Custom PyPI Index Configuration in PDM

[berthin]

Hi,

I'm trying to understand the correct way to configure a custom PyPI index in a PDM-managed project.

Initially, I added the index to my pyproject.toml like this:

[[tool.pdm.source]]
name = "pypi-simple"
url = "https://my-server.com/pypi/simple"
verify_ssl = true
ca_certs = "/path/to/cert.pem"

However, when I run pdm add package, I get [ConnectError]: [Errno 99] Cannot assign requested address.

Then, if I instead create a pdm.toml file with the following:

[pypi]
url = "https://my-server.com/pypi/simple"
ca_certs = "/path/to/cert.pem"

... everything works file.

This has left me confused about the correct usage. I expected that defining sources in pyproject.toml would be sufficient for PDM to use the custom index when installing packages. Also, unlike Poetry, the pdm.lock file doesn’t seem to indicate which index a package was pulled from.

Could you clarify:

• What is the correct and recommended way to configure a custom PyPI index in PDM?
• Why does the pyproject.toml approach not work as expected?
• Is there a way to confirm (e.g. pdm.lock?) which source a package came from? In case of having multiple indexes.

The poetry.lock file looks like:

[package.source]
type = "legacy"
url = "https://my-server.com/pypi/simple"
reference = "pypi-simple"

[[package]]
name = "certifi"
...

So, it's clear where the package comes from.

Thanks

[ShreeChaturvedi]

Change the source name to pypi to replace the default index. With pypi-simple, pdm add still talks to pypi.org, and that's the ConnectError you're seeing.

[[tool.pdm.source]]
name = "pypi"
url = "https://my-server.com/pypi/simple"
verify_ssl = true

Leave the cert path out of pyproject.toml so it isn't in git. pdm config pypi.ca_certs /path/to/cert.pem writes it globally, and the pdm.toml you already have works the same way.

PDM doesn't record the source name the way Poetry does. pdm lock -S static_urls puts the download URL on each files row in pdm.lock.