{"record":{"id":"b8afab6996c097c7","repo":"GitoxideLabs/gitoxide","slug":"the-remembered-branch-changed-while-preparing-to-a","errorCode":null,"errorMessage":"the remembered branch changed while preparing to attach","messagePattern":"the remembered branch changed while preparing to attach","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"gix-tix/src/edit/time_travel.rs","lineNumber":526,"sourceCode":"    if !head.is_detached() || head.id().map(gix::Id::detach) != Some(head_id) {\n        anyhow::bail!(\"HEAD changed while preparing to attach\");\n    }\n    drop(head);\n    let pin = history::all_pins(repository)?\n        .into_iter()\n        .find(history::Pin::is_head)\n        .context(\"the HEAD pin disappeared while preparing to attach\")?;\n    if pin.target.try_name() != Some(remembered.branch.as_ref()) || pin.id != remembered.branch_tip {\n        anyhow::bail!(\"the HEAD pin changed while preparing to attach\");\n    }\n    let branch_id = repository\n        .find_reference(remembered.branch.as_ref())\n        .context(\"the remembered branch disappeared while preparing to attach\")?\n        .try_id()\n        .context(\"the remembered branch must be a direct reference\")?\n        .detach();\n    if branch_id != remembered.branch_tip {\n        anyhow::bail!(\"the remembered branch changed while preparing to attach\");\n    }\n    ensure_branch_is_available(repository, remembered.branch.as_ref())\n}\n\n#[cfg(test)]\npub(crate) fn attach(\n    repository_path: &Path,\n    bare: bool,\n    revisions: &[OsString],\n    include_worktrees: bool,\n) -> Result<String> {\n    Ok(attach_reporting(repository_path, bare, revisions, include_worktrees)?.0)\n}\n\npub(crate) fn attach_reporting(\n    repository_path: &Path,\n    bare: bool,\n    revisions: &[OsString],","sourceCodeStart":508,"sourceCodeEnd":544,"githubUrl":"https://github.com/GitoxideLabs/gitoxide/blob/e73179060badf27222d790981fac3f84c1830a7e/gix-tix/src/edit/time_travel.rs#L508-L544","documentation":"The remembered branch reference itself changed: its commit id no longer equals `remembered.branch_tip` at validation time. The library refuses to attach because attaching would restore a branch state that no longer matches what was captured. This is the final staleness check in `validate_attach`.","triggerScenarios":"Between remembering and validating, someone updated `refs/heads/<branch>` (commit, reset, pull) so `branch_id != remembered.branch_tip`.","commonSituations":"Another checkout doing a pull/rebase concurrently; a scheduled job pushing to the same local branch; the user manually resetting the branch between operations.","solutions":["Retry the attach after the branch stops changing.","Stop concurrent processes (pull/rebase/CI) touching this branch, then re-run.","Restart the flow to re-remember the branch tip if the new tip is acceptable."],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"match attach_reporting(...) {\n    Err(e) if e.to_string().contains(\"remembered branch changed while preparing\") => {\n        // stop concurrent writers, then re-run the flow\n        restart_attach_flow()?;\n    }\n    other => other?,\n}","preventionTips":["Stop pulls/rebases/CI jobs touching the branch before attaching.","Keep the remember-to-attach window as short as possible.","Verify `git rev-parse refs/heads/<branch>` is stable across the flow."],"tags":["git","race-condition","branch-changed","concurrency"],"backgroundTag":"invalid-state-transition","analyzedSha":"e73179060badf27222d790981fac3f84c1830a7e","analyzedAt":"2026-09-08T11:26:50.865Z","contentChangedAt":"2026-09-08T11:26:50.865Z","schemaVersion":2},"datasetVersion":"2026-09-16T04:17:20.429Z"}