"Daniel J. Luke" <[email protected]> writes:
> I noticed today that an app I'm working on will start fine only if the
> user who is running the app can read the current directory (ie, if I'm
> starting it as a user dedicated to running the app, that user must
> have read permission on CWD).
>
> Couldn't load class (MYAPP::Script::FastCGI) because: Can't locate
> MYAPP/Script/FastCGI.pm: Permission denied at
> /path/to/perl-5.20.0/lib/site_perl/5.20.0/Catalyst/ScriptRunner.pm line 13.
> Catalyst::ScriptRunner::find_script_class("Catalyst::ScriptRunner",
> "MYAPP", "FastCGI") called at
> /path/to/perl/perl-5.20.0/lib/site_perl/5.20.0/Catalyst/ScriptRunner.pm line
> 42
> Catalyst::ScriptRunner::run("Catalyst::ScriptRunner", "MYAPP",
> "FastCGI") called at /path/to/MYAPP/script/MYAPP_fastcgi.pl line 4
>
> strace shows the difference between a successful launch and a failed
> one is whether we get EACCESS or ENOENT when looking for
> ./MYAPP/Script/FastCGI.pm
This is due to require as of 5.18 no longer silently ignoring errors
when trying to load a module:
require dies for unreadable files
When require encounters an unreadable file, it now dies. It used
to ignore the file and continue searching the directories in @INC
[perl #113422].
https://metacpan.org/pod/perl5180delta#require-dies-for-unreadable-files
Combined with the fact that Catalyst::ScriptRunner tries to load the
optional (but in your case non-existent) MYAPP::Script::FastCGI, and
that '.' is in @INC by the default, it gives this (somewhat annoying)
behaviour.
For daemons it is generally a good idea to cd to / or some
application-specific directory before starting up, to avoid e.g. it
accidentally hanging onto a mount point.
> failure:
> stat("./MYAPP/Script/FastCGI.pmc", 0x7fffa8eba720) = -1 EACCES (Permission
> denied)
> stat("./MYAPP/Script/FastCGI.pm", 0x7fffa8eba660) = -1 EACCES (Permission
> denied)
>
> success:
> stat("./MYAPP/Script/FastCGI.pmc", 0x7fff80e76db0) = -1 ENOENT (No such file
> or directory)
> stat("./MYAPP/Script/FastCGI.pm", 0x7fff80e76cf0) = -1 ENOENT (No such file
> or directory)
>
> I didn't see this documented anywhere - am I missing some obvious reason why
> this behavior is desired?
--
"I use RMS as a guide in the same way that a boat captain would use
a lighthouse. It's good to know where it is, but you generally
don't want to find yourself in the same spot." - Tollef Fog Heen
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