Rme/cesm pop 2 1 20240202

[jedwards4b]

Description of changes:

This change removes the manage_externals utility and replaces it with git-fleximod. None of the extended features of git-fleximod are used here so one can just use git-submodule instead. This allows POP to be used as part of the upcoming cesm2_3_beta18 tag which removes the manage_externals utility in cesm and moves to git-fleximod.

Testing:

Test case/suite:
Test status: bit for bit

Fixes [POP2 Github issue #]

User interface (namelist or namelist defaults) changes?

[mnlevy1981]

This all looks great, but I'm a little confused about why it works... I did the following:

$ git clone -b remove_manage_externals https://github.com/jedwards4b/POP2-CESM.git POP_rme
$ cd POP_rme/
$ git submodule update --init
$ cd externals/MARBL/
$ git log --decorate | head -n 1
commit 75827e20f40b29a30361aff4eae9801f1036a916 (HEAD, tag: marbl0.43.0)

So it clearly checked out marbl0.43.0, which is the branch of MARBL we want POP to use, but the head of the default branch is 6b2a5e4 (marbl0.39.1). The only reference to a commit I see in .gitmodules is fxtag, which presumably requires fleximod to parse... so how did git know what commit to checkout?

[mnlevy1981]

ugh, it looks like I actually tested the branch from #80 (had both tabs open); let me close that PR in favor of this one and try again.

[mnlevy1981]

Okay, I removed the POP_rme directory and tried again:

$ git clone -b rme/cesm_pop_2_1_20240202 https://github.com/jedwards4b/POP2-CESM.git POP_rme --recurse-submodules
Cloning into 'POP_rme'...
remote: Enumerating objects: 13179, done.
remote: Counting objects: 100% (523/523), done.
remote: Compressing objects: 100% (268/268), done.
remote: Total 13179 (delta 264), reused 473 (delta 251), pack-reused 12656
Receiving objects: 100% (13179/13179), 7.16 MiB | 13.85 MiB/s, done.
Resolving deltas: 100% (9491/9491), done.
Submodule 'CVMix' (https://github.com/CVMix/CVMix-src) registered for path 'externals/CVMix'
Submodule 'MARBL' (https://github.com/marbl-ecosys/MARBL) registered for path 'externals/MARBL'
Cloning into '/Users/mlevy/temp/POP_rme/externals/CVMix'...
remote: Enumerating objects: 3334, done.
remote: Counting objects: 100% (10/10), done.
remote: Compressing objects: 100% (8/8), done.
remote: Total 3334 (delta 2), reused 9 (delta 2), pack-reused 3324
Receiving objects: 100% (3334/3334), 5.15 MiB | 13.87 MiB/s, done.
Resolving deltas: 100% (2399/2399), done.
Cloning into '/Users/mlevy/temp/POP_rme/externals/MARBL'...
remote: Enumerating objects: 9808, done.
remote: Counting objects: 100% (1710/1710), done.
remote: Compressing objects: 100% (454/454), done.
remote: Total 9808 (delta 1314), reused 1609 (delta 1241), pack-reused 8098
Receiving objects: 100% (9808/9808), 4.79 MiB | 12.24 MiB/s, done.
Resolving deltas: 100% (7441/7441), done.
Submodule path 'externals/CVMix': checked out '9423197f894112edfcb1502245f7d7b873d551f9'
Submodule path 'externals/MARBL': checked out '75827e20f40b29a30361aff4eae9801f1036a916'

From the last line, you can see it's still checking out the correct MARBL tag (and I'm still curious about how it knows)