[RFC] diff: add `diff.<driver>.process` for external hunk providers #28062

System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/2.334.0/_diag/Worker_20260529-173144-utc.log' at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.Diagnostics.TextWriterTraceListener.Flush() at GitHub.Runner.Common.HostTraceListener.WriteHeader(String source, TraceEventType eventType, Int32 id) at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String message) at GitHub.Runner.Worker.Worker.RunAsync(String pipeIn, String pipeOut) at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args) System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/2.334.0/_diag/Worker_20260529-173144-utc.log' at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.Diagnostics.TextWriterTraceListener.Flush() at GitHub.Runner.Common.HostTraceListener.WriteHeader(String source, TraceEventType eventType, Int32 id) at System.Diagnostics.TraceSource.TraceEvent(TraceEventType eventType, Int32 id, String message) at GitHub.Runner.Common.Tracing.Error(Exception exception) at GitHub.Runner.Worker.Program.MainAsync(IHostContext context, String[] args) Unhandled exception. System.IO.IOException: No space left on device : '/home/runner/actions-runner/cached/2.334.0/_diag/Worker_20260529-173144-utc.log' at System.IO.RandomAccess.WriteAtOffset(SafeFileHandle handle, ReadOnlySpan`1 buffer, Int64 fileOffset) at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder) at System.Diagnostics.TextWriterTraceListener.Flush() at System.Diagnostics.TraceSource.Flush() at GitHub.Runner.Common.Tracing.Dispose(Boolean disposing) at GitHub.Runner.Common.Tracing.Dispose() at GitHub.Runner.Common.TraceManager.Dispose(Boolean disposing) at GitHub.Runner.Common.TraceManager.Dispose() at GitHub.Runner.Common.HostContext.Dispose(Boolean disposing) at GitHub.Runner.Common.HostContext.Dispose() at GitHub.Runner.Worker.Program.Main(String[] args)

win+Meson test (1)

Process completed with exit code 1.

win+Meson test (1)

failed: t4080.15 diff process startup failure only warns once

linux-reftable (ubuntu:rolling)

Canceling since a higher priority waiting request for dockerized-linux-reftable-ubuntu:rolling-refs/pull/2120/merge exists

linux-reftable (ubuntu:rolling)

The operation was canceled.

linux-TEST-vars (ubuntu:20.04)

Canceling since a higher priority waiting request for dockerized-linux-TEST-vars-ubuntu:20.04-refs/pull/2120/merge exists

linux-TEST-vars (ubuntu:20.04)

The operation was canceled.

linux-asan-ubsan (ubuntu:rolling)

Canceling since a higher priority waiting request for dockerized-linux-asan-ubsan-ubuntu:rolling-refs/pull/2120/merge exists

linux-asan-ubsan (ubuntu:rolling)

The operation was canceled.

linux-meson (ubuntu:rolling)

Canceling since a higher priority waiting request for dockerized-linux-meson-ubuntu:rolling-refs/pull/2120/merge exists

linux-meson (ubuntu:rolling)

The operation was canceled.

linux32 (i386/ubuntu:focal)

Canceling since a higher priority waiting request for dockerized-linux32-i386/ubuntu:focal-refs/pull/2120/merge exists

linux32 (i386/ubuntu:focal)

The operation was canceled.

linux-leaks (ubuntu:rolling)

Canceling since a higher priority waiting request for dockerized-linux-leaks-ubuntu:rolling-refs/pull/2120/merge exists

linux-leaks (ubuntu:rolling)

The operation was canceled.

linux-reftable-leaks (ubuntu:rolling)

Canceling since a higher priority waiting request for dockerized-linux-reftable-leaks-ubuntu:rolling-refs/pull/2120/merge exists

linux-reftable-leaks (ubuntu:rolling)

The operation was canceled.

linux-breaking-changes (ubuntu:rolling)

Canceling since a higher priority waiting request for dockerized-linux-breaking-changes-ubuntu:rolling-refs/pull/2120/merge exists

linux-breaking-changes (ubuntu:rolling)

The operation was canceled.

osx-meson (macos-14)

Canceling since a higher priority waiting request for osx-meson-macos-14-refs/pull/2120/merge exists

osx-meson (macos-14)

The operation was canceled.

osx-reftable (macos-14)

Canceling since a higher priority waiting request for osx-reftable-macos-14-refs/pull/2120/merge exists

osx-reftable (macos-14)

The operation was canceled.

osx-gcc (macos-14)

