
(type "none")
|
|
|
|
|
(flags (if writable?
|
|
|
|
|
'(bind-mount)
|
|
|
|
|
'(bind-mount read-only)))
|
|
|
|
|
(check? #f)
|
|
|
|
|
(create-mount-point? #t)))))
|
|
|
|
|
|
2015-06-27 14:45:34 +00:00
|
|
|
|
(define %store-mapping
|
|
|
|
|
;; Mapping of the host's store into the guest.
|
|
|
|
|
(file-system-mapping
|
|
|
|
|
(source (%store-prefix))
|
|
|
|
|
(target (%store-prefix))
|
|
|
|
|
(writable? #f)))
|
|
|
|
|
|
2017-02-06 14:42:00 +00:00
|
|
|
|
(define %network-configuration-files
|
|
|
|
|
;; List of essential network configuration files.
|
|
|
|
|
'("/etc/resolv.conf"
|
|
|
|
|
"/etc/nsswitch.conf"
|
|
|
|
|
"/etc/services"
|
|
|
|
|
"/etc/hosts"))
|
|
|
|
|
|
|
|
|
|
(define %network-file-mappings
|
|
|
|
|
;; List of file mappings for essential network files.
|
|
|
|
|
(filter-map (lambda (file)
|
|
|
|
|
(file-system-mapping
|
|
|
|
|
(source file)
|
|
|
|
|
(target file)
|
|
|
|
|
;; 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.
|
|
|
|
|
(writable? (string=? file "/etc/resolv.conf"))))
|
|
|
|
|
%network-configuration-files))
|
|
|
|
|
|
2017-03-18 09:38:51 +00:00
|
|
|
|
(define (file-system-type-predicate type)
|
2017-03-21 21:07:08 +00:00
|
|
|
|
"Return a predicate that, when passed a file system, returns #t if that file
|
|
|
|
|
system has the given TYPE."
|
2017-03-18 09:38:51 +00:00
|
|
|
|
(lambda (fs)
|
|
|
|
|
(string=? (file-system-type fs) type)))
|
|
|
|
|
|
2014-05-20 19:59:08 +00:00
|
|
|
|
;;; file-systems.scm ends here
|