Verify MERRA2 location; ensure correct WEMIN setting for remapping from MERRA-2 and GEOS-IT

[weiyuan-jiang]

Verify availability of discover:/archive directory with MERRA2 restarts. Help users by printing error message with information about Discover nodes from which this directory can be accessed.
Ensure correct WEMIN setting for remapping from MERRA-2 and GEOS-IT

Related PRs:
GEOS-ESM/GEOSldas_GridComp#166

[gmao-rreichle]

@weiyuan-jiang @mathomp4 @sdrabenh :
When working on this PR, I noticed that #174 (started by Matt in January and merged by Scott last week) removed help text that remapping from GEOS-IT and M-2 only works on Discover. See changes in lines ~80-90 of remap_questions.py.
I don't know if this was intentional or not, but for now I edited the "message" text to add the caveat about "discover only", including the bit about discover[30,36] for M-2 restarts, see f40b6e3
Two questions:

1. I can't tell if the aforementioned change in v11: Ask GEOS-IT question first, look for MERRA-2 #174 was intentional or inadvertent. If it was intentional, I would advised against it.
2. If the change was inadvertent and some mix-up of "v11" and "v12" branches, somebody should look at v11: Ask GEOS-IT question first, look for MERRA-2 #174 again to make sure nothing else got lost in the shuffle. I see a bunch of changes that appear to be related to cleaning up or strengthening the python coding. For example, "x.get()" vs. "x[]" and the use or not of "False" in remap_questions.py.

Note that the "discover only" information for remapping from GEOS-IT and M-2 also got lost in the corresponding v12 PR #173.

For now, I changed the present PR to draft to express that it needs further scrutiny.

Please coordinate with @biljanaorescanin regarding running the remap_restarts test suite and making sure the remapping from M-2 works as intended on and off discover[30,36].

[biljanaorescanin]

Testing Summary

1. All remapping tests passed successfully.

2. Functionality Testing:

On discover32:
The MERRA-2 (M2) prompt is not shown, as expected.

? Remap from archived GEOS-IT restarts? (Works only on NCCS/Discover.)
No
? Enter input directory with restart files to be remapped:

On discover36:
The MERRA-2 (M2) prompt is shown, as expected for supported nodes.

? Remap from archived GEOS-IT restarts? (Works only on NCCS/Discover.)
No
? Remap from archived MERRA-2 restarts? (Works only on NCCS/Discover nodes

And all other questions and final results worked as expected.

[gmao-rreichle]

@biljanaorescanin : It looks like you tested the interactive questions for remap_restarts directly. Did you try specifying RESTART='M' in GEOSldas and verify that setup exits with a useful error message? Not sure I understand your test summary correctly

[sdrabenh]

@gmao-rreichle sorry I missed seeing your last comment before I merged. Do we need to revert?

[gmao-rreichle]

@gmao-rreichle sorry I missed seeing your last comment before I merged. Do we need to revert?

@sdrabenh : No worries. Let's wait for @biljanaorescanin to respond. It's probably all good. If we need to make changes, we can just start a new PR. Even if the current PR has flaws, it shouldn't be a problem to keep "main" as is in the meantime

[biljanaorescanin]

@gmao-rreichle I planned to leave that comment on GEOSldas_GridComp PR#166 once all regression tests are done...

Yes, option "M" in GEOSldas was tested an all looked good.

That was done before I left comment on this PR.

[gmao-rreichle]

Thanks, @biljanaorescanin! @sdrabenh : No need to revert, then.

[sdrabenh]

Great!