Re: [Mojolicious] Systemd "Can't locate Mojo/Base.pm in @INC"

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Dan Book

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Apr 28, 2021, 5:33:23 PMApr 28
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You have installed it to a local::lib in the perlbrew. The systemd service won't have that active. You could fix it by adding to the [Service] block:

Environment="PERL5LIB=/srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccdapi/lib/perl5"

On Wed, Apr 28, 2021 at 5:28 PM llaro...@gmail.com <llaro...@gmail.com> wrote:
Hi, I'm trying to register my hypnotoad daemon as a service in

      cat /lib/systemd/system/ccdapi.service
[Unit]
Description=MY CCDAPI LAB
Requires=network.target
After=network.target
User=ccdapi
Group=ccdapi
# put here other service requirements

[Service]
User=ccdapi
Group=ccdapi
Type=simple
Restart=always
SyslogIdentifier=ccdapi
PIDFile=/home/srv/ccdapi/v1/etc/ccdapi.pid
ExecStart=/srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccdapi/bin/hypnotoad /srv/ccdapi/VM01/PROD/v1/ccdapi.pl -f
ExecStop=/srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccdapi/bin/hypnotoad -s /srv/ccdapi/VM01/PROD/v1/ccdapi.pl
ExecReload=/srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccdapi/bin/hypnotoad /srv/ccdapi/VM01/PROD/v1/ccdapi.pl
KillMode=process
WorkingDirectory=/srv/ccdapi

[Install]
WantedBy=multi.user.target

When I try to start the service I get 

-- Unit ccdapi.service has begun starting up.
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca ccdapi[63200]: Can't locate Mojo/Base.pm in @INC (you may need to install the Mojo::Base module) (@INC contains: /srv/ccdapi/perl5/perlbrew/perls/perl-5.24.0/lib/site_perl/5.24.0/x86_64-linux 
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca ccdapi[63200]: BEGIN failed--compilation aborted at /srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccdapi/bin/hypnotoad line 2.
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: ccdapi.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca ccdapi[63201]: Can't locate Mojo/Base.pm in @INC (you may need to install the Mojo::Base module) (@INC contains: /srv/ccdapi/perl5/perlbrew/perls/perl-5.24.0/lib/site_perl/5.24.0/x86_64-linux 
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca ccdapi[63201]: BEGIN failed--compilation aborted at /srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccdapi/bin/hypnotoad line 2.
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: ccdapi.service: control process exited, code=exited status=2
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: Unit ccdapi.service entered failed state.
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: ccdapi.service failed.
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: ccdapi.service holdoff time over, scheduling restart.
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: start request repeated too quickly for ccdapi.service
Apr 28 16:41:48 vl-vm-sr824.lb.videotron.ca systemd[1]: Failed to start MY CCDAPI LAB.
-- Subject: Unit ccdapi.service has failed
-- Defined-By: systemd


So I've double-checked Mojo::Base exists ...

[ccdapi@vl-vm-sr824 ~]$ find . | grep 'Mojo.*Base.pm'
./VM01/PROD/perl5/lib/perl5/Mojo/Base.pm
./VM01/perl5/lib/perl5/Mojo/Base.pm
./temp/report/bin/lib/Mojo/Base.pm
./.cpan/build/Mojolicious-7.37-yGj97y/blib/lib/Mojo/Base.pm
./.cpan/build/Mojolicious-7.37-yGj97y/lib/Mojo/Base.pm
./.perlbrew/libs/perl-5.24.0@ccdapi/lib/perl5/Mojo/Base.pm
./perl5/lib/perl5/Mojo/Base.pm


And I have added the path with "use lib qw(/my/path/) such as

[ccdapi@vl-vm-sr824 ~]$ head ./VM01/PROD/v1/ccdapi.pl
use lib qw(/srv/ccdapi/perl5/lib/perl5/);
use Mojolicious::Lite;


But still it won't start. Can anyone help please ? I'm aware this seems like a general Perl problem though but not so sure what am I doing wrong or is there some sort of bug ?!

Cheers,
Luc

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Dan Book

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Apr 28, 2021, 5:35:37 PMApr 28
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On Wed, Apr 28, 2021 at 5:28 PM llaro...@gmail.com <llaro...@gmail.com> wrote:
And I have added the path with "use lib qw(/my/path/) such as

[ccdapi@vl-vm-sr824 ~]$ head ./VM01/PROD/v1/ccdapi.pl
use lib qw(/srv/ccdapi/perl5/lib/perl5/);
use Mojolicious::Lite;

Make sure to remove this. The local::lib you have in ~/perl5/lib/perl5 is not compatible with perlbrew.

