MueLu: File named "aux" prevents successful Trilinos clone on Windows

[dc-snl]

Bug Report

@trilinos/MueLu

Description

There's a file named aux in the MueLu source tree, causing this issue when cloning on Windows:

C:\TEMP>git clone https://github.com/trilinos/Trilinos.git source/Trilinos
Cloning into 'source/Trilinos'...
remote: Enumerating objects: 1219101, done.
remote: Counting objects: 100% (32/32), done.
remote: Compressing objects: 100% (30/30), done.
remote: Total 1219101 (delta 7), reused 13 (delta 2), pack-reused 1219069Receiving objects: 100% (1219101/1219101), 741.
Receiving objects: 100% (1219101/1219101), 745.12 MiB | 8.50 MiB/s, done.

Resolving deltas: 100% (924098/924098), done.
error: invalid path 'packages/muelu/research/caglusa/1d-binary-global/aux'
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

See also: https://stackoverflow.com/questions/61614004/cloning-succeded-but-checkout-failed-due-to-invalid-path-what-is-the-path-probl

The problem is Windows

Windows cannot handle any file named AUX. You can't name a file PRN or CON or COM1 either.

According to the linked article,

Microsoft provides an official list of reserved file names, and here they are:

CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9

Note that you can’t use these file names with any file extension. So you can’t name a file “con.txt”, “con.jpg”, “or “con.doc”. And Windows isn’t case sensitive, so it doesn’t matter whether it’s CON, con, or CoN—Windows won’t let you use that name.

Steps to Reproduce

1. SHA1: ff31d99
2. Simply try to clone on Windows.

[dc-snl]

I should note that there are other files with aux at the beginning of their file name that seem to cause this issue:

C:\TEMP\source\Trilinos>git checkout 94795d780d8908bb96b60b66d08e2cd59dba2fd5
error: invalid path 'packages/muelu/research/caglusa/1d-binary-global/aux'
error: invalid path 'packages/muelu/research/caglusa/1d-binary-local/aux.4.0'
error: invalid path 'packages/muelu/research/caglusa/1d-binary-local/aux.4.1'
error: invalid path 'packages/muelu/research/caglusa/1d-binary-local/aux.4.2'
error: invalid path 'packages/muelu/research/caglusa/1d-binary-local/aux.4.3'
error: invalid path 'packages/muelu/research/caglusa/1d-mm-global/aux'
error: invalid path 'packages/muelu/research/caglusa/1d-mm-local/aux.4.0'
error: invalid path 'packages/muelu/research/caglusa/1d-mm-local/aux.4.1'
error: invalid path 'packages/muelu/research/caglusa/1d-mm-local/aux.4.2'
error: invalid path 'packages/muelu/research/caglusa/1d-mm-local/aux.4.3'
error: invalid path 'packages/muelu/research/caglusa/aux.xml'

[cgcgcg]

Fixed on develop.