Canceling since a higher priority waiting request for osx-gcc-macos-14-refs/pull/2120/merge exists

osx-gcc (macos-14)

The operation was canceled.

osx-clang (macos-14)

Canceling since a higher priority waiting request for osx-clang-macos-14-refs/pull/2120/merge exists

osx-clang (macos-14)

The operation was canceled.

win+Meson test (4)

Process completed with exit code 1.

win+Meson test (4)

failed: t7508.126 status does not re-read unchanged 4 or 8 GiB file

win+Meson test (4)

failed: t5608.6 clone with >4GB object via index-pack

win+Meson test (4)

failed: t5608.5 clone >4GB object via unpack-objects

win+Meson test (3)

Canceling since a higher priority waiting request for windows-meson-test-3-refs/pull/2120/merge exists

win+Meson test (3)

The operation was canceled.

win test (3)

Canceling since a higher priority waiting request for windows-test-3-refs/pull/2120/merge exists

win test (3)

The operation was canceled.

win test (6)

Canceling since a higher priority waiting request for windows-test-6-refs/pull/2120/merge exists

win test (6)

The operation was canceled.

win test (5)

Canceling since a higher priority waiting request for windows-test-5-refs/pull/2120/merge exists

win test (5)

The operation was canceled.

win test (2)

Canceling since a higher priority waiting request for windows-test-2-refs/pull/2120/merge exists

win test (2)

The operation was canceled.

win test (0)

Canceling since a higher priority waiting request for windows-test-0-refs/pull/2120/merge exists

win test (0)

The operation was canceled.

win test (4)

Canceling since a higher priority waiting request for windows-test-4-refs/pull/2120/merge exists

win test (4)

The operation was canceled.

win+Meson build

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (0)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (7)

No files were found with the provided path: /d/a/git/git/build/test-output/failed-test-artifacts. No artifacts will be uploaded.

win+Meson test (7)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (5)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (2)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

fedora-breaking-changes-meson (fedora:latest)

JGit wasn't installed, see above for clues why

fedora-breaking-changes-meson (fedora:latest)

git-lfs wasn't installed, see above for clues why

fedora-breaking-changes-meson (fedora:latest)

perforce wasn't installed, see above for clues why

linux-musl-meson (alpine:latest)

JGit wasn't installed, see above for clues why

linux-musl-meson (alpine:latest)

git-lfs wasn't installed, see above for clues why

linux-musl-meson (alpine:latest)

perforce wasn't installed, see above for clues why

win+Meson test (1)

No files were found with the provided path: /d/a/git/git/build/test-output/failed-test-artifacts. No artifacts will be uploaded.

win+Meson test (1)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

almalinux-8 (almalinux:8)

JGit wasn't installed, see above for clues why

almalinux-8 (almalinux:8)

git-lfs wasn't installed, see above for clues why

almalinux-8 (almalinux:8)

perforce wasn't installed, see above for clues why

linux32 (i386/ubuntu:focal)

JGit wasn't installed, see above for clues why

linux32 (i386/ubuntu:focal)

git-lfs wasn't installed, see above for clues why

linux32 (i386/ubuntu:focal)

perforce wasn't installed, see above for clues why

osx-meson (macos-14)

JGit wasn't installed, see above for clues why

osx-meson (macos-14)

pcre2 10.47_1 is already installed and up-to-date. To reinstall 10.47_1, run: brew reinstall pcre2

osx-meson (macos-14)

ninja 1.13.2 is already installed and up-to-date. To reinstall 1.13.2, run: brew reinstall ninja

osx-meson (macos-14)

Already linked: /opt/homebrew/Cellar/gettext/1.0

osx-reftable (macos-14)

JGit wasn't installed, see above for clues why

osx-reftable (macos-14)

Already linked: /opt/homebrew/Cellar/gettext/1.0

win+Meson test (6)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

osx-gcc (macos-14)

JGit wasn't installed, see above for clues why

osx-gcc (macos-14)

Already linked: /opt/homebrew/Cellar/gettext/1.0

osx-clang (macos-14)

JGit wasn't installed, see above for clues why

osx-clang (macos-14)

Already linked: /opt/homebrew/Cellar/gettext/1.0

win+Meson test (9)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (4)

No files were found with the provided path: /d/a/git/git/build/test-output/failed-test-artifacts. No artifacts will be uploaded.

win+Meson test (4)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (8)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson test (3)

The `python-version` input is not set. The version of Python currently in `PATH` will be used.

win+Meson build