[Scons-users] Starting with a clean installation directory

[Pico Geyer]

>

> Hi Pico,

>


Hi Marc,


>

> I think the error you saw with the AddPreAction approach arises because the

> install_dir directory has disappeared.  My understanding is that SCons

> expects all target directories to exists after it reads all the

> SConstruct/SConscript files (it creates the target dirs as needed as it

> scans

> those files).  So when it executes any Install() builders, all it does is

> copy files into existing directories.

>


Yes, I think you're right there.
Scons certainly doesn't like it when I remove a directory it expects to be
there.



> So your AddPreAction() approach should work if you take care to not delete

> the directory itself (and any sub-directories), or re-create it (them)

> after

> deleting.  Maybe something like:

>

> env.AddPreAction(t_all_install, "find ../install_dir -type f -delete")

>


Ah, yes, I did eventually notice this as well. I started doing this:
env.AddPreAction(t_all_install,
[Delete('../install_dir'),Mkdir('../install_dir')])

But I think my version might fail at some other point, so your solution is
nicer.
Thanks!

Pico
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