* Shells like zsh have glob qualifiers that will error if an extra
is not quoted. While the glob qualifiers can be disabled, adding
quotes guards against errors if people are copy-pasting or do not
know that they can disable the behavior.
* Use single quotes for Linux/Mac and use double quotes for Windows
to follow existing style conventions.
This tremendously helps understand why a package is being fetched and
can help investigate and fix dependency resolver backtracking issues
when incoherent constraints/package sets are provided or when new
versions of a package trigger a completely different backtracking
strategy, leading to very hard to debug situations.
Use the same code to determine isolated environment paths at
dependency install time and at environment setup time. We do not care
about the exact paths but the paths needs to be consistent at package
installation time and environment setup.
This should fix issues observed on platforms that customize the
installation schemes, such as Debian and Homebrew, where dependency
installation and isolated build environment setup resolved to
different paths.
The PEP 668 expects an override mechanism to ease the transition.
This provides an override.
---------
Co-authored-by: Pradyun Gedam <pradyunsg@gmail.com>
Refactored `_get_index_url()` to get integration tests for the subprocess backend working.
Keyring support via the 'subprocess' provider can only retrieve a password, not a username-password combo. The username therefor MUST come from the URL.
If the URL obtained from the index does not contain a username then the username from a matching index is used. `_get_index_url()` does that matching.
The problem this refactoring solves is that the URL where a wheel or sdist can be downloaded from does not always start with the index url. Azure DevOps Artifacts Feeds are an example since it replaces the friendly name of the Feed with the GUID of the Feed. Causing `url.startswith(prefix)` to evaluate as `False`.
The new behaviour is to return the index which matches the netloc and has the longest common prefix of the `path` property of the value returned by `urllib.parse.urlsplit()`. The behaviour for resolving ties is unspecified.
