351 lines
12 KiB
Scheme
351 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
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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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#:use-module (ice-9 match)
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#:use-module (ice-9 regex)
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#:use-module (guix gexp)
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#:use-module (guix records)
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#:use-module (guix store)
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#:use-module (rnrs bytevectors)
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#:use-module ((gnu build file-systems) #:select (uuid->string))
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#:re-export (uuid->string)
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#:export (<file-system>
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file-system
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file-system?
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file-system-device
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file-system-title
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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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file-system-check?
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file-system-create-mount-point?
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file-system-dependencies
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file-system->spec
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string->uuid
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uuid
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%fuse-control-file-system
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%binary-format-file-system
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%shared-memory-file-system
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%pseudo-terminal-file-system
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%devtmpfs-file-system
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%immutable-store
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%control-groups
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%base-file-systems
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%container-file-systems
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mapped-device
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mapped-device?
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mapped-device-source
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mapped-device-target
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mapped-device-type
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mapped-device-kind
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mapped-device-kind?
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mapped-device-kind-open
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mapped-device-kind-close
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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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%store-mapping))
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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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;;; 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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(title file-system-title ; 'device | 'label | 'uuid
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(default 'device))
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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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(needed-for-boot? %file-system-needed-for-boot? ; Boolean
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(default #f))
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(check? file-system-check? ; Boolean
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(default #t))
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(create-mount-point? file-system-create-mount-point? ; Boolean
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(default #f))
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(dependencies file-system-dependencies ; list of strings (mount
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; points depended on)
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(default '())))
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(define-inlinable (file-system-needed-for-boot? fs)
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"Return true if FS has the 'needed-for-boot?' flag set, or if it's the root
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file system."
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(or (%file-system-needed-for-boot? fs)
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(string=? "/" (file-system-mount-point fs))))
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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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(($ <file-system> device title mount-point type flags options _ check?)
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(list device title mount-point type flags options check?))))
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(define %uuid-rx
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;; The regexp of a UUID.
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(make-regexp "^([[:xdigit:]]{8})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{4})-([[:xdigit:]]{12})$"))
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(define (string->uuid str)
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"Parse STR as a DCE UUID (see <https://tools.ietf.org/html/rfc4122>) and
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return its contents as a 16-byte bytevector. Return #f if STR is not a valid
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UUID representation."
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(and=> (regexp-exec %uuid-rx str)
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(lambda (match)
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(letrec-syntax ((hex->number
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(syntax-rules ()
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((_ index)
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(string->number (match:substring match index)
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16))))
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(put!
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(syntax-rules ()
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((_ bv index (number len) rest ...)
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(begin
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(bytevector-uint-set! bv index number
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(endianness big) len)
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(put! bv (+ index len) rest ...)))
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((_ bv index)
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bv))))
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(let ((time-low (hex->number 1))
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(time-mid (hex->number 2))
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(time-hi (hex->number 3))
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(clock-seq (hex->number 4))
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(node (hex->number 5))
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(uuid (make-bytevector 16)))
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(put! uuid 0
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(time-low 4) (time-mid 2) (time-hi 2)
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(clock-seq 2) (node 6)))))))
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(define-syntax uuid
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(lambda (s)
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"Return the bytevector corresponding to the given UUID representation."
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(syntax-case s ()
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((_ str)
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(string? (syntax->datum #'str))
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;; A literal string: do the conversion at expansion time.
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(let ((bv (string->uuid (syntax->datum #'str))))
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(unless bv
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(syntax-violation 'uuid "invalid UUID" s))
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(datum->syntax #'str bv)))
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((_ str)
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#'(string->uuid str)))))
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;;;
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;;; Common file systems.
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;;;
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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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(define %devtmpfs-file-system
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;; /dev as a 'devtmpfs' file system, needed for udev.
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(file-system
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(device "none")
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(mount-point "/dev")
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(type "devtmpfs")
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(check? #f)
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;; Mount it from the initrd so /dev/pts & co. can then be mounted over it.
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(needed-for-boot? #t)))
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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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996)
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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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(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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(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))))
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(define %control-groups
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(let ((parent (file-system
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(device "cgroup")
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(mount-point "/sys/fs/cgroup")
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(type "tmpfs")
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(check? #f))))
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(cons parent
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(map (lambda (subsystem)
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(file-system
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(device "cgroup")
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(mount-point (string-append "/sys/fs/cgroup/" subsystem))
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(type "cgroup")
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(check? #f)
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(options subsystem)
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(create-mount-point? #t)
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;; This must be mounted after, and unmounted before the
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;; parent directory.
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(dependencies (list parent))))
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'("cpuset" "cpu" "cpuacct" "memory" "devices" "freezer"
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"blkio" "perf_event" "hugetlb")))))
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(define %base-file-systems
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;; List of basic file systems to be mounted. Note that /proc and /sys are
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;; currently mounted by the initrd.
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(append (list %devtmpfs-file-system
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%pseudo-terminal-file-system
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%shared-memory-file-system
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%immutable-store)
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%control-groups))
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;; File systems for Linux containers differ from %base-file-systems in that
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;; they impose additional restrictions such as no-exec or need different
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;; options to function properly.
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;;
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;; The file system flags and options conform to the libcontainer
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;; specification:
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;; https://github.com/docker/libcontainer/blob/master/SPEC.md#filesystem
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(define %container-file-systems
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(list
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;; Pseudo-terminal file system.
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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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(flags '(no-exec no-suid))
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(needed-for-boot? #t)
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(create-mount-point? #t)
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(check? #f)
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(options "newinstance,ptmxmode=0666,mode=620"))
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;; Shared memory file system.
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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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(flags '(no-exec no-suid no-dev))
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(options "mode=1777,size=65536k")
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(needed-for-boot? #t)
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(create-mount-point? #t)
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(check? #f))
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;; Message queue file system.
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(file-system
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(device "mqueue")
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(mount-point "/dev/mqueue")
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(type "mqueue")
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(flags '(no-exec no-suid no-dev))
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(needed-for-boot? #t)
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(create-mount-point? #t)
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(check? #f))))
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;;;
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;;; Mapped devices, for Linux's device-mapper.
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;;;
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(define-record-type* <mapped-device> mapped-device
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make-mapped-device
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mapped-device?
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(source mapped-device-source) ;string
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(target mapped-device-target) ;string
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(type mapped-device-type)) ;<mapped-device-kind>
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(define-record-type* <mapped-device-type> mapped-device-kind
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make-mapped-device-kind
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mapped-device-kind?
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(open mapped-device-kind-open) ;source target -> gexp
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(close mapped-device-kind-close ;source target -> gexp
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(default (const #~(const #f)))))
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;;;
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;;; Shared file systems, for VMs/containers.
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;;;
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;; Mapping of host file system SOURCE to mount point TARGET in the guest.
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(define-record-type* <file-system-mapping> file-system-mapping
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make-file-system-mapping
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file-system-mapping?
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(source file-system-mapping-source) ;string
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(target file-system-mapping-target) ;string
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(writable? file-system-mapping-writable? ;Boolean
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(default #f)))
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(define %store-mapping
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;; Mapping of the host's store into the guest.
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(file-system-mapping
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(source (%store-prefix))
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(target (%store-prefix))
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(writable? #f)))
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;;; file-systems.scm ends here
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