Receives an apt key from the given keyserver.

Adds an apt repo (and optionally a key from the given keyserver).

Ensure the given packages are installed. Can take a flat collection of packages, passed as symbols, strings, or keywords, or, alternatively, a map of packages to version strings. Can optionally take a collection of additional CLI options to be passed to apt-get.

Installs an openjdk jdk11 via stretch-backports.

Given a list of debian packages (strings, symbols, keywords, etc), returns the set of packages which are installed, as strings.

Given a package name, determines the installed version of that package, or nil if it is not installed.

Are the given debian packages, or singular package, installed on the current system?

Apt-get update if we haven’t done so recently.

Prevents running apt operations concurrently on the same node.

An implementation of the Debian OS.

Makes sure the hostfile has a loopback entry for the local hostname

When did we last run an apt-get update, in seconds ago

Removes a package or packages.

Apt-get update.