me
/
guix
Archived
1
0
Fork 0
This repository has been archived on 2024-08-07. You can view files and clone it, but cannot push or open issues/pull-requests.
guix/gnu/installer/utils.scm

397 lines
13 KiB
Scheme
Raw Blame History

This file contains invisible Unicode characters!

This file contains invisible Unicode characters that may be processed differently from what appears below. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to reveal hidden characters.

;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019, 2020, 2022 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu installer utils)
#:use-module (gnu services herd)
#:use-module (guix utils)
#:use-module ((guix build syscalls) #:select (openpty login-tty))
#:use-module (guix build utils)
#:use-module (guix i18n)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (ice-9 control)
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (ice-9 format)
#:use-module (ice-9 textual-ports)
#:export (<secret>
secret?
make-secret
secret-content
read-lines
read-all
nearest-exact-integer
read-percentage
run-external-command-with-handler
run-external-command-with-handler/tty
run-external-command-with-line-hooks
run-command
run-command-in-installer
syslog-port
%syslog-line-hook
installer-log-port
%installer-log-line-hook
%default-installer-line-hooks
installer-log-line
call-with-time
let/time
with-server-socket
current-server-socket
current-clients
send-to-clients
with-silent-shepherd))
(define-record-type <secret>
(make-secret content)
secret?
(content secret-content))
(set-record-type-printer!
<secret>
(lambda (secret port)
(format port "<secret>")))
(define* (read-lines #:optional (port (current-input-port)))
"Read lines from PORT and return them as a list."
(let loop ((line (read-line port))
(lines '()))
(if (eof-object? line)
(reverse lines)
(loop (read-line port)
(cons line lines)))))
(define (read-all file)
"Return the content of the given FILE as a string."
(call-with-input-file file
get-string-all))
(define (nearest-exact-integer x)
"Given a real number X, return the nearest exact integer, with ties going to
the nearest exact even integer."
(inexact->exact (round x)))
(define (read-percentage percentage)
"Read PERCENTAGE string and return the corresponding percentage as a
number. If no percentage is found, return #f"
(let ((result (string-match "^([0-9]+)%$" percentage)))
(and result
(string->number (match:substring result 1)))))
(define* (run-external-command-with-handler handler command)
"Run command specified by the list COMMAND in a child with output handler
HANDLER. HANDLER is a procedure taking an input port, to which the command
will write its standard output and error. Returns the integer status value of
the child process as returned by waitpid."
(match-let (((input . output) (pipe)))
;; Hack to work around Guile bug 52835
(define dup-output (duplicate-port output "w"))
;; Void pipe, but holds the pid for close-pipe.
(define dummy-pipe
(with-input-from-file "/dev/null"
(lambda ()
(with-output-to-port output
(lambda ()
(with-error-to-port dup-output
(lambda ()
(apply open-pipe* (cons "" command)))))))))
(close-port output)
(close-port dup-output)
(handler input)
(close-port input)
(close-pipe dummy-pipe)))
(define (run-external-command-with-handler/tty handler command)
"Run command specified by the list COMMAND in a child operating in a
pseudoterminal with output handler HANDLER. HANDLER is a procedure taking an
input port, to which the command will write its standard output and error.
Returns the integer status value of the child process as returned by waitpid."
(define-values (controller inferior)
(openpty))
(match (primitive-fork)
(0
(catch #t
(lambda ()
(close-fdes controller)
(login-tty inferior)
(apply execlp (car command) command))
(lambda _
(primitive-exit 127))))
(pid
(close-fdes inferior)
(let* ((port (fdopen controller "r0"))
(result (false-if-exception
(handler port))))
(close-port port)
(cdr (waitpid pid))))))
(define* (run-external-command-with-line-hooks line-hooks command
#:key (tty? #false))
"Run command specified by the list COMMAND in a child, processing each
output line with the procedures in LINE-HOOKS. If TTY is set to #true, the
COMMAND will be run in a pseudoterminal. Returns the integer status value of
the child process as returned by waitpid."
(define (handler input)
(and
;; Lines for progress bars etc. end in \r; treat is as a line ending so
;; those lines are printed right away.
(and=> (read-delimited "\r\n" input 'concat)
(lambda (line)
(if (eof-object? line)
#f
(begin (for-each (lambda (f) (f line))
(append line-hooks
%default-installer-line-hooks))
#t))))
(handler input)))
(if tty?
(run-external-command-with-handler/tty handler command)
(run-external-command-with-handler handler command)))
(define* (run-command command #:key (tty? #f))
"Run COMMAND, a list of strings. Return true if COMMAND exited
successfully, #f otherwise. If TTY is set to #true, the COMMAND will be run
in a pseudoterminal."
(define (pause)
(format #t (G_ "Press Enter to continue.~%"))
(send-to-clients '(pause))
(match (select (cons (current-input-port) (current-clients))
'() '())
(((port _ ...) _ _)
(read-line port))))
(installer-log-line "running command ~s" command)
(define result (run-external-command-with-line-hooks
