guix-devel/gnu/services/admin.scm

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
;;; Copyright © 2016, 2017 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 thye GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (gnu services admin)
#:use-module (gnu packages admin)
#:use-module (gnu packages base)
#:use-module (gnu packages logging)
#:use-module (gnu services)
#:use-module (gnu services mcron)
#:use-module (gnu services shepherd)
#:use-module (gnu services web)
#:use-module (gnu system shadow)
#:use-module (guix gexp)
#:use-module (guix store)
#:use-module (guix packages)
#:use-module (guix records)
#:use-module (srfi srfi-1)
#:use-module (ice-9 vlist)
#:use-module (ice-9 match)
#:export (%default-rotations
%rotated-files
log-rotation
log-rotation?
log-rotation-frequency
log-rotation-files
log-rotation-options
log-rotation-post-rotate
rottlog-configuration
rottlog-configuration?
rottlog-service
rottlog-service-type
<tailon-configuration-file>
tailon-configuration-file
tailon-configuration-file?
tailon-configuration-file-files
tailon-configuration-file-bind
tailon-configuration-file-relative-root
tailon-configuration-file-allow-transfers?
tailon-configuration-file-follow-names?
tailon-configuration-file-tail-lines
tailon-configuration-file-allowed-commands
tailon-configuration-file-debug?
tailon-configuration-file-http-auth
tailon-configuration-file-users
<tailon-configuration>
tailon-configuration
tailon-configuration?
tailon-configuration-config-file
tailon-configuration-package
tailon-service-type))
;;; Commentary:
;;;
;;; This module implements configuration of rottlog by writing
;;; /etc/rottlog/{rc,hourly|daily|weekly}. Example usage
;;;
;;; (mcron-service)
;;; (service rottlog-service-type)
;;;
;;; Code:
(define-record-type* <log-rotation> log-rotation make-log-rotation
log-rotation?
(files log-rotation-files) ;list of strings
(frequency log-rotation-frequency ;symbol
(default 'weekly))
(post-rotate log-rotation-post-rotate ;#f | gexp
(default #f))
(options log-rotation-options ;list of strings
(default '())))
(define %rotated-files
;; Syslog files subject to rotation.
'("/var/log/messages" "/var/log/secure" "/var/log/maillog"))
(define %default-rotations
(list (log-rotation ;syslog files
(files %rotated-files)
;; Restart syslogd after rotation.
(options '("sharedscripts"))
(post-rotate #~(let ((pid (call-with-input-file "/var/run/syslog.pid"
read)))
(kill pid SIGHUP))))
(log-rotation
(files '("/var/log/shepherd.log" "/var/log/guix-daemon.log")))))
(define (log-rotation->config rotation)
"Return a string-valued gexp representing the rottlog configuration snippet
for ROTATION."
(define post-rotate
(let ((post (log-rotation-post-rotate rotation)))
(and post
(program-file "rottlog-post-rotate.scm" post))))
#~(let ((post #$post-rotate))
(string-append (string-join '#$(log-rotation-files rotation) ",")
" {"
#$(string-join (log-rotation-options rotation)
"\n " 'prefix)
(if post
(string-append "\n postrotate\n " post
"\n endscript\n")
"")
"\n}\n")))
(define (log-rotations->/etc-entries rotations)
"Return the list of /etc entries for ROTATIONS, a list of <log-rotation>."
(define (frequency-file frequency rotations)
(computed-file (string-append "rottlog." (symbol->string frequency))
#~(call-with-output-file #$output
(lambda (port)
(for-each (lambda (str)
(display str port))
(list #$@(map log-rotation->config
rotations)))))))
(let* ((frequencies (delete-duplicates
(map log-rotation-frequency rotations)))
(table (fold (lambda (rotation table)
(vhash-consq (log-rotation-frequency rotation)
rotation table))
vlist-null
rotations)))
(map (lambda (frequency)
`(,(symbol->string frequency)
,(frequency-file frequency
(vhash-foldq* cons '() frequency table))))
frequencies)))
(define (default-jobs rottlog)
(list #~(job '(next-hour '(0)) ;midnight
(lambda ()
(system* #$(file-append rottlog "/sbin/rottlog"))))
#~(job '(next-hour '(12)) ;noon
(lambda ()
(system* #$(file-append rottlog "/sbin/rottlog"))))))
(define-record-type* <rottlog-configuration>
rottlog-configuration make-rottlog-configuration
rottlog-configuration?
(rottlog rottlog-rottlog ;package
(default rottlog))
(rc-file rottlog-rc-file ;file-like
(default (file-append rottlog "/etc/rc")))
(rotations rottlog-rotations ;list of <log-rotation>
(default %default-rotations))
(jobs rottlog-jobs ;list of <mcron-job>
(default #f)))
(define (rottlog-etc config)
`(("rottlog"
,(file-union "rottlog"
(cons `("rc" ,(rottlog-rc-file config))
(log-rotations->/etc-entries
(rottlog-rotations config)))))))
(define (rottlog-jobs-or-default config)
(or (rottlog-jobs config)
(default-jobs (rottlog-rottlog config))))
(define rottlog-service-type
(service-type
(name 'rottlog)
(description
"Periodically rotate log files using GNU@tie{}Rottlog and GNU@tie{}mcron.
