Free disk space on Windows 2025 runners

[ChrisDenton]

I've managed to reduce the time deletion takes by:

• Using powershell, which is generally faster for filesystem operations than msys2
• Disabling defender's realtime protection
• Performing deletions concurrently then waiting for them all to complete

It still takes 2-10 mins but that's not too bad.

[rustbot]

r? @jdno

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[ChrisDenton]

@bors try jobs=x86_64-msvc-1

[rust-bors]

⌛ Trying commit e635015 with merge 0c11125…

To cancel the try build, run the command @bors try cancel.

[marcoieni]

I'll review this since I have a lot of context.

r? marcoieni

[ChrisDenton]

@bors try jobs=msvc,mingw

[rust-bors]

⌛ Trying commit 96ed33f with merge 8d49646…

(The previously running try build was automatically cancelled.)

To cancel the try build, run the command @bors try cancel.

[rust-bors]

☀️ Try build successful (CI)
Build commit: 8d49646 (8d496467c43f870fb6ca9724ba0cb278e746927d, parent: c0b282f0ccdab7523cdb8dfa41b23bed5573da76)

[ChrisDenton]

@bors try jobs=x86_64-msvc-1

[rust-bors]

⌛ Trying commit 5f662d5 with merge 9937cf4…

To cancel the try build, run the command @bors try cancel.

[rust-bors]

💔 Test failed (CI). Failed job:

• Calculate job matrix (web logs, extended logs)

[ChrisDenton]

@bors try jobs=x86_64-msvc-1

[rust-bors]

⌛ Trying commit 6616372 with merge 1644c53…

To cancel the try build, run the command @bors try cancel.

[ChrisDenton]

@bors try cancel

[rust-bors]

Try build cancelled. Cancelled workflows:

• https://github.com/rust-lang/rust/actions/runs/16453977477

[ChrisDenton]

@bors try jobs=x86_64-msvc-1

[rust-bors]

⌛ Trying commit c88ff50 with merge a21d02a…

To cancel the try build, run the command @bors try cancel.

[ChrisDenton]

@bors try cancel

[rust-bors]

Try build was cancelled. It was not possible to cancel some workflows.

[ChrisDenton]

@bors try jobs=x86_64-msvc-1

[rust-bors]

⌛ Trying commit 25281c5 with merge 543c1a0…

To cancel the try build, run the command @bors try cancel.

[rust-bors]

☀️ Try build successful (CI)
Build commit: 543c1a0 (543c1a0c837a9512fbb972b85e2b2bc5ae5aaed0, parent: 2e5367566819ca7878baa9600ae7a93eb0e37bbf)

[ChrisDenton]

I switched to use threads as spawning a shell for each job is quite heavy weight on Windows.

[marcoieni]

feel free to write this as a comment in the code if you think it's useful 👍

[marcoieni]

I tested this in https://github.com/marcoieni/actions-test and it works great! Can you squash the commit history?

[marcoieni]

After that you squashed the commits and solved the last comment, let's try it one more time on all windows jobs to see how much space is left on every job

[ChrisDenton]

Squished!

@bors try jobs=msvc,mingw

[rust-bors]

⌛ Trying commit cc46ba4 with merge 65a1769…

To cancel the try build, run the command @bors try cancel.

[rust-bors]

☀️ Try build successful (CI)
Build commit: 65a1769 (65a17699f066f1c32926ae51ab519347eec4cc42, parent: 5a30e4307f0506bed87eeecd171f8366fdbda1dc)

[marcoieni]

The commit history doesn't look clean:

[marcoieni]

try - dist-x86_64-mingw is the job with the lowest available disk space at 18G. So I think the script is removing enough disk space 🥳

Unfortunately in some jobs freeing the disk space takes up to 10 minutes. I think it's fine for now, but in the future we might want to try to make this step faster somehow 🤔

You can r=me once you clean the commit history 👍