Recommended use of FindBin

[Stefan Adams]

I have a question about a recommendation in the Cookbook.  In Making your application installable, it is recommended to use FindBin, but reading the POD of FindBin seems to recommend avoiding the use of FindBin for CPAN modules.

Am I misunderstanding the FindBin recommendation or is this a conflict?

Making your application installable

Finally a few small changes should be made to the application script. The shebang becomes the recommended #!perl, which the toolchain rewrites to the proper shebang during installation. Also use FindBin rather than lib, since installable scripts can't use lib without breaking updated dual-life modules.

FindBin(3)

KNOWN ISSUES

       If there are two modules using "FindBin" from different directories under the same interpreter, this won't work. Since "FindBin" uses a "BEGIN" block, it'll be executed only once, and only the first caller will get it right. This is a problem under mod_perl and other persistent Perl environments, where you shouldn't use this module. Which also means that you should avoid using "FindBin" in modules that you plan to put on CPAN. To make sure that "FindBin" will work is to call the "again" function:

[sri]

FindBin(3)

KNOWN ISSUES

       If there are two modules using "FindBin" from different directories under the same interpreter, this won't work. Since "FindBin" uses a "BEGIN" block, it'll be executed only once, and only the first caller will get it right. This is a problem under mod_perl and other persistent Perl environments, where you shouldn't use this module. Which also means that you should avoid using "FindBin" in modules that you plan to put on CPAN. To make sure that "FindBin" will work is to call the "again" function:

https://github.com/kraih/mojo/blob/master/lib/Mojo/Server.pm#L49

--

sebastian 

[Stefan Adams]

Oh!  Is it that line that allows us to use FindBin in our CPAN modules without consequence, then?  That is, because of your use of FindBin->again our apps are in the clear and exempt from the recommendation to "avoid using FindBin"?