(list display) command
#:tty? tty?))
(define exit-val (status:exit-val result))
(define term-sig (status:term-sig result))
(define stop-sig (status:stop-sig result))
(define succeeded?
(cond
((and exit-val (not (zero? exit-val)))
(installer-log-line "command ~s exited with value ~a"
command exit-val)
(format #t (G_ "Command ~s exited with value ~a")
command exit-val)
#f)
(term-sig
(installer-log-line "command ~s killed by signal ~a"
command term-sig)
(format #t (G_ "Command ~s killed by signal ~a")
command term-sig)
#f)
(stop-sig
(installer-log-line "command ~s stopped by signal ~a"
command stop-sig)
(format #t (G_ "Command ~s stopped by signal ~a")
command stop-sig)
#f)
(else
(installer-log-line "command ~s succeeded" command)
(format #t (G_ "Command ~s succeeded") command)
#t)))
(newline)
(pause)
succeeded?)
(define run-command-in-installer
(make-parameter
(lambda (. args)
(raise
(condition
(&serious)
(&message (message "run-command-in-installer not set")))))))
;;;
;;; Logging.
;;;
(define (call-with-time thunk kont)
"Call THUNK and pass KONT the elapsed time followed by THUNK's return
values."
(let* ((start (current-time time-monotonic))
(result (call-with-values thunk list))
(end (current-time time-monotonic)))
(apply kont (time-difference end start) result)))
(define-syntax-rule (let/time ((time result exp)) body ...)
(call-with-time (lambda () exp) (lambda (time result) body ...)))
(define (open-syslog-port)
"Return an open port (a socket) to /dev/log or #f if that wasn't possible."
(let ((sock (socket AF_UNIX SOCK_DGRAM 0)))
(catch 'system-error
(lambda ()
(connect sock AF_UNIX "/dev/log")
(setvbuf sock 'line)
sock)
(lambda args
(close-port sock)
#f))))
(define syslog-port
(let ((port #f))
(lambda ()
"Return an output port to syslog."
(unless port
(set! port (open-syslog-port)))
(or port (%make-void-port "w")))))
(define (%syslog-line-hook line)
(let ((line (if (string-suffix? "\r" line)
(string-append (string-drop-right line 1) "\n")
line)))
(format (syslog-port) "installer[~d]: ~a" (getpid) line)))
(define-syntax syslog
(lambda (s)
"Like 'format', but write to syslog."
(syntax-case s ()
((_ fmt args ...)
(string? (syntax->datum #'fmt))
(with-syntax ((fmt (string-append "installer[~d]: "
(syntax->datum #'fmt))))
#'(format (syslog-port) fmt (getpid) args ...))))))
(define (open-new-log-port)
(define now (localtime (time-second (current-time))))
(define filename
(format #f "/tmp/installer.~a.log"
(strftime "%F.%T" now)))
(open filename (logior O_RDWR
O_CREAT)))
(define installer-log-port
(let ((port #f))
(lambda ()
"Return an input and output port to the installer log."
(unless port
(set! port (open-new-log-port)))
port)))
(define (%installer-log-line-hook line)
(display line (installer-log-port)))
(define %default-installer-line-hooks
(list %syslog-line-hook
%installer-log-line-hook))
(define-syntax installer-log-line
(lambda (s)
"Like 'format', but uses the default line hooks, and only formats one line."
(syntax-case s ()
((_ fmt args ...)
(string? (syntax->datum #'fmt))
(with-syntax ((fmt (string-append (syntax->datum #'fmt) "\n")))
#'(let ((formatted (format #f fmt args ...)))
(for-each (lambda (f) (f formatted))
%default-installer-line-hooks)))))))
;;;
;;; Client protocol.
;;;
(define %client-socket-file
;; Unix-domain socket where the installer accepts connections.
"/var/guix/installer-socket")
(define current-server-socket
;; Socket on which the installer is currently accepting connections, or #f.
(make-parameter #f))
(define current-clients
;; List of currently connected clients.
(make-parameter '()))
(define* (open-server-socket
#:optional (socket-file %client-socket-file))
"Open SOCKET-FILE as a Unix-domain socket to accept incoming connections and
return it."
(mkdir-p (dirname socket-file))
(when (file-exists? socket-file)
(delete-file socket-file))
(let ((sock (socket AF_UNIX SOCK_STREAM 0)))
(bind sock AF_UNIX socket-file)
(listen sock 0)
sock))
(define (call-with-server-socket thunk)
(if (current-server-socket)
(thunk)
(let ((socket (open-server-socket)))
(dynamic-wind
(const #t)
(lambda ()
(parameterize ((current-server-socket socket))
(thunk)))
(lambda ()
(close-port socket))))))
(define-syntax-rule (with-server-socket exp ...)
"Evaluate EXP with 'current-server-socket' parameterized to a currently
accepting socket."
(call-with-server-socket (lambda () exp ...)))
(define* (send-to-clients exp)
"Send EXP to all the current clients."
(define remainder
(fold (lambda (client remainder)
(catch 'system-error
(lambda ()
(write exp client)
(newline client)
(force-output client)
(cons client remainder))
(lambda args
;; We might get EPIPE if the client disconnects; when that
;; happens, remove CLIENT from the set of available clients.
(let ((errno (system-error-errno args)))
(if (memv errno (list EPIPE ECONNRESET ECONNABORTED))
(begin
(installer-log-line
"removing client ~s due to ~s while replying"
(fileno client) (strerror errno))
(false-if-exception (close-port client))
remainder)
(cons client remainder))))))
'()
(current-clients)))
(current-clients (reverse remainder))
exp)
(define-syntax-rule (with-silent-shepherd exp ...)
"Evaluate EXP while discarding shepherd messages."
(parameterize ((shepherd-message-port
(%make-void-port "w")))
exp ...))