[ruby-core:107792] [Ruby master Bug#18614] Error (busy loop) inTestGemCommandsSetupCommand#test_destdir_flag_does_not_try_to_write_to_the_default_gem_home

Issue #18614 has been updated by duerst (Martin D端rst).


Some additional information: The permissions in the related directories are as follows (from a different test run):
```
duerst@Kloentalersee:~/14ruby/tmp/test_rubygems_20220308-13015-dxrmg4/gemhome$ ls -la
total 36
drwxrwxr-x 9 duerst duerst 4096 Mar  8 16:24 .
drwx------ 9 duerst duerst 4096 Mar  8 16:24 ..
drwxrwxr-x 2 duerst duerst 4096 Mar  8 16:24 build_info
drwxrwxr-x 2 duerst duerst 4096 Mar  8 16:24 cache
drwxrwxr-x 3 duerst duerst 4096 Mar  8 16:24 doc
drwxrwxr-x 2 duerst duerst 4096 Mar  8 16:24 extensions
drwxrwxr-x 5 duerst duerst 4096 Mar  8 16:24 gems
dr-xr-xr-x 2 duerst duerst 4096 Mar  8 16:24 plugins
drwxrwxr-x 3 duerst duerst 4096 Mar  8 16:24 specifications
```
There's definitely a 'w' missing on the plugins directory, but it's unclear why just this one directory should have lower permissions than the rest.

----------------------------------------
Bug #18614: Error (busy loop) in TestGemCommandsSetupCommand#test_destdir_flag_does_not_try_to_write_to_the_default_gem_home
https://bugs.ruby-lang.org/issues/18614#change-96716

* Author: duerst (Martin D端rst)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.0dev (2021-06-03T06:59:33Z master 7e14762159) [x86_64-linux]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
When running `make check`, I get a busy loop in
`TestGemCommandsSetupCommand#test_destdir_flag_does_not_try_to_write_to_the_default_gem_home`
every time I try. When excluding this test
(by changing the method name to `_test_destdir_flag_does_not_try_to_write_to_the_default_gem_home`),
things work as usual (17 errors related to `TestNetHTTPS`/`TestNetHTTPLocalBind`).
The relevant file is `test/rubygems/test_gem_commands_setup_command.rb`. When running only that file,
I get two failures and two errors. One of the errors says
```
TestGemCommandsSetupCommand#test_destdir_flag_does_not_try_to_write_to_th
  1) Error:
TestGemCommandsSetupCommand#test_destdir_flag_does_not_try_to_write_to_the_default_gem_home:
Gem::FilePermissionError: You don't have write permissions for the /home/duerst/14ruby/tmp/test_rubygems_20220308-18434-8gq4j4/gemhome/plugins directory.
```
This is on Windows 10/WSL/Ubuntu 20.04.





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