761 lines
28 KiB
Scheme
761 lines
28 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2017 Ryan Moe <ryan.moe@gmail.com>
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;;; Copyright © 2018 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 services virtualization)
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#:use-module (gnu services)
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#:use-module (gnu services configuration)
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#:use-module (gnu services base)
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#:use-module (gnu services dbus)
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#:use-module (gnu services shepherd)
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#:use-module (gnu system shadow)
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#:use-module (gnu system file-systems)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages virtualization)
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#:use-module (guix records)
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#:use-module (guix gexp)
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#:use-module (guix packages)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-26)
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#:use-module (rnrs bytevectors)
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#:use-module (ice-9 match)
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#:export (libvirt-configuration
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libvirt-service-type
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virtlog-configuration
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virtlog-service-type
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%qemu-platforms
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lookup-qemu-platforms
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qemu-platform?
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qemu-platform-name
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qemu-binfmt-configuration
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qemu-binfmt-configuration?
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qemu-binfmt-service-type))
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(define (uglify-field-name field-name)
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(let ((str (symbol->string field-name)))
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(string-join
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(string-split (string-delete #\? str) #\-)
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"_")))
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(define (quote-val val)
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(string-append "\"" val "\""))
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(define (serialize-field field-name val)
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(format #t "~a = ~a\n" (uglify-field-name field-name) val))
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(define (serialize-string field-name val)
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(serialize-field field-name (quote-val val)))
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(define (serialize-boolean field-name val)
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(serialize-field field-name (if val 1 0)))
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(define (serialize-integer field-name val)
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(serialize-field field-name val))
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(define (build-opt-list val)
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(string-append
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"["
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(string-join (map quote-val val) ",")
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"]"))
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(define optional-list? list?)
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(define optional-string? string?)
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(define (serialize-list field-name val)
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(serialize-field field-name (build-opt-list val)))
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(define (serialize-optional-list field-name val)
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(if (null? val)
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(format #t "# ~a = []\n" (uglify-field-name field-name))
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(serialize-list field-name val)))
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(define (serialize-optional-string field-name val)
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(if (string-null? val)
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(format #t "# ~a = \"\"\n" (uglify-field-name field-name))
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(serialize-string field-name val)))
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(define-configuration libvirt-configuration
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(libvirt
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(package libvirt)
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"Libvirt package.")
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(listen-tls?
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(boolean #t)
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"Flag listening for secure TLS connections on the public TCP/IP port.
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must set @code{listen} for this to have any effect.
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It is necessary to setup a CA and issue server certificates before
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using this capability.")
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(listen-tcp?
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(boolean #f)
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"Listen for unencrypted TCP connections on the public TCP/IP port.
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must set @code{listen} for this to have any effect.
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Using the TCP socket requires SASL authentication by default. Only
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SASL mechanisms which support data encryption are allowed. This is
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DIGEST_MD5 and GSSAPI (Kerberos5)")
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(tls-port
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(string "16514")
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"Port for accepting secure TLS connections This can be a port number,
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or service name")
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(tcp-port
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(string "16509")
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"Port for accepting insecure TCP connections This can be a port number,
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or service name")
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(listen-addr
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(string "0.0.0.0")
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"IP address or hostname used for client connections.")
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(mdns-adv?
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(boolean #f)
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"Flag toggling mDNS advertisement of the libvirt service.
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Alternatively can disable for all services on a host by
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stopping the Avahi daemon.")
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(mdns-name
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(string (string-append "Virtualization Host " (gethostname)))
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"Default mDNS advertisement name. This must be unique on the
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immediate broadcast network.")
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(unix-sock-group
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(string "root")
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"UNIX domain socket group ownership. This can be used to
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allow a 'trusted' set of users access to management capabilities
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without becoming root.")
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(unix-sock-ro-perms
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(string "0777")
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"UNIX socket permissions for the R/O socket. This is used
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for monitoring VM status only.")
