annotate rust/hg-core/src/dirstate_tree/status.rs @ 49555:8ee3889bab92 stable

rust-status: save new dircache even if just invalidated

There was a functional race between invalidating the cache (not acted upon
until the end of the status algorithm) and populating the new cache (which
relies upon an up-to-date version of the cache).

We simply inform the cache populating function that we've just invalidated
the cache for this particular directory since the information is present in
the same scope.

use crate::dirstate::entry::TruncatedTimestamp;
use crate::dirstate::status::IgnoreFnType;
use crate::dirstate::status::StatusPath;
use crate::dirstate_tree::dirstate_map::BorrowedPath;
use crate::dirstate_tree::dirstate_map::ChildNodesRef;
use crate::dirstate_tree::dirstate_map::DirstateMap;
use crate::dirstate_tree::dirstate_map::DirstateVersion;
use crate::dirstate_tree::dirstate_map::NodeRef;
use crate::dirstate_tree::on_disk::DirstateV2ParseError;
use crate::matchers::get_ignore_function;
use crate::matchers::Matcher;
use crate::utils::files::get_bytes_from_os_string;
use crate::utils::files::get_path_from_bytes;
use crate::utils::hg_path::HgPath;
use crate::BadMatch;
use crate::DirstateStatus;
use crate::HgPathBuf;
use crate::HgPathCow;
use crate::PatternFileWarning;
use crate::StatusError;
use crate::StatusOptions;
use micro_timer::timed;
use once_cell::sync::OnceCell;
use rayon::prelude::*;
use sha1::{Digest, Sha1};
use std::borrow::Cow;
use std::io;
use std::path::Path;
use std::path::PathBuf;
use std::sync::Mutex;
use std::time::SystemTime;

/// Returns the status of the working directory compared to its parent
/// changeset.
///
/// This algorithm is based on traversing the filesystem tree (`fs` in function
/// and variable names) and dirstate tree at the same time. The core of this
/// traversal is the recursive `traverse_fs_directory_and_dirstate` function
/// and its use of `itertools::merge_join_by`. When reaching a path that only
/// exists in one of the two trees, depending on information requested by
/// `options` we may need to traverse the remaining subtree.
#[timed]
pub fn status<'dirstate>(
    dmap: &'dirstate mut DirstateMap,
    matcher: &(dyn Matcher + Sync),
    root_dir: PathBuf,
    ignore_files: Vec<PathBuf>,
    options: StatusOptions,
) -> Result<(DirstateStatus<'dirstate>, Vec<PatternFileWarning>), StatusError>
{
    // Force the global rayon threadpool to not exceed 16 concurrent threads.
    // This is a stop-gap measure until we figure out why using more than 16
    // threads makes `status` slower for each additional thread.
    // We use `ok()` in case the global threadpool has already been
    // instantiated in `rhg` or some other caller.
    // TODO find the underlying cause and fix it, then remove this.
    rayon::ThreadPoolBuilder::new()
        .num_threads(16)
        .build_global()
        .ok();

    let (ignore_fn, warnings, patterns_changed): (IgnoreFnType, _, _) =
        if options.list_ignored || options.list_unknown {
            let (ignore_fn, warnings, changed) = match dmap.dirstate_version {
                DirstateVersion::V1 => {
                    let (ignore_fn, warnings) = get_ignore_function(
                        ignore_files,
                        &root_dir,
                        &mut |_pattern_bytes| {},
                    )?;
                    (ignore_fn, warnings, None)
                }
                DirstateVersion::V2 => {
                    let mut hasher = Sha1::new();
                    let (ignore_fn, warnings) = get_ignore_function(
                        ignore_files,
                        &root_dir,
                        &mut |pattern_bytes| hasher.update(pattern_bytes),
                    )?;
                    let new_hash = *hasher.finalize().as_ref();
                    let changed = new_hash != dmap.ignore_patterns_hash;
                    dmap.ignore_patterns_hash = new_hash;
                    (ignore_fn, warnings, Some(changed))
                }
            };
            (ignore_fn, warnings, changed)
        } else {
            (Box::new(|&_| true), vec![], None)
        };

    let filesystem_time_at_status_start =
        filesystem_now(&root_dir).ok().map(TruncatedTimestamp::from);

    // If the repository is under the current directory, prefer using a
    // relative path, so the kernel needs to traverse fewer directory in every
    // call to `read_dir` or `symlink_metadata`.
    // This is effective in the common case where the current directory is the
    // repository root.

