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ce49dd6080
When you specify `-verbose` you'll get the whole graph of operations,
which gives a better idea of the operations terraform performs and in
what order.
The DOT graph is now generated with a small internal library instead of
simple string building. This allows us to ensure the graph generation is
as consistent as possible, among other benefits.
We set `newrank = true` in the graph, which I've found does just as good
a job organizing things visually as manually attempting to rank the nodes
based on depth.
This also fixes `-module-depth`, which was broken post-AST refector.
Modules are now expanded into subgraphs with labels and borders. We
have yet to regain the plan graphing functionality, so I removed that
from the docs for now.
Finally, if `-draw-cycles` is added, extra colored edges will be drawn
to indicate the path of any cycles detected in the graph.
A notable implementation change included here is that
{Reverse,}DepthFirstWalk has been made deterministic. (Before it was
dependent on `map` ordering.) This turned out to be unnecessary to gain
determinism in the final DOT-level implementation, but it seemed
a desirable enough of a property that I left it in.
37 lines
670 B
Go
37 lines
670 B
Go
package terraform
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import "github.com/hashicorp/terraform/dag"
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// RootTransformer is a GraphTransformer that adds a root to the graph.
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type RootTransformer struct{}
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func (t *RootTransformer) Transform(g *Graph) error {
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// If we already have a good root, we're done
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if _, err := g.Root(); err == nil {
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return nil
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}
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// Add a root
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var root graphNodeRoot
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g.Add(root)
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// Connect the root to all the edges that need it
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for _, v := range g.Vertices() {
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if v == root {
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continue
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}
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if g.UpEdges(v).Len() == 0 {
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g.Connect(dag.BasicEdge(root, v))
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}
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}
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return nil
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}
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type graphNodeRoot struct{}
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func (n graphNodeRoot) Name() string {
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return "root"
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}
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