author | Simon Sapin <simon.sapin@octobus.net> |
Thu, 14 Jan 2021 13:04:12 +0100 | |
changeset 46462 | d03b0601e0eb |
parent 46446 | 1dcd9c9975ed |
child 46463 | 95b276283b67 |
permissions | -rw-r--r-- |
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use crate::errors::{HgError, IoResultExt}; |
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use crate::requirements; |
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use crate::utils::files::get_path_from_bytes; |
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use memmap::{Mmap, MmapOptions}; |
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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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} |
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#[derive(Debug, derive_more::From)] |
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pub enum RepoFindError { |
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NotFoundInCurrentDirectoryOrAncestors { |
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current_directory: PathBuf, |
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}, |
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#[from] |
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Other(HgError), |
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} |
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/// Filesystem access abstraction for the contents of a given "base" diretory |
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#[derive(Clone, Copy)] |
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pub(crate) struct Vfs<'a> { |
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base: &'a Path, |
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} |
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impl Repo { |
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/// Search the current directory and its ancestores for a repository: |
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/// a working directory that contains a `.hg` sub-directory. |
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pub fn find() -> Result<Self, RepoFindError> { |
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let current_directory = crate::utils::current_dir()?; |
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// ancestors() is inclusive: it first yields `current_directory` as-is. |
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for ancestor in current_directory.ancestors() { |
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if ancestor.join(".hg").is_dir() { |
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return Ok(Self::new