[ET Trac] #2731: check for incomplete perl install when use requests parallel checkout

[Roland Haas]

#2731: check for incomplete perl install when use requests parallel checkout

 Reporter: Roland Haas
   Status: new
Milestone: 
  Version: 
     Type: bug
 Priority: minor
Component: GetComponents

**Panagiotis Iosif** in [https://lists.einsteintoolkit.org/pipermail/users/2023-May/008923.html](https://lists.einsteintoolkit.org/pipermail/users/2023-May/008923.html) encountered and issue when passed `--parallel` to GetComponents on a cluster where the Perl installation is very minimal and lacks Perl’s standard Thread package. This has happened before in some Docker image as well \(so that now we include Perl as one of the packages to install with apt/yum/dnf\). 

Since this is apparently also an issue on clusters, pull request 

[https://github.com/gridaphobe/CRL/pull/13](https://github.com/gridaphobe/CRL/pull/13)

provides an error message when this happens. Leaving out the explicit `--parallel` option lets one download the ET.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2731/check-for-incomplete-perl-install-when-use
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