App::ChangeShebang - change shebang lines for relocatable perl
> change-shebang /path/to/bin/script.pl
> head -3 /path/to/bin/script.pl
#!/bin/sh
exec "$(dirname "$0")"/perl -x "$0" "$@"
#!perl
change-shebang changes shebang lines from
#!/path/to/bin/perl
to
#!/bin/sh
exec "$(dirname "$0")"/perl -x "$0" "$@"
#!perl
Why do we need this?
Let's say you build perl with relocatable enabled (-Duserelocatableinc).
Then the shebang lines of executable scripts point at
the installation time perl binary path.
So if you move your perl directory to other places, the shebang lines of executable scripts point at a wrong perl binary and we cannot execute scripts. Oops!
A solution of that problem is to replace shebang lines by
#!/bin/sh
exec "$(dirname "$0")"/perl -x "$0" "$@"
#!perl
which means that scripts will be executed by the perl located in the same directory.
- Relocatable installations in perl5100delta.pod
- https://github.com/shoichikaji/relocatable-perl
- https://github.com/shoichikaji/relocatable-perl-growthforecast
Shoichi Kaji skaji@cpan.org
Copyright 2018 Shoichi Kaji skaji@cpan.org
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.