591af24ade
Fixes <https://issues.guix.gnu.org/59922>. Previously progress bars and related things would be buffered by 'run-external-command-with-line-hooks' until \n is read. * gnu/installer/utils.scm (run-external-command-with-line-hooks): Use 'read-delimited' rather than 'get-line'. Pass 'concat as the last argument. (%display-line-hook): Remove. (run-command): Use 'display' instead of '%display-line-hook'. (%syslog-line-hook): Add "\n" when LINE doesn't end in \n. (%installer-log-line-hook): Do not add an extra newline. (installer-log-line): Add an extra newline.
397 lines
13 KiB
Scheme
397 lines
13 KiB
Scheme
;;; 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 ...))
|