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    use crate::util::CargoResult;
    use cargo_util::paths;
    use cargo_util::ProcessBuilder;
    use std::path::Path;

    // Check if we are in an existing repo. We define that to be true if either:
    //
    // 1. We are in a git repo and the path to the new package is not an ignored
    //    path in that repo.
    // 2. We are in an HG repo.
    pub fn existing_vcs_repo(path: &Path, cwd: &Path) -> bool {
        fn in_git_repo(path: &Path, cwd: &Path) -> bool {
            if let Ok(repo) = GitRepo::discover(path, cwd) {
                // Don't check if the working directory itself is ignored.
                if repo.workdir().map_or(false, |workdir| workdir == path) {
                    true
                } else {
                    !repo.is_path_ignored(path).unwrap_or(false)
                }
            } else {
                false
            }
        }

        in_git_repo(path, cwd) || HgRepo::discover(path, cwd).is_ok()
    }

    pub struct HgRepo;
    pub struct GitRepo;
    pub struct PijulRepo;
    pub struct FossilRepo;

    impl GitRepo {
        pub fn init(path: &Path, _: &Path) -> CargoResult<GitRepo> {
            git2::Repository::init(path)?;
            Ok(GitRepo)
        }
        pub fn discover(path: &Path, _: &Path) -> Result<git2::Repository, git2::Error> {
            git2::Repository::discover(path)
        }
    }

    impl HgRepo {
        pub fn init(path: &Path, cwd: &Path) -> CargoResult<HgRepo> {
            ProcessBuilder::new("hg")
                .cwd(cwd)
                .arg("init")
                .arg("--")
                .arg(path)
                .exec()?;
            Ok(HgRepo)
        }
        pub fn discover(path: &Path, cwd: &Path) -> CargoResult<HgRepo> {
            ProcessBuilder::new("hg")
                .cwd(cwd)
                .arg("--cwd")
                .arg(path)
                .arg("root")
                .exec_with_output()?;
            Ok(HgRepo)
        }
    }

    impl PijulRepo {
        pub fn init(path: &Path, cwd: &Path) -> CargoResult<PijulRepo> {
            ProcessBuilder::new("pijul")
                .cwd(cwd)
                .arg("init")
                .arg("--")
                .arg(path)
                .exec()?;
            Ok(PijulRepo)
        }
    }

    impl FossilRepo {
        pub fn init(path: &Path, cwd: &Path) -> CargoResult<FossilRepo> {
            // fossil doesn't create the directory so we'll do that first
            paths::create_dir_all(path)?;

            // set up the paths we'll use
            let db_fname = ".fossil";
            let mut db_path = path.to_owned();
            db_path.push(db_fname);

            // then create the fossil DB in that location
            ProcessBuilder::new("fossil")
                .cwd(cwd)
                .arg("init")
                .arg("--")
                .arg(&db_path)
                .exec()?;

            // open it in that new directory
            ProcessBuilder::new("fossil")
                .cwd(&path)
                .arg("open")
                .arg("--")
                .arg(db_fname)
                .exec()?;

            Ok(FossilRepo)
        }
    }