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Add --subset-id-file option to capture subset ID without parsing stderr#1305

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takanabe wants to merge 3 commits into
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expose-subset-id
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Add --subset-id-file option to capture subset ID without parsing stderr#1305
takanabe wants to merge 3 commits into
mainfrom
expose-subset-id

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@takanabe
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The subset ID is needed for downstream operations (inspect subset, compare subsets, --input-snapshot-id) but was previously only available by parsing stderr. The new --subset-id-file option writes the subset ID to a file as a side-channel, leaving stdout byte-for-byte unchanged so existing test runner pipelines are unaffected.

The subset ID is needed for downstream operations (inspect subset, compare
subsets, --input-snapshot-id) but was previously only available by parsing
stderr. The new --subset-id-file <path> option writes the subset ID
to a file as a side-channel, leaving stdout byte-for-byte unchanged so
existing test runner pipelines are unaffected.
@takanabe takanabe requested a review from Konboi May 27, 2026 22:22
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LGTM

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