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#!/bin/sh

# GNU Guix --- Functional package management for GNU
# Copyright © 2012, 2013, 2014, 2015, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2017 Eric Bavier <bavier@cray.com>
#
# 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/>.

# Usage: ./pre-inst-env COMMAND ARG...
#
# Run COMMAND in a pre-installation environment.  Typical use is
# "./pre-inst-env guix build hello".

# By default we may end up with absolute directory names that contain '..',
# which get into $GUILE_LOAD_PATH, leading to '..' in the module file names
# recorded by Guile.  To avoid that, make sure we get a real absolute
# directory name.  Additionally, use '-P' to get the canonical directory name
# so that Guile's 'relative' %file-port-name-canonicalization can actually
# work (see <http://bugs.gnu.org/17935>.)
abs_top_srcdir="`cd "@abs_top_srcdir@" > /dev/null; pwd -P`"
abs_top_builddir="`cd "@abs_top_builddir@" > /dev/null; pwd -P`"

GUILE_LOAD_COMPILED_PATH="$abs_top_builddir${GUILE_LOAD_COMPILED_PATH:+:}$GUILE_LOAD_COMPILED_PATH"
GUILE_LOAD_PATH="$abs_top_builddir:$abs_top_srcdir${GUILE_LOAD_PATH:+:}$GUILE_LOAD_PATH"
export GUILE_LOAD_COMPILED_PATH GUILE_LOAD_PATH

# Define $PATH so that `guix' and friends are easily found.

PATH="$abs_top_builddir/scripts:$abs_top_builddir:$PATH"
export PATH

# The daemon invokes 'guix'; tell it which one to use.
GUIX="$abs_top_builddir/scripts/guix"
export GUIX

# The following variables need only be defined when compiling Guix
# modules, but we define them to be on the safe side in case of
# auto-compilation.

NIX_HASH="@NIX_HASH@"
export NIX_HASH

# Define $GUIX_UNINSTALLED to prevent `guix' from
# prepending @guilemoduledir@ to the Guile load paths.

GUIX_UNINSTALLED=1
export GUIX_UNINSTALLED

exec "$@"
me 'schedule) (documentation "Display jobs that are going to be scheduled.") (procedure #~(lambda* (_ #:optional (n "5")) ;; XXX: This is a global side effect. (setenv "GUILE_AUTO_COMPILE" "0") ;; Run 'mcron' in a pipe so we can explicitly redirect its output to ;; 'current-output-port', which at this stage is bound to the client ;; connection. (let ((pipe (open-pipe* OPEN_READ #$(file-append mcron "/bin/mcron") (string-append "--schedule=" n) #$@files))) (let loop () (match (read-line pipe 'concat) ((? eof-object?) (catch 'system-error (lambda () (zero? (close-pipe pipe))) (lambda args ;; There's a race with the SIGCHLD handler, which ;; could call 'waitpid' before 'close-pipe' above does. If ;; we get ECHILD, that means we lost the race, but that's ;; fine. (or (= ECHILD (system-error-errno args)) (apply throw args))))) (line (display line) (loop))))))))) (define (mcron-shepherd-services config) (match-record config <mcron-configuration> (mcron jobs log? log-file log-format date-format home-service?) (if (eq? jobs '()) '() ;nothing to do (let ((files (job-files mcron jobs))) (list (shepherd-service (provision '(mcron)) (requirement (if home-service? '() '(user-processes))) (modules `((srfi srfi-1) (srfi srfi-26) (ice-9 popen) ;for the 'schedule' action (ice-9 rdelim) (ice-9 match) ((shepherd support) #:hide (mkdir-p)) ;for '%user-log-dir' ,@%default-modules)) (start #~(make-forkexec-constructor (list #$(file-append mcron "/bin/mcron") #$@(if log? `("--log" "--log-format" ,log-format ,@(if date-format (list "--date-format" date-format) '())) '()) #$@files) ;; Disable auto-compilation of the job files and ;; set a sane value for 'PATH'. #:environment-variables (cons* "GUILE_AUTO_COMPILE=0" #$(if home-service? '(environ) '(cons* "PATH=/run/current-system/profile/bin" (remove (cut string-prefix? "PATH=" <>) (environ))))) #:log-file #$log-file)) (stop #~(make-kill-destructor)) (actions (list (shepherd-schedule-action mcron files))))))))) (define mcron-service-type (service-type (name 'mcron) (description "Run the mcron job scheduling daemon.") (extensions (list (service-extension shepherd-root-service-type mcron-shepherd-services) (service-extension profile-service-type (compose list mcron-configuration-mcron)))) (compose concatenate) (extend (lambda (config jobs) (mcron-configuration (inherit config) (home-service? (mcron-configuration-home-service? config)) (jobs (append (mcron-configuration-jobs config) jobs))))) (default-value (mcron-configuration)))) ;empty job list (define-configuration/no-serialization cron-daemon-configuration (cron (package mcron) "The cron package to use.") (monitor-etc? (boolean #f) "Whether to check /etc/crontab for updates.")) (define (cron-daemon-shepherd-services config) (list (shepherd-service (provision '(cron-daemon)) (start #~(make-forkexec-constructor '(#$(file-append (cron-daemon-configuration-cron config) "/sbin/cron") #$@(if (cron-daemon-configuration-monitor-etc? config) '() '("--noetc"))) #:pid-file "/var/run/cron.pid")) (stop #~(make-kill-destructor))))) (define cron-daemon-activation (const #~(mkdir-p "/var/cron/tabs"))) (define (cron-daemon-setuid-programs config) (list (privileged-program (program (file-append (cron-daemon-configuration-cron config) "/sbin/crontab-access"))))) (define cron-daemon-service-type (service-type (name 'cron-daemon) (description "Run the traditional cron daemon.") (extensions (list (service-extension shepherd-root-service-type cron-daemon-shepherd-services) (service-extension activation-service-type cron-daemon-activation) (service-extension privileged-program-service-type cron-daemon-setuid-programs))) (default-value (cron-daemon-configuration)))) ;;; mcron.scm ends here