{"record":{"id":"b68baf7df0d61280","repo":"xai-org/grok-build","slug":"jj-command-failed","errorCode":null,"errorMessage":"jj command failed","messagePattern":"jj command failed","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/codegen/xai-grok-workspace/src/session/git.rs","lineNumber":172,"sourceCode":"    let stderr = String::from_utf8_lossy(&output.stderr).trim().to_string();\n    if output.status.success() {\n        let stdout = String::from_utf8_lossy(&output.stdout).trim().to_string();\n        if !stderr.is_empty() {\n            tracing::warn!(\n                cwd = %cwd.display(),\n                \"jj_cli success with stderr warnings\"\n            );\n        }\n        tracing::debug!(exit_code = 0, stdout_len = stdout.len(), \"jj_cli success\");\n        Ok(stdout)\n    } else {\n        let code = output.status.code();\n        tracing::warn!(\n            cwd = %cwd.display(),\n            exit_code = ?code,\n            \"jj_cli FAILED\"\n        );\n        Err(anyhow::anyhow!(\n            \"{}\",\n            if stderr.is_empty() {\n                \"jj command failed\"\n            } else {\n                &stderr\n            }\n        ))\n    }\n}\n/// Detect the VCS kind for a given path based on the discovered git root.\n///\n/// Checks for `.jj/` directory alongside `.git/` to identify colocated Jujutsu repos.\npub fn detect_vcs_kind(git_root: &Path) -> VcsKind {\n    if git_root.join(\".jj\").is_dir() {\n        VcsKind::JujutsuColocated\n    } else {\n        VcsKind::Git\n    }","sourceCodeStart":154,"sourceCodeEnd":190,"githubUrl":"https://github.com/xai-org/grok-build/blob/bc7f02eddd3d84085849dc19ed216f11c23b0571/crates/codegen/xai-grok-workspace/src/session/git.rs#L154-L190","documentation":"`jj_cli_inner` (behind `jj_cli`/`jj_cli_mut`) runs the Jujutsu (`jj`) CLI in a working directory — with `--ignore-working-copy` for read-only queries — and returns trimmed stdout. On non-zero exit the error message is the trimmed stderr; if jj wrote nothing to stderr this generic fallback \"jj command failed\" is used. This is the jj counterpart of the git_cli failure path.","triggerScenarios":"Any jj invocation via `jj_cli`/`jj_cli_mut` that exits non-zero with empty stderr: no jj repo in cwd, jj version too old to support a flag like `--ignore-working-copy`, corrupted repo, or jj terminated by a signal leaving stderr empty.","commonSituations":"Calling jj commands in a plain git repo without `.jj/` (not colocated); ancient jj versions lacking `--ignore-working-copy`; workspace operations on repos with unresolved conflicts; jj not on PATH in the spawned environment.","solutions":["Run the same jj command manually in the cwd (`jj -R <cwd> log`) to see the real error.","Confirm the repo is jj-initialized or colocated (a `.jj/` directory exists) before calling jj commands.","Upgrade jj (`jj --version`) — older releases may not support `--ignore-working-copy`.","Run `jj workspace add`/re-init if the workspace metadata is missing or corrupt."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// Only call jj commands on jj repos, and ensure jj is installed\nfn jj_available(cwd: &Path) -> bool {\n    cwd.join(\".jj\").is_dir()\n        && std::process::Command::new(\"jj\")\n            .arg(\"--version\")\n            .output().map(|o| o.status.success()).unwrap_or(false)\n}","typeGuard":null,"tryCatchPattern":"match jj_cli(cwd, &[\"log\", \"-r\", \"@\"]).await {\n    Ok(out) => use_output(out),\n    Err(e) if e.to_string() == \"jj command failed\" => {\n        eprintln!(\"jj failed in {} with no stderr — run the command manually to see why\", cwd.display());\n    }\n    Err(e) => eprintln!(\"jj: {e}\"),\n}","preventionTips":["Use `detect_vcs_kind` to route git vs jj instead of calling jj blindly in git-only repos.","Keep jj up to date — read-only helpers pass `--ignore-working-copy`, absent in old versions.","Check `.jj/` exists (colocated repo) before issuing jj queries.","Empty-stderr failures are logged via tracing::warn with cwd and exit code — enable debug logs when diagnosing."],"tags":["jujutsu","subprocess","vcs","rust"],"backgroundTag":"git-command-failed","analyzedSha":"bc7f02eddd3d84085849dc19ed216f11c23b0571","analyzedAt":"2026-08-31T04:59:42.031Z","schemaVersion":2},"datasetVersion":"2026-08-31T09:17:48.483Z"}