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Mercurial's sparse checkout support allows "profile" files defining what's in sparse checkouts to be defined in-tree. This convenient feature means you simply need to point a client at a path inside the repository and it dynamically resolves what files to include in the checkout. As you update revisions, the "profile" pulls in updates to the underlying file. We introduce 2 sparse profiles: 1 for mach and another for taskgraph. The goal of the "mach" profile is to provide enough files to run `mach`. If you activate this profile and run `mach`, it runs without error. But there are practically no commands available. So it isn't terribly useful. The "taskgraph" profile allows us to run `mach taskgraph`. This profile demonstrates a sparse profile feature: including other profiles. The "taskgraph" profile is thus a union of "mach" and its own entries. There is definitely some fat in these profiles. I didn't feel like chasing the long tail and getting overly granular with the profiles. If we want to optimize later, we can do that. For reference: Full checkout: ~234,000 files mach: ~2,000 files taskgraph: ~3,600 files MozReview-Commit-ID: 7pALt0MwHfE --HG-- extra : rebase_source : 1a4ba4b8a63c522dab2841e2c0019501476da2fe
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