OXYGENHUB
# 84b9e9ac0ab4 oxygen / crates / oxy-core / src / repo / mod.rs
43.1 KiB · Rust · last changed Host API: changes from an edit set, delegate-signed reference updates 1 month ago source blame history raw
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//! A repository on disk: the `.oxy` directory, one workspace, the operation
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//! log, and the working-copy change (spec §12, §13.1).
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//!
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//! Not yet implemented from the spec: packs, checkpoints, multiple
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//! workspaces, multi-signer policy updates, and the `objects`/`checkpoint`
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//! endpoints. A repository without a policy is unverified and accepts
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//! unsigned pushes; with one, everything received is checked (spec §14.5). Changes are signed individually when `core.sign` is
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//! `change`; the default `seal` leaves them unsigned until push exists.
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use crate::attest::{Attest, AttestBody};
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use crate::diff::{ranges, split_lines, text_edits};
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use crate::hash::{hash_object, ChangeHash, KeyId, ObjectRef, ObjectType};
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use crate::identity::{verify as verify_signature, Domain, Identity, SecretKey, Signature};
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use crate::ids::{ChangeId, NodeId, WorkspaceId};
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use crate::objects::{
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    Blob, Change, ChangeKind, Edit, Hlc, Mode, NodeKind, OpRef, StateObject, TreeOp,
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};
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use crate::oplog::{Format1Op, Op, View, SNAPSHOT_SUFFIX};
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use crate::protocol::{
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    open_remote, Bundle, RefResult, RefUpdate, RefsResponse, RemoteOptions, RemoteRef,
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    SignedAttest, SignedPolicy,
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};
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use crate::state::{FileContent, Snapshot, State};
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use crate::store::{Store, StoreError};
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#[allow(unused_imports)]
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use crate::subrepo::Pin;
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use crate::tree::OpKey;
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use rand::RngCore;
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use std::collections::{BTreeMap, BTreeSet, HashMap};
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use std::fs;
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use std::io::Write;
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use std::path::{Path, PathBuf};
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pub const OXY_DIR: &str = ".oxy";
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pub const FORMAT_LINE: &str = "oxy repository format 2\n";
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const FORMAT1_LINE: &str = "oxy repository format 1\n";
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const BINARY_SNIFF: usize = 8 * 1024;
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/// Loose objects tolerated before a commit packs them (spec §13.4).
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pub const AUTOPACK_THRESHOLD: usize = 4096;
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#[derive(Debug, thiserror::Error)]
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pub enum RepoError {
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    #[error("io: {0}")]
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    Io(#[from] std::io::Error),
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    #[error(transparent)]
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    Store(#[from] StoreError),
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    #[error(transparent)]
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    Object(#[from] crate::objects::ObjectError),
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    #[error(transparent)]
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    State(#[from] crate::state::StateError),
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    #[error("{0}")]
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    Msg(String),
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}
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pub type Result<T> = std::result::Result<T, RepoError>;
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fn fail<T>(s: impl Into<String>) -> Result<T> {
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    Err(RepoError::Msg(s.into()))
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}
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mod bookmarks;
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mod checkout;
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mod checkpoint;
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mod config;
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mod gc;
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mod git;
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mod history;
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mod hooks;
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mod hosted;
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mod identity;
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mod inspect;
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mod policy;
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mod prompt;
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mod snapshot;
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mod subrepos;
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mod sync;
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mod tags;
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#[cfg(test)]
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mod tests;
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mod workspace;
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pub use bookmarks::{BookmarkInfo, MergeReport};
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pub use checkout::CheckoutReport;
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pub use config::{parse_size, read_config_file, Config};
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pub use gc::GcReport;
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pub use git::{GitExportReport, GitImportReport};
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pub use hooks::{json_array, json_str, HookOutcome};
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pub use hosted::FileEdit;
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pub use identity::{Rotation, SignatureStatus};
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pub use inspect::{BisectStep, BlameLine};
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pub use policy::PolicyUpdate;
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pub use prompt::{PromptInfo, DEFAULT_PROMPT_FORMAT, GLYPH_PROMPT_FORMAT};
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pub use snapshot::{
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    added_node_paths, diff_files_of, has_conflict_markers, is_binary, referenced_changes,
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    render_change, render_hunks, similarity, ChangeStatus, DiffHunk, FileDiff, Hunk, PathStatus,
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    Selection, SnapshotResult,
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};
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pub use subrepos::{SubrepoInfo, SubrepoSync};
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pub use sync::{FetchReport, PullReport, PushReport, RefUpdated};
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pub use tags::TagInfo;
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pub use workspace::{SnapshotLock, WorkspaceInfo};
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fn write_atomic(path: &Path, data: &[u8]) -> Result<()> {
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    let tmp = path.with_extension("tmp");
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    {
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        let mut f = fs::File::create(&tmp)?;
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        f.write_all(data)?;
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        f.sync_all()?;
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    }
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    fs::rename(&tmp, path)?;
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    Ok(())
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}
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pub struct LogEntry {
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    pub hash: ChangeHash,
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    /// Metadata from the state; the full change may be absent in a shallow repository.
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    pub change: crate::state::ChangeMeta,
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    pub is_working_copy: bool,
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    pub is_head: bool,
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}
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/// A file as found on disk or in an imported tree.
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pub(crate) struct FsEntry {
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    pub kind: NodeKind,
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    pub exec: bool,
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    /// File content, or a symlink's target. Empty when `blob` is set.
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    pub content: Vec<u8>,
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    /// The stored blob of an opaque file whose size and mtime are unchanged
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    /// since the last manifest (spec §12.3 stat cache); the content was not
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    /// read.
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    pub blob: Option<ObjectRef>,
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    /// BLAKE3 of the content, carried over from the manifest when the stat
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    /// is unchanged, so the manifest can be rewritten without rehashing.
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    pub content_hash: Option<String>,
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}
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impl FsEntry {
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    pub(crate) fn new(kind: NodeKind, exec: bool, content: Vec<u8>) -> FsEntry {
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        FsEntry {
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            kind,
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            exec,
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            content,
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            blob: None,
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            content_hash: None,
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        }
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    }
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}
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pub struct Repo {
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    /// Oxygen-pinned subrepos skipped by the running Git export.
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    pub(crate) git_export_skipped: std::cell::Cell<usize>,
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    root: PathBuf,
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    oxy: PathBuf,
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    store: Store,
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    workspace: WorkspaceId,
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    /// A hosted repository with no working copy (spec §12.2, hub spec §4.1).
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    bare: bool,
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    keys_dir: PathBuf,
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    user_config: PathBuf,
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    pub config: Config,
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}
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/// Marker file of a bare repository, inside `.oxy/`.
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const BARE_MARKER: &str = "bare";
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/// Marker of a hosted repository that has no id yet: the first push binds
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/// it to the pusher's id (spec §16.1).
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const UNBOUND_MARKER: &str = "unbound";
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/// The user's oxy directory: `$OXY_HOME`, else `$XDG_CONFIG_HOME/oxy`, else
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/// `~/.config/oxy`. It holds `config.toml` (spec §19) and `keys/`.
