Andrei Borzenkov <arvidj...@gmail.com> wrote on 03/11/2015 08:47:43 PM:
> From: Andrei Borzenkov <arvidj...@gmail.com> > To: aaron_wri...@selinc.com > Cc: systemd-devel@lists.freedesktop.org > Date: 03/11/2015 08:47 PM > Subject: Re: [systemd-devel] minimal required units > > В Wed, 11 Mar 2015 12:02:29 -0700 > aaron_wri...@selinc.com пишет: > > > I'm trying to make an embedded device, and I would like to start with the > > minimal setup as possible. Are there some units that are required by > > systemd? > > I ask because systemd is complaining about a missing rescue.target unit, > > When does it do it? It was doing this because my default unit was not set correctly. But that isn't really the question. The question is, what units are required by systemd? How can I figure that out? It seems like rescue.target, local-fs.target, and local-fs-pre.target are required, but I've only discovered that after trial and error. I know the systemd.special man page lists a ton of special units, but it seems that not all of them are required. Right? Well, which ones are? I feel like I need to look through the code to see when a hardcoded unit is referenced, like rescue.target was, that I don't know about. My device doesn't have many of the same requirements of a full desktop or server Linux, so I'm trying to strip out things from systemd, unit wise, that I don't want or need. I've customized sysinit.target and basic.target to just reference the units I want. And that seems to be going smooth, but it appears there are other units, that I didn't know about that are required, but that aren't documented as such (that I could find). This scares me a bit. > > > but I don't list rescue.target as a dependency of any other unit. > > However, grep tells me that /usr/lib/systemd/systemd contains the > > "rescue.target" string, which worries me. Is there a list of all the units > > that are required, even though no other unit lists them?
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