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(unix-sock-rw-perms
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(string "0770")
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"UNIX socket permissions for the R/W socket. Default allows
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only root. If PolicyKit is enabled on the socket, the default
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will change to allow everyone (eg, 0777)")
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(unix-sock-admin-perms
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(string "0777")
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"UNIX socket permissions for the admin socket. Default allows
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only owner (root), do not change it unless you are sure to whom
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you are exposing the access to.")
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(unix-sock-dir
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(string "/var/run/libvirt")
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"The directory in which sockets will be found/created.")
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(auth-unix-ro
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(string "polkit")
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"Authentication scheme for UNIX read-only sockets. By default
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socket permissions allow anyone to connect")
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(auth-unix-rw
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(string "polkit")
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"Authentication scheme for UNIX read-write sockets. By default
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socket permissions only allow root. If PolicyKit support was compiled
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into libvirt, the default will be to use 'polkit' auth.")
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(auth-tcp
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(string "sasl")
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"Authentication scheme for TCP sockets. If you don't enable SASL,
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then all TCP traffic is cleartext. Don't do this outside of a dev/test
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scenario.")
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(auth-tls
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(string "none")
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"Authentication scheme for TLS sockets. TLS sockets already have
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encryption provided by the TLS layer, and limited authentication is
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done by certificates.
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It is possible to make use of any SASL authentication mechanism as
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well, by using 'sasl' for this option")
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(access-drivers
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(optional-list '())
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"API access control scheme.
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By default an authenticated user is allowed access to all APIs. Access
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drivers can place restrictions on this.")
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(key-file
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(string "")
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"Server key file path. If set to an empty string, then no private key
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is loaded.")
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(cert-file
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(string "")
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"Server key file path. If set to an empty string, then no certificate
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is loaded.")
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(ca-file
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(string "")
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"Server key file path. If set to an empty string, then no CA certificate
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is loaded.")
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(crl-file
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(string "")
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"Certificate revocation list path. If set to an empty string, then no
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CRL is loaded.")
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(tls-no-sanity-cert
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(boolean #f)
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"Disable verification of our own server certificates.
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When libvirtd starts it performs some sanity checks against its own
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certificates.")
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(tls-no-verify-cert
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(boolean #f)
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"Disable verification of client certificates.
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Client certificate verification is the primary authentication mechanism.
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Any client which does not present a certificate signed by the CA
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will be rejected.")
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(tls-allowed-dn-list
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(optional-list '())
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"Whitelist of allowed x509 Distinguished Name.")
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(sasl-allowed-usernames
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(optional-list '())
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"Whitelist of allowed SASL usernames. The format for username
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depends on the SASL authentication mechanism.")
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(tls-priority
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(string "NORMAL")
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"Override the compile time default TLS priority string. The
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default is usually \"NORMAL\" unless overridden at build time.
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Only set this is it is desired for libvirt to deviate from
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the global default settings.")
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(max-clients
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(integer 5000)
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"Maximum number of concurrent client connections to allow
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over all sockets combined.")
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(max-queued-clients
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(integer 1000)
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"Maximum length of queue of connections waiting to be
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accepted by the daemon. Note, that some protocols supporting
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retransmission may obey this so that a later reattempt at
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connection succeeds.")
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(max-anonymous-clients
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(integer 20)
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"Maximum length of queue of accepted but not yet authenticated
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clients. Set this to zero to turn this feature off")
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(min-workers
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(integer 5)
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"Number of workers to start up initially.")
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(max-workers
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(integer 20)
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"Maximum number of worker threads.
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If the number of active clients exceeds @code{min-workers},
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then more threads are spawned, up to max_workers limit.
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Typically you'd want max_workers to equal maximum number
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of clients allowed.")
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(prio-workers
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(integer 5)
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"Number of priority workers. If all workers from above
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pool are stuck, some calls marked as high priority
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(notably domainDestroy) can be executed in this pool.")
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(max-requests
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(integer 20)
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"Total global limit on concurrent RPC calls.")
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(max-client-requests
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(integer 5)
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"Limit on concurrent requests from a single client
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connection. To avoid one client monopolizing the server
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this should be a small fraction of the global max_requests
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and max_workers parameter.")
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(admin-min-workers
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(integer 1)
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"Same as @code{min-workers} but for the admin interface.")
