Re: [Module::Build] ./Build on Win98

[demerphq <dem...@gm...>]

On 2/22/06, Randy W. Sims <ml...@th...> wrote:
> Joshua ben Jore wrote:
> > On 2/22/06, Nick Ing-Simmons <ni...@in...> wrote:
> >> Randy W. Sims <Ra...@Th...> writes:
> >
> >> Build.bat cannot delete itself on Windows.
> >> You can't delete executing things. This is why Windows needs to
> >> reboot after installing upgrades.
> >> A running thing can ask for a delete on next reboot, but cannot delete
> >> an open file.
> >
> > You can have it delete itself if you can manage to call the CreateFile
> > Win32 API function with the FILE_FLAG_DELETE_ON_CLOSE flag. At least
> > that's what demerphq told p5p about something similar when trying to
> > get M::B to be able to install Cwd.
>
> That's true of binary executable images, batch scripts turn out to be
> different...
>
> We start with a perl script 'Build', run it through the 'pl2bat' utility
> which prefaces it with a batch script that invokes the perl interpreter
> with itself, skipping the batch header. This produces the 'Build.bat'
> file that we execute. Perl reads the entire file in, closing the handle.
>
> Initially, we tried deleting the 'Build.bat' from the perl side of the
> script. It worked: the file was unlinked. But when execution returned
> the shell, the batch script was no longer there, producing the "not
> found" error. This seems to imply that batch files are opened, read &
> executed one line at a time. This is important.
>
> The final solution, the one being tweaked now because of slight syntax
> differences between commands on 9x vs NT, involves appending DOS
> commands to the end of the batch script during the execution of the
> 'realclean' action. The general solution was suggested by some people in
> the alt.msdos.batch newsgroup. Basically, it's executing the following
> commands from a batch file:

And actually if you go back to the early mails on this, i suggested
something along these lines at that time.

(One nice use of this trick is that you can write a perl script that
is then run through pl2bat which is capable of altering its parents
enviornment.)

Cheers,
yves

--
perl -Mre=3Ddebug -e "/just|another|perl|hacker/"