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AUTHOR: Sune Molgaard <sune at molgaard.org> |
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DATE: 2004-13-12 |
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LICENSE: Creative Commons Attribution-NonCommercial-ShareAlike License |
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http://creativecommons.org/licenses/by-nc-sa/1.0/ |
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SYNOPSIS: Installing the at daemon. |
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DESCRIPTION: |
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This hint will guide you through installing the at daemon, that facilitates delayed command execution. |
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Attachments: |
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http://www.linuxfromscratch.org/patches/downloads/at/at-3.1.8-fixes-1.patch |
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http://www.linuxfromscratch.org/patches/downloads/at/at-3.1.8-fcron.patch |
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PREREQUISITES: |
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An LFS system and sendmail and fcron from BLFS. |
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HINT: |
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========= |
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CONTENTS: |
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========= |
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1. Introduction |
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2. Package Dependencies |
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3. Package Installation |
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Download the package |
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Patch the package |
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Configure the build |
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Build the package |
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Install the package |
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Install the init script |
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4. Closing |
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================ |
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1. INTRODUCTION: |
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================ |
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The at package facilitates delayed program execution. The original location is no longer available, and the package seems to be maintained by debian now. |
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======================== |
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2. PACKAGE DEPENDENCIES: |
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======================== |
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At seems to depend on an MTA to report failures and such, so installing sendmail as per the BLFS book is recommended. Furthermore, it relies on a cron, and I have made the patch BLFS compliant, so that it relies on fcron. |
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===================== |
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PACKAGE INSTALLATION: |
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===================== |
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--------------------- |
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Download the package: |
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--------------------- |
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At seems to be maintained by debian now, so download the package from: |
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ftp://ftp.debian.org/debian/pool/main/a/at/at_3.1.8-11.tar.gz |
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----------------- |
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Patch the package |
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----------------- |
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patch -Np1 -i ../at-3.1.8-fixes-1.patch |
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patch -Np1 -i ../at-3.1.8-fcron.patch |
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-------------------- |
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Configure the build: |
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-------------------- |
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The values presented here are based on a relatively clean LFS/BLFS build, and should thus be appropriate for most. However, you may want to consult ./configure --help. |
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./configure --prefix=/usr --with-daemon_username=nobody --with-daemon_groupname=nogroup |
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------------------ |
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Build the package: |
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------------------ |
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make |
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make install |
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chmod 755 /var/spool/fcron |
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------------------------ |
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Install the init script: |
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------------------------ |
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cp debian/rc /etc/rc.d/init.d/atd |
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cat > /etc/rc.d/init.d/atd << "EOF" |
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#!/bin/sh |
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# Begin $rc_base/init.d/atd |
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# Based on various other init scripts. |
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# Rewritten by Sune Molgaard - sune@molgaard.org |
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. /etc/sysconfig/rc |
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. $rc_functions |
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case "$1" in |
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start) |
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echo "Starting atd..." |
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loadproc /usr/sbin/atd |
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;; |
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stop) |
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echo "Stopping atd..." |
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killproc atd |
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;; |
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restart) |
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$0 stop |
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sleep 1 |
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$0 start |
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;; |
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status) |
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statusproc atd |
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;; |
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*) |
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echo "Usage: $0 {start|stop|restart|status}" |
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exit 1 |
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;; |
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esac |
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# End $rc_base/init.d/atd |
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EOF |
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chmod 755 /var/spool/fcron |
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ln -s /etc/rc.d/init.d/atd /etc/rc.d/rc0.d/K07atd |
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ln -s /etc/rc.d/init.d/atd /etc/rc.d/rc2.d/S41atd |
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ln -s /etc/rc.d/init.d/atd /etc/rc.d/rc3.d/S41atd |
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ln -s /etc/rc.d/init.d/atd /etc/rc.d/rc4.d/S41atd |
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ln -s /etc/rc.d/init.d/atd /etc/rc.d/rc5.d/S41atd |
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ln -s /etc/rc.d/init.d/atd /etc/rc.d/rc6.d/K07atd |
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-------- |
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CLOSING: |
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-------- |
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I personally use the at package to schedule recordings of TV shows for when I am not at home. It can be used for a multitude of other scenarios where you have to schedule something to run at one specific time and date. |
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CHANGELOG: |
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[2004-12-05] |
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* Initial Release |
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[2004-12-09] |
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* Fixed a few typos... |
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[2004-12-09] |
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Remembered to fill in the "Patch the package" section... |
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[2004-12-13] |
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Another typo fix, and remembered to fill in the date section... |
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[2005-06-13] |
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Became aware of the fixes patch by Jim Gifford. Included it in the |
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hint. Changed link to fcron patch from personal site to lfs site. |
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