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(admin-max-workers
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(integer 5)
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"Same as @code{max-workers} but for the admin interface.")
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(admin-max-clients
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(integer 5)
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"Same as @code{max-clients} but for the admin interface.")
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(admin-max-queued-clients
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(integer 5)
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"Same as @code{max-queued-clients} but for the admin interface.")
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(admin-max-client-requests
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(integer 5)
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"Same as @code{max-client-requests} but for the admin interface.")
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(log-level
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(integer 3)
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"Logging level. 4 errors, 3 warnings, 2 information, 1 debug.")
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(log-filters
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(string "3:remote 4:event")
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"Logging filters.
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A filter allows to select a different logging level for a given category
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of logs
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The format for a filter is one of:
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@itemize
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@item x:name
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@item x:+name
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@end itemize
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where @code{name} is a string which is matched against the category
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given in the @code{VIR_LOG_INIT()} at the top of each libvirt source
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file, e.g., \"remote\", \"qemu\", or \"util.json\" (the name in the
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filter can be a substring of the full category name, in order
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to match multiple similar categories), the optional \"+\" prefix
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tells libvirt to log stack trace for each message matching
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name, and @code{x} is the minimal level where matching messages should
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be logged:
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@itemize
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@item 1: DEBUG
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@item 2: INFO
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@item 3: WARNING
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@item 4: ERROR
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@end itemize
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Multiple filters can be defined in a single filters statement, they just
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need to be separated by spaces.")
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(log-outputs
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(string "3:stderr")
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"Logging outputs.
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An output is one of the places to save logging information
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The format for an output can be:
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@table @code
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@item x:stderr
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output goes to stderr
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@item x:syslog:name
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use syslog for the output and use the given name as the ident
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@item x:file:file_path
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output to a file, with the given filepath
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@item x:journald
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output to journald logging system
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@end table
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In all case the x prefix is the minimal level, acting as a filter
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@itemize
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@item 1: DEBUG
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@item 2: INFO
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@item 3: WARNING
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@item 4: ERROR
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@end itemize
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Multiple outputs can be defined, they just need to be separated by spaces.")
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(audit-level
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(integer 1)
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"Allows usage of the auditing subsystem to be altered
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@itemize
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@item 0: disable all auditing
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@item 1: enable auditing, only if enabled on host
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@item 2: enable auditing, and exit if disabled on host.
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@end itemize
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")
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(audit-logging
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(boolean #f)
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"Send audit messages via libvirt logging infrastructure.")
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(host-uuid
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(optional-string "")
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"Host UUID. UUID must not have all digits be the same.")
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(host-uuid-source
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(string "smbios")
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"Source to read host UUID.
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@itemize
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@item @code{smbios}: fetch the UUID from @code{dmidecode -s system-uuid}
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@item @code{machine-id}: fetch the UUID from @code{/etc/machine-id}
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@end itemize
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If @code{dmidecode} does not provide a valid UUID a temporary UUID
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will be generated.")
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(keepalive-interval
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(integer 5)
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"A keepalive message is sent to a client after
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@code{keepalive_interval} seconds of inactivity to check if
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the client is still responding. If set to -1, libvirtd will
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never send keepalive requests; however clients can still send
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them and the daemon will send responses.")
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(keepalive-count
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(integer 5)
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"Maximum number of keepalive messages that are allowed to be sent
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to the client without getting any response before the connection is
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considered broken.
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In other words, the connection is automatically
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closed approximately after
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@code{keepalive_interval * (keepalive_count + 1)} seconds since the last
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message received from the client. When @code{keepalive-count} is
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set to 0, connections will be automatically closed after
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@code{keepalive-interval} seconds of inactivity without sending any
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keepalive messages.")
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(admin-keepalive-interval
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(integer 5)
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"Same as above but for admin interface.")
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(admin-keepalive-count
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(integer 5)
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"Same as above but for admin interface.")
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(ovs-timeout
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(integer 5)
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"Timeout for Open vSwitch calls.
