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authorLudovic Courtès <ludo@gnu.org>2020-02-18 18:23:19 +0100
committerLudovic Courtès <ludo@gnu.org>2020-02-22 00:45:42 +0100
commit2cf65e1d543407bc7db43e7c7d39a215907efebc (patch)
tree66d36459d0f6392f5ee457bc8b099a48e8341758
parentb6ec284fe8b67bba4b17aab98641a91a17658133 (diff)
installer: Add 'syslog' macro to write to syslog.
* gnu/installer/utils.scm (open-syslog-port, syslog-port): New procedures. (syslog): New macro.
-rw-r--r--gnu/installer/utils.scm43
1 files changed, 41 insertions, 2 deletions
diff --git a/gnu/installer/utils.scm b/gnu/installer/utils.scm
index ddb96bc338..a5f390e7a2 100644
--- a/gnu/installer/utils.scm
+++ b/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 ...))))))