[Scons-users] Starting with a clean installation directory

[Pico Geyer]

Hi all.

I seem to be struggling with something that should be quite trivial.
I would like to delete my installation directory to get rid of any stale
files before installing my various targets.

So my first thought was that I should make my installation targets depend
on a command that deletes the installation directory. Something like this:
env = Environment()
t_all_install = []
del_cmd = env.Command('../install_dir', [], Delete('$TARGET'))
t_all_install.append(env.Install('../install_dir', 'foo2.txt'))
t_all_install.append(env.Install('../install_dir', 'foo.txt'))
env.Depends(t_all_install, del_cmd)
env.Default(t_all_install)

But this creates a horrible dependency cycle:
  sconstest/install_dir -> sconstest/install_dir/foo.txt ->
sconstest/install_dir
  sconstest/install_dir/foo2.txt -> sconstest/install_dir ->
sconstest/install_dir/foo2.txt

I then tried to use a AddPreAction to Delete the install directory instead
env.AddPreAction(t_all_install, Delete('../install_dir'))

But this seems to manage to delete the directory but then fails at the very
next command:
Delete("../install_dir")
Install file: "foo2.txt" as "[snip]/install_dir/foo2.txt"
scons: *** [[snip]/sconstest/install_dir/foo2.txt]
[snip]/sconstest/install_dir/foo2.txt: No such file or directory


What's the simplest way to achieve this?
Thanks in advance!
Pico
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