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The @code{ovs-vsctl} utility is used for the configuration and
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its timeout option is set by default to 5 seconds to avoid
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potential infinite waits blocking libvirt."))
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(define* (libvirt-conf-file config)
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"Return a libvirtd config file."
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(plain-file "libvirtd.conf"
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(with-output-to-string
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(lambda ()
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(serialize-configuration config libvirt-configuration-fields)))))
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(define %libvirt-accounts
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(list (user-group (name "libvirt") (system? #t))))
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(define (%libvirt-activation config)
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(let ((sock-dir (libvirt-configuration-unix-sock-dir config)))
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#~(begin
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(use-modules (guix build utils))
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(mkdir-p #$sock-dir))))
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(define (libvirt-shepherd-service config)
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(let* ((config-file (libvirt-conf-file config))
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(libvirt (libvirt-configuration-libvirt config)))
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(list (shepherd-service
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(documentation "Run the libvirt daemon.")
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(provision '(libvirtd))
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(start #~(make-forkexec-constructor
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(list (string-append #$libvirt "/sbin/libvirtd")
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"-f" #$config-file)))
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(stop #~(make-kill-destructor))))))
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(define libvirt-service-type
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(service-type (name 'libvirt)
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(extensions
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(list
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(service-extension polkit-service-type
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(compose list libvirt-configuration-libvirt))
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(service-extension profile-service-type
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(lambda (config)
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(list
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(libvirt-configuration-libvirt config)
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qemu)))
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(service-extension activation-service-type
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%libvirt-activation)
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(service-extension shepherd-root-service-type
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libvirt-shepherd-service)
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(service-extension account-service-type
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(const %libvirt-accounts))))
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(default-value (libvirt-configuration))))
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(define-record-type* <virtlog-configuration>
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virtlog-configuration make-virtlog-configuration
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virtlog-configuration?
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(libvirt virtlog-configuration-libvirt
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(default libvirt))
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(log-level virtlog-configuration-log-level
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(default 3))
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(log-filters virtlog-configuration-log-filters
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(default "3:remote 4:event"))
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(log-outputs virtlog-configuration-log-outputs
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(default "3:syslog:virtlogd"))
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(max-clients virtlog-configuration-max-clients
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(default 1024))
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(max-size virtlog-configuration-max-size
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(default 2097152)) ;; 2MB
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(max-backups virtlog-configuration-max-backups
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(default 3)))
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(define* (virtlogd-conf-file config)
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"Return a virtlogd config file."
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(plain-file "virtlogd.conf"
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(string-append
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"log_level = " (number->string (virtlog-configuration-log-level config)) "\n"
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"log_filters = \"" (virtlog-configuration-log-filters config) "\"\n"
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"log_outputs = \"" (virtlog-configuration-log-outputs config) "\"\n"
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"max_clients = " (number->string (virtlog-configuration-max-clients config)) "\n"
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"max_size = " (number->string (virtlog-configuration-max-size config)) "\n"
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"max_backups = " (number->string (virtlog-configuration-max-backups config)) "\n")))
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(define (virtlogd-shepherd-service config)
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(let* ((config-file (virtlogd-conf-file config))
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(libvirt (virtlog-configuration-libvirt config)))
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(list (shepherd-service
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(documentation "Run the virtlog daemon.")
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(provision '(virtlogd))
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(start #~(make-forkexec-constructor
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(list (string-append #$libvirt "/sbin/virtlogd")
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"-f" #$config-file)))
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(stop #~(make-kill-destructor))))))
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(define virtlog-service-type
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(service-type (name 'virtlogd)
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(extensions
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(list
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(service-extension shepherd-root-service-type
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virtlogd-shepherd-service)))
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(default-value (virtlog-configuration))))
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(define (generate-libvirt-documentation)
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(generate-documentation
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`((libvirt-configuration ,libvirt-configuration-fields))
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'libvirt-configuration))
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;;;
|
||
;;; Transparent QEMU emulation via binfmt_misc.
|
||
;;;
|
||
|
||
;; Platforms that QEMU can emulate.
|
||
(define-record-type <qemu-platform>
|
||
(qemu-platform name family magic mask)
|
||
qemu-platform?