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pub fn default_home() -> PathBuf {
172 
    if let Ok(h) = std::env::var("OXY_HOME") {
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        return PathBuf::from(h);
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    }
175 
    if let Ok(x) = std::env::var("XDG_CONFIG_HOME") {
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        return PathBuf::from(x).join("oxy");
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    }
178 
    let home = std::env::var("HOME").unwrap_or_else(|_| ".".into());
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    PathBuf::from(home).join(".config").join("oxy")
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}
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pub fn default_keys_dir() -> PathBuf {
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    default_home().join("keys")
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}
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pub fn default_user_config() -> PathBuf {
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    default_home().join("config.toml")
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}
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/// Where `create_identity` records the author.
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#[derive(Clone, Copy, Debug, PartialEq, Eq)]
192 
pub enum IdentityScope {
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    /// The user file: every repository of this user signs with it.
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    User,
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    /// This repository only.
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    Repo,
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}
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impl Repo {
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    // ------------------------------------------------------------ lifecycle
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    pub fn init(root: &Path) -> Result<Repo> {
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        let mut id = [0u8; 16];
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        rand::rngs::OsRng.fill_bytes(&mut id);
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        Self::init_with_id(root, id)
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    }
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    /// Initialize a repository with a given repository ID (clones share the
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    /// ID of their origin, spec §14.4).
210 
    pub fn init_with_id(root: &Path, id: [u8; 16]) -> Result<Repo> {
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        fs::create_dir_all(root)?;
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        let root = root.canonicalize().unwrap_or_else(|_| root.to_path_buf());
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        let oxy = root.join(OXY_DIR);
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        if oxy.exists() {
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            return fail(format!("{} is already an oxy repository", root.display()));
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        }
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        fs::create_dir_all(oxy.join("ops"))?;
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        write_atomic(&oxy.join("format"), FORMAT_LINE.as_bytes())?;
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        write_atomic(&oxy.join("id"), hex::encode(id).as_bytes())?;
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        let config = Config::load(Some(&default_user_config()), &oxy.join("config"))?;
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        config.save(&oxy.join("config"))?;
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        let workspace = WorkspaceId::random();
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        write_atomic(&oxy.join("workspace"), workspace.to_hex().as_bytes())?;
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        let store = Store::open(oxy.join("objects"))?;
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        let repo = Repo {
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            git_export_skipped: Default::default(),
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            root,
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            oxy,
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            store,
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            workspace,
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            bare: false,
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            keys_dir: default_keys_dir(),
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            user_config: default_user_config(),
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            config,
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        };
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        repo.register_workspace(&workspace, &repo.root)?;
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238 
        let wc = repo.new_working_copy(vec![], "");
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        let wc_hash = repo.store.put_change(&wc)?;
240 
        let mut view = View::default();
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        view.bookmarks.insert(
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            repo.config.bookmark.clone(),
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            repo.store.put_state(&StateObject::new(vec![]))?,
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        );
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        view.workspaces.insert(workspace, wc_hash);
246 
        repo.record_op(&[], "oxy init", view)?;
247 
        Ok(repo)
248 
    }
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    /// Create a bare repository: an object store, operation log and
251 
    /// references with no workspace and no working copy, for hosting
252 
    /// (hub spec §4.1). `root` holds `.oxy/` and nothing else.
253 
    pub fn init_bare(root: &Path) -> Result<Repo> {
254 
        let mut id = [0u8; 16];
255 
        rand::rngs::OsRng.fill_bytes(&mut id);
256 
        Self::init_bare_with_id(root, id)
257 
    }
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259 
    pub fn init_bare_with_id(root: &Path, id: [u8; 16]) -> Result<Repo> {
260 
        fs::create_dir_all(root)?;
261 
        let root = root.canonicalize().unwrap_or_else(|_| root.to_path_buf());
262 
        let oxy = root.join(OXY_DIR);
263 
        if oxy.exists() {
264 
            return fail(format!("{} is already an oxy repository", root.display()));
265 
        }
266 
        fs::create_dir_all(oxy.join("ops"))?;
267 
        write_atomic(&oxy.join("format"), FORMAT_LINE.as_bytes())?;
268 
        write_atomic(&oxy.join("id"), hex::encode(id).as_bytes())?;
269 
        write_atomic(&oxy.join(BARE_MARKER), b"")?;
270 
        let config = Config::load(Some(&default_user_config()), &oxy.join("config"))?;
271 
        config.save(&oxy.join("config"))?;
272 
        let store = Store::open(oxy.join("objects"))?;
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        let repo = Repo {
274 
            git_export_skipped: Default::default(),
275 
            root,
276 
            oxy,
277 
            store,
278 
            workspace: WorkspaceId::ZERO,
279 
            bare: true,
280 
            keys_dir: default_keys_dir(),
281 
            user_config: default_user_config(),
282 
            config,
283 
        };
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        let mut view = View::default();
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        view.bookmarks.insert(
286 
            repo.config.bookmark.clone(),
287 
            repo.store.put_state(&StateObject::new(vec![]))?,
288 
        );
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        repo.record_op(&[], "oxy init --bare", view)?;
290 
        Ok(repo)
291 
    }
292
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    /// A bare repository with no id yet. Its `id()` is all zero until the
294 
    /// first push binds it (`bind_id`), so an existing repository can be
295 
    /// pushed to a freshly created hosted one and keep its identity.
296 
    pub fn init_bare_unbound(root: &Path) -> Result<Repo> {
297 
        let repo = Self::init_bare_with_id(root, [0; 16])?;
298 
        fs::remove_file(repo.oxy.join("id"))?;
299 
        write_atomic(&repo.oxy.join(UNBOUND_MARKER), b"")?;
300 
        Ok(repo)
301 
    }
302
303 
    pub fn is_unbound(&self) -> bool {
304 
        self.oxy.join(UNBOUND_MARKER).is_file()
305 
    }
306
307 
    /// Give an unbound repository its id.
308 
    pub fn bind_id(&self, id: [u8; 16]) -> Result<()> {
309 
        if !self.is_unbound() {
310 
            return fail("this repository already has an id");
311 
        }
312 
        if id == [0; 16] {
313 
            return fail("a repository id cannot be all zero");
314 
        }
315 
        write_atomic(&self.oxy.join("id"), hex::encode(id).as_bytes())?;
316 
        fs::remove_file(self.oxy.join(UNBOUND_MARKER))?;
317 
        Ok(())
318 
    }
319
e02bf0cd Andy McCall ↶ 320 
    /// Whether this repository has no working copy (`init_bare`).
321 
    pub fn is_bare(&self) -> bool {
322 
        self.bare
323 
    }
324
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    /// Open the repository containing `start` (searching upwards).
326 
    pub fn open(start: &Path) -> Result<Repo> {
327 
        let start = start.canonicalize()?;
328 
        let mut dir: Option<&Path> = Some(&start);
329 
        while let Some(d) = dir {
330 
            let oxy = d.join(OXY_DIR);
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            if oxy.is_file() {
332 
                // A secondary workspace (spec §12.2): the file points at the repository.
