Date: Mon, 02 Dec 2013 10:45:09 -0800 From: Colin Percival <cperciva@freebsd.org> To: Hiroki Sato <hrs@FreeBSD.org> Cc: freebsd-rc@FreeBSD.org Subject: Re: RFC: support for re-sourcing /etc/rc.conf Message-ID: <529CD535.5010903@freebsd.org> In-Reply-To: <20131202.214853.1540734630471865242.hrs@allbsd.org> References: <529BEDDB.8010003@freebsd.org> <20131202.214853.1540734630471865242.hrs@allbsd.org>
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On 12/02/13 04:48, Hiroki Sato wrote: > Colin Percival <cperciva@freebsd.org> wrote: > cp> I'd like to commit the attached patch to /etc/rc. When SIGALRM is received, > cp> it reloads /etc/rc.conf; this makes it possible for an rc.d script to perform > cp> first-boot system configuration and have it reflected by other rc.d scripts. > cp> > cp> In particular, this will allow me to provide EC2 user-data of > cp> >>/etc/rc.conf > cp> firstboot_pkgs_enable="YES" > cp> firstboot_pkgs_list="apache22" > cp> to an image with the sysutils/ec2-scripts and sysutils/firstboot-pkgs ports > cp> installed, and have a system running with apache22 installed moments later. > > I am not familiar with sysutils/firstboot-pkgs and its use case, but > is it correct that packages are installed during /etc/rc and then > rc.conf will be updated before rc.d scripts for the installed > packages run from /etc/rc? Where and when SIGALRM is sent from? No, the other way around -- a different script (part of ec2-scripts) updates /etc/rc.conf based on metadata provided at VM launch time. One use of this would be to set firstboot_pkgs_* variables to control the behaviour of the firstboot-pkgs port moments later in the boot process. So: 1. VM image is created with ec2-scripts and firstboot-pkgs installed. 2. VM image is launched with user-data saying "I want apache22". 3. Early in the boot process, ec2-scripts reads that user-data, updates /etc/rc.conf, and signals /etc/rc. 4. /etc/rc re-sources /etc/rc.conf. 5. Later in the boot process, firstboot-pkgs (having the new /etc/rc.conf settings loaded) installs the apache22 package. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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