:: Re: [DNG] systemd is haunting me
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著者: Didier Kryn
日付:  
To: dng
題目: Re: [DNG] systemd is haunting me
Le 02/02/2016 04:39, Simon Wise a écrit :
> so looking at apt.conf I see as the very first text 'DESCRIPTION'
>
> /etc/apt/apt.conf is the main configuration file shared by all
>        the tools in the APT suite of tools, though it is by no means
>        the only place options can be set. The suite also shares a
>        common command line parser to provide a uniform environment.

>
>        When an APT tool starts up it will read the configuration
>        files in the following order:

>
>         1. the file specified by the APT_CONFIG environment variable
>            (if any)

>
>         2. all files in Dir::Etc::Parts in alphanumeric ascending
>            order which have either no or "conf" as filename extension
>            and which only contain alphanumeric, hyphen (-),
>            underscore (_) and period (.) characters. Otherwise APT
>            will print a notice that it has ignored a file, unless
>            that file matches a pattern in the
>            Dir::Ignore-Files-Silently configuration list - in which
>            case it will be silently ignored.

>
>         3. the main configuration file specified by Dir::Etc::main

>
>         4. the command line options are applied to override the
>            configuration directives or to load even more
>            configuration files.

>
>
> Dir::Etc::Parts is in fact apt.conf.d/
>
> as seen by going to the FILES section at the end of the manpage,
> either with a search for Dir::Etc::Parts or because you know a FILES
> section usually exists:
>
> FILES
>        /etc/apt/apt.conf
>            APT configuration file. Configuration Item:
>            Dir::Etc::Main.

>
> /etc/apt/apt.conf.d/
>            APT configuration file fragments. Configuration Item:
>            Dir::Etc::Parts.


     This is also in man apt.conf, but - call me an idiot - I still 
can't make sense of it. What the hell is the meaning of the words 'Dir', 
'Etc', 'Main' and 'Parts'? Why the hell do '::' translate to '/' ? What 
document did you learn that "language" from?


     Another point: I'd expect the configuration tool to provide a way 
to specify a scope for any parameter setting, something which could, for 
example, restrict the scope of the line 'APT::Install-Recommends 
"false";' to synaptic, eg simply 'SYNAPTIC::Install-Recommends "false";'


     Maybe, since Synaptic is a front-end to apt, the rationale is it is 
also intended to tune apt proper. I admit it makes sense. It's imperfect 
because the setting is lost if you purge synaptic but nothing can be 
perfect.


     Didier