feat(run): add --dry-run to preview cache hits - #792
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lifeiscontent wants to merge 3 commits into
Open
lifeiscontent wants to merge 3 commits into
lifeiscontent wants to merge 3 commits into
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`vp run --dry-run <task>` plans the run as usual and then reports, for each task, whether the local cache would hit, why it would miss, or that caching is disabled. A task that runs after something that isn't a hit is reported as unknown, since that earlier task could change its inputs. Nothing runs and nothing is written: the cache database is opened read-only (or skipped if it doesn't exist), the local lookup no longer records the execution key itself, and the last run summary is left alone. The remote cache is not queried.
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Motivation
Closes #791. There's no way to see which tasks a run would take from the cache without running them.
Changes
vp run --dry-run <task>plans the run as usual and prints, per task, a cache hit, a miss with the summary's reason, cache disabled, or unknown when something it runs after isn't a hit.--last-detailsis left alone. The remote cache isn't queried.try_hit_localintotry_hit, so normal runs behave the same and the dry run can share the lookup.Displayimpl so the summary and the dry run use the same text.