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e041801e61
* gnu/build/hurd-boot.scm (boot-hurd-system): Symlink /hurd before setting up translators. Reviewed-by: Janneke Nieuwenhuizen <janneke@gnu.org>
312 lines
12 KiB
Scheme
312 lines
12 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2020-2022 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@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 build hurd-boot)
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#:use-module (system repl error-handling)
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#:autoload (system repl repl) (start-repl)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 match)
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#:use-module (guix build utils)
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#:use-module ((guix build syscalls)
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#:hide (file-system-type))
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#:export (make-hurd-device-nodes
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boot-hurd-system))
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;;; Commentary:
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;;;
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;;; Utility procedures useful to boot a Hurd system.
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;;;
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;;; Code:
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;; XXX FIXME c&p from linux-boot.scm
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(define (find-long-option option arguments)
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"Find OPTION among ARGUMENTS, where OPTION is something like \"--load\".
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Return the value associated with OPTION, or #f on failure."
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(let ((opt (string-append option "=")))
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(and=> (find (cut string-prefix? opt <>)
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arguments)
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(lambda (arg)
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(substring arg (+ 1 (string-index arg #\=)))))))
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;; XXX FIXME c&p from guix/utils.scm
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(define (readlink* file)
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"Call 'readlink' until the result is not a symlink."
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(define %max-symlink-depth 50)
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(let loop ((file file)
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(depth 0))
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(define (absolute target)
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(if (absolute-file-name? target)
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target
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(string-append (dirname file) "/" target)))
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(if (>= depth %max-symlink-depth)
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file
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(call-with-values
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(lambda ()
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(catch 'system-error
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(lambda ()
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(values #t (readlink file)))
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(lambda args
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(let ((errno (system-error-errno args)))
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(if (or (= errno EINVAL))
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(values #f file)
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(apply throw args))))))
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(lambda (success? target)
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(if success?
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(loop (absolute target) (+ depth 1))
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file))))))
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(define* (make-hurd-device-nodes #:optional (root "/"))
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"Make some of the nodes needed on GNU/Hurd."
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(define (scope dir)
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(string-append root (if (string-suffix? "/" root) "" "/") dir))
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(mkdir (scope "dev"))
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;; Don't create /dev/null etc just yet; the store
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;; messes-up the permission bits.
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;; Don't create /dev/console, /dev/vcs, etc.: they are created by
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;; console-run on first boot.
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(mkdir (scope "servers"))
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(for-each (lambda (file)
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(call-with-output-file (scope (string-append "servers/" file))
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(lambda (port)
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(display file port) ;avoid hard-linking
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(chmod port #o444))))
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'("startup"
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"exec"
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"proc"
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"password"
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"default-pager"
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"crash-dump-core"
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"kill"
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"suspend"))
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(mkdir (scope "servers/socket"))
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;; Don't create /servers/socket/1 & co: runsystem does that on first boot.
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;; TODO: Set the 'gnu.translator' extended attribute for passive translator
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;; settings?
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)
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(define (passive-translator-xattr? file-name)
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"Return true if FILE-NAME has an extended @code{gnu.translator} attribute
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set."
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(catch 'system-error
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(lambda _ (not (string-null? (getxattr file-name "gnu.translator"))))
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(lambda args
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(if (= ENODATA (system-error-errno args))
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#f
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(apply throw args)))))
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(define (passive-translator-installed? file-name)
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"Return true if @file{showtrans} finds a translator installed on FILE-NAME."
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(with-output-to-port (%make-void-port "w")
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(lambda _
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(with-error-to-port (%make-void-port "w")
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(lambda _
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(zero? (system* "showtrans" "--silent" file-name)))))))
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(define (translated? file-name)
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"Return true if a translator is installed on FILE-NAME."
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;; On GNU/Hurd, 'getxattr' in glibc opens the file without O_NOTRANS, and
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;; then, for "gnu.translator", it calls 'file_get_translator', resulting in
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;; EOPNOTSUPP (conversely, 'showtrans' opens the file with O_NOTRANS).
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(if (string-contains %host-type "linux-gnu")
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(passive-translator-xattr? file-name)
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(passive-translator-installed? file-name)))
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(define* (set-translator file-name command #:optional (mode #o600))
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"Setup translator COMMAND on FILE-NAME."
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(unless (translated? file-name)
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(let ((dir (dirname file-name)))
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(unless (directory-exists? dir)
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(mkdir-p dir))
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(unless (file-exists? file-name)
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(call-with-output-file file-name
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(lambda (port)
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(display file-name port) ;avoid hard-linking
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(chmod port mode)))))
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(catch 'system-error
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(lambda _
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(setxattr file-name "gnu.translator" (string-join command "\0" 'suffix)))
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(lambda (key . args)
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(let ((errno (system-error-errno (cons key args))))
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(format (current-error-port) "~a: ~a\n"
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(strerror errno) file-name)
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(format (current-error-port) "Ignoring...Good Luck!\n"))))))
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(define-syntax-rule (false-if-EEXIST exp)
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"Evaluate EXP but return #f if it raises to 'system-error with EEXIST."
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(catch 'system-error
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(lambda () exp)
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(lambda args
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(if (= EEXIST (system-error-errno args))
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#f
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(apply throw args)))))
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(define* (set-hurd-device-translators #:optional (root "/"))
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"Make some of the device nodes needed on GNU/Hurd."
