Overview

This pull request introduces support for dependencies across sources, conditions, and targets, making the dependency model more flexible.
Current Behavior:

• Sources can depends on:
  • Other sources
• Conditions can depends on:
  • Other conditions
  • One source (by sourceID)
• Targets can depend on:
  • Other targets
  • Either:
    • All conditions
    • A subset of conditions
  • One source (by sourceID)

New Behavior:

With this change, sources, conditions, and targets can depend on any other resource type. This is a stepping stone towards resolving issues like issue #2718 and issue #159.

Implementation

To achieve this, I've extended the current dependsOn specification. It can now be defined using the format:

(resourceType#)resourceId(:booleanOperator)

This change allows merging the three resource-specific dependency Directed Acyclic Graphs (DAGs) into a single unified DAG. The DAG is built using a custom node type:

type Dependency struct {
    ID       string
    Operator string
}

type Node struct {
    ID                string
    Category          string
    DependsOn         []Dependency
    DependsOnChange   bool
    Result            string
    Changed           bool
}

To ensure backward compatibility, the existing dependencies (i.e., DependsOn) are preserved. In addition, the sourceID is passed as a dependency for conditions and targets, and conditionIDs are fed into the targets as dependencies in the DAG.

A traversal of the DAG using DescendantsFlow processes each resource in the correct order once its dependencies are completed.

Expected Impact

This PR is expected to be a no-op, meaning that while the core pipeline logic has been updated, there should be no impact on the output or behavior of existing pipelines.

updatecli manifest show -graph

In order to help debugging the dependencies tree,

I' ve added an option to the show command to display the DAG in graphviz format, this allows to get interesting information on a pipeline:

• e2e/updatecli.d/success.d/temurin/sources.yaml:
  
• e2e/updatecli.d/success.d/chained.yaml:
  
• e2e/updatecli.d/success.d/http.yaml: