pk4 resolves the specified argument(s) as either:
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1. the name of a Debian binary package, and selects its Debian source package.
2. the name of a Debian source package, and selects it.
3. or a file path, and selects the Debian source package of the owning package.
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The source package version is either the installed version (if any) or the
installation candidate, as per “apt-cache policy”.
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Then, pk4 downloads the entire selected source package (every file referenced
by — and including — its .dsc file) and prints the output directory path.
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pk4…
• caps the disk usage of the checked out packages by deleting the oldest ones
after crossing a limit (default: 2GiB).
• allows users to enable supplied or shipped-with-pk4 hooks, e.g. git-init.
• optimizes for low latency of each operation.
• respects your APT configuration, i.e. should work in company intranets.
• comes with tab completion for bash and zsh.
• tries hard to download source packages, with fallback to snapshot.debian.org.
