[systemd-devel] Idea: adding WantsFileBefore= and WantsFileAfter=?

[Ryan Gonzalez]

I know everyone here is super busy, but I just wanted to bump this a 
sec before letting it die to make sure it didn't just get lost or 
something. (If someone agrees that it should be a feature, I'd happily 
try to work on it.)

On Tue, Mar 20, 2018 at 4:08 PM, Ryan Gonzalez <rymg19 at gmail.com> wrote:
> Hello!!
> 
> Recently, I was trying to help out someone on IRC move some sysvinit 
> scripts over to systemd units, and there was one interesting issue 
> that came up. Many older daemons will create sockets at some 
> unspecified point in their startup sequence, with no indication of 
> when this occurs. In this case, it was a bit after the pid file, so 
> systemd started running units that required this socket ready before 
> it was actually ready.
> 
> Using socket activation here would be great, but again, this is an 
> older daemon, and AFAIK socket activation *always* requires a deamon 
> to read the socket path over stdin.
> 
> Here's my idea: what if there were WantsFileBefore= and 
> WantsFileAfter= options, that could be used like this:
> 
> [Service]
> Type=oneshot
> ExecStart=/usr/bin/my-service
> WantsFileBefore=this-file-should-be-existant-before-running-service
> WantsFileAfter=systemd-should-wait-until-this-file-exists-before-continuing
> 
> In short, WantsFileBefore=file would be roughly equivalent to 
> ExecPreStart=wait-for-file file, and WantsFileAfter=file would be 
> roughly equivalent to ExecPostStart=wait-for-file file. Of course, 
> now there would be no need to useless shell commands.
> 
> Thoughts?
> 
> --
> Ryan (ライアン)
> Yoko Shimomura, ryo (supercell/EGOIST), Hiroyuki Sawano >> everyone 
> else
> https://refi64.com/

--
Ryan (ライアン)
Yoko Shimomura, ryo (supercell/EGOIST), Hiroyuki Sawano >> everyone else
https://refi64.com/


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