178 lines
6.8 KiB
Scheme
178 lines
6.8 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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;;; Copyright © 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of thye GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gnu services admin)
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#:use-module (gnu packages admin)
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#:use-module (gnu packages base)
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#:use-module (gnu services)
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#:use-module (gnu services mcron)
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#:use-module (gnu services shepherd)
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#:use-module (guix gexp)
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#:use-module (guix packages)
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#:use-module (guix records)
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#:use-module (srfi srfi-1)
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#:use-module (ice-9 vlist)
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#:export (%default-rotations
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%rotated-files
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log-rotation
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log-rotation?
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log-rotation-frequency
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log-rotation-files
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log-rotation-options
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log-rotation-post-rotate
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rottlog-configuration
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rottlog-configuration?
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rottlog-service
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rottlog-service-type))
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;;; Commentary:
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;;;
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;;; This module implements configuration of rottlog by writing
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;;; /etc/rottlog/{rc,hourly|daily|weekly}. Example usage
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;;;
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;;; (mcron-service)
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;;; (service rottlog-service-type)
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;;;
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;;; Code:
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(define-record-type* <log-rotation> log-rotation make-log-rotation
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log-rotation?
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(files log-rotation-files) ;list of strings
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(frequency log-rotation-frequency ;symbol
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(default 'weekly))
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(post-rotate log-rotation-post-rotate ;#f | gexp
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(default #f))
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(options log-rotation-options ;list of strings
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(default '())))
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(define %rotated-files
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;; Syslog files subject to rotation.
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'("/var/log/messages" "/var/log/secure" "/var/log/debug"
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"/var/log/maillog"))
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(define %default-rotations
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(list (log-rotation ;syslog files
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(files %rotated-files)
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;; Restart syslogd after rotation.
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(options '("sharedscripts"))
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(post-rotate #~(let ((pid (call-with-input-file "/var/run/syslog.pid"
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read)))
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(kill pid SIGHUP))))
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(log-rotation
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(files '("/var/log/guix-daemon.log")))))
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(define (log-rotation->config rotation)
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"Return a string-valued gexp representing the rottlog configuration snippet
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for ROTATION."
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(define post-rotate
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(let ((post (log-rotation-post-rotate rotation)))
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(and post
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(program-file "rottlog-post-rotate.scm" post))))
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#~(let ((post #$post-rotate))
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(string-append (string-join '#$(log-rotation-files rotation) ",")
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" {"
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#$(string-join (log-rotation-options rotation)
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"\n " 'prefix)
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(if post
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(string-append "\n postrotate\n " post
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"\n endscript\n")
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"")
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"\n}\n")))
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(define (log-rotations->/etc-entries rotations)
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"Return the list of /etc entries for ROTATIONS, a list of <log-rotation>."
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(define (frequency-file frequency rotations)
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(computed-file (string-append "rottlog." (symbol->string frequency))
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#~(call-with-output-file #$output
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(lambda (port)
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(for-each (lambda (str)
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(display str port))
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(list #$@(map log-rotation->config
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rotations)))))))
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(let* ((frequencies (delete-duplicates
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(map log-rotation-frequency rotations)))
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(table (fold (lambda (rotation table)
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(vhash-consq (log-rotation-frequency rotation)
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rotation table))
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vlist-null
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rotations)))
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(map (lambda (frequency)
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`(,(symbol->string frequency)
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,(frequency-file frequency
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(vhash-foldq* cons '() frequency table))))
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frequencies)))
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(define (default-jobs rottlog)
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(list #~(job '(next-hour '(0)) ;midnight
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#$(file-append rottlog "/sbin/rottlog"))
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#~(job '(next-hour '(12)) ;noon
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#$(file-append rottlog "/sbin/rottlog"))))
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(define-record-type* <rottlog-configuration>
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rottlog-configuration make-rottlog-configuration
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rottlog-configuration?
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(rottlog rottlog-rottlog ;package
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(default rottlog))
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(rc-file rottlog-rc-file ;file-like
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(default (file-append rottlog "/etc/rc")))
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(rotations rottlog-rotations ;list of <log-rotation>
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(default %default-rotations))
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(jobs rottlog-jobs ;list of <mcron-job>
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(default #f)))
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(define (rottlog-etc config)
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`(("rottlog"
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,(file-union "rottlog"
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(cons `("rc" ,(rottlog-rc-file config))
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(log-rotations->/etc-entries
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(rottlog-rotations config)))))))
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(define (rottlog-jobs-or-default config)
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(or (rottlog-jobs config)
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(default-jobs (rottlog-rottlog config))))
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(define rottlog-service-type
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(service-type
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(name 'rottlog)
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(description
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"Periodically rotate log files using GNU@tie{}Rottlog and GNU@tie{}mcron.
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Old log files are removed or compressed according to the configuration.")
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(extensions (list (service-extension etc-service-type rottlog-etc)
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(service-extension mcron-service-type
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rottlog-jobs-or-default)
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;; Add Rottlog to the global profile so users can access
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;; the documentation.
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(service-extension profile-service-type
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(compose list rottlog-rottlog))))
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(compose concatenate)
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(extend (lambda (config rotations)
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(rottlog-configuration
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(inherit config)
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(rotations (append (rottlog-rotations config)
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rotations)))))
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(default-value (rottlog-configuration))))
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;;; admin.scm ends here
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