{"record":{"id":"bcfc4923cc0f73b4","repo":"Hmbown/CodeWhale","slug":"permissions-changed-after-they-were-listed-reload","errorCode":null,"errorMessage":"permissions changed after they were listed; reload {} and retry","messagePattern":"permissions changed after they were listed; reload (.+?) and retry","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/config/src/lib.rs","lineNumber":6101,"sourceCode":"    })\n}\n\n/// Remove one zero-based permission rule if `expected_token` still describes\n/// that exact index in the current file.\n///\n/// The file is re-read only after acquiring the same adjacent lock used by\n/// append operations. This makes the token check and atomic replacement one\n/// transaction, preventing stale list views from deleting a different rule.\npub fn remove_permission_rule(\n    config_path: Option<PathBuf>,\n    index: usize,\n    expected_token: &str,\n) -> Result<ToolAskRule> {\n    let path = resolve_permissions_path(config_path)?;\n    config_document::with_config_write_lock(&path, |path| {\n        let (file_exists, raw, permissions) = read_permissions_state(path)?;\n        if !file_exists {\n            bail!(\n                \"permissions changed after they were listed; reload {} and retry\",\n                quote_os_path(path)\n            );\n        }\n        let rule = permissions.rules.get(index).cloned().with_context(|| {\n            format!(\n                \"permission rule {} no longer exists in {}; list rules again\",\n                index + 1,\n                quote_os_path(path)\n            )\n        })?;\n        let current_token = permission_removal_token(path, &raw, index);\n        if current_token != expected_token {\n            bail!(\n                \"permissions changed after they were listed; reload {} and retry\",\n                quote_os_path(path)\n            );\n        }","sourceCodeStart":6083,"sourceCodeEnd":6119,"githubUrl":"https://github.com/Hmbown/CodeWhale/blob/0c42157ee52f9d55af2b506d71b46249910f77d3/crates/config/src/lib.rs#L6083-L6119","documentation":"remove_permission_rule (crates/config/src/lib.rs:6101) bails with 'permissions changed after they were listed' when the resolved permissions.toml no longer exists at removal time. The compare-and-remove flow (snapshot -> token -> remove) assumes the file you listed still exists; deleting or renaming it between list and remove trips this guard instead of writing a fresh file from stale state.","triggerScenarios":"Calling remove_permission_rule(config_path, index, token) after permissions.toml was deleted, moved, or never existed (snapshot taken from a Missing file state, then remove attempted anyway).","commonSituations":"User or a cleanup script deletes permissions.toml while a permissions UI is open; two sessions racing where one removes the file and the other tries to remove a rule from it.","solutions":["Re-run load_permissions_snapshot; a Missing file_state means there is nothing to remove — refresh the view","If rules still matter, recreate permissions.toml by appending rules through the normal flow, then list and remove","Serialize permission mutations through one surface so the file is not deleted under an active snapshot"],"exampleFix":"// before\nlet snap = load_permissions_snapshot(None)?;\n// ... permissions.toml gets deleted here ...\nremove_permission_rule(None, 0, &snap.removal_tokens[0])?; // -> changed after listed\n\n// after\nlet snap = load_permissions_snapshot(None)?;\nif snap.file_state == PermissionsFileState::Missing { /* nothing to remove; refresh UI */ }","handlingStrategy":"retry","validationCode":"let snap = load_permissions_snapshot(None)?;\nif snap.file_state == PermissionsFileState::Missing {\n    // nothing to remove; refresh the view instead of calling remove_permission_rule\n}","typeGuard":null,"tryCatchPattern":"match remove_permission_rule(None, idx, tok) {\n    Ok(rule) => { /* removed */ }\n    Err(e) if e.to_string().contains(\"permissions changed after they were listed\") => {\n        let snap = load_permissions_snapshot(None)?; // reload, then retry with fresh tokens\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Always branch on file_state from the snapshot before attempting removal","Refresh permissions views when the file disappears","Route all permission-file mutations through one owner process"],"tags":["rust","permissions","concurrency","file-state","stale-snapshot"],"backgroundTag":"optimistic-concurrency-conflict","analyzedSha":"0c42157ee52f9d55af2b506d71b46249910f77d3","analyzedAt":"2026-08-20T21:50:45.477Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}