Installing Pythia8

Hi,

Your issue is a certificate issue.

> curl performs SSL certificate verification by default, using a "bundle"
> of Certificate Authority (CA) public keys (CA certs). If the default
> bundle file isn't adequate, you can specify an alternate file
> using the --cacert option.
> If this HTTPS server uses a certificate signed by a CA represented in
> the bundle, the certificate verification probably failed due to a
> problem with the certificate (it might be expired, or the name might
> not match the domain name in the URL).

I guess that the issue is that your curl version is not up-to-date and does not recognize the certificate used
by the pythia8 server. But I may be wrong.

Cheers,

Olivier

> On 21 Apr 2022, at 04:55, Shelley Tong <email address hidden> wrote:
>
> New question #701447 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/701447
>
> Hey there! I tried to install Pythia8 from Madgraph, but when I ran the command >install pythia8, the following message showed up:
>
> You are installing 'pythia8', please cite ref(s): arXiv:1410.3012.
> Downloading the HEPToolInstaller at:
> http://madgraph.physics.illinois.edu/Downloads/HEPToolsInstaller/HEPToolsInstaller_V167.tar.gz
> LHAPDF was not found. Do you want to install LHPADF6? (recommended) y/n >[y] [60s to answer]
>> n
> You decided not to link the Pythia8 installation to LHAPDF. Beware that only built-in PDF sets can be used then.
> Now installing Pythia8. Be patient...
> /Users/mac/MadLabFolder/MG5_aMC_v3_3_2/HEPTools/HEPToolsInstallers/HEPToolInstaller.py:510: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
> _mg5_version = LooseVersion(line[9:].strip())
> /Users/mac/MadLabFolder/MG5_aMC_v3_3_2/HEPTools/HEPToolsInstallers/HEPToolInstaller.py:456: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
> if tool_name in ['lhapdf6', 'lhapdf'] and MG5_version and MG5_version < LooseVersion("2.6.1"):
> /Users/mac/MadLabFolder/MG5_aMC_v3_3_2/HEPTools/HEPToolsInstallers/HEPToolInstaller.py:255: DeprecationWarning: distutils Version classes are deprecated. Use packaging.version instead.
> ( lambda MG5version: MG5version < LooseVersion("2.6.1"),
> Optional 'pythia8' dependency 'lhapdf6' is disabled and will not be available.
> Fetching data with command:
> curl -OL https://pythia.org/download/pythia83/pythia8306.tgz
> % Total % Received % Xferd Average Speed Time Time Time Current
> Dload Upload Total Spent Left Speed
> 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
> curl: (60) SSL certificate problem: certificate has expired
> More details here: https://curl.haxx.se/docs/sslcerts.html
>
> curl performs SSL certificate verification by default, using a "bundle"
> of Certificate Authority (CA) public keys (CA certs). If the default
> bundle file isn't adequate, you can specify an alternate file
> using the --cacert option.
> If this HTTPS server uses a certificate signed by a CA represented in
> the bundle, the certificate verification probably failed due to a
> problem with the certificate (it might be expired, or the name might
> not match the domain name in the URL).
> If you'd like to turn off curl's verification of the certificate, use
> the -k (or --insecure) option.
> HTTPS-proxy has similar options --proxy-cacert and --proxy-insecure.
> Could not download data at 'https://pythia.org/download/pythia83/pythia8306.tgz' because of:
> stat: path should be string, bytes, os.PathLike or integer, not NoneType
>
> Command "install pythia8" interrupted with error:
> InvalidCmd : Installation of pythia8 failed.
>
> What does " path should be string, bytes, os.PathLike or integer, not NoneType" mean?
>
> Thanks!
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi,

I'm also encountering this issue. My computer is unable to update curl, but I believe that calling "curl -k" will ignore the certification from the server. Is there a way to modify the Madgraph code to use "curl -k" (e.g. in a file in the madgraph/various/ directory)?

Thanks,
- Matt

you have to do in the directory above madgraph
bzr branch lp:~maddevelopers/mg5amcnlo/HEPToolsInstallers <https://code.launchpad.net/~maddevelopers/mg5amcnlo/HEPToolsInstallers>

then you can edit the file HEPToolsInstallers/HEPToolsInstallers.py
around line 1267
       if sys.platform == "darwin":
          program = ["curl","-OL"]
then you can go back to madgraph
and instead of doing
install pythia8
you can do
install pythia8 --local

then you should see the lines
"you are using a local installer. This is intended for debugging only!"
that state that you are indeed using the local version of the Heptoolsinstaller suite and not the version online.

Cheers,

Olivier

> On 17 Jun 2022, at 21:15, Matthew Low <email address hidden> wrote:
>
> Question #701447 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/701447
>
> Matthew Low requested more information:
> Hi,
>
> I'm also encountering this issue. My computer is unable to update
> curl, but I believe that calling "curl -k" will ignore the certification
> from the server. Is there a way to modify the Madgraph code to use
> "curl -k" (e.g. in a file in the madgraph/various/ directory)?
>
> Thanks,
> - Matt
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.