{"record":{"id":"5f974602c9b99573","repo":"gitbutlerapp/gitbutler","slug":"commit-id-mismatch-failed-to-recreate-a-commit-fr","errorCode":null,"errorMessage":"commit id mismatch: failed to recreate a commit from its parts","messagePattern":"commit id mismatch: failed to recreate a commit from its parts","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"critical","filePath":"crates/gitbutler-oplog/src/oplog.rs","lineNumber":1006,"sourceCode":"        let Some(commits_tree_entry) = commits_tree_entry else {\n            continue;\n        };\n        let commits_tree = repo\n            .find_tree(commits_tree_entry.id())\n            .context(\"failed to convert commits tree entry to tree\")?;\n\n        // walk through all the commits in the branch\n        for commit_entry in commits_tree.iter() {\n            let commit_entry = commit_entry?;\n            // for each commit, recreate the commit from the commit data if it doesn't exist\n            let commit_id = commit_entry.filename();\n            // check for the oid in the repo\n            let commit_oid = gix::ObjectId::from_hex(commit_id)?;\n            if !repo.has_object(commit_oid) {\n                // commit is not in the repo, let's build it from our data\n                let new_commit_oid = deserialize_commit(commit_entry.id())?;\n                if new_commit_oid != commit_oid {\n                    bail!(\"commit id mismatch: failed to recreate a commit from its parts\");\n                }\n            }\n\n            // TODO: in the next iteration, this of course can't be hardcoded.\n            if branch_name == \"workspace\" {\n                restored_workspace_commit = Some(commit_oid);\n            }\n        }\n    }\n    if let Some(checkout) = restored_checkout.as_ref() {\n        if !repo.has_object(checkout.commit_id) {\n            bail!(\n                \"snapshot checkout commit {} is unavailable\",\n                checkout.commit_id\n            );\n        }\n        if checkout.ref_name.as_ref() == workspace_ref\n            && restored_workspace_commit != Some(checkout.commit_id)","sourceCodeStart":988,"sourceCodeEnd":1024,"githubUrl":"https://github.com/gitbutlerapp/gitbutler/blob/caf1f223d3cfb94488c9198ad34487c6006c648f/crates/gitbutler-oplog/src/oplog.rs#L988-L1024","documentation":"Snapshot restore recreates commits missing from the object database out of their recorded parts (tree, parents, message, author/committer). The rebuilt object must hash exactly to the commit id the snapshot recorded; a mismatch means the stored parts do not reproduce the original commit — corrupt snapshot data or a commit-serialization difference (headers, signatures, encoding) between the writing and restoring versions.","triggerScenarios":"Restoring a snapshot that references commits absent from the repository, where deserializing the stored commit data yields a different oid than the entry's recorded filename.","commonSituations":"Restoring snapshots across GitButler versions whose commit serialization changed; partially corrupted oplog trees; snapshot blobs rewritten or truncated.","solutions":["Restore from an earlier snapshot entry — the oplog usually has many","Make the commits re-fetchable: if the branch was pushed, fetch it so recreation is skipped entirely","Use the same GitButler version that wrote the snapshot, then retry","Report with the snapshot id — a deterministic hash mismatch on restore is a bug candidate"],"exampleFix":null,"handlingStrategy":"fallback","validationCode":"for entry in commits_tree.iter() {\n    let oid = gix::ObjectId::from_hex(entry.filename())?;\n    if !repo.has_object(oid) && deserialize_commit(entry.id())? != oid {\n        return Err(anyhow::anyhow!(\"snapshot cannot rebuild commit {oid}; pick another snapshot\"));\n    }\n}","typeGuard":null,"tryCatchPattern":"match oplog.restore(target_snapshot_id) {\n    Err(err) if err.to_string().contains(\"commit id mismatch\") => {\n        // walk back to the previous oplog entry and restore that instead\n    }\n    other => other,\n}","preventionTips":["Push branches so commits exist in the ODB and never need rebuilding","Don't switch GitButler versions in the middle of an undo chain"],"tags":["rust","gitbutler","oplog","restore","commit-recreation","hash-mismatch"],"backgroundTag":"object-hash-mismatch","analyzedSha":"caf1f223d3cfb94488c9198ad34487c6006c648f","analyzedAt":"2026-08-20T07:55:40.983Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}