|
||
(name qemu-platform-name) ;string
|
||
(family qemu-platform-family) ;string
|
||
(magic qemu-platform-magic) ;bytevector
|
||
(mask qemu-platform-mask)) ;bytevector
|
||
|
||
(define-syntax bv
|
||
(lambda (s)
|
||
"Expand the given string into a bytevector."
|
||
(syntax-case s ()
|
||
((_ str)
|
||
(string? (syntax->datum #'str))
|
||
(let ((bv (u8-list->bytevector
|
||
(map char->integer
|
||
(string->list (syntax->datum #'str))))))
|
||
bv)))))
|
||
|
||
;;; The platform descriptions below are taken from
|
||
;;; 'scripts/qemu-binfmt-conf.sh' in QEMU.
|
||
|
||
(define %i386
|
||
(qemu-platform "i386" "i386"
|
||
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %i486
|
||
(qemu-platform "i486" "i386"
|
||
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %alpha
|
||
(qemu-platform "alpha" "alpha"
|
||
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90")
|
||
(bv "\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %arm
|
||
(qemu-platform "arm" "arm"
|
||
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %armeb
|
||
(qemu-platform "armeb" "arm"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %sparc
|
||
(qemu-platform "sparc" "sparc"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %sparc32plus
|
||
(qemu-platform "sparc32plus" "sparc"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %ppc
|
||
(qemu-platform "ppc" "ppc"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %ppc64
|
||
(qemu-platform "ppc64" "ppc"
|
||
(bv "\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %ppc64le
|
||
(qemu-platform "ppc64le" "ppcle"
|
||
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00")))
|
||
|
||
(define %m68k
|
||
(qemu-platform "m68k" "m68k"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
;; XXX: We could use the other endianness on a MIPS host.
|
||
(define %mips
|
||
(qemu-platform "mips" "mips"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %mipsel
|
||
(qemu-platform "mipsel" "mips"
|
||
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %mipsn32
|
||
(qemu-platform "mipsn32" "mips"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %mipsn32el
|
||
(qemu-platform "mipsn32el" "mips"
|
||
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %mips64
|
||
(qemu-platform "mips64" "mips"
|
||
(bv "\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %mips64el
|
||
(qemu-platform "mips64el" "mips"
|
||
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %sh4
|
||
(qemu-platform "sh4" "sh4"
|
||
(bv "\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %sh4eb
|
||
(qemu-platform "sh4eb" "sh4"
|
||
(bv "\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %s390x
|
||
(qemu-platform "s390x" "s390x"
|
||
(bv "\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %aarch64
|
||
(qemu-platform "aarch64" "arm"
|
||
(bv "\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff")))
|
||
|
||
(define %hppa
|
||
(qemu-platform "hppa" "hppa"
|
||
(bv "\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f")
|
||
(bv "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff")))
|
||
|
||
(define %qemu-platforms
|
||
(list %i386 %i486 %alpha %arm %sparc32plus %ppc %ppc64 %ppc64le %m68k
|
||
%mips %mipsel %mipsn32 %mipsn32el %mips64 %mips64el
|
||
%sh4 %sh4eb %s390x %aarch64 %hppa))
|
||
|
||
(define (lookup-qemu-platforms . names)
|
||
"Return the list of QEMU platforms that match NAMES--a list of names such as
|
||
\"arm\", \"hppa\", etc."
|
||
(filter (lambda (platform)
|
||
(member (qemu-platform-name platform) names))
|
||
%qemu-platforms))
|
||
|
||
(define-record-type* <qemu-binfmt-configuration>
|
||
qemu-binfmt-configuration make-qemu-binfmt-configuration
|
||
qemu-binfmt-configuration?
|
||
(qemu qemu-binfmt-configuration-qemu
|
||
(default qemu))
|
||
(platforms qemu-binfmt-configuration-platforms
|
||
(default '())) ;safest default
|
||
(guix-support? qemu-binfmt-configuration-guix-support?
