Check Close error when generate downloader writes files#5523
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FlushToDisk closed downloaded files via defer, discarding the Close error and logging success before the file was closed. A failed flush could leave a truncated file while the command exits 0. Close the file explicitly and propagate the error, mirroring the pattern in libs/filer/local_client.go. Co-authored-by: Isaac
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Integration test reportCommit: ef5336e
28 interesting tests: 15 SKIP, 6 flaky, 6 RECOVERED, 1 FAIL
Top 50 slowest tests (at least 2 minutes):
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Co-authored-by: Isaac
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| assert.Empty(t, downloader.files) | ||
| } | ||
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| func TestDownloader_FlushToDisk(t *testing.T) { |
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The test doesn't exercise the failure path
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Good catch, fixed in 246ff61. A real os.File Close failure can't be triggered portably in a test, so I extracted the copy+close logic into a writeAndClose helper and added TestWriteAndClose with a fake WriteCloser covering the failure paths: a Close error is returned, and a copy error is not masked by a Close error.
A real os.File Close error cannot be triggered portably in a test, so extract the copy-and-close logic into a helper and cover the failure paths with a fake WriteCloser: a Close error is returned, and a copy error is not masked by a Close error. Co-authored-by: Isaac
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janniklasrose
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Jun 12, 2026
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Integration test reportCommit: 2a71127
537 interesting tests: 481 MISS, 24 RECOVERED, 16 FAIL, 7 KNOWN, 4 PANIC, 3 flaky, 2 SKIP
Top 50 slowest tests (at least 2 minutes):
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Why
Found during a full-repo review of the CLI. When
bundle generate(andapps import) downloads notebooks and files to disk, it closed each written file with a deferredClosewhose error was discarded, and the "File successfully saved" message was printed before the file was closed. If the OS reports a write error at close time (for example a failed flush on a full or remote filesystem), the command logs success and exits 0 while leaving a truncated file on disk.Changes
Before, a failed
Closeon a downloaded file was silently ignored; now it fails the command before the success message is printed. Inbundle/generate/downloader.go,FlushToDiskcloses the file explicitly afterio.Copyand propagates theCloseerror when the copy itself succeeded, mirroring the existing pattern inlibs/filer/local_client.go. No output changes on the happy path.Test plan
TestDownloader_FlushToDiskcovering the download-write-close path end to end (file contents verified on disk). The close-error branch itself is not portably triggerable on a realos.Filewithout dependency injection, so the test covers the restructured code path.go test ./bundle/generate/passes.TestAccept/bundle/generate/job_nested_notebooks,TestAccept/bundle/generate/python_job,TestAccept/bundle/generate/pipeline../task fmt-q,./task lint-q, and./task checkspass.This pull request and its description were written by Isaac.