If __FILE__ is relative, and something does chdir, __FILE__ will point to the wrong thing
I noticed you said *if* __FILE__ is relative. When is it relative and
when not? A simple program I wrote to trip up __FILE__ yields an
absolute path for some reason:
sub hello {
chdir '..';
my $file = __FILE__;
warn "My file name is $file. Here is my contents:";
open(my $fh, "<", $file);
my @data = <$fh>;
warn "@data";
}
hello();
1;
Maybe there is something wrong with the chdir, I am doing to keep my
Mojolicious::Lite app working under
PAR::Packer... perhaps ... I will meditate on this a bit
more.
You could argue it is a bug to rely on __FILE__ as always being absolute
Yes, I also think it's a less-than-appealing that __FILE__ is not always
absolute, dont you? And when is
__FILE__ computed?
Runtime? compiletime? How is it done?
I would argue it is a bug to put relative paths into @INC/%INC
See chdir and relative paths in @INC
Yes. Thank you for that data. That could save me a few hours of
debugging at some point. However, the whole topic of loading files and
relative paths on @INC is tangential to the issue with __FILE__,
correct?
I tried putting the @INC fixing code at the top of a script
demonstrating the __FILE__ problem with PAR and still have the anomaly
when using PAR. What chdir command might fix this? I will meditate on
that right after this post.
# works in plain perl, fails with this compilation line:
# pp -P -r -v 99 -o packed.pl somefile.pl
BEGIN {
use File::Spec;
for (@INC) {
if ( !ref $_ && -d $_ && !File::Spec->file_name_is_absolute($_
+) ) {
$_ = File::Spec->rel2abs($_);
}
}
}
sub hello {
my $file = __FILE__;
warn "My file name is $file. Here is my contents:";
open(my $fh, "<", $file);
my @data = <$fh>;
warn "@data";
}
hello();
1;
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.