{"record":{"id":"d92b5079268b6e0d","repo":"rust-lang/cargo","slug":"no-path-segments-on-url","errorCode":null,"errorMessage":"no path segments on url","messagePattern":"no path segments on url","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/sources/git/utils.rs","lineNumber":1813,"sourceCode":"                // either. (This ensures that we always attempt to fetch the\n                // commit directly even if we can't reach the GitHub API.)\n                if let Some(oid) = rev_to_oid(rev) {\n                    debug!(\"github fast path is already a full commit hash {rev}\");\n                    return Ok(FastPathRev::NeedsFetch(oid));\n                }\n                rev\n            } else {\n                debug!(\"can't use github fast path with `rev = \\\"{}\\\"`\", rev);\n                return Ok(FastPathRev::Indeterminate);\n            }\n        }\n    };\n\n    // This expects GitHub urls in the form `github.com/user/repo` and nothing\n    // else\n    let mut pieces = url\n        .path_segments()\n        .ok_or_else(|| anyhow!(\"no path segments on url\"))?;\n    let username = pieces\n        .next()\n        .ok_or_else(|| anyhow!(\"couldn't find username\"))?;\n    let repository = pieces\n        .next()\n        .ok_or_else(|| anyhow!(\"couldn't find repository name\"))?;\n    if pieces.next().is_some() {\n        anyhow::bail!(\"too many segments on URL\");\n    }\n\n    // Trim off the `.git` from the repository, if present, since that's\n    // optional for GitHub and won't work when we try to use the API as well.\n    let repository = repository.strip_suffix(\".git\").unwrap_or(repository);\n\n    let url = format!(\n        \"https://api.github.com/repos/{}/{}/commits/{}\",\n        username, repository, github_branch_name,\n    );","sourceCodeStart":1795,"sourceCodeEnd":1831,"githubUrl":"https://github.com/rust-lang/cargo/blob/495c385d0875c4ba51eb72ea0448a2d4c018b8d4/src/sources/git/utils.rs#L1795-L1831","documentation":"Inside the GitHub fast-path optimization (`github_fast_path`), Cargo parses the remote URL's path segments to derive `user/repo` for the GitHub API call. `url.path_segments()` returns `None` when the URL has no path component (e.g. a `cannot-be-a-base` URL or a malformed registry/git URL). This is a sanity check that the URL is a well-formed GitHub HTTP(S) URL.","triggerScenarios":"A git dependency whose URL is non-hierarchical (scheme without a `/`-delimited path) or otherwise yields `None` from `Url::path_segments`. Only reached after earlier guards confirm the reference is resolvable via the fast path, so it implies the URL itself is structurally odd.","commonSituations":"Typo in a git dependency URL (missing host/path); using a `file://` or odd scheme URL that the fast path mistakenly enters; custom registry misconfiguration pointing at a non-GitHub URL that still got routed into the GitHub fast path.","solutions":["Correct the git dependency URL in `Cargo.toml` to a full `https://github.com/<user>/<repo>` form.","If the host is not GitHub, ensure the URL does not match GitHub fast-path preconditions, or switch to a non-fast-path reference like a full commit `rev`.","Validate the URL with `url::Url::parse` and `path_segments()` in a pre-build script."],"exampleFix":"# before\n[dependencies]\nx = { git = \"github.com/user/repo\" }   # missing scheme/host\n\n# after\n[dependencies]\nx = { git = \"https://github.com/user/repo.git\" }","handlingStrategy":"validation","validationCode":"use url::Url;\nfn validate_git_url(raw: &str) -> Result<Url, anyhow::Error> {\n    let u = Url::parse(raw)?;\n    if u.path_segments().is_none() {\n        anyhow::bail!(\"git url has no path segments: {raw}\");\n    }\n    Ok(u)\n}","typeGuard":"fn url_has_path_segments(u: &url::Url) -> bool {\n    u.path_segments().map_or(false, |mut s| s.next().is_some())\n}","tryCatchPattern":"let pieces = match url.path_segments() {\n    Some(p) => p,\n    None => return Ok(FastPathRev::Indeterminate), // skip fast path instead of erroring\n};","preventionTips":["Always include the scheme (`https://`) in git dependency URLs.","Lint `[dependencies]` git URLs in a pre-commit hook.","Prefer full `https://github.com/user/repo` URLs."],"tags":["cargo","git","url-parsing","github-fast-path","configuration"],"backgroundTag":null,"analyzedSha":"495c385d0875c4ba51eb72ea0448a2d4c018b8d4","analyzedAt":"2026-08-11T17:42:36.556Z","contentChangedAt":"2026-08-11T17:42:36.556Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}