How to download source rpm using the python binding?

[nezen]

I'm trying to use the python binding to download source rpm packages but didn't figure it out.
Also is there a way to only build the package dependencies and the package without installing it?
I can use the following commands to get the outputs I want, but any equivalent python binding can replicate the same behavior?
dnf5 download
dnf5 builddep
rpmbuild

Thanks.

[pkratoch]

Hi, to download source rpm packages, you can do something like this:

import libdnf5

# Create dnf base
base = libdnf5.base.Base()
base.setup()

# Load repositories configured on the system
repo_sack = base.get_repo_sack()
repo_sack.create_repos_from_system_configuration()
repo_sack.enable_source_repos()
repo_sack.load_repos()

# Create a package query
query = libdnf5.rpm.PackageQuery(base)
# Filter only available source packages
query.filter_available()
query.filter_arch("src")
# Filter anything else, this is just an example
query.filter_nevra("htop*", libdnf5.common.QueryCmp_GLOB)

# Create a downloader, add all the packages from the query to given destination and download
downloader = libdnf5.repo.PackageDownloader(base)
for pkg in query:
    downloader.add(pkg, "/tmp/my_destdir/")
downloader.download()

As for your second question, I don't think there is any feature in dnf related to building packages, but maybe rpm provides an API, so I would suggest to ask there - https://github.com/rpm-software-management/rpm/discussions

[nezen]

Hi @pkratoch thank you for your swift response. this is exactly what I was looking for.
yesterday i looked into download.cpp and found some useful code. so the key is enable_source_repos()
and i guess you are right dnf probably relies on the rpm lib to perform package building task.
again thanks for the help!