333 
                let text = fs::read_to_string(&oxy)?;
334 
                let Some((shared, workspace)) = workspace::parse_workspace_file(&text) else {
335 
                    return fail(format!("{} is not a valid workspace file", oxy.display()));
336 
                };
337 
                let format = fs::read_to_string(shared.join("format"))?;
338 
                if format != FORMAT_LINE {
339 
                    return fail(format!("unsupported repository format: {}", format.trim()));
340 
                }
341 
                let config = Config::load(Some(&default_user_config()), &shared.join("config"))?;
342 
                let store = Store::open(shared.join("objects"))?;
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                let mut repo = Repo {
344 
                    git_export_skipped: Default::default(),
345 
                    root: d.to_path_buf(),
346 
                    oxy: shared,
347 
                    store,
348 
                    workspace,
349 
                    bare: false,
350 
                    keys_dir: default_keys_dir(),
351 
                    user_config: default_user_config(),
352 
                    config,
353 
                };
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                repo.apply_workspace_bookmark();
355 
                return Ok(repo);
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            }
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            if oxy.is_dir() {
358 
                let format = fs::read_to_string(oxy.join("format"))?;
359 
                let config = Config::load(Some(&default_user_config()), &oxy.join("config"))?;
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                let bare = oxy.join(BARE_MARKER).is_file();
361 
                let workspace = if bare {
362 
                    WorkspaceId::ZERO
363 
                } else {
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                    WorkspaceId::from_hex(fs::read_to_string(oxy.join("workspace"))?.trim())
365 
                        .ok_or_else(|| RepoError::Msg("corrupt .oxy/workspace".into()))?
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                };
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                let store = Store::open(oxy.join("objects"))?;
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                let mut repo = Repo {
369 
                    git_export_skipped: Default::default(),
370 
                    root: d.to_path_buf(),
371 
                    oxy,
372 
                    store,
373 
                    workspace,
374 
                    bare,
375 
                    keys_dir: default_keys_dir(),
376 
                    user_config: default_user_config(),
377 
                    config,
378 
                };
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                if !bare {
380 
                    repo.apply_workspace_bookmark();
381 
                }
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                if format == FORMAT1_LINE {
383 
                    repo.migrate_format1()?;
384 
                } else if format != FORMAT_LINE {
385 
                    return fail(format!("unsupported repository format: {}", format.trim()));
386 
                }
387 
                return Ok(repo);
388 
            }
389 
            dir = d.parent();
390 
        }
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        fail(format!(
392 
            "no oxy repository found at or above {}",
393 
            start.display()
394 
        ))
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    }
396
397 
    /// Rewrite a format-1 operation log, whose bookmarks were head lists,
398 
    /// into format 2, where each bookmark names a `state` object.
399 
    fn migrate_format1(&self) -> Result<()> {
400 
        let hex = fs::read_to_string(self.oxy.join("ops").join("head"))?;
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        let head = ObjectRef::from_hex(hex.trim())
402 
            .ok_or_else(|| RepoError::Msg("corrupt .oxy/ops/head".into()))?;
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        // Collect the chain root-first.
404 
        let mut chain: Vec<Format1Op> = Vec::new();
405 
        let mut cur = Some(head);
406 
        while let Some(r) = cur {
407 
            let op = Op::decode_format1(&self.store.get_typed(&r, ObjectType::Op)?)?;
408 
            cur = op.parents.first().copied();
409 
            chain.push(op);
410 
        }
411 
        chain.reverse();
412 
        let mut new_parent: Option<ObjectRef> = None;
413 
        for old in chain {
414 
            let mut view = View::default();
415 
            for (name, heads) in &old.view.bookmarks {
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                view.bookmarks.insert(
417 
                    name.clone(),
418 
                    self.store.put_state(&StateObject::new(heads.clone()))?,
419 
                );
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            }
421 
            view.workspaces = old.view.workspaces.clone();
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            let op = Op {
423 
                parents: new_parent.into_iter().collect(),
424 
                hlc: old.hlc,
425 
                command: old.command,
426 
                view,
427 
            };
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            new_parent = Some(self.store.put(ObjectType::Op, &op.encode())?);
429 
        }
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        write_atomic(
431 
            &self.oxy.join("ops").join("head"),
432 
            new_parent.unwrap().to_hex().as_bytes(),
433 
        )?;
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        write_atomic(&self.oxy.join("format"), FORMAT_LINE.as_bytes())?;
435 
        Ok(())
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    }
437
438 
    /// Pack automatically once many loose objects have accumulated.
439 
    pub(crate) fn maybe_autopack(&self) -> Result<()> {
440 
        if self.store.loose_count()? > AUTOPACK_THRESHOLD {
441 
            self.store.pack_loose()?;
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            self.store.merge_packs()?;
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        }
444 
        Ok(())
445 
    }
446
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    /// The repository ID (spec §14.4). Repositories made before IDs existed get one on first use.
448 
    pub fn id(&self) -> Result<[u8; 16]> {
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        if self.is_unbound() {
450 
            return Ok([0; 16]);
451 
        }
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        let path = self.oxy.join("id");
453 
        match fs::read_to_string(&path) {
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            Ok(h) => hex::decode(h.trim())
455 
                .ok()
456 
                .and_then(|v| v.try_into().ok())
457 
                .ok_or_else(|| RepoError::Msg("corrupt .oxy/id".into())),
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            Err(e) if e.kind() == std::io::ErrorKind::NotFound => {
459 
                let mut id = [0u8; 16];
460 
                rand::rngs::OsRng.fill_bytes(&mut id);
461 
                write_atomic(&path, hex::encode(id).as_bytes())?;
462 
                Ok(id)
463 
            }
464 
            Err(e) => Err(e.into()),
465 
        }
466 
    }
467
468 
    pub fn root(&self) -> &Path {
469 
        &self.root
470 
    }
471 
    pub fn store(&self) -> &Store {
472 
        &self.store
473 
    }
474 
    pub fn workspace(&self) -> WorkspaceId {
475 
        self.workspace
476 
    }
477
478 
    /// Use a different user directory for keys and the user config file
479 
    /// (tests, or `$OXY_HOME`). Reloads the effective configuration.
480 
    pub fn with_home(mut self, dir: impl Into<PathBuf>) -> Repo {
481 
        let dir = dir.into();
482 
        self.keys_dir = dir.join("keys");
483 
        self.user_config = dir.join("config.toml");
484 
        if let Ok(c) = Config::load(Some(&self.user_config), &self.oxy.join("config")) {
485 
            self.config = c;
486 
        }
7b9809e6 Andy McCall ↶ 487 
        self.apply_workspace_bookmark();
98286406 Andy McCall ↶ 488 
        self
489 
    }
490
7b9809e6 Andy McCall ↶ 491 
    /// The workspace's current bookmark (spec §10.1) overrides the
492 
    /// configured default when `oxy bookmark switch` has recorded one.