|
||
(default #f)))
|
||
|
||
(define (qemu-platform->binfmt qemu platform)
|
||
"Return a gexp that evaluates to a binfmt string for PLATFORM, using the
|
||
given QEMU package."
|
||
(define (bytevector->binfmt-string bv)
|
||
;; Return a binfmt-friendly string representing BV. Hex-encode every
|
||
;; character, in particular because the doc notes "that you must escape
|
||
;; any NUL bytes; parsing halts at the first one".
|
||
(string-concatenate
|
||
(map (lambda (n)
|
||
(string-append "\\x"
|
||
(string-pad (number->string n 16) 2 #\0)))
|
||
(bytevector->u8-list bv))))
|
||
|
||
(match platform
|
||
(($ <qemu-platform> name family magic mask)
|
||
;; See 'Documentation/binfmt_misc.txt' in the kernel.
|
||
#~(string-append ":qemu-" #$name ":M::"
|
||
#$(bytevector->binfmt-string magic)
|
||
":" #$(bytevector->binfmt-string mask)
|
||
":" #$(file-append qemu "/bin/qemu-" name)
|
||
":" ;FLAGS go here
|
||
))))
|
||
|
||
(define %binfmt-mount-point
|
||
(file-system-mount-point %binary-format-file-system))
|
||
|
||
(define %binfmt-register-file
|
||
(string-append %binfmt-mount-point "/register"))
|
||
|
||
(define qemu-binfmt-shepherd-services
|
||
(match-lambda
|
||
(($ <qemu-binfmt-configuration> qemu platforms)
|
||
(list (shepherd-service
|
||
(provision '(qemu-binfmt))
|
||
(documentation "Install binfmt_misc handlers for QEMU.")
|
||
(requirement '(file-system-/proc/sys/fs/binfmt_misc))
|
||
(start #~(lambda ()
|
||
;; Register the handlers for all of PLATFORMS.
|
||
(for-each (lambda (str)
|
||
(call-with-output-file
|
||
#$%binfmt-register-file
|
||
(lambda (port)
|
||
(display str port))))
|
||
(list
|
||
#$@(map (cut qemu-platform->binfmt qemu
|
||
<>)
|
||
platforms)))
|
||
#t))
|
||
(stop #~(lambda (_)
|
||
;; Unregister the handlers.
|
||
(for-each (lambda (name)
|
||
(let ((file (string-append
|
||
#$%binfmt-mount-point
|
||
"/qemu-" name)))
|
||
(call-with-output-file file
|
||
(lambda (port)
|
||
(display "-1" port)))))
|
||
'#$(map qemu-platform-name platforms))
|
||
#f)))))))
|
||
|
||
(define qemu-binfmt-guix-chroot
|
||
(match-lambda
|
||
;; Add QEMU and its dependencies to the guix-daemon chroot so that our
|
||
;; binfmt_misc handlers work in the chroot (otherwise 'execve' would fail
|
||
;; with ENOENT.)
|
||
;;
|
||
;; The 'F' flag of binfmt_misc is meant to address this problem by loading
|
||
;; the interpreter upfront rather than lazily, but apparently that is
|
||
;; insufficient (perhaps it loads the 'qemu-ARCH' binary upfront but looks
|
||
;; up its dependencies lazily?).
|
||
(($ <qemu-binfmt-configuration> qemu platforms guix?)
|
||
(if guix? (list qemu) '()))))
|
||
|
||
(define qemu-binfmt-service-type
|
||
;; TODO: Make a separate binfmt_misc service out of this?
|
||
(service-type (name 'qemu-binfmt)
|
||
(extensions
|
||
(list (service-extension file-system-service-type
|
||
(const
|
||
(list %binary-format-file-system)))
|
||
(service-extension shepherd-root-service-type
|
||
qemu-binfmt-shepherd-services)
|
||
(service-extension guix-service-type
|
||
qemu-binfmt-guix-chroot)))
|
||
(default-value (qemu-binfmt-configuration))
|
||
(description
|
||
"This service supports transparent emulation of binaries
|
||
compiled for other architectures using QEMU and the @code{binfmt_misc}
|
||
functionality of the kernel Linux.")))
|