Copy fuzzer script logs to correct buckets

[ViniciustCosta]

Handler for store_fuzzer_run_results in postprocess (#3406) was not adding the fuzzer script logs to the correct structured buckets, as expected by the fuzzer page on the UI. This PR tries to fix it by copying the data from the blob store to the expected buckets during postprocess.

b/361867455

[javanlacerda]

LGTM, just some nits. Thanks for fixing it.

[jonathanmetzman]

Any idea if this fixes the issue how logs points to the wrong directory here: https://clusterfuzz.com/fuzzer-stats?group_by=by-fuzzer&date_start=2025-12-26&date_end=2026-01-01&fuzzer=libFuzzer&job=libfuzzer_chrome_asan (it's getting uploaded with name None)

[ViniciustCosta]

Any idea if this fixes the issue how logs points to the wrong directory here: https://clusterfuzz.com/fuzzer-stats?group_by=by-fuzzer&date_start=2025-12-26&date_end=2026-01-01&fuzzer=libFuzzer&job=libfuzzer_chrome_asan (it's getting uploaded with name None)

Not sure if I understand what is wrong there, AFAICT they are pointing to the correct dir (for instance, clicking on libFuzzer_ac3_util_fuzzer_Ac3UtilTest_ParseTotalEac3SampleCountNeverCrashes_fuzzer leads to what seems the correct logs dir).

One thing I noticed by your question is that the method to retrieve the logs bucket name depends on the FUZZER_NAME env var, which seems to be only set during utask main. So I do need to set this in postprocess for this fix to work.

[jonathanmetzman]

Any idea if this fixes the issue how logs points to the wrong directory here: https://clusterfuzz.com/fuzzer-stats?group_by=by-fuzzer&date_start=2025-12-26&date_end=2026-01-01&fuzzer=libFuzzer&job=libfuzzer_chrome_asan (it's getting uploaded with name None)

Not sure if I understand what is wrong there, AFAICT they are pointing to the correct dir (for instance, clicking on libFuzzer_ac3_util_fuzzer_Ac3UtilTest_ParseTotalEac3SampleCountNeverCrashes_fuzzer leads to what seems the correct logs dir).

One thing I noticed by your question is that the method to retrieve the logs bucket name depends on the FUZZER_NAME env var, which seems to be only set during utask main. So I do need to set this in postprocess for this fix to work.

Weird, it's right in the link I sent you but not this one (because it's from oss-fuzz) https://oss-fuzz.com/fuzzer-stats?project=abseil-cpp&fuzzer=afl&job=afl_asan_abseil-cpp&group_by=by-fuzzer
The link from stats page is the correct one (what the logs SHOULD be uploaded to).
But if you look at the bucket, they are uploaded with an incorrect None in the name

[ViniciustCosta]

Weird, it's right in the link I sent you but not this one (because it's from oss-fuzz) https://oss-fuzz.com/fuzzer-stats?project=abseil-cpp&fuzzer=afl&job=afl_asan_abseil-cpp&group_by=by-fuzzer The link from stats page is the correct one (what the logs SHOULD be uploaded to). But if you look at the bucket, they are uploaded with an incorrect None in the name

Ah I see, it seems an issue only in oss-fuzz. I can take a look, but this is not exactly related to this PR.
Notice that the codepath that is being changed here is only reach by blackbox fuzzers (enforced by this PR #4239)

[jonathanmetzman]

No worries!