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(define (scope dir)
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(string-append root (if (string-suffix? "/" root) "" "/") dir))
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(define scope-set-translator
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(match-lambda
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((file-name command)
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(scope-set-translator (list file-name command #o600)))
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((file-name command mode)
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(let ((mount-point (scope file-name)))
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(set-translator mount-point command mode)))))
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(define (mkdir* dir)
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(let ((dir (scope dir)))
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(unless (file-exists? dir)
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(mkdir-p dir))))
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(define servers
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'(("servers/crash-dump-core" ("/hurd/crash" "--dump-core"))
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("servers/crash-kill" ("/hurd/crash" "--kill"))
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("servers/crash-suspend" ("/hurd/crash" "--suspend"))
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("servers/password" ("/hurd/password"))
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("servers/socket/1" ("/hurd/pflocal"))
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;; /servers/socket/2 and /26 are created by 'static-networking-service'.
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;; XXX: Spawn pfinet without arguments on these nodes so that a DHCP
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;; client has someone to talk to?
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("proc" ("/hurd/procfs" "--stat-mode=444"))))
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(define devices
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`(("dev/full" ("/hurd/null" "--full") #o666)
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("dev/null" ("/hurd/null") #o666)
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("dev/random" ("/hurd/random" "--seed-file" "/var/lib/random-seed")
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#o644)
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("dev/zero" ("/hurd/storeio" "--store-type=zero") #o666)
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("dev/console" ("/hurd/term" "/dev/console" "device" "console"))
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("dev/klog" ("/hurd/streamio" "kmsg"))
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("dev/mem" ("/hurd/storeio" "--no-cache" "mem") #o660)
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("dev/shm" ("/hurd/tmpfs" "--mode=1777" "50%") #o644)
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("dev/time" ("/hurd/storeio" "--no-cache" "time") #o644)
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("dev/vcs" ("/hurd/console"))
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("dev/tty" ("/hurd/magic" "tty") #o666)
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;; 'fd_to_filename' in libc expects it.
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("dev/fd" ("/hurd/magic" "--directory" "fd") #o555)
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;; Create a number of ttys; syslogd writes to tty12 by default.
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;; FIXME: Creating /dev/tty12 leads the console client to switch to
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;; tty12 when syslogd starts, which is confusing for users. Thus, do
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;; not create tty12.
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,@(map (lambda (n)
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(let ((n (number->string n)))
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`(,(string-append "dev/tty" n)
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("/hurd/term" ,(string-append "/dev/tty" n)
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"hurdio" ,(string-append "/dev/vcs/" n "/console"))
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#o666)))
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(iota 11 1))
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,@(append-map (lambda (n)
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(let ((n (number->string n)))
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`((,(string-append "dev/ptyp" n)
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("/hurd/term" ,(string-append "/dev/ptyp" n)
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"pty-master" ,(string-append "/dev/ttyp" n))
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#o666)
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(,(string-append "dev/ttyp" n)
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("/hurd/term" ,(string-append "/dev/ttyp" n)
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"pty-slave" ,(string-append "/dev/ptyp" n))
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#o666))))
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(iota 10 0))))
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(for-each scope-set-translator servers)
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(mkdir* "dev/vcs/1")
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(mkdir* "dev/vcs/2")
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(rename-file (scope "dev/console") (scope "dev/console-"))
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(for-each scope-set-translator devices)
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(false-if-EEXIST (symlink "/dev/random" (scope "dev/urandom")))
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(false-if-EEXIST (symlink "/dev/fd/0" (scope "dev/stdin")))
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(false-if-EEXIST (symlink "/dev/fd/1" (scope "dev/stdout")))
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(false-if-EEXIST (symlink "/dev/fd/2" (scope "dev/stderr")))
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(false-if-EEXIST (symlink "crash-dump-core" (scope "servers/crash")))
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;; Make sure /etc/mtab is a symlink to /proc/mounts.
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(false-if-exception (delete-file (scope "etc/mtab")))
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(mkdir* (scope "etc"))
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(symlink "/proc/mounts" (scope "etc/mtab")))
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(define* (boot-hurd-system #:key (on-error 'debug))
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"This procedure is meant to be called from an early RC script.
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Install the relevant passive translators on the first boot. Then, run system
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activation by using the kernel command-line options 'gnu.system' and 'gnu.load';
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starting the Shepherd.
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XXX TODO: see linux-boot.scm:boot-system.
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XXX TODO: add proper file-system checking, mounting
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XXX TODO: move bits to (new?) (hurd?) (activation?) services
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XXX TODO: use Linux xattr/setxattr to remove (settrans in) /libexec/RUNSYSTEM
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"
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(display "Welcome, this is GNU's early boot Guile.\n")
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(display "Use 'gnu.repl' for an initrd REPL.\n\n")
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(call-with-error-handling
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(lambda ()
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(let* ((args (command-line))
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(system (find-long-option "gnu.system" args))
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(to-load (find-long-option "gnu.load" args)))
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(false-if-exception (delete-file "/hurd"))
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(let ((hurd/hurd (readlink* (string-append system "/profile/hurd"))))
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(symlink hurd/hurd "/hurd"))
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(format #t "Setting-up essential translators...\n")
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(setenv "PATH" (string-append system "/profile/bin"))
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(set-hurd-device-translators)
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(format #t "Starting pager...\n")
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(unless (zero? (system* "/hurd/mach-defpager"))
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(format #t "FAILED...Good luck!\n"))
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(cond ((member "gnu.repl" args)
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(format #t "Starting repl...\n")
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(start-repl))
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(to-load
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(format #t "loading '~a'...\n" to-load)
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(primitive-load to-load)
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(format (current-error-port)
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"boot program '~a' terminated, rebooting~%"
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to-load)
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(sleep 2)
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(reboot))
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(else
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(display "no boot file passed via 'gnu.load'\n")
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(display "entering a warm and cozy REPL\n")
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(start-repl)))))
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#:on-error on-error))
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;;; hurd-boot.scm ends here
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