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installer: Add 'syslog' macro to write to syslog.

* gnu/installer/utils.scm (open-syslog-port, syslog-port): New
procedures.
(syslog): New macro.
guile-daemon
Ludovic Courtès 2 years ago
parent
commit
2cf65e1d54
No known key found for this signature in database GPG Key ID: 90B11993D9AEBB5
  1. 43
      gnu/installer/utils.scm

43
gnu/installer/utils.scm

@ -1,6 +1,6 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -24,12 +24,16 @@
#: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))
run-shell-command
syslog-port
syslog))
(define* (read-lines #:optional (port (current-input-port)))
"Read lines from PORT and return them as a list."
@ -91,3 +95,38 @@ COMMAND exited successfully, #f otherwise."
(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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