• Poetry version: 1.5.0
• Python version:3.10.6
• OS version and name: Ubuntu 22.04.2 LTS
• pyproject.toml: https://gist.github.com/shiumachi/01ce37f527818e513f18ece4b3a01ecc

• I am on the latest stable Poetry version, installed using a recommended method.
• I have searched the issues of this repo and believe that this is not a duplicate.
• I have consulted the FAQ and blog for any relevant entries or release notes.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option) and have included the output below.

Issue

I have encountered an issue while using the poetry export command when specifying an explicit source. The command does not seem to export the --extra-index-url and --trusted-host as expected. This affects projects relying on these sources and may require manual adjustments in the generated requirements file.

To reproduce the issue, please follow these steps:

Reproduction Steps
Set up the environment with Poetry 1.5 and a local pypiserver running on port 8080 with a wheel file (in this example, a black wheel file) placed in the packages directory.
Run the command poetry export --without-hashes.

Actual Output

black==23.3.0 ; python_version >= "3.10" and python_version < "4.0"
click==8.1.3 ; python_version >= "3.10" and python_version < "4.0"
colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"
mypy-extensions==1.0.0 ; python_version >= "3.10" and python_version < "4.0"
packaging==23.1 ; python_version >= "3.10" and python_version < "4.0"
pathspec==0.11.1 ; python_version >= "3.10" and python_version < "4.0"
platformdirs==3.5.1 ; python_version >= "3.10" and python_version < "4.0"
tomli==2.0.1 ; python_version >= "3.10" and python_version < "3.11"

Expected Output

--trusted-host localhost:8080
--extra-index-url http://localhost:8080

black==23.3.0 ; python_version >= "3.10" and python_version < "4.0"
click==8.1.3 ; python_version >= "3.10" and python_version < "4.0"
colorama==0.4.6 ; python_version >= "3.10" and python_version < "4.0" and platform_system == "Windows"
mypy-extensions==1.0.0 ; python_version >= "3.10" and python_version < "4.0"
packaging==23.1 ; python_version >= "3.10" and python_version < "4.0"
pathspec==0.11.1 ; python_version >= "3.10" and python_version < "4.0"
platformdirs==3.5.1 ; python_version >= "3.10" and python_version < "4.0"
tomli==2.0.1

Investigation

Upon investigating the issue, I found that in the poetry-plugin-export, the Exporter class calls the RepositoryPool.repositories property from the main poetry repository to fetch all repository information:

repositories = [
    r
    for r in self._poetry.pool.repositories
    if isinstance(r, HTTPRepository) and r.url == index.rstrip("/")
]

(Source: https://github.com/python-poetry/poetry-plugin-export/blob/main/src/poetry_plugin_export/exporter.py#L174-L178)

However, in poetry 1.5.0, the repositories property excludes the explicit repository for the sake of backward compatibility:

@property
def repositories(self) -> list[Repository]:
    """
    Returns the repositories in the pool,
    in the order they will be searched for packages.

    ATTENTION: For backwards compatibility and practical reasons,
               repositories with priority EXPLICIT are NOT included,
               because they will not be searched.
    """
    sorted_repositories = self._sorted_repositories
    return [
        prio_repo.repository
        for prio_repo in sorted_repositories
        if prio_repo.priority is not Priority.EXPLICIT
    ]

(Source: https://github.com/python-poetry/poetry/blob/master/src/poetry/repositories/repository_pool.py#L62-L77)

Possible Solution

One possible solution would be to use the all_repositories property instead of repositories:

@property
def all_repositories(self) -> list[Repository]:
    return [prio_repo.repository for prio_repo in self._sorted_repositories]

(Source: https://github.com/python-poetry/poetry/blob/master/src/poetry/repositories/repository_pool.py#L79-L81)

To maintain compatibility and flexibility for users who may not want to include the explicit repository, another approach could be to add an --with-explicit-repository option to the poetry export command.

I've been examining this issue closely and I'd like to take the next step by working on a pull request to solve it. I believe the potential solutions we discussed above are a good starting point, though I haven't started writing the code just yet.

I'm open to any additional guidance or suggestions before I start with the implementation. Once I have written the code and ensured it doesn't disrupt existing functionality or introduce new security concerns, I'll submit the pull request.

I appreciate your support and I'm looking forward to contributing to the resolution of this issue.