493 
    fn apply_workspace_bookmark(&mut self) {
75167672 Andy McCall 494 
        if let Ok(b) = fs::read_to_string(
495 
            self.oxy
496 
                .join("workspaces")
497 
                .join(self.workspace.to_hex())
498 
                .join("bookmark"),
499 
        ) {
7b9809e6 Andy McCall ↶ 500 
            let b = b.trim();
501 
            if !b.is_empty() {
502 
                self.config.bookmark = b.to_string();
503 
            }
504 
        }
505 
    }
506
98286406 Andy McCall ↶ 507 
    pub fn user_config_path(&self) -> &Path {
508 
        &self.user_config
509 
    }
510
511 
    /// Set a key in the user file and refresh the effective configuration.
512 
    pub fn set_user_config(&mut self, key: &str, value: &str) -> Result<()> {
513 
        Config::set_user(&self.user_config, key, value)?;
514 
        self.config = Config::load(Some(&self.user_config), &self.oxy.join("config"))?;
515 
        Ok(())
516 
    }
517
518 
    pub fn save_config(&self) -> Result<()> {
519 
        self.config.save(&self.oxy.join("config"))
520 
    }
521
522 
    fn author(&self) -> KeyId {
523 
        self.config.author_key.unwrap_or(ObjectRef::ZERO)
524 
    }
525 
}
526
527 
impl Repo {
528 
    fn new_working_copy(&self, deps: Vec<ChangeHash>, message: &str) -> Change {
529 
        let mut c = Change {
530 
            change_id: ChangeId::random(),
531 
            deps,
532 
            author: self.author(),
533 
            hlc: Hlc::now(),
534 
            message: message.into(),
535 
            tree_ops: vec![],
536 
            edits: vec![],
537 
            kind: ChangeKind::WorkingCopy,
538 
        };
539 
        c.normalize();
540 
        c
541 
    }
542
543 
    // ------------------------------------------------------------ operation log
544
545 
    pub fn head_op(&self) -> Result<(ObjectRef, Op)> {
546 
        let hex = fs::read_to_string(self.oxy.join("ops").join("head"))?;
75167672 Andy McCall 547 
        let r = ObjectRef::from_hex(hex.trim())
548 
            .ok_or_else(|| RepoError::Msg("corrupt .oxy/ops/head".into()))?;
98286406 Andy McCall ↶ 549 
        let op = Op::decode(&self.store.get_typed(&r, ObjectType::Op)?)?;
550 
        Ok((r, op))
551 
    }
552
553 
    pub fn view(&self) -> Result<View> {
554 
        Ok(self.head_op()?.1.view)
555 
    }
556
557 
    fn record_op(&self, parents: &[ObjectRef], command: &str, view: View) -> Result<ObjectRef> {
75167672 Andy McCall 558 
        let op = Op {
559 
            parents: parents.to_vec(),
560 
            hlc: Hlc::now(),
561 
            command: command.into(),
562 
            view,
563 
        };
98286406 Andy McCall ↶ 564 
        let r = self.store.put(ObjectType::Op, &op.encode())?;
565 
        write_atomic(&self.oxy.join("ops").join("head"), r.to_hex().as_bytes())?;
566 
        Ok(r)
567 
    }
568
569 
    pub fn op_log(&self) -> Result<Vec<(ObjectRef, Op)>> {
570 
        let mut out = Vec::new();
571 
        let (mut r, mut op) = self.head_op()?;
572 
        loop {
573 
            let next = op.parents.first().copied();
574 
            out.push((r, op));
575 
            match next {
576 
                Some(p) => {
577 
                    r = p;
578 
                    op = Op::decode(&self.store.get_typed(&r, ObjectType::Op)?)?;
579 
                }
580 
                None => break,
581 
            }
582 
        }
583 
        Ok(out)
584 
    }
585
586 
    /// Undo the last user command (spec §12.1). Operations that only recorded
587 
    /// a working-copy snapshot are skipped, since the files are still on disk
588 
    /// and the next snapshot recreates them.
589 
    pub fn undo(&self) -> Result<Op> {
590 
        let (_, mut op) = self.head_op()?;
591 
        while op.is_snapshot() {
75167672 Andy McCall 592 
            let Some(parent) = op.parents.first() else {
593 
                break;
594 
            };
98286406 Andy McCall ↶ 595 
            op = Op::decode(&self.store.get_typed(parent, ObjectType::Op)?)?;
596 
        }
597 
        let Some(parent) = op.parents.first() else {
598 
            return fail("nothing to undo");
599 
        };
600 
        let parent_op = Op::decode(&self.store.get_typed(parent, ObjectType::Op)?)?;
75167672 Andy McCall 601 
        write_atomic(
602 
            &self.oxy.join("ops").join("head"),
603 
            parent.to_hex().as_bytes(),
604 
        )?;
135212de Andy McCall ↶ 605 
        self.drop_manifest();
98286406 Andy McCall ↶ 606 
        Ok(parent_op)
607 
    }
608
609 
    /// The last operation that was not a snapshot.
610 
    pub fn last_command(&self) -> Result<Op> {
611 
        let (_, mut op) = self.head_op()?;
612 
        while op.is_snapshot() {
75167672 Andy McCall 613 
            let Some(parent) = op.parents.first() else {
614 
                break;
615 
            };
98286406 Andy McCall ↶ 616 
            op = Op::decode(&self.store.get_typed(parent, ObjectType::Op)?)?;
617 
        }
618 
        Ok(op)
619 
    }
620
621 
    // ------------------------------------------------------------ states
622
252e8cb2 Andy McCall ↶ 623 
    /// Load the dependency closure of `heads`, through a checkpoint when one applies.
98286406 Andy McCall ↶ 624 
    pub fn load_state(&self, heads: &[ChangeHash]) -> Result<State> {
252e8cb2 Andy McCall ↶ 625 
        if let Some(st) = self.load_state_checkpointed(heads)? {
626 
            return Ok(st);
627 
        }
628 
        self.load_state_full(heads)
629 
    }
630
631 
    /// Load the dependency closure of `heads` change by change.
632 
    pub fn load_state_full(&self, heads: &[ChangeHash]) -> Result<State> {
98286406 Andy McCall ↶ 633 
        let mut state = State::new();
634 
        let mut stack: Vec<ChangeHash> = heads.to_vec();
635 
        let mut seen: BTreeSet<ChangeHash> = BTreeSet::new();
636 
        while let Some(h) = stack.pop() {
637 
            if !seen.insert(h) {
638 
                continue;
639 
            }
640 
            let c = self.store.get_change(&h)?;
641 
            stack.extend(c.deps.iter().copied());
642 
            state.add_unchecked(c);
643 
        }
644 
        state.validate()?;
645 
        Ok(state)
646 
    }
647
648 
    pub fn working_copy(&self) -> Result<(ChangeHash, Change)> {
e02bf0cd Andy McCall ↶ 649 
        if self.bare {
650 
            return fail("this is a bare repository: it has no working copy");
651 
        }
98286406 Andy McCall ↶ 652 
        let view = self.view()?;
653 
        let h = *view
654 
            .workspaces
655 
            .get(&self.workspace)
656 
            .ok_or_else(|| RepoError::Msg("this workspace is not in the current view".into()))?;
657 
        Ok((h, self.store.get_change(&h)?))
