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use crate::config::{Config, ConfigError, ConfigParseError};
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use crate::dirstate::DirstateParents;
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use crate::dirstate_tree::dirstate_map::DirstateMap;
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use crate::dirstate_tree::owning::OwningDirstateMap;
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use crate::errors::HgError;
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use crate::errors::HgResultExt;
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use crate::exit_codes;
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use crate::requirements;
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use crate::utils::files::get_path_from_bytes;
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use crate::utils::SliceExt;
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use crate::vfs::{is_dir, is_file, Vfs};
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use crate::DirstateError;
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use std::cell::{Cell, Ref, RefCell, RefMut};
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use std::collections::HashSet;
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use std::path::{Path, PathBuf};
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/// A repository on disk
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pub struct Repo {
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working_directory: PathBuf,
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dot_hg: PathBuf,
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store: PathBuf,
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requirements: HashSet<String>,
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config: Config,
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// None means not known/initialized yet
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dirstate_parents: Cell<Option<DirstateParents>>,
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dirstate_map: RefCell<Option<OwningDirstateMap>>,
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}
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#[derive(Debug, derive_more::From)]
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pub enum RepoError {
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NotFound {
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at: PathBuf,
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},
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#[from]
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ConfigParseError(ConfigParseError),
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#[from]
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Other(HgError),
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}
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impl From<ConfigError> for RepoError {
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fn from(error: ConfigError) -> Self {
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match error {
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ConfigError::Parse(error) => error.into(),
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ConfigError::Other(error) => error.into(),
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}
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}
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}
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impl Repo {
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/// tries to find nearest repository root in current working directory or
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/// its ancestors
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pub fn find_repo_root() -> Result<PathBuf, RepoError> {
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let current_directory = crate::utils::current_dir()?;
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// ancestors() is inclusive: it first yields `current_directory`
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// as-is.
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for ancestor in current_directory.ancestors() {
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if is_dir(ancestor.join(".hg"))? {
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return Ok(ancestor.to_path_buf());
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}
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}
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return Err(RepoError::NotFound {
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at: current_directory,
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});
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}
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/// Find a repository, either at the given path (which must contain a `.hg`
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/// sub-directory) or by searching the current directory and its
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/// ancestors.
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///
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/// A method with two very different "modes" like this usually a code smell
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/// to make two methods instead, but in this case an `Option` is what rhg
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/// sub-commands get from Clap for the `-R` / `--repository` CLI argument.
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/// Having two methods would just move that `if` to almost all callers.
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pub fn find(
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config: &Config,
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explicit_path: Option<PathBuf>,
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) -> Result<Self, RepoError> {
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if let Some(root) = explicit_path {
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if is_dir(root.join(".hg"))? {
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Self::new_at_path(root.to_owned(), config)
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} else if is_file(&root)? {
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Err(HgError::unsupported("bundle repository").into())
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} else {
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Err(RepoError::NotFound {
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at: root.to_owned(),
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})
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}
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} else {
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let root = Self::find_repo_root()?;
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Self::new_at_path(root, config)
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}
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}
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/// To be called after checking that `.hg` is a sub-directory
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fn new_at_path(
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working_directory: PathBuf,
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config: &Config,
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) -> Result<Self, RepoError> {
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let dot_hg = working_directory.join(".hg");
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let mut repo_config_files = Vec::new();
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repo_config_files.push(dot_hg.join("hgrc"));
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repo_config_files.push(dot_hg.join("hgrc-not-shared"));
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let hg_vfs = Vfs { base: &dot_hg };
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let mut reqs = requirements::load_if_exists(hg_vfs)?;
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let relative =
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reqs.contains(requirements::RELATIVE_SHARED_REQUIREMENT);
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let shared =
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reqs.contains(requirements::SHARED_REQUIREMENT) || relative;
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// From `mercurial/localrepo.py`:
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//
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// if .hg/requires contains the sharesafe requirement, it means
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// there exists a `.hg/store/requires` too and we should read it
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// NOTE: presence of SHARESAFE_REQUIREMENT imply that store requirement
