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Gracefully handle output symlinks with BwoB #18075

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@fmeum fmeum commented Apr 13, 2023

If an action creates output symlinks, --remote_download_minimal now falls back to downloading all its outputs rather than failing with an exception, which most of the time led to a broken build.

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fmeum commented Apr 13, 2023

@fmeum fmeum marked this pull request as ready for review April 13, 2023 09:37
@fmeum fmeum requested a review from a team as a code owner April 13, 2023 09:37
@github-actions github-actions bot added awaiting-review PR is awaiting review from an assigned reviewer team-Remote-Exec Issues and PRs for the Execution (Remote) team labels Apr 13, 2023
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coeuvre commented Apr 13, 2023

cc @tjgq

@fmeum fmeum force-pushed the download-minimal-symlinks branch from 8cc1a74 to eff963a Compare April 13, 2023 10:05
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fmeum commented Apr 13, 2023

@bazel-io flag

@bazel-io bazel-io added the potential release blocker Flagged by community members using "@bazel-io flag". Should be added to a release blocker milestone label Apr 13, 2023
@fmeum fmeum force-pushed the download-minimal-symlinks branch from eff963a to 180927a Compare April 13, 2023 10:13
If an action creates output symlinks, `--remote_download_minimal` now
falls back to downloading all its outputs rather than failing with an
exception, which most of the time led to a broken build.
@fmeum fmeum force-pushed the download-minimal-symlinks branch from 180927a to 0c7c67a Compare April 13, 2023 10:20
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fmeum commented Apr 13, 2023

@coeuvre I fixed the test on Windows (by skipping it), but test_symlink_outputs_not_allowed_with_minimial now fails because the warning is no longer printed. Is the warning something that should be preserved? I couldn't figure out how to access EventHandler from RemoteExecutionService to show a warning without throwing an exception.

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tjgq commented Apr 13, 2023

@coeuvre I fixed the test on Windows (by skipping it), but test_symlink_outputs_not_allowed_with_minimial now fails because the warning is no longer printed. Is the warning something that should be preserved? I couldn't figure out how to access EventHandler from RemoteExecutionService to show a warning without throwing an exception.

Can you do something similar to RemoteExecutionService#reportUploadError? I think the warning is warranted because we're degrading performance in a non-obvious way, but if it's too annoying to plumb it through, I think it's also fine to just delete the test.

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fmeum commented Apr 13, 2023

@tjgq I added a warning and updated the test.

@coeuvre coeuvre added awaiting-PR-merge PR has been approved by a reviewer and is ready to be merge internally and removed awaiting-review PR is awaiting review from an assigned reviewer labels Apr 13, 2023
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keertk commented Apr 13, 2023

@bazel-io fork 6.2.0

@bazel-io bazel-io removed the potential release blocker Flagged by community members using "@bazel-io flag". Should be added to a release blocker milestone label Apr 13, 2023
@Pavank1992 Pavank1992 removed the awaiting-PR-merge PR has been approved by a reviewer and is ready to be merge internally label Apr 14, 2023
@fmeum fmeum deleted the download-minimal-symlinks branch April 14, 2023 12:29
keertk added a commit that referenced this pull request Apr 17, 2023
If an action creates output symlinks, `--remote_download_minimal` now falls back to downloading all its outputs rather than failing with an exception, which most of the time led to a broken build.

Closes #18075.

PiperOrigin-RevId: 524264497
Change-Id: Id0dc77baf1f2c7c54553cf4d7f2d52ce889d1b8b

Co-authored-by: Fabian Meumertzheim <[email protected]>
fweikert pushed a commit to fweikert/bazel that referenced this pull request May 25, 2023
If an action creates output symlinks, `--remote_download_minimal` now falls back to downloading all its outputs rather than failing with an exception, which most of the time led to a broken build.

Closes bazelbuild#18075.

PiperOrigin-RevId: 524264497
Change-Id: Id0dc77baf1f2c7c54553cf4d7f2d52ce889d1b8b
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