gecko-dev/build/sparse-profiles
Gregory Szorc e6c05965dd Bug 1390700 - Sparse checkout profiles for mach and taskgraph; r=dustin
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
2017-08-23 11:47:44 -07:00
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mach
taskgraph