var errUnknownSite = errors.New("dynamic lookup required to find mapping")

// repoRootFromVCSPaths attempts to map importPath to a repoRoot
// using the mappings defined in vcsPaths.
func repoRootFromVCSPaths(importPath string, security web.SecurityMode, vcsPaths []*vcsPath) (*RepoRoot, error) {
	if str.HasPathPrefix(importPath, "example.net") {
		// TODO(rsc): This should not be necessary, but it's required to keep