Backport "Consolidate jvm subprocess and inprocess functions (#4456)" to 0.12 #4504
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Changes: - added functions based on com-lihaoyi#3772 description - the process related ones now return os-lib process result or subprocess handle - `callClassLoader` uses a loan pattern function and closes the classloader after usage - added `mill.util.ProcessUtil.toResult(processResult)` to handle process result in same way https://github.com/com-lihaoyi/mill/blob/main/main/util/src/mill/util/Jvm.scala#L352-L357 Some minor questions/suggestions: 1. current `spawnClassloader` is more flexible, you can pass your own classloader rather that use `getClass.getClassLoader`, this is ok I guess? 1. suggestion to name `spawnClassLoader` as `createClassLoader` 1. suggestion to name `callClassloader` as `withClassloader` (common loan pattern name) 1. `getMainMethod` is not public so `runLocal` can't be removed.. so expose `getMainMethod` or leave `runLocal` as is? 1. Some calls are inside build.mill files. I have to wait for new version of Mill with these changes included, and then update them? 1. Not sure if `closeClassLoaderWhenDone` is needed, I don't understand why it is left unclosed in few places. Closes com-lihaoyi#3772 --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
lihaoyi
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Feb 16, 2025
Should fix the rebootstrap problems found in #4545 and #4570 that seems to be caused by a mistake in this backport #4504. Not sure why this causes a hang, but for now just fixing it to revert to the previous semantics Tested manually via ```bash ./mill dist.installLocal git checkout main ./mill-assembly.jar 'integration.invalidation[selective-execution].local.fork.test' mill.integration.SelectiveExecutionWatchTests.watch.changed-code ``` Doing this manually on `0.12.x` hangs, whereas doing it on this PR succeeds
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Backport of #4456