658 
    }
659
660 
    /// Heads of a bookmark's state (spec §10.1).
661 
    pub fn heads_of(&self, view: &View, bookmark: &str) -> Result<Vec<ChangeHash>> {
662 
        match view.bookmarks.get(bookmark) {
663 
            Some(st) => Ok(self.store.get_state(st)?.heads),
664 
            None => Ok(vec![]),
665 
        }
666 
    }
667
668 
    pub fn bookmark_heads(&self) -> Result<Vec<ChangeHash>> {
669 
        self.heads_of(&self.view()?, &self.config.bookmark)
670 
    }
671
672 
    // ------------------------------------------------------------ blobs
673
674 
    fn blob_for(content: &[u8]) -> Blob {
675 
        Blob {
676 
            length: content.len() as u64,
75167672 Andy McCall 677 
            chunks: crate::chunk::chunks(content)
678 
                .into_iter()
679 
                .map(|c| hash_object(ObjectType::Chunk, c))
680 
                .collect(),
98286406 Andy McCall ↶ 681 
        }
682 
    }
683
684 
    pub fn blob_ref(content: &[u8]) -> ObjectRef {
685 
        Self::blob_for(content).hash()
686 
    }
687
688 
    pub fn store_blob(&self, content: &[u8]) -> Result<ObjectRef> {
689 
        for c in crate::chunk::chunks(content) {
690 
            self.store.put_chunk(c)?;
691 
        }
75167672 Andy McCall 692 
        Ok(self
693 
            .store
694 
            .put(ObjectType::Blob, &Self::blob_for(content).encode())?)
98286406 Andy McCall ↶ 695 
    }
696
b3c5a59a Andy McCall ↶ 697 
    /// Read a blob's content, fetching it from the remote that withheld it
698 
    /// when it is lazily absent (spec §13.5).
98286406 Andy McCall ↶ 699 
    pub fn read_blob(&self, r: &ObjectRef) -> Result<Vec<u8>> {
b3c5a59a Andy McCall ↶ 700 
        if !self.store.has(r) && self.lazy_remote(r).is_some() {
701 
            self.fetch_lazy_blob(r)?;
702 
        }
98286406 Andy McCall ↶ 703 
        let blob = Blob::decode(&self.store.get_typed(r, ObjectType::Blob)?)?;
704 
        let mut out = Vec::with_capacity(blob.length as usize);
705 
        for c in &blob.chunks {
706 
            out.extend(self.store.get_typed(c, ObjectType::Chunk)?);
707 
        }
708 
        Ok(out)
709 
    }
710
711 
    // ------------------------------------------------------------ working copy
712
cdb5beba Andy McCall ↶ 713 
    /// Attributes from the `.oxyattributes` files in the working directory.
714 
    pub fn disk_attributes(&self) -> crate::attributes::Attributes {
715 
        let mut files: Vec<(String, Vec<u8>)> = Vec::new();
716 
        if let Ok(b) = fs::read(self.root.join(".oxyattributes")) {
717 
            files.push((".oxyattributes".into(), b));
718 
        }
719 
        let mut wb = ignore::WalkBuilder::new(&self.root);
75167672 Andy McCall 720 
        wb.hidden(false)
721 
            .git_ignore(false)
722 
            .git_global(false)
723 
            .git_exclude(false)
724 
            .require_git(false)
725 
            .follow_links(false)
726 
            .add_custom_ignore_filename(".oxyignore");
cdb5beba Andy McCall ↶ 727 
        wb.filter_entry(|e| e.file_name() != OXY_DIR);
728 
        for entry in wb.build().flatten() {
75167672 Andy McCall 729 
            if entry.file_name() == ".oxyattributes"
730 
                && entry.path() != self.root.join(".oxyattributes")
731 
            {
cdb5beba Andy McCall ↶ 732 
                if let Ok(b) = fs::read(entry.path()) {
75167672 Andy McCall 733 
                    let rel: String = entry
734 
                        .path()
735 
                        .strip_prefix(&self.root)
736 
                        .unwrap()
737 
                        .components()
738 
                        .map(|c| c.as_os_str().to_string_lossy().to_string())
739 
                        .collect::<Vec<_>>()
740 
                        .join("/");
cdb5beba Andy McCall ↶ 741 
                    files.push((rel, b));
742 
                }
743 
            }
744 
        }
75167672 Andy McCall 745 
        crate::attributes::Attributes::from_files(
746 
            files.iter().map(|(p, c)| (p.as_str(), c.as_slice())),
747 
        )
cdb5beba Andy McCall ↶ 748 
    }
749
750 
    /// Attributes from a materialized state's `.oxyattributes` files.
751 
    pub fn state_attributes(snapshot: &Snapshot) -> crate::attributes::Attributes {
75167672 Andy McCall 752 
        crate::attributes::Attributes::from_files(snapshot.files.iter().filter_map(|(p, f)| {
753 
            match &f.content {
754 
                FileContent::Text { bytes, .. }
755 
                    if p == ".oxyattributes" || p.ends_with("/.oxyattributes") =>
756 
                {
757 
                    Some((p.as_str(), bytes.as_slice()))
758 
                }
759 
                _ => None,
760 
            }
cdb5beba Andy McCall ↶ 761 
        }))
762 
    }
763
764 
    /// Store a blob, raw when the path is `nocompress`.
765 
    pub fn store_blob_for(&self, content: &[u8], nocompress: bool) -> Result<ObjectRef> {
766 
        if !nocompress {
767 
            return self.store_blob(content);
768 
        }
769 
        for c in crate::chunk::chunks(content) {
770 
            self.store.put_chunk_nocompress(c)?;
771 
        }
75167672 Andy McCall 772 
        Ok(self
773 
            .store
774 
            .put(ObjectType::Blob, &Self::blob_for(content).encode())?)
cdb5beba Andy McCall ↶ 775 
    }
776
777 
    fn locks_dir(&self) -> PathBuf {
778 
        self.oxy.join("locks")
779 
    }
780
781 
    /// Whether `path` is locked locally for editing (spec §18, advisory).
782 
    pub fn is_locked(&self, path: &str) -> bool {
783 
        self.locks_dir().join(path.replace('/', "%2F")).exists()
784 
    }
785
786 
    /// Take the advisory local lock on a `lockable` file and make it writable.
787 
    pub fn lock_path(&self, path: &str) -> Result<()> {
788 
        let attrs = self.disk_attributes();
789 
        if !attrs.lookup(path).lockable {
790 
            return fail(format!("{path} is not marked lockable in .oxyattributes"));
791 
        }
792 
        fs::create_dir_all(self.locks_dir())?;
75167672 Andy McCall 793 
        write_atomic(
794 
            &self.locks_dir().join(path.replace('/', "%2F")),
795 
            std::process::id().to_string().as_bytes(),
796 
        )?;
cdb5beba Andy McCall ↶ 797 
        set_readonly(&self.root.join(path), false)?;
798 
        Ok(())
799 
    }
800
801 
    /// Release the local lock and make the file read-only again.