Old log files are removed or compressed according to the configuration.")
(extensions (list (service-extension etc-service-type rottlog-etc)
(service-extension mcron-service-type
rottlog-jobs-or-default)
;; Add Rottlog to the global profile so users can access
;; the documentation.
(service-extension profile-service-type
(compose list rottlog-rottlog))))
(compose concatenate)
(extend (lambda (config rotations)
(rottlog-configuration
(inherit config)
(rotations (append (rottlog-rotations config)
rotations)))))
(default-value (rottlog-configuration))))
;;;
;;; Tailon
;;;
(define-record-type* <tailon-configuration-file>
tailon-configuration-file make-tailon-configuration-file
tailon-configuration-file?
(files tailon-configuration-file-files
(default '("/var/log")))
(bind tailon-configuration-file-bind
(default "localhost:8080"))
(relative-root tailon-configuration-file-relative-root
(default #f))
(allow-transfers? tailon-configuration-file-allow-transfers?
(default #t))
(follow-names? tailon-configuration-file-follow-names?
(default #t))
(tail-lines tailon-configuration-file-tail-lines
(default 200))
(allowed-commands tailon-configuration-file-allowed-commands
(default '("tail" "grep" "awk")))
(debug? tailon-configuration-file-debug?
(default #f))
(wrap-lines tailon-configuration-file-wrap-lines
(default #t))
(http-auth tailon-configuration-file-http-auth
(default #f))
(users tailon-configuration-file-users
(default #f)))
(define (tailon-configuration-files-string files)
(string-append
"\n"
(string-join
(map
(lambda (x)
(string-append
" - "
(cond
((string? x)
(simple-format #f "'~A'" x))
((list? x)
(string-join
(cons (simple-format #f "'~A':" (car x))
(map
(lambda (x) (simple-format #f " - '~A'" x))
(cdr x)))
"\n"))
(else (error x)))))
files)
"\n")))
(define-gexp-compiler (tailon-configuration-file-compiler
(file <tailon-configuration-file>) system target)
(match file
(($ <tailon-configuration-file> files bind relative-root
allow-transfers? follow-names?
tail-lines allowed-commands debug?
wrap-lines http-auth users)
(text-file
"tailon-config.yaml"
(string-concatenate
(filter-map
(match-lambda
((key . #f) #f)
((key . value) (string-append key ": " value "\n")))
`(("files" . ,(tailon-configuration-files-string files))
("bind" . ,bind)
("relative-root" . ,relative-root)
("allow-transfers" . ,(if allow-transfers? "true" "false"))
("follow-names" . ,(if follow-names? "true" "false"))
("tail-lines" . ,(number->string tail-lines))
("commands" . ,(string-append "["
(string-join allowed-commands ", ")
"]"))
("debug" . ,(if debug? "true" #f))
("wrap-lines" . ,(if wrap-lines "true" "false"))
("http-auth" . ,http-auth)
("users" . ,(if users
(string-concatenate
(cons "\n"
(map (match-lambda
((user . pass)
(string-append
" " user ":" pass)))
users)))
#f)))))))))
(define-record-type* <tailon-configuration>
tailon-configuration make-tailon-configuration
tailon-configuration?
(config-file tailon-configuration-config-file
(default (tailon-configuration-file)))
(package tailon-configuration-package
(default tailon)))
(define tailon-shepherd-service
(match-lambda
(($ <tailon-configuration> config-file package)
(list (shepherd-service
(provision '(tailon))
(documentation "Run the tailon daemon.")
(start #~(make-forkexec-constructor
`(,(string-append #$package "/bin/tailon")
"-c" ,#$config-file)
#:user "tailon"
#:group "tailon"))
(stop #~(make-kill-destructor)))))))
(define %tailon-accounts
(list (user-group (name "tailon") (system? #t))
(user-account
(name "tailon")
(group "tailon")
(system? #t)
(comment "tailon")
(home-directory "/var/empty")
(shell (file-append shadow "/sbin/nologin")))))
(define tailon-service-type
(service-type
(name 'tailon)
(description
"Run Tailon, a Web application for monitoring, viewing, and searching log
files.")
(extensions
(list (service-extension shepherd-root-service-type
tailon-shepherd-service)
(service-extension account-service-type
(const %tailon-accounts))))
(compose concatenate)
(extend (lambda (parameter files)
(tailon-configuration
(inherit parameter)
(config-file
(let ((old-config-file
(tailon-configuration-config-file parameter)))
(tailon-configuration-file
(inherit old-config-file)
(files (append (tailon-configuration-file-files old-config-file)
files))))))))
(default-value (tailon-configuration))))
;;; admin.scm ends here