    // TODO: Better yet would be to use libc functions like `openat` and
    // `fstatat` to remove such repeated traversals entirely, but the standard
    // library does not provide APIs based on those.
    // Maybe with a crate like https://crates.io/crates/openat instead?
    let root_dir = if let Some(relative) = std::env::current_dir()
        .ok()
        .and_then(|cwd| root_dir.strip_prefix(cwd).ok())
    {
        relative
    } else {
        &root_dir
    };

    let outcome = DirstateStatus {
        filesystem_time_at_status_start,
        ..Default::default()
    };
    let common = StatusCommon {
        dmap,
        options,
        matcher,
        ignore_fn,
        outcome: Mutex::new(outcome),
        ignore_patterns_have_changed: patterns_changed,
        new_cacheable_directories: Default::default(),
        outdated_cached_directories: Default::default(),
        filesystem_time_at_status_start,
    };
    let is_at_repo_root = true;
    let hg_path = &BorrowedPath::OnDisk(HgPath::new(""));
    let has_ignored_ancestor = HasIgnoredAncestor::create(None, hg_path);
    let root_cached_mtime = None;
    let root_dir_metadata = None;
    // If the path we have for the repository root is a symlink, do follow it.
    // (As opposed to symlinks within the working directory which are not
    // followed, using `std::fs::symlink_metadata`.)
    common.traverse_fs_directory_and_dirstate(
        &has_ignored_ancestor,
        dmap.root.as_ref(),
        hg_path,
        &root_dir,
        root_dir_metadata,
        root_cached_mtime,
        is_at_repo_root,
    )?;
    let mut outcome = common.outcome.into_inner().unwrap();
    let new_cacheable = common.new_cacheable_directories.into_inner().unwrap();
    let outdated = common.outdated_cached_directories.into_inner().unwrap();

    outcome.dirty = common.ignore_patterns_have_changed == Some(true)
        || !outdated.is_empty()
        || (!new_cacheable.is_empty()
            && dmap.dirstate_version == DirstateVersion::V2);

    // Remove outdated mtimes before adding new mtimes, in case a given
    // directory is both
    for path in &outdated {
        dmap.clear_cached_mtime(path)?;
    }
    for (path, mtime) in &new_cacheable {
        dmap.set_cached_mtime(path, *mtime)?;
    }

    Ok((outcome, warnings))
}

/// Bag of random things needed by various parts of the algorithm. Reduces the
/// number of parameters passed to functions.
struct StatusCommon<'a, 'tree, 'on_disk: 'tree> {
    dmap: &'tree DirstateMap<'on_disk>,
    options: StatusOptions,
    matcher: &'a (dyn Matcher + Sync),
    ignore_fn: IgnoreFnType<'a>,
    outcome: Mutex<DirstateStatus<'on_disk>>,
    /// New timestamps of directories to be used for caching their readdirs
    new_cacheable_directories:
        Mutex<Vec<(Cow<'on_disk, HgPath>, TruncatedTimestamp)>>,
    /// Used to invalidate the readdir cache of directories
    outdated_cached_directories: Mutex<Vec<Cow<'on_disk, HgPath>>>,

    /// Whether ignore files like `.hgignore` have changed since the previous
    /// time a `status()` call wrote their hash to the dirstate. `None` means
    /// we don’t know as this run doesn’t list either ignored or uknown files
    /// and therefore isn’t reading `.hgignore`.
    ignore_patterns_have_changed: Option<bool>,

    /// The current time at the start of the `status()` algorithm, as measured
    /// and possibly truncated by the filesystem.
    filesystem_time_at_status_start: Option<TruncatedTimestamp>,
}

enum Outcome {
    Modified,
    Added,
    Removed,
    Deleted,
    Clean,
    Ignored,
    Unknown,
    Unsure,
}

