When I run snakemake --dag | dot or snakemake --rulegraph | dot multiple times on the same workflow, I get diagrams with identical layout but different colors for the various nodes. I'm investigating how feasible it would be to make the output from snakemake --dag and snakemake --rulegraph deterministic.

Unless I've missed or misunderstood something, the code for coloring nodes in the DAG._dot method is deterministic.

Being unfamiliar with Snakemake internals, if I had to guess, I'd assume that the non-deterministic behavior comes when iterating over self.jobs, which happens both for --dag and --rulegraph modes.

Am I on the right track here? Would it be possible with a reasonable amount of effort to generate DOT output deterministically for these modes?