802 
    pub fn unlock_path(&self, path: &str) -> Result<()> {
803 
        let _ = fs::remove_file(self.locks_dir().join(path.replace('/', "%2F")));
804 
        if self.root.join(path).exists() {
805 
            set_readonly(&self.root.join(path), true)?;
806 
        }
807 
        Ok(())
808 
    }
809
7421309f Andy McCall ↶ 810 
    /// Whether a repository path is inside the sparse filter (spec §17).
811 
    pub fn in_scope(&self, path: &str) -> bool {
75167672 Andy McCall 812 
        self.config.sparse_paths.is_empty()
813 
            || self
814 
                .config
815 
                .sparse_paths
816 
                .iter()
817 
                .any(|p| path == p || path.starts_with(&format!("{p}/")))
7421309f Andy McCall ↶ 818 
    }
819
98286406 Andy McCall ↶ 820 
    fn walk_working_copy(&self) -> Result<BTreeMap<String, FsEntry>> {
4dee277c Andy McCall ↶ 821 
        self.walk_working_copy_with(None, &BTreeMap::new())
822 
    }
823
824 
    /// A walker over the working copy that never enters a nested repository
825 
    /// (a directory below the root holding `.oxy` or `.git`); the directories
826 
    /// it skipped are collected into `nested`.
75167672 Andy McCall 827 
    pub(crate) fn walker(
828 
        &self,
829 
        nested: &std::sync::Arc<std::sync::Mutex<Vec<PathBuf>>>,
830 
    ) -> ignore::WalkBuilder {
4dee277c Andy McCall ↶ 831 
        let mut wb = ignore::WalkBuilder::new(&self.root);
832 
        wb.hidden(false)
833 
            .git_ignore(false)
834 
            .git_global(false)
835 
            .git_exclude(false)
836 
            .require_git(false)
837 
            .follow_links(false)
838 
            .add_custom_ignore_filename(".oxyignore");
839 
        let nested = nested.clone();
840 
        wb.filter_entry(move |e| {
841 
            if e.file_name() == OXY_DIR {
842 
                return false;
843 
            }
75167672 Andy McCall 844 
            if e.depth() > 0
845 
                && e.file_type().is_some_and(|t| t.is_dir())
846 
                && (e.path().join(OXY_DIR).exists() || e.path().join(".git").exists())
847 
            {
4dee277c Andy McCall ↶ 848 
                nested.lock().unwrap().push(e.path().to_path_buf());
849 
                return false;
850 
            }
851 
            true
852 
        });
853 
        wb
b7f102fc Andy McCall ↶ 854 
    }
855
856 
    /// Walk the working copy; with a manifest, a file whose size and mtime
857 
    /// match it is not read: an opaque file yields its known blob, a text
858 
    /// file is read but keeps its known hash. Files modified within two
859 
    /// seconds of the manifest are never trusted (a racy stat).
9ac1fbe2 Andy McCall ↶ 860 
    ///
861 
    /// `.oxyignore` applies to untracked paths only: every path in `tracked`
862 
    /// (the base state's files) that exists on disk is included even when
863 
    /// an ignore rule matches it, as in Git.
75167672 Andy McCall 864 
    fn walk_working_copy_with(
865 
        &self,
866 
        cache: Option<&prompt::Manifest>,
867 
        tracked: &BTreeMap<String, (NodeKind, Option<ObjectRef>)>,
868 
    ) -> Result<BTreeMap<String, FsEntry>> {
4dee277c Andy McCall ↶ 869 
        let nested = std::sync::Arc::new(std::sync::Mutex::new(Vec::new()));
870 
        let wb = self.walker(&nested);
98286406 Andy McCall ↶ 871 
        let mut out = BTreeMap::new();
872 
        for entry in wb.build() {
873 
            let entry = entry.map_err(|e| RepoError::Msg(e.to_string()))?;
874 
            let path = entry.path();
875 
            if path == self.root {
876 
                continue;
877 
            }
878 
            let rel = path.strip_prefix(&self.root).unwrap();
75167672 Andy McCall 879 
            let rel: String = rel
880 
                .components()
881 
                .map(|c| c.as_os_str().to_string_lossy().to_string())
882 
                .collect::<Vec<_>>()
883 
                .join("/");
884 
            let Some(ft) = entry.file_type() else {
885 
                continue;
886 
            };
7421309f Andy McCall ↶ 887 
            if ft.is_dir() || !self.in_scope(&rel) {
98286406 Andy McCall ↶ 888 
                continue;
889 
            }
890 
            if ft.is_symlink() {
891 
                let target = fs::read_link(path)?;
75167672 Andy McCall 892 
                out.insert(
893 
                    rel,
894 
                    FsEntry::new(
895 
                        NodeKind::Symlink,
896 
                        false,
897 
                        target.to_string_lossy().as_bytes().to_vec(),
898 
                    ),
899 
                );
98286406 Andy McCall ↶ 900 
            } else if ft.is_file() {
75167672 Andy McCall 901 
                let meta = entry
902 
                    .metadata()
903 
                    .map_err(|e| RepoError::Msg(e.to_string()))?;
9ac1fbe2 Andy McCall ↶ 904 
                let e = self.file_entry(&rel, path, &meta, cache)?;
905 
                out.insert(rel, e);
98286406 Andy McCall ↶ 906 
            }
907 
        }
4dee277c Andy McCall ↶ 908 
        // Nested repositories (spec §7.8): registered in `.oxymodules` or
909 
        // already tracked as subrepo nodes, they contribute their pin;
910 
        // unregistered ones are left alone.
911 
        let modules = self.modules_on_disk();
912 
        let removed = self.removed_subrepos();
913 
        for rel in &removed {
914 
            if tracked.get(rel).map(|(k, _)| *k) != Some(NodeKind::Subrepo) {
915 
                self.clear_removed_subrepo(rel);
916 
            }
917 
        }
918 
        let nested_dirs = std::mem::take(&mut *nested.lock().unwrap());
919 
        for dir in nested_dirs {
920 
            let rel = self.rel_path(&dir);
921 
            if !self.in_scope(&rel) || removed.contains(&rel) {
922 
                continue;
923 
            }
924 
            let registered = modules.entries.get(&rel);
75167672 Andy McCall 925 
            if registered.is_none() && tracked.get(&rel).map(|(k, _)| *k) != Some(NodeKind::Subrepo)
926 
            {
4dee277c Andy McCall ↶ 927 
                continue;
928 
            }
929 
            let pin = subrepos::read_pin(&dir, registered.and_then(|m| m.bookmark.as_deref()))?;
930 
            out.insert(rel, FsEntry::new(NodeKind::Subrepo, false, pin.encode()));
931 
        }
9ac1fbe2 Andy McCall ↶ 932 
        // Tracked paths the ignore rules hid.
