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;;; Consfigurator -- Lisp declarative configuration management system
;;; Copyright (C) 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.connection.fork)
(named-readtables:in-readtable :consfigurator)
(defclass fork-connection (local-connection) ())
(defgeneric post-fork (connection)
(:documentation
"Code to execute after forking/reinvoking but before calling CONTINUE-DEPLOY*.
Must not start up any threads."))
(defmethod continue-connection ((connection fork-connection) remaining)
(multiple-value-bind (out err exit)
(eval-in-grandchild `(post-fork ,connection)
`(continue-deploy* ,connection ',remaining))
(when-let ((lines (lines out)))
(inform t lines))
(exit-code-to-retval
exit
:on-failure (failed-change
"~&Fork connection child failed; stderr was ~%~%~A" err))))
;;;; Dumping and then immediately reinvoking Lisp
(defclass init-hooks-connection (fork-connection) ()
(:documentation "On SBCL, call POST-FORK using SB-EXT:*INIT-HOOKS*.
The primary purpose of this connection type is to obtain a truly
single-threaded context for the execution of POST-FORK."))
#+(and sbcl sb-thread)
(eval-when (:compile-toplevel :load-toplevel :execute)
;; UIOP:VERSION< cannot handle Debian-patched SBCL version numbers, so we
;; split it up ourselves.
(destructuring-bind (major minor patch . rest)
(mapcar (lambda (s) (parse-integer s :junk-allowed t))
(split-string (lisp-implementation-version) :separator '(#\.)))
(declare (ignore rest))
(unless (or (> major 2)
(and (= major 2)
(or (> minor 1) (and (= minor 1) (> patch 7)))))
(pushnew 'older-sbcl *features*))))
#+sbcl
(defmethod continue-connection ((connection init-hooks-connection) remaining)
(multiple-value-bind (out err exit)
(eval-in-reinvoked
`(push
(lambda ()
(handler-bind
((serious-condition
(lambda (c)
(trivial-backtrace:print-backtrace c :output *error-output*)
(uiop:quit 1))))
;; Handle the finaliser thread in older SBCL, before the change in
;; 2.1.8 to call *INIT-HOOKS* before starting system threads.
#+consfigurator.connection.fork::older-sbcl
(sb-int:with-system-mutex (sb-thread::*make-thread-lock*)
(sb-impl::finalizer-thread-stop))
(post-fork ,connection)
#+consfigurator.connection.fork::older-sbcl
(sb-impl::finalizer-thread-start)))
sb-ext:*init-hooks*)
`(continue-deploy* ,connection ',remaining))
(when-let ((lines (lines out)))
(inform t lines))
(exit-code-to-retval
exit
:on-failure (failed-change
"~&Reinvoked Lisp image failed; stderr was ~%~%~A" err))))
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