/// Lazy computation of whether a given path has a hgignored
/// ancestor.
struct HasIgnoredAncestor<'a> {
    /// `path` and `parent` constitute the inputs to the computation,
    /// `cache` stores the outcome.
    path: &'a HgPath,
    parent: Option<&'a HasIgnoredAncestor<'a>>,
    cache: OnceCell<bool>,
}

impl<'a> HasIgnoredAncestor<'a> {
    fn create(
        parent: Option<&'a HasIgnoredAncestor<'a>>,
        path: &'a HgPath,
    ) -> HasIgnoredAncestor<'a> {
        Self {
            path,
            parent,
            cache: OnceCell::new(),
        }
    }

    fn force<'b>(&self, ignore_fn: &IgnoreFnType<'b>) -> bool {
        match self.parent {
            None => false,
            Some(parent) => {
                *(parent.cache.get_or_init(|| {
                    parent.force(ignore_fn) || ignore_fn(&self.path)
                }))
            }
        }
    }
}

impl<'a, 'tree, 'on_disk> StatusCommon<'a, 'tree, 'on_disk> {
    fn push_outcome(
        &self,
        which: Outcome,
        dirstate_node: &NodeRef<'tree, 'on_disk>,
    ) -> Result<(), DirstateV2ParseError> {
        let path = dirstate_node
            .full_path_borrowed(self.dmap.on_disk)?
            .detach_from_tree();
        let copy_source = if self.options.list_copies {
            dirstate_node
                .copy_source_borrowed(self.dmap.on_disk)?
                .map(|source| source.detach_from_tree())
        } else {
            None
        };
        self.push_outcome_common(which, path, copy_source);
        Ok(())
    }

    fn push_outcome_without_copy_source(
        &self,
        which: Outcome,
        path: &BorrowedPath<'_, 'on_disk>,
    ) {
        self.push_outcome_common(which, path.detach_from_tree(), None)
    }

    fn push_outcome_common(
        &self,
        which: Outcome,
        path: HgPathCow<'on_disk>,
        copy_source: Option<HgPathCow<'on_disk>>,
    ) {
        let mut outcome = self.outcome.lock().unwrap();
        let vec = match which {
            Outcome::Modified => &mut outcome.modified,
            Outcome::Added => &mut outcome.added,
            Outcome::Removed => &mut outcome.removed,
            Outcome::Deleted => &mut outcome.deleted,
            Outcome::Clean => &mut outcome.clean,
            Outcome::Ignored => &mut outcome.ignored,
            Outcome::Unknown => &mut outcome.unknown,
            Outcome::Unsure => &mut outcome.unsure,
        };
        vec.push(StatusPath { path, copy_source });
    }

    fn read_dir(
        &self,
        hg_path: &HgPath,
        fs_path: &Path,
        is_at_repo_root: bool,
    ) -> Result<Vec<DirEntry>, ()> {
        DirEntry::read_dir(fs_path, is_at_repo_root)
            .map_err(|error| self.io_error(error, hg_path))
    }

    fn io_error(&self, error: std::io::Error, hg_path: &HgPath) {
        let errno = error.raw_os_error().expect("expected real OS error");
        self.outcome
            .lock()
            .unwrap()
            .bad
            .push((hg_path.to_owned().into(), BadMatch::OsError(errno)))
    }

    fn check_for_outdated_directory_cache(
        &self,
        dirstate_node: &NodeRef<'tree, 'on_disk>,
    ) -> Result<bool, DirstateV2ParseError> {
        if self.ignore_patterns_have_changed == Some(true)
            && dirstate_node.cached_directory_mtime()?.is_some()
        {
            self.outdated_cached_directories.lock().unwrap().push(
                dirstate_node
                    .full_path_borrowed(self.dmap.on_disk)?
                    .detach_from_tree(),
            );
            return Ok(true);
        }
        Ok(false)
    }

