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Diffstat (limited to 'Documentation/technical/commit-graph-format.txt')
| -rw-r--r-- | Documentation/technical/commit-graph-format.txt | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/technical/commit-graph-format.txt b/Documentation/technical/commit-graph-format.txt index 87971c27dd..484b185ba9 100644 --- a/Documentation/technical/commit-graph-format.txt +++ b/Documentation/technical/commit-graph-format.txt @@ -93,7 +93,7 @@ CHUNK DATA: 2 bits of the lowest byte, storing the 33rd and 34th bit of the commit time. - Generation Data (ID: {'G', 'D', 'A', 'T' }) (N * 4 bytes) [Optional] + Generation Data (ID: {'G', 'D', 'A', '2' }) (N * 4 bytes) [Optional] * This list of 4-byte values store corrected commit date offsets for the commits, arranged in the same order as commit data chunk. * If the corrected commit date offset cannot be stored within 31 bits, @@ -104,7 +104,7 @@ CHUNK DATA: by compatible versions of Git and in case of split commit-graph chains, the topmost layer also has Generation Data chunk. - Generation Data Overflow (ID: {'G', 'D', 'O', 'V' }) [Optional] + Generation Data Overflow (ID: {'G', 'D', 'O', '2' }) [Optional] * This list of 8-byte values stores the corrected commit date offsets for commits with corrected commit date offsets that cannot be stored within 31 bits. @@ -156,3 +156,11 @@ CHUNK DATA: TRAILER: H-byte HASH-checksum of all of the above. + +== Historical Notes: + +The Generation Data (GDA2) and Generation Data Overflow (GDO2) chunks have +the number '2' in their chunk IDs because a previous version of Git wrote +possibly erroneous data in these chunks with the IDs "GDAT" and "GDOV". By +changing the IDs, newer versions of Git will silently ignore those older +chunks and write the new information without trusting the incorrect data. |