Debian mirror dependency filter: How to include dependencies of packages from 3rd party repository?

[vrzh]

Aptly is a great project, really enjoying using it! But, still very new to how it works.

Suppose I have a very basic aptly mirror M of Debian packages where I use filters to reduce the number of downloaded packages.

Then I have a package P which I get from a 3rd party repository. Is it possible to add all the dependencies of P in some automated way to the filter of M?

The closest I found in the docs is the backports example https://www.aptly.info/tutorial/pull/#backporting-nginx but there the setup is a bit different.

As a concrete example, see the list of commands below. I create a Debian mirror with almost no packages in it. Then I have another mirror from which I get the google-chrome-stable package. When I publish a merged snapshot, I want to be able to fully install google-chrome-stable with all of its dependencies.

# Create a basic Debian mirror.
aptly mirror create -architectures=amd64 -filter='Priority (required) | Priority (important) | Priority (standard)' -filter-with-deps my-mirror-debian http://free.hands.com/debian/ trixie main

# Create a basic Google Chrome mirror.
aptly mirror create -architectures=amd64 -filter='google-chrome-stable' -filter-with-deps my-mirror-chrome http://dl.google.com/linux/chrome/deb/ stable

# Download Debian packages.
aptly mirror update my-mirror-debian

# Download Google Chrome package.
aptly mirror update my-mirror-chrome

# (workaround) Get the dependencies or Google Chrome (is there a json output option?).
aptly package show google-chrome-stable

...
Depends: ca-certificates, fonts-liberation, libasound2 (>= 1.0.17), libatk-bridge2.0-0 (>= 2.5.3), libatk1.0-0 (>= 2.11.90), libatspi2.0-0 (>= 2.9.90), libc6 (>= 2.25), libcairo2 (>= 1.6.0), libcups2 (>= 1.6.0), libcurl3-gnutls | libcurl3-nss | libcurl4 | libcurl3, libdbus-1-3 (>= 1.9.14), libexpat1 (>= 2.1~beta3), libgbm1 (>= 17.1.0~rc2), libglib2.0-0 (>= 2.39.4), libgtk-3-0 (>= 3.9.10) | libgtk-4-1, libnspr4 (>= 2:4.9-2~), libnss3 (>= 2:3.35), libpango-1.0-0 (>= 1.14.0), libudev1 (>= 183), libvulkan1, libx11-6 (>= 2:1.4.99.1), libxcb1 (>= 1.9.2), libxcomposite1 (>= 1:0.4.4-1), libxdamage1 (>= 1:1.1), libxext6, libxfixes3, libxkbcommon0 (>= 0.5.0), libxrandr2, wget, xdg-utils (>= 1.0.2)
...

# Edit the original mirror to include these packages.
aptly mirror edit -filter='Priority (required) | Priority (important) | Priority (standard) | ca-certificates | fonts-liberation | libasound2 | libatk-bridge2.0-0 | libatk1.0-0 | libatspi2.0-0 | libc6 | libcairo2 | libcups2 | libcurl3-gnutls | libcurl3-nss | libcurl4 | libcurl3 | libdbus-1-3 | libexpat1 | libgbm1 | libglib2.0-0 | libgtk-3-0 | libgtk-4-1 | libnspr4 | libnss3 | libpango-1.0-0 | libudev1 | libvulkan1 | libx11-6 | libxcb1 | libxcomposite1 | libxdamage1 | libxext6 | libxfixes3 | libxkbcommon0 | libxrandr2 | wget | xdg-utils' -filter-with-deps my-mirror-debian

# Download the dependencies for Google Chrome.
aptly mirror update my-mirror-debian

# Other usual commands (snapshots, merging, publishing, serving).