    /// If this returns true, we can get accurate results by only using
    /// `symlink_metadata` for child nodes that exist in the dirstate and don’t
    /// need to call `read_dir`.
    fn can_skip_fs_readdir(
        &self,
        directory_metadata: Option<&std::fs::Metadata>,
        cached_directory_mtime: Option<TruncatedTimestamp>,
    ) -> bool {
        if !self.options.list_unknown && !self.options.list_ignored {
            // All states that we care about listing have corresponding
            // dirstate entries.
            // This happens for example with `hg status -mard`.
            return true;
        }
        if !self.options.list_ignored
            && self.ignore_patterns_have_changed == Some(false)
        {
            if let Some(cached_mtime) = cached_directory_mtime {
                // The dirstate contains a cached mtime for this directory, set
                // by a previous run of the `status` algorithm which found this
                // directory eligible for `read_dir` caching.
                if let Some(meta) = directory_metadata {
                    if cached_mtime
                        .likely_equal_to_mtime_of(meta)
                        .unwrap_or(false)
                    {
                        // The mtime of that directory has not changed
                        // since then, which means that the results of
                        // `read_dir` should also be unchanged.
                        return true;
                    }
                }
            }
        }
        false
    }

    /// Returns whether all child entries of the filesystem directory have a
    /// corresponding dirstate node or are ignored.
    fn traverse_fs_directory_and_dirstate<'ancestor>(
        &self,
        has_ignored_ancestor: &'ancestor HasIgnoredAncestor<'ancestor>,
        dirstate_nodes: ChildNodesRef<'tree, 'on_disk>,
        directory_hg_path: &BorrowedPath<'tree, 'on_disk>,
        directory_fs_path: &Path,
        directory_metadata: Option<&std::fs::Metadata>,
        cached_directory_mtime: Option<TruncatedTimestamp>,
        is_at_repo_root: bool,
    ) -> Result<bool, DirstateV2ParseError> {
        if self.can_skip_fs_readdir(directory_metadata, cached_directory_mtime)
        {
            dirstate_nodes
                .par_iter()
                .map(|dirstate_node| {
                    let fs_path = directory_fs_path.join(get_path_from_bytes(
                        dirstate_node.base_name(self.dmap.on_disk)?.as_bytes(),
                    ));
                    match std::fs::symlink_metadata(&fs_path) {
                        Ok(fs_metadata) => self.traverse_fs_and_dirstate(
                            &fs_path,
                            &fs_metadata,
                            dirstate_node,
                            has_ignored_ancestor,
                        ),
                        Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
                            self.traverse_dirstate_only(dirstate_node)
                        }
                        Err(error) => {
                            let hg_path =
                                dirstate_node.full_path(self.dmap.on_disk)?;
                            Ok(self.io_error(error, hg_path))
                        }
                    }
                })
                .collect::<Result<_, _>>()?;

            // We don’t know, so conservatively say this isn’t the case
            let children_all_have_dirstate_node_or_are_ignored = false;

            return Ok(children_all_have_dirstate_node_or_are_ignored);
        }

        let mut fs_entries = if let Ok(entries) = self.read_dir(
            directory_hg_path,
            directory_fs_path,
            is_at_repo_root,
        ) {
            entries
        } else {
            // Treat an unreadable directory (typically because of insufficient
            // permissions) like an empty directory. `self.read_dir` has
            // already called `self.io_error` so a warning will be emitted.
            Vec::new()
        };

        // `merge_join_by` requires both its input iterators to be sorted:

        let dirstate_nodes = dirstate_nodes.sorted();
        // `sort_unstable_by_key` doesn’t allow keys borrowing from the value:
        // https://github.com/rust-lang/rust/issues/34162
        fs_entries.sort_unstable_by(|e1, e2| e1.base_name.cmp(&e2.base_name));

