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;;; Consfigurator -- Lisp declarative configuration management system
;;; Copyright (C) 2018, 2021 Sean Whitton <spwhitton@spwhitton.name>
;;; This file is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3, or (at your option)
;;; any later version.
;;; This file is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :consfigurator.property.libvirt)
(named-readtables:in-readtable :consfigurator)
(defproplist installed :posix ()
"Install basic libvirt components."
(:desc "libvirt installed")
(os:etypecase
(debianlike (apt:installed "libvirt-clients" "virtinst"
"libvirt-daemon" "libvirt-daemon-system"))))
(defprop %default-network-started :posix ()
(:desc "libvirt's default network started")
(:check
(member "default" (mapcar #'car (virsh-get-columns "net-list"))
:test #'string=))
(:apply
(mrun "virsh" "net-start" "default")))
(defprop %default-network-autostarted :posix ()
(:desc "libvirt's default network marked for autostart")
(:check
(remote-exists-p "/etc/libvirt/qemu/networks/autostart/default.xml"))
(:apply
(mrun "virsh" "net-autostart" "default")))
(defproplist default-network-started :posix ()
"Ensure that the default libvirt network is started."
(:desc "libvirt's default network started")
(installed)
(%default-network-started))
(defproplist default-network-autostarted :posix ()
"Ensure that the default libvirt network is set to autostart, and start it.
On Debian, it is not started by default after installation of libvirt."
(:desc "libvirt's default network started & marked for autostart")
(installed)
(%default-network-autostarted)
(%default-network-started))
(defmethod os-variant ((os os:debian-stable))
(switch ((os:debian-suite os) :test #'string=)
("jessie" "debian8")
("stretch" "debian9")
(t nil)))
(defmethod os-variant ((os os:debian-testing))
"debiantesting")
(defmethod os-variant ((os os:debian-unstable))
"debiantesting")
(defmethod os-variant (os))
(defprop defined :posix (host &rest arguments)
"Define a libvirt domain for HOST by providing ARGUMENTS to virt-install(1).
With the current implementation, if ARGUMENTS changes, virt-install(1) will
not be run again. You will need to either unapply and reapply this property,
or use virt-xml(1) to perform a modification.
Unapplying this property when the domain is running will use the 'undefine'
subcommand of virsh(1) to convert the running domain into a transient domain."
(:desc "libvirt domain XML defined")
(:check (declare (ignore arguments))
(remote-exists-p (merge-pathnames (strcat (get-hostname host) ".xml")
"/etc/libvirt/qemu/")))
(:apply
(with-remote-temporary-file (file)
(mrun
(format
nil
"virt-install --print-xml -n ~A~:[~; --os-variant=~:*~A~]~{ ~A~} >~S"
(get-hostname host) (os-variant host)
(mapcar #'escape-sh-token arguments) file))
(mrun "virsh" "define" file)))
(:unapply
(declare (ignore arguments))
(mrun "virsh" "undefine" (get-hostname host))))
(defprop started :posix (host)
"Ensure the libvirt domain for the host designated by HOST is started.
(I.e., if HOST is a string, ensure the domain named HOST is started; if HOST
is a HOST value, start the libvirt domain whose name is HOST's hostname.)"
(:desc #?"libvirt domain ${(get-hostname host)} started")
(:check (host-domain-started-p host))
(:apply (mrun "virsh" "start" (get-hostname host))))
(defmacro when-started (host &body propapps)
"Apply PROPAPPS only when the libvirt domain for the host designated by HOST
is already running.
Useful to conditionalise a DEPLOYS property to do nothing unless the VM is
already running, for a VM which is not always booted, e.g. on a laptop."
`(when-started*
',host
,(if (cdr propapps) `(eseqprops ,@propapps) (car propapps))))
(define-function-property-combinator when-started* (host propapp)
(macrolet ((check-started (form)
`(if (host-domain-started-p host)
,form :no-change)))
(:retprop :type (propapptype propapp)
:desc (get (car propapp) 'desc)
:hostattrs (get (car propapp) 'hostattrs)
:apply (lambda (&rest ignore)
(declare (ignore ignore))
(check-started (propappapply propapp)))
:unapply (lambda (&rest ignore)
(declare (ignore ignore))
(check-started (propappunapply propapp)))
:args (cdr propapp))))
(defun virsh-get-columns (&rest arguments)
"Run a virsh command that is expected to yield tabular output, with the given
list of ARGUMENTS, and return the rows."
(mapcar (lambda (row)
(delete "" (split-string row) :test #'string=))
(cddr (nbutlast (runlines "virsh" arguments)))))
(defun host-domain-started-p (host)
;; The "State" column in the output of 'virsh list' is to be ignored here;
;; 'virsh start' will do nothing if the VM appears at all in the output of
;; 'virsh list'.
(member (get-hostname host) (mapcar #'cadr (virsh-get-columns "list"))
:test #'string=))
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