-Dan 

llaro...@gmail.com

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Apr 28, 2021, 8:52:03 PMApr 28
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I removed the first line and added the "Environment" entry in Service section, now I have a new issue ... home made modules

Apr 28 20:10:45 vl-vm-sr824.lb systemd[1]: Started MY CCDAPI LAB.
Apr 28 20:10:45 vl-vm-sr824.lb systemd[1]: Starting MY CCDAPI LAB...
Apr 28 20:10:45 vl-vm-sr824.lb ccdapi[63913]: Can't load application from file "/srv/ccdapi/VM01/PROD/v1/ccdapi.pl": Can't locate Methods/cmtsc.pm in @INC (you may need to install the Methods::cmtsc module...x /srv/ccdapi/.
Apr 28 20:10:45 vl-vm-sr824.lb ccdapi[63913]: BEGIN failed--compilation aborted at /srv/ccdapi/VM01/PROD/v1/ccdapi.pl line 10.
Apr 28 20:10:45 vl-vm-sr824.lb ccdapi[63913]: Compilation failed in require at (eval 80) line 1.
Apr 28 20:10:45 vl-vm-sr824.lb systemd[1]: ccdapi.service: main process exited, code=exited, status=2/INVALIDARGUMENT

They are in the path of my application. I tried "use lib qw(/path/Methods/) but it failed too

I tried a list in environement separated by ";" but it failed too.

What am I missing ?

Dan Book

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Apr 28, 2021, 8:55:21 PMApr 28
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You have to add the path that contains the Methods directory, not the Methods directory itself.

If it's deployed relative to your script, consider adding it like in this example: https://metacpan.org/pod/Mojolicious::Guides::Growing#Script

    # add directory script is in
    use lib curfile->dirname->to_string;

-Dan

llaro...@gmail.com

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Apr 29, 2021, 9:45:05 AMApr 29
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Thanks, I'll give it a try today ! Looks like FindBin but Mojolicious' way

llaro...@gmail.com

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Apr 29, 2021, 1:55:16 PMApr 29
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"curfile" is not exported by the Mojo::File module

should I update Mojolicious ?

Dan Book

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Apr 29, 2021, 2:00:30 PMApr 29
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Dmitry L.

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Apr 29, 2021, 2:26:01 PMApr 29
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Here is my Service with perlbrew
[Service]
Type=forking
User=backend
Group=backend
WorkingDirectory=/home/backend/app
Environment=PERLBREW_ROOT=/home/backend/perl5/perlbrew
ExecStart=/home/backend/perl5/perlbrew/bin/perlbrew exec -q --with
perl-5.28.0 hypnotoad /home/backend/app/app_backend.pl
...


Here is perlbrew info:
$ > perlbrew info
Current perl:
Name: perl-5.28.0
Path: /home/backend/perl5/perlbrew/perls/perl-5.28.0/bin/perl
Config: -de -Dprefix=/home/backend/perl5/perlbrew/perls/perl-5.28.0
-Aeval:scriptdir=/home/backend/perl5/perlbrew/perls/perl-5.28.0/bin
Compiled at: Jul 8 2018 23:47:31

perlbrew:
version: 0.84
ENV:
PERLBREW_ROOT: /home/backend/perl5/perlbrew
PERLBREW_HOME: /home/backend/.perlbrew
PERLBREW_PATH:
/home/backend/perl5/perlbrew/bin:/home/backend/perl5/perlbrew/perls/perl-5.28.0/bin
PERLBREW_MANPATH: /home/backend/perl5/perlbrew/perls/perl-5.28.0/man
//wbr, Dmitry L.

llaro...@gmail.com

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Apr 30, 2021, 10:50:21 AMApr 30
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Thanks to both of you, I managed to get past loading modules while starting the service from systemd. Now there is another bug regarding relative paths and I wonder how to solve it, it seems lib::relative might not do the trick

my $homedir = $ENV{'HOME'};
my $cwd = $ENV{'PWD'};
my $log = Mojo::Log->new(path => $cwd . '/log/ccdapi.log', level => 'info');

Use of uninitialized value $cwd in concatenation (.) or string at /srv/ccdapi/VM01/PROD/v1/ccdapi.pl line 21.
Apr 29 16:16:19 vl-vm-sr824.lb ccdapi[65656]: Can't load application from file "/srv/ccdapi/VM01/PROD/v1/ccdapi.pl": Can't open file "/log/ccdapi.log": No such file or directory at /srv/ccdapi/.perlbrew/libs/perl-5.24.0@ccd
Apr 29 16:16:19 vl-vm-sr824.lb ccdapi[65656]: Compilation failed in require at (eval 81) line 1.

Cheers !

Dan Book

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Apr 30, 2021, 11:11:45 AMApr 30
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The current working directory in Perl should be retrieved using Cwd, not $ENV{PWD}. Regardless, putting paths in your program based on CWD is a bug, since the program could be run with any CWD and that should not change its behavior. I wrote a similar module to the FindBin interface using the same method as lib::relative for creating arbitrary file paths relative to the current file: https://metacpan.org/pod/Path::This

With an up to date Mojolicious, curfile can of course solve both these problems.

-Dan

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