        // Propagate here any error that would happen inside the comparison
        // callback below
        for dirstate_node in &dirstate_nodes {
            dirstate_node.base_name(self.dmap.on_disk)?;
        }
        itertools::merge_join_by(
            dirstate_nodes,
            &fs_entries,
            |dirstate_node, fs_entry| {
                // This `unwrap` never panics because we already propagated
                // those errors above
                dirstate_node
                    .base_name(self.dmap.on_disk)
                    .unwrap()
                    .cmp(&fs_entry.base_name)
            },
        )
        .par_bridge()
        .map(|pair| {
            use itertools::EitherOrBoth::*;
            let has_dirstate_node_or_is_ignored;
            match pair {
                Both(dirstate_node, fs_entry) => {
                    self.traverse_fs_and_dirstate(
                        &fs_entry.full_path,
                        &fs_entry.metadata,
                        dirstate_node,
                        has_ignored_ancestor,
                    )?;
                    has_dirstate_node_or_is_ignored = true
                }
                Left(dirstate_node) => {
                    self.traverse_dirstate_only(dirstate_node)?;
                    has_dirstate_node_or_is_ignored = true;
                }
                Right(fs_entry) => {
                    has_dirstate_node_or_is_ignored = self.traverse_fs_only(
                        has_ignored_ancestor.force(&self.ignore_fn),
                        directory_hg_path,
                        fs_entry,
                    )
                }
            }
            Ok(has_dirstate_node_or_is_ignored)
        })
        .try_reduce(|| true, |a, b| Ok(a && b))
    }

    fn traverse_fs_and_dirstate<'ancestor>(
        &self,
        fs_path: &Path,
        fs_metadata: &std::fs::Metadata,
        dirstate_node: NodeRef<'tree, 'on_disk>,
        has_ignored_ancestor: &'ancestor HasIgnoredAncestor<'ancestor>,
    ) -> Result<(), DirstateV2ParseError> {
        let outdated_dircache =
            self.check_for_outdated_directory_cache(&dirstate_node)?;
        let hg_path = &dirstate_node.full_path_borrowed(self.dmap.on_disk)?;
        let file_type = fs_metadata.file_type();
        let file_or_symlink = file_type.is_file() || file_type.is_symlink();
        if !file_or_symlink {
            // If we previously had a file here, it was removed (with
            // `hg rm` or similar) or deleted before it could be
            // replaced by a directory or something else.
            self.mark_removed_or_deleted_if_file(&dirstate_node)?;
        }
        if file_type.is_dir() {
            if self.options.collect_traversed_dirs {
                self.outcome
                    .lock()
                    .unwrap()
                    .traversed
                    .push(hg_path.detach_from_tree())
            }
            let is_ignored = HasIgnoredAncestor::create(
                Some(&has_ignored_ancestor),
                hg_path,
            );
            let is_at_repo_root = false;
            let children_all_have_dirstate_node_or_are_ignored = self
                .traverse_fs_directory_and_dirstate(
                    &is_ignored,
                    dirstate_node.children(self.dmap.on_disk)?,
                    hg_path,
                    fs_path,
                    Some(fs_metadata),
                    dirstate_node.cached_directory_mtime()?,
                    is_at_repo_root,
                )?;
            self.maybe_save_directory_mtime(
                children_all_have_dirstate_node_or_are_ignored,
                fs_metadata,
                dirstate_node,
                outdated_dircache,
            )?
        } else {
            if file_or_symlink && self.matcher.matches(&hg_path) {
                if let Some(entry) = dirstate_node.entry()? {
                    if !entry.any_tracked() {
                        // Forward-compat if we start tracking unknown/ignored
                        // files for caching reasons
                        self.mark_unknown_or_ignored(
                            has_ignored_ancestor.force(&self.ignore_fn),
                            &hg_path,
                        );
                    }
                    if entry.added() {
                        self.push_outcome(Outcome::Added, &dirstate_node)?;
                    } else if entry.removed() {
                        self.push_outcome(Outcome::Removed, &dirstate_node)?;
                    } else if entry.modified() {
                        self.push_outcome(Outcome::Modified, &dirstate_node)?;
                    } else {
                        self.handle_normal_file(&dirstate_node, fs_metadata)?;
                    }
                } else {
                    // `node.entry.is_none()` indicates a "directory"
                    // node, but the filesystem has a file
                    self.mark_unknown_or_ignored(
                        has_ignored_ancestor.force(&self.ignore_fn),
                        hg_path,
                    );
                }
            }

            for child_node in dirstate_node.children(self.dmap.on_disk)?.iter()
            {
                self.traverse_dirstate_only(child_node)?
            }
        }
        Ok(())
    }

