[ET Trac] [Einstein Toolkit] #369: Add command to update thorn list

[Einstein Toolkit]

#369: Add command to update thorn list
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 Reporter:  eschnett       |       Owner:  eric9
     Type:  defect         |      Status:  new  
 Priority:  minor          |   Milestone:       
Component:  GetComponents  |     Version:       
 Keywords:                 |  
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 When the thorn list changes, then I have to run GetComponents --update
 twice: first to update the thorn list, and then to actually check out
 these thorns. Currently, I have to update all thorns twice, which is a
 waste of time.

 Ideally, GetComponents would first update the thorn list, then update
 itself, then update everything else, and thus perform three passes over
 the thorn list, but not perform the work three times. Can we achieve this
 somehow? For example, we could mark the CRL script and the thorn lists
 with special tags, and GetComponents would then perform the work in three
 stages, restarting in between.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/369>
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