Re: :install and :update

Tim Hemel wrote:

> I am using aap to create an OS image. It consists of several
> components, which I gave their own subdir with their own aap recipe. I
> call them from a top recipe as follows:
> 
>         @for d in expand2list(_no.Subdirs):
>                 :print $d
>                 :execute {pass} $d/main.aap install
> 
> One of the subdirs contains a C program, that I let aap compile, using
> :program. However, when I run the top recipe, after succesfully installing
> everything from my subdirs, it gives the following message:
> 
> Aap: Error in recipe "Default target" line 1: :update failed for "mini_httpd"
> 
> Now that is interesting, because I never specified the :update command
> somewhere. It must be implicit then, but the manual is not very clear about
> this (or I must have overlooked something). From the command reference it
> checks whether a program needs to be updated. Exactly what does this do,
> what is the intent and how dows it work?

You must have used "mini_httpd" somewhere.  Perhaps you used the TARGET
variable?  This is still used as the default target.  It's a leftover
from an old version (and is going to be removed some day).

General rule: Uppercase variable names are defined by Aap.  Use
lowercase for your own variables.

> I could perhaps use it for the the rest of my recipe, because
> currently all the programs are still copied to my target directory
> without a check if they were installed before or not. I tried to
> implement this test using something akin to the freebsd ports
> collection, i.e. touching a file .install_done or something, but that
> is not really what I would like. If :update could do this, or of
> someone has a good suggestion on how to do that with aap, please let
> me know.

It depends on how you specify that the files are to be copied.  When
using a dependency it should be handled automatically.  If you have an
"install" target with a list of copy commands it won't work like that.

You could make an "install" target with a list of ":update" commands,
but you probably might as well have "install" list them as sources.

	install:  $root/bin/myprog $root/etc/my.conf

	$root/bin/myprog: myprog
		:copy {f} $source $target
	
	$root/etc/my.conf: my.conf
		:copy {f} $source $target

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