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THis is mostly cleanup and a little bit feature.
Before it was done partially in 3 places, BuildBuild,
loadRoot and GitDependency. Now DirectoryDependencies
also support referencing sub-builds.
Also introduce scalariform for the first few files
of cbt's core code :).
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last file watching update didn’t work well enough. This now
- rips out barbary watch service as it seems buggy crashing the jvm
- make cbt exclusively write files to watch to a file
- uses fswatch instead watching all files in that file
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and prepares for allowing `run` and `runFlat` at
Dependency instead of Build level
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by replacing context.projectDirectory by workingDirectory and using
it as the default but allowing it to being overridden
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using lastModified instead of a non-idempotent needsUpdate flag
this fixes a bug where dependees would not be rebuilt if cbt exited
or was killed after dependencies were already rebuilt.
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We had a problem where cbt cloned a repository, then tried to checkout
the desired ref, but if it didn't exist would get stuck with that ref
and never try again to fetch the correct one. This would lead to wrong
versions of libraries and cbt being loaded for particular referenced refs
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seems to be more precise than BuildDependency, hence hopefully more readable
also cleaned up Scaffolding and added DirectoryDependency example
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changes builds from using immutable.Seq to using Predef.Seq in favor of simplicity over purity. This has been discussed on gitter.
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One large commit, because it is was hard to do these things in isolation or to separate them now.
CBT now knows how to load other versions of itself
- Support for reproducible builds (!), by providing a CBT git URL and hash to tie build to
- Support for composing builds using different CBT versions (!)
- introduce (in compatibility/) Java interfaces all CBT versions need to stay compatible with, so they can talk to each other. And put extension methods to these interfaces in cbt package object
Class loading
- add some sanity checks for class loading
- improve class loader invalidation to fix bugs
- implement caching in Java land class loaders. In particular to prevent the system class loader to repeatedly generate ClassNotFound exceptions in each sink of the class loader DAG for non JDK classes (meaning major speed up for projects with many classes).
- getting rid of transient class loader cache unifying into "persistent" one instead (which is still wrong as invalidation eventually needs to invalidate entire sub graphs of the class loading DAG, not single class loaders. Seems like we'll have to abandon the hashmap based approach and tie caching to dependency objects)
Other Caching
- cache dependencies extracted from xml files, which was one major time killer, but invalidate cache when cbt changed (maven dependency user facing api needs simplification now!)
- memorize last successful compile time in the file system rather than memory, to guard against unnecessary recompiling even across launches (or when using cbt direct)
Structural improvements
- Factor out ClassLoaderCache on Java land into its own class.
- Port MultiClassLoader to Java land, to better compose classloaders in NailgunLauncher.
- Remove many global constants and variables (in object paths and in NailgunLauncher) and pass them through instead. Needed for composing of builds.
- move more code from resolver into Lib for less entanglement with classes (needed to compatibility interfaces) and better re-usability
- remove canBeCached. Everything can be cached now, but we need to be careful about correct invalidation.
- remove build announcing produced jars. We can add if ever needed.
- change callNullary to return exit code instead of Unit as preparation for next commit introducing "recursive"
ScalaTest
- Makes ScalaTest support work (still a bit too inflexible, but mostly works well)
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Also separate out regex, so we can use it to detect cbt version urls later
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in case of a BuildBuild.
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This commit also
- requires Dependencies to explicitly implement canBeCached
- unifies some logic for dependency downloading
- moves SBT-like dependency DSL into its own trait
- error message showing build directory for exceptions in builds
Not splitting this up in favor of faster progress to 1.0.
The user facing API can probably be slightly improved using implicits
inside of BasicBuild, but we can do that later.
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(and safe up to 0.1s for each call)
There still seem to be 2 bugs related to CBT development in the code. One if you simpy save a stage1 file unchanged and re-run cbt, it fails to call Stage2.run reflectively. Also in case of compile errors in stage1, a TrappedExitCode exception is thrown and not caught.
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caching classloaders hierarchically without deadlocks
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pair coded with @chavxo
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