4dee277c Andy McCall ↶ 933 
        for (rel, (kind, blob)) in tracked {
9ac1fbe2 Andy McCall ↶ 934 
            if out.contains_key(rel) || !self.in_scope(rel) {
935 
                continue;
936 
            }
937 
            let path = self.root.join(rel);
4dee277c Andy McCall ↶ 938 
            if *kind == NodeKind::Subrepo {
939 
                if removed.contains(rel) {
940 
                    continue;
941 
                }
75167672 Andy McCall 942 
                let present =
943 
                    path.is_dir() && (path.join(OXY_DIR).exists() || path.join(".git").exists());
4dee277c Andy McCall ↶ 944 
                if present {
75167672 Andy McCall 945 
                    let pin = subrepos::read_pin(
946 
                        &path,
947 
                        modules.entries.get(rel).and_then(|m| m.bookmark.as_deref()),
948 
                    )?;
949 
                    out.insert(
950 
                        rel.clone(),
951 
                        FsEntry::new(NodeKind::Subrepo, false, pin.encode()),
952 
                    );
4dee277c Andy McCall ↶ 953 
                } else if let Some(b) = blob {
954 
                    // Not cloned (or emptied): the pin stays as recorded, as a
955 
                    // Git gitlink does when its directory is absent.
75167672 Andy McCall 956 
                    out.insert(
957 
                        rel.clone(),
958 
                        FsEntry {
959 
                            kind: NodeKind::Subrepo,
960 
                            exec: false,
961 
                            content: vec![],
962 
                            blob: Some(*b),
963 
                            content_hash: None,
964 
                        },
965 
                    );
4dee277c Andy McCall ↶ 966 
                }
967 
                continue;
968 
            }
75167672 Andy McCall 969 
            let Ok(meta) = fs::symlink_metadata(&path) else {
970 
                continue;
971 
            };
9ac1fbe2 Andy McCall ↶ 972 
            let ft = meta.file_type();
973 
            if ft.is_symlink() {
974 
                let target = fs::read_link(&path)?;
75167672 Andy McCall 975 
                out.insert(
976 
                    rel.clone(),
977 
                    FsEntry::new(
978 
                        NodeKind::Symlink,
979 
                        false,
980 
                        target.to_string_lossy().as_bytes().to_vec(),
981 
                    ),
982 
                );
9ac1fbe2 Andy McCall ↶ 983 
            } else if ft.is_file() {
984 
                let e = self.file_entry(rel, &path, &meta, cache)?;
985 
                out.insert(rel.clone(), e);
986 
            }
987 
        }
98286406 Andy McCall ↶ 988 
        Ok(out)
989 
    }
9ac1fbe2 Andy McCall ↶ 990
991 
    /// The entry for one regular file, read or served from the stat cache.
75167672 Andy McCall 992 
    fn file_entry(
993 
        &self,
994 
        rel: &str,
995 
        path: &Path,
996 
        meta: &fs::Metadata,
997 
        cache: Option<&prompt::Manifest>,
998 
    ) -> Result<FsEntry> {
9ac1fbe2 Andy McCall ↶ 999 
        let exec = is_executable(meta);
1000 
        let cached = cache.and_then(|m| {
1001 
            let e = m.entries.get(rel)?;
1002 
            let mtime_ns = prompt::mtime_ns(meta);
1003 
            let racy = mtime_ns + 2_000_000_000 >= m.written_ns;
1004 
            (e.size == meta.len() && e.mtime_ns == mtime_ns && !racy).then_some(e)
1005 
        });
1006 
        Ok(match cached {
75167672 Andy McCall 1007 
            Some(e) if e.blob.is_some_and(|b| self.store.has(&b)) => FsEntry {
1008 
                kind: NodeKind::File,
1009 
                exec,
1010 
                content: vec![],
1011 
                blob: e.blob,
1012 
                content_hash: Some(e.hash.clone()),
1013 
            },
1014 
            Some(e) => FsEntry {
1015 
                kind: NodeKind::File,
1016 
                exec,
1017 
                content: fs::read(path)?,
1018 
                blob: None,
1019 
                content_hash: Some(e.hash.clone()),
1020 
            },
9ac1fbe2 Andy McCall ↶ 1021 
            None => FsEntry::new(NodeKind::File, exec, fs::read(path)?),
1022 
        })
1023 
    }
1024
4dee277c Andy McCall ↶ 1025 
    /// The non-directory paths of a snapshot with their kinds, for the
1026 
    /// walker's `tracked` set.
75167672 Andy McCall 1027 
    pub(crate) fn tracked_kinds(
1028 
        snapshot: &Snapshot,
1029 
    ) -> BTreeMap<String, (NodeKind, Option<ObjectRef>)> {
4dee277c Andy McCall ↶ 1030 
        snapshot
1031 
            .files
1032 
            .iter()
1033 
            .filter(|(_, f)| f.kind != NodeKind::Dir)
1034 
            .map(|(p, f)| {
1035 
                let blob = match &f.content {
1036 
                    FileContent::Opaque { blobs } => blobs.first().copied(),
1037 
                    _ => None,
1038 
                };
1039 
                (p.clone(), (f.kind, blob))
1040 
            })
1041 
            .collect()
1042 
    }
1043
1044 
    /// A path under the root as a `/`-separated relative string.
1045 
    pub(crate) fn rel_path(&self, path: &Path) -> String {
75167672 Andy McCall 1046 
        path.strip_prefix(&self.root)
1047 
            .unwrap_or(path)
1048 
            .components()
1049 
            .map(|c| c.as_os_str().to_string_lossy().to_string())
1050 
            .collect::<Vec<_>>()
1051 
            .join("/")
9ac1fbe2 Andy McCall ↶ 1052 
    }
98286406 Andy McCall ↶ 1053 
}
1054
1055 
impl Repo {
1056 
    /// Changes reachable from the bookmark and the working copy, newest first.
1057 
    pub fn log(&self) -> Result<Vec<LogEntry>> {
e02bf0cd Andy McCall ↶ 1058 
        let heads = self.bookmark_heads()?;
1059 
        if self.bare {
1060 
            return self.log_state(&heads);
1061 
        }
98286406 Andy McCall ↶ 1062 
        let (wc_hash, _) = self.working_copy()?;
e02bf0cd Andy McCall ↶ 1063 
        let mut all = heads.clone();
1064 
        all.push(wc_hash);
1065 
        let state = self.load_state(&all)?;
1066 
        let head_set: BTreeSet<ChangeHash> = heads.into_iter().collect();
252e8cb2 Andy McCall ↶ 1067 
        let mut entries: Vec<LogEntry> = Vec::new();
2863456a Andy McCall ↶ 1068 
        for (h, meta) in state.changes() {
75167672 Andy McCall 1069 
            entries.push(LogEntry {
1070 
                hash: *h,
1071 
                change: meta.clone(),
1072 
                is_working_copy: *h == wc_hash,
1073 
                is_head: head_set.contains(h),
1074 
            });
252e8cb2 Andy McCall ↶ 1075 
        }
75167672 Andy McCall 1076 
        entries.sort_by(|a, b| {
1077 
            b.is_working_copy
1078 
                .cmp(&a.is_working_copy)
1079 
                .then(b.change.hlc.cmp(&a.change.hlc))
1080 
                .then(b.hash.cmp(&a.hash))
1081 
        });
98286406 Andy McCall ↶ 1082 
        Ok(entries)
1083 
    }
1084
e02bf0cd Andy McCall ↶ 1085 
    /// The log of the state with these heads, newest first, with no working
1086 
    /// copy involved (for hosted repositories and any explicit state).
