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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019, 2020 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 (guix utils)
#:use-module (guix build utils)
#:use-module (guix i18n)
#:use-module (srfi srfi-34)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 regex)
#:use-module (ice-9 format)
#:use-module (ice-9 textual-ports)
#:export (read-lines
read-all
nearest-exact-integer
read-percentage
run-shell-command
syslog-port
syslog))
(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-shell-command command #:key locale)
"Run COMMAND, a string, with Bash, and in the given LOCALE. Return true if
COMMAND exited successfully, #f otherwise."
(define (pause)
(format #t (G_ "Press Enter to continue.~%"))
(read-line (current-input-port)))
(call-with-temporary-output-file
(lambda (file port)
(when locale
(let ((supported? (false-if-exception
(setlocale LC_ALL locale))))
;; If LOCALE is not supported, then set LANGUAGE, which might at
;; least give us translated messages.
(if supported?
(format port "export LC_ALL=\"~a\"~%" locale)
(format port "export LANGUAGE=\"~a\"~%"
(string-take locale
(string-index locale #\_))))))
(format port "exec ~a~%" command)
(close port)
(guard (c ((invoke-error? c)
(newline)
(format (current-error-port)
(G_ "Command failed with exit code ~a.~%")
(invoke-error-exit-status c))
(syslog "command ~s failed with exit code ~a"
command (invoke-error-exit-status c))
(pause)
#f))
(syslog "running command ~s~%" command)
(invoke "bash" "--init-file" file)
(syslog "command ~s succeeded~%" command)
(newline)
(pause)
#t))))
;;;
;;; Logging.
;;;
(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-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 ...))))))
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