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// is present. We never write SHARESAFE_REQUIREMENT for a repo if store
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// is not present, refer checkrequirementscompat() for that
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//
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// However, if SHARESAFE_REQUIREMENT is not present, it means that the
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// repository was shared the old way. We check the share source
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// .hg/requires for SHARESAFE_REQUIREMENT to detect whether the
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// current repository needs to be reshared
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let share_safe = reqs.contains(requirements::SHARESAFE_REQUIREMENT);
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let store_path;
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if !shared {
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store_path = dot_hg.join("store");
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} else {
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let bytes = hg_vfs.read("sharedpath")?;
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let mut shared_path =
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get_path_from_bytes(bytes.trim_end_matches(|b| b == b'\n'))
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.to_owned();
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if relative {
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shared_path = dot_hg.join(shared_path)
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}
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if !is_dir(&shared_path)? {
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return Err(HgError::corrupted(format!(
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".hg/sharedpath points to nonexistent directory {}",
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shared_path.display()
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))
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.into());
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}
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store_path = shared_path.join("store");
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let source_is_share_safe =
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requirements::load(Vfs { base: &shared_path })?
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.contains(requirements::SHARESAFE_REQUIREMENT);
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if share_safe && !source_is_share_safe {
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return Err(match config
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.get(b"share", b"safe-mismatch.source-not-safe")
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{
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Some(b"abort") | None => HgError::abort(
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"abort: share source does not support share-safe requirement\n\
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(see `hg help config.format.use-share-safe` for more information)",
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exit_codes::ABORT,
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),
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_ => HgError::unsupported("share-safe downgrade"),
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}
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.into());
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} else if source_is_share_safe && !share_safe {
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return Err(
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match config.get(b"share", b"safe-mismatch.source-safe") {
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Some(b"abort") | None => HgError::abort(
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"abort: version mismatch: source uses share-safe \
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functionality while the current share does not\n\
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(see `hg help config.format.use-share-safe` for more information)",
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exit_codes::ABORT,
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),
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_ => HgError::unsupported("share-safe upgrade"),
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}
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.into(),
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);
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}
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if share_safe {
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repo_config_files.insert(0, shared_path.join("hgrc"))
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}
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}
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if share_safe {
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reqs.extend(requirements::load(Vfs { base: &store_path })?);
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}
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let repo_config = if std::env::var_os("HGRCSKIPREPO").is_none() {
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config.combine_with_repo(&repo_config_files)?
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} else {
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config.clone()
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};
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let repo = Self {
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requirements: reqs,
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working_directory,
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store: store_path,
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dot_hg,
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config: repo_config,
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dirstate_parents: Cell::new(None),
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dirstate_map: RefCell::new(None),
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};
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requirements::check(&repo)?;
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Ok(repo)
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}
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pub fn working_directory_path(&self) -> &Path {
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&self.working_directory
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}
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pub fn requirements(&self) -> &HashSet<String> {
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&self.requirements
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}
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pub fn config(&self) -> &Config {
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&self.config
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}
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/// For accessing repository files (in `.hg`), except for the store
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/// (`.hg/store`).
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pub fn hg_vfs(&self) -> Vfs<'_> {
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Vfs { base: &self.dot_hg }
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}
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/// For accessing repository store files (in `.hg/store`)
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pub fn store_vfs(&self) -> Vfs<'_> {
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Vfs { base: &self.store }
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}
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/// For accessing the working copy
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pub fn working_directory_vfs(&self) -> Vfs<'_> {
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Vfs {
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base: &self.working_directory,
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}
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}
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pub fn has_dirstate_v2(&self) -> bool {
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self.requirements
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.contains(requirements::DIRSTATE_V2_REQUIREMENT)
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}
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fn dirstate_file_contents(&self) -> Result<Vec<u8>, HgError> {
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Ok(self
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.hg_vfs()
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.read("dirstate")
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.io_not_found_as_none()?