1087 
    pub fn log_state(&self, heads: &[ChangeHash]) -> Result<Vec<LogEntry>> {
1088 
        let state = self.load_state(heads)?;
1089 
        let head_set: BTreeSet<ChangeHash> = state.heads().into_iter().collect();
1090 
        let mut entries: Vec<LogEntry> = state
1091 
            .changes()
75167672 Andy McCall 1092 
            .map(|(h, meta)| LogEntry {
1093 
                hash: *h,
1094 
                change: meta.clone(),
1095 
                is_working_copy: false,
1096 
                is_head: head_set.contains(h),
1097 
            })
e02bf0cd Andy McCall ↶ 1098 
            .collect();
1099 
        entries.sort_by(|a, b| b.change.hlc.cmp(&a.change.hlc).then(b.hash.cmp(&a.hash)));
1100 
        Ok(entries)
1101 
    }
1102
132b884b Andy McCall ↶ 1103 
    /// Resolve a spec to a set of heads: a tag name, the current bookmark's
1104 
    /// name, or a single change (`resolve_change`).
1105 
    pub fn resolve_heads(&self, spec: &str) -> Result<Vec<ChangeHash>> {
7b9809e6 Andy McCall ↶ 1106 
        let view = self.view()?;
1107 
        if let Some(st) = view.bookmarks.get(spec) {
1108 
            return Ok(self.store.get_state(st)?.heads);
132b884b Andy McCall ↶ 1109 
        }
1110 
        if let Some(heads) = self.tag_heads(spec)? {
1111 
            return Ok(heads);
1112 
        }
1113 
        Ok(vec![self.resolve_change(spec)?])
1114 
    }
1115
98286406 Andy McCall ↶ 1116 
    /// Resolve a change by ChangeId prefix, `#hash` prefix, `@` (working copy), or bookmark.
1117 
    pub fn resolve_change(&self, spec: &str) -> Result<ChangeHash> {
1118 
        if spec == "@" {
1119 
            return Ok(self.working_copy()?.0);
1120 
        }
7b9809e6 Andy McCall ↶ 1121 
        if let Some(st) = self.view()?.bookmarks.get(spec) {
1122 
            let heads = self.store.get_state(st)?.heads;
1123 
            return match heads.len() {
1124 
                1 => Ok(heads[0]),
1125 
                n => fail(format!("bookmark {spec} has {n} heads; name a change, or use it where a state is expected")),
1126 
            };
1127 
        }
98286406 Andy McCall ↶ 1128 
        if spec.is_empty() || spec == "#" {
1129 
            return fail("empty change specifier");
1130 
        }
1131 
        let entries = self.log()?;
1132 
        let matches: Vec<&LogEntry> = if let Some(hp) = spec.strip_prefix('#') {
75167672 Andy McCall 1133 
            entries
1134 
                .iter()
1135 
                .filter(|e| e.hash.starts_with_hex(hp))
1136 
                .collect()
98286406 Andy McCall ↶ 1137 
        } else {
75167672 Andy McCall 1138 
            entries
1139 
                .iter()
1140 
                .filter(|e| e.change.change_id.starts_with_hex(spec))
1141 
                .collect()
98286406 Andy McCall ↶ 1142 
        };
1143 
        match matches.len() {
1144 
            1 => Ok(matches[0].hash),
1145 
            0 => fail(format!("no change matches {spec:?}")),
1146 
            _ => {
1147 
                let ids: BTreeSet<ChangeId> = matches.iter().map(|e| e.change.change_id).collect();
1148 
                if ids.len() == 1 {
75167672 Andy McCall 1149 
                    fail(format!(
1150 
                        "change {spec} is divergent: {} variants",
1151 
                        matches.len()
1152 
                    ))
98286406 Andy McCall ↶ 1153 
                } else {
1154 
                    fail(format!("{spec:?} is ambiguous"))
1155 
                }
1156 
            }
1157 
        }
1158 
    }
1159
1160 
    /// Human-readable description of what a change does, with line content.
1161 
    pub fn describe_change(&self, hash: &ChangeHash) -> Result<String> {
1162 
        let change = self.store.get_change(hash)?;
1163 
        let base = self.load_state(&change.deps)?;
1164 
        let base_snapshot = base.materialize();
1165 
        Ok(render_change(&change, &base, &base_snapshot))
1166 
    }
1167 
}
1168
1169 
fn remove_any(path: &Path) -> std::io::Result<()> {
1170 
    let m = fs::symlink_metadata(path)?;
75167672 Andy McCall 1171 
    if m.is_dir() {
1172 
        fs::remove_dir_all(path)
1173 
    } else {
1174 
        fs::remove_file(path)
1175 
    }
98286406 Andy McCall ↶ 1176 
}
1177
cdb5beba Andy McCall ↶ 1178 
fn set_readonly(path: &Path, readonly: bool) -> std::io::Result<()> {
1179 
    let mut perms = fs::metadata(path)?.permissions();
1180 
    perms.set_readonly(readonly);
1181 
    fs::set_permissions(path, perms)
1182 
}
1183
98286406 Andy McCall ↶ 1184 
#[cfg(unix)]
1185 
fn set_executable(path: &Path, exec: bool) -> std::io::Result<()> {
1186 
    use std::os::unix::fs::PermissionsExt;
1187 
    let mut perms = fs::metadata(path)?.permissions();
1188 
    let mode = perms.mode();
1189 
    let want = if exec { mode | 0o111 } else { mode & !0o111 };
1190 
    if want != mode {
1191 
        perms.set_mode(want);
1192 
        fs::set_permissions(path, perms)?;
1193 
    }
1194 
    Ok(())
1195 
}
1196 
#[cfg(not(unix))]
1197 
fn set_executable(_path: &Path, _exec: bool) -> std::io::Result<()> {
1198 
    Ok(())
1199 
}
1200
1201 
#[cfg(unix)]
1202 
fn is_executable(m: &fs::Metadata) -> bool {
1203 
    use std::os::unix::fs::PermissionsExt;
1204 
    m.permissions().mode() & 0o111 != 0
1205 
}
1206 
#[cfg(not(unix))]
1207 
fn is_executable(_m: &fs::Metadata) -> bool {
1208 
    false
1209 
}
1210
1211 
fn op_ref(k: OpKey) -> OpRef {
75167672 Andy McCall 1212 
    OpRef {
1213 
        change: k.0,
1214 
        index: k.1,
1215 
    }
98286406 Andy McCall ↶ 1216 
}
1217
1218 
fn split_path(path: &str) -> (&str, &str) {
1219 
    match path.rfind('/') {
1220 
        Some(i) => (&path[..i], &path[i + 1..]),
1221 
        None => ("", path),
1222 
    }
1223 
}