prune: Correctly count used/duplicate blobs for partially compressed repos #3980
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…repos Counting the first occurrence of a duplicate blob as used and counting all other as duplicates, independent of which instance of the blob is kept, is only accurate if all copies of the blob have the same size. This is no longer the case for a repository containing both compressed and uncompressed blobs. Thus for duplicated blobs first count all instances as duplicates and then subtract the actually used instance later on.
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LGTM. |
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What does this PR change? What problem does it solve?
Counting the first occurrence of a duplicate blob as used and counting all other as duplicates, independent of which instance of the blob is kept, is only accurate if all copies of the blob have the same size. This is no longer the case for a repository containing both compressed and uncompressed blobs.
Thus for duplicated blobs first count all instances as duplicates and then subtract the actually used instance later on.
Was the change previously discussed in an issue or on the forum?
Fixes #3918
Checklist
[ ] I have added documentation for relevant changes (in the manual).changelog/unreleased/that describes the changes for our users (see template).gofmton the code in all commits.