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.unwrap_or(Vec::new()))
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}
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pub fn dirstate_parents(&self) -> Result<DirstateParents, HgError> {
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if let Some(parents) = self.dirstate_parents.get() {
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return Ok(parents);
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}
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let dirstate = self.dirstate_file_contents()?;
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let parents = if dirstate.is_empty() {
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DirstateParents::NULL
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} else if self.has_dirstate_v2() {
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crate::dirstate_tree::on_disk::read_docket(&dirstate)?.parents()
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} else {
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crate::dirstate::parsers::parse_dirstate_parents(&dirstate)?
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.clone()
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};
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self.dirstate_parents.set(Some(parents));
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Ok(parents)
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}
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fn new_dirstate_map(&self) -> Result<OwningDirstateMap, DirstateError> {
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let dirstate_file_contents = self.dirstate_file_contents()?;
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if dirstate_file_contents.is_empty() {
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self.dirstate_parents.set(Some(DirstateParents::NULL));
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Ok(OwningDirstateMap::new_empty(Vec::new()))
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} else if self.has_dirstate_v2() {
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let docket = crate::dirstate_tree::on_disk::read_docket(
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&dirstate_file_contents,
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)?;
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self.dirstate_parents.set(Some(docket.parents()));
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let data_size = docket.data_size();
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let metadata = docket.tree_metadata();
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let mut map = if let Some(data_mmap) = self
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.hg_vfs()
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.mmap_open(docket.data_filename())
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.io_not_found_as_none()?
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{
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OwningDirstateMap::new_empty(MmapWrapper(data_mmap))
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} else {
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OwningDirstateMap::new_empty(Vec::new())
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};
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let (on_disk, placeholder) = map.get_mut_pair();
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*placeholder = DirstateMap::new_v2(on_disk, data_size, metadata)?;
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Ok(map)
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} else {
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let mut map = OwningDirstateMap::new_empty(dirstate_file_contents);
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let (on_disk, placeholder) = map.get_mut_pair();
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let (inner, parents) = DirstateMap::new_v1(on_disk)?;
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self.dirstate_parents
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.set(Some(parents.unwrap_or(DirstateParents::NULL)));
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*placeholder = inner;
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Ok(map)
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}
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}
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pub fn dirstate_map(
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&self,
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) -> Result<Ref<OwningDirstateMap>, DirstateError> {
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let mut borrowed = self.dirstate_map.borrow();
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if borrowed.is_none() {
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drop(borrowed);
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// Only use `borrow_mut` if it is really needed to avoid panic in
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// case there is another outstanding borrow but mutation is not
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// needed.
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*self.dirstate_map.borrow_mut() = Some(self.new_dirstate_map()?);
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borrowed = self.dirstate_map.borrow()
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}
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Ok(Ref::map(borrowed, |option| option.as_ref().unwrap()))
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}
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pub fn dirstate_map_mut(
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&self,
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) -> Result<RefMut<OwningDirstateMap>, DirstateError> {
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let mut borrowed = self.dirstate_map.borrow_mut();
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if borrowed.is_none() {
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*borrowed = Some(self.new_dirstate_map()?);
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}
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Ok(RefMut::map(borrowed, |option| option.as_mut().unwrap()))
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}
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}
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|
|
// TODO: remove this when https://github.com/RazrFalcon/memmap2-rs/pull/22 is on crates.io
|
|
|
struct MmapWrapper(memmap2::Mmap);
|
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|
|
impl std::ops::Deref for MmapWrapper {
|
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type Target = [u8];
|
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fn deref(&self) -> &[u8] {
|
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|
self.0.deref()
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}
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}
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|
|
unsafe impl stable_deref_trait::StableDeref for MmapWrapper {}
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|