    /// Save directory mtime if applicable.
    ///
    /// `outdated_directory_cache` is `true` if we've just invalidated the
    /// cache for this directory in `check_for_outdated_directory_cache`,
    /// which forces the update.
    fn maybe_save_directory_mtime(
        &self,
        children_all_have_dirstate_node_or_are_ignored: bool,
        directory_metadata: &std::fs::Metadata,
        dirstate_node: NodeRef<'tree, 'on_disk>,
        outdated_directory_cache: bool,
    ) -> Result<(), DirstateV2ParseError> {
        if !children_all_have_dirstate_node_or_are_ignored {
            return Ok(());
        }
        // All filesystem directory entries from `read_dir` have a
        // corresponding node in the dirstate, so we can reconstitute the
        // names of those entries without calling `read_dir` again.

        // TODO: use let-else here and below when available:
        // https://github.com/rust-lang/rust/issues/87335
        let status_start = if let Some(status_start) =
            &self.filesystem_time_at_status_start
        {
            status_start
        } else {
            return Ok(());
        };

        // Although the Rust standard library’s `SystemTime` type
        // has nanosecond precision, the times reported for a
        // directory’s (or file’s) modified time may have lower
        // resolution based on the filesystem (for example ext3
        // only stores integer seconds), kernel (see
        // https://stackoverflow.com/a/14393315/1162888), etc.
        let directory_mtime = if let Ok(option) =
            TruncatedTimestamp::for_reliable_mtime_of(
                directory_metadata,
                status_start,
            ) {
            if let Some(directory_mtime) = option {
                directory_mtime
            } else {
                // The directory was modified too recently,
                // don’t cache its `read_dir` results.
                //
                // 1. A change to this directory (direct child was
                //    added or removed) cause its mtime to be set
                //    (possibly truncated) to `directory_mtime`
                // 2. This `status` algorithm calls `read_dir`
                // 3. An other change is made to the same directory is
                //    made so that calling `read_dir` agin would give
                //    different results, but soon enough after 1. that
                //    the mtime stays the same
                //
                // On a system where the time resolution poor, this
                // scenario is not unlikely if all three steps are caused
                // by the same script.
                return Ok(());
            }
        } else {
            // OS/libc does not support mtime?
            return Ok(());
        };
        // We’ve observed (through `status_start`) that time has
        // “progressed” since `directory_mtime`, so any further
        // change to this directory is extremely likely to cause a
        // different mtime.
        //
        // Having the same mtime again is not entirely impossible
        // since the system clock is not monotonous. It could jump
        // backward to some point before `directory_mtime`, then a
        // directory change could potentially happen during exactly
        // the wrong tick.
        //
        // We deem this scenario (unlike the previous one) to be
        // unlikely enough in practice.

        let is_up_to_date = if let Some(cached) =
            dirstate_node.cached_directory_mtime()?
        {
            !outdated_directory_cache && cached.likely_equal(directory_mtime)
        } else {
            false
        };
        if !is_up_to_date {
            let hg_path = dirstate_node
                .full_path_borrowed(self.dmap.on_disk)?
                .detach_from_tree();
            self.new_cacheable_directories
                .lock()
                .unwrap()
                .push((hg_path, directory_mtime))
        }
        Ok(())
    }

    /// A file that is clean in the dirstate was found in the filesystem
    fn handle_normal_file(
        &self,
        dirstate_node: &NodeRef<'tree, 'on_disk>,
        fs_metadata: &std::fs::Metadata,
    ) -> Result<(), DirstateV2ParseError> {
        // Keep the low 31 bits
        fn truncate_u64(value: u64) -> i32 {
            (value & 0x7FFF_FFFF) as i32
        }

