Commit a6526403 authored by Committed by Mikhail GlushenkovBrowse files
Add new style project building
This stage takes the ElaboratedInstallPlan and executes it. It does it in two passes. The first pass is the "dry run" pass where we work out which packages and components within packages we actually need to build. If we are in fact in --dry-run mode then of course this is the only pass we run, we have enough info after this to accurately report on what we would do. The first pass does the file monitor change stuff, which checks if package config has changed and probes for package file changes. Based on this we make a note of which phase of the build we would start at, up to and including skipping building that package entirely. In the latter case we replace the Configured package by a corresponding Installed package. The first pass also prunes the ElaboratedInstallPlan based on the targets that the user actually wants to build. For example we solve and plan on the basis that the user might want to run the test suites or benchmarks, but that doesn't mean we want to build them all the time (they'll usually pull in additional deps). So there's a moderately complex pass where we keep just the packages and components that are needed to build the target components. The first pass is moderately complicated but it makes no state changes and just returns the updated ElaboratedInstallPlan, so it should make things easier to debug. The second phase has very little logic it just does what its told based on all the earlier passes. For each package the dry run pass has worked out which build step to start with, e.g. downloading, configuring or building. The major cases the build phase has to deal with are packages that will be built and installed to the store, vs packages that are local and so are built inplace. It is only the latter that need all the complex rebuild checking. In both cases all the "setup $cmd" flags are calculated by the planning phase and we just do as we're told. (cherry picked from commit 300d9bad)
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