        let entry = dirstate_node
            .entry()?
            .expect("handle_normal_file called with entry-less node");
        let mode_changed =
            || self.options.check_exec && entry.mode_changed(fs_metadata);
        let size = entry.size();
        let size_changed = size != truncate_u64(fs_metadata.len());
        if size >= 0 && size_changed && fs_metadata.file_type().is_symlink() {
            // issue6456: Size returned may be longer due to encryption
            // on EXT-4 fscrypt. TODO maybe only do it on EXT4?
            self.push_outcome(Outcome::Unsure, dirstate_node)?
        } else if dirstate_node.has_copy_source()
            || entry.is_from_other_parent()
            || (size >= 0 && (size_changed || mode_changed()))
        {
            self.push_outcome(Outcome::Modified, dirstate_node)?
        } else {
            let mtime_looks_clean;
            if let Some(dirstate_mtime) = entry.truncated_mtime() {
                let fs_mtime = TruncatedTimestamp::for_mtime_of(fs_metadata)
                    .expect("OS/libc does not support mtime?");
                // There might be a change in the future if for example the
                // internal clock become off while process run, but this is a
                // case where the issues the user would face
                // would be a lot worse and there is nothing we
                // can really do.
                mtime_looks_clean = fs_mtime.likely_equal(dirstate_mtime)
            } else {
                // No mtime in the dirstate entry
                mtime_looks_clean = false
            };
            if !mtime_looks_clean {
                self.push_outcome(Outcome::Unsure, dirstate_node)?
            } else if self.options.list_clean {
                self.push_outcome(Outcome::Clean, dirstate_node)?
            }
        }
        Ok(())
    }

    /// A node in the dirstate tree has no corresponding filesystem entry
    fn traverse_dirstate_only(
        &self,
        dirstate_node: NodeRef<'tree, 'on_disk>,
    ) -> Result<(), DirstateV2ParseError> {
        self.check_for_outdated_directory_cache(&dirstate_node)?;
        self.mark_removed_or_deleted_if_file(&dirstate_node)?;
        dirstate_node
            .children(self.dmap.on_disk)?
            .par_iter()
            .map(|child_node| self.traverse_dirstate_only(child_node))
            .collect()
    }

    /// A node in the dirstate tree has no corresponding *file* on the
    /// filesystem
    ///
    /// Does nothing on a "directory" node
    fn mark_removed_or_deleted_if_file(
        &self,
        dirstate_node: &NodeRef<'tree, 'on_disk>,
    ) -> Result<(), DirstateV2ParseError> {
        if let Some(entry) = dirstate_node.entry()? {
            if !entry.any_tracked() {
                // Future-compat for when we start storing ignored and unknown
                // files for caching reasons
                return Ok(());
            }
            let path = dirstate_node.full_path(self.dmap.on_disk)?;
            if self.matcher.matches(path) {
                if entry.removed() {
                    self.push_outcome(Outcome::Removed, dirstate_node)?
                } else {
                    self.push_outcome(Outcome::Deleted, &dirstate_node)?
                }
            }
        }
        Ok(())
    }

    /// Something in the filesystem has no corresponding dirstate node
    ///
    /// Returns whether that path is ignored
    fn traverse_fs_only(
        &self,
        has_ignored_ancestor: bool,
        directory_hg_path: &HgPath,
        fs_entry: &DirEntry,
    ) -> bool {
        let hg_path = directory_hg_path.join(&fs_entry.base_name);
        let file_type = fs_entry.metadata.file_type();
        let file_or_symlink = file_type.is_file() || file_type.is_symlink();
        if file_type.is_dir() {
            let is_ignored =
                has_ignored_ancestor || (self.ignore_fn)(&hg_path);
            let traverse_children = if is_ignored {
                // Descendants of an ignored directory are all ignored
                self.options.list_ignored
            } else {
                // Descendants of an unknown directory may be either unknown or
                // ignored
                self.options.list_unknown || self.options.list_ignored
            };
            if traverse_children {
                let is_at_repo_root = false;
                if let Ok(children_fs_entries) = self.read_dir(
                    &hg_path,
                    &fs_entry.full_path,
                    is_at_repo_root,
                ) {
                    children_fs_entries.par_iter().for_each(|child_fs_entry| {
                        self.traverse_fs_only(
                            is_ignored,
                            &hg_path,
                            child_fs_entry,
                        );
                    })
                }
                if self.options.collect_traversed_dirs {
                    self.outcome.lock().unwrap().traversed.push(hg_path.into())
                }
            }
            is_ignored
        } else {
            if file_or_symlink {
                if self.matcher.matches(&hg_path) {
                    self.mark_unknown_or_ignored(
                        has_ignored_ancestor,
                        &BorrowedPath::InMemory(&hg_path),
                    )
                } else {
                    // We haven’t computed whether this path is ignored. It
                    // might not be, and a future run of status might have a
                    // different matcher that matches it. So treat it as not
                    // ignored. That is, inhibit readdir caching of the parent
                    // directory.
                    false
                }
            } else {
                // This is neither a directory, a plain file, or a symlink.
                // Treat it like an ignored file.
                true
            }
        }
    }

    /// Returns whether that path is ignored
    fn mark_unknown_or_ignored(
        &self,
        has_ignored_ancestor: bool,
        hg_path: &BorrowedPath<'_, 'on_disk>,
    ) -> bool {
        let is_ignored = has_ignored_ancestor || (self.ignore_fn)(&hg_path);
        if is_ignored {
            if self.options.list_ignored {
                self.push_outcome_without_copy_source(
                    Outcome::Ignored,
                    hg_path,
                )
            }
        } else {
            if self.options.list_unknown {
                self.push_outcome_without_copy_source(
                    Outcome::Unknown,
                    hg_path,
                )
            }
        }
        is_ignored
    }
}

struct DirEntry {
    base_name: HgPathBuf,
    full_path: PathBuf,
    metadata: std::fs::Metadata,
}

impl DirEntry {
    /// Returns **unsorted** entries in the given directory, with name and
    /// metadata.
    ///
    /// If a `.hg` sub-directory is encountered:
    ///
    /// * At the repository root, ignore that sub-directory
    /// * Elsewhere, we’re listing the content of a sub-repo. Return an empty
    ///   list instead.
    fn read_dir(path: &Path, is_at_repo_root: bool) -> io::Result<Vec<Self>> {
        // `read_dir` returns a "not found" error for the empty path
        let at_cwd = path == Path::new("");
        let read_dir_path = if at_cwd { Path::new(".") } else { path };
        let mut results = Vec::new();
        for entry in read_dir_path.read_dir()? {
            let entry = entry?;
            let metadata = match entry.metadata() {
                Ok(v) => v,
                Err(e) => {
                    // race with file deletion?
                    if e.kind() == std::io::ErrorKind::NotFound {
                        continue;
                    } else {
                        return Err(e);
                    }
                }
            };
            let file_name = entry.file_name();
            // FIXME don't do this when cached
            if file_name == ".hg" {
                if is_at_repo_root {
                    // Skip the repo’s own .hg (might be a symlink)
                    continue;
                } else if metadata.is_dir() {
                    // A .hg sub-directory at another location means a subrepo,
                    // skip it entirely.
                    return Ok(Vec::new());
                }
            }
            let full_path = if at_cwd {
                file_name.clone().into()
            } else {
                entry.path()
            };
            let base_name = get_bytes_from_os_string(file_name).into();
            results.push(DirEntry {
                base_name,
                full_path,
                metadata,
            })
        }
        Ok(results)
    }
}

/// Return the `mtime` of a temporary file newly-created in the `.hg` directory
/// of the give repository.
///
/// This is similar to `SystemTime::now()`, with the result truncated to the
/// same time resolution as other files’ modification times. Using `.hg`
/// instead of the system’s default temporary directory (such as `/tmp`) makes
/// it more likely the temporary file is in the same disk partition as contents
/// of the working directory, which can matter since different filesystems may
/// store timestamps with different resolutions.
///
/// This may fail, typically if we lack write permissions. In that case we
/// should continue the `status()` algoritm anyway and consider the current
/// date/time to be unknown.
fn filesystem_now(repo_root: &Path) -> Result<SystemTime, io::Error> {
    tempfile::tempfile_in(repo_root.join(".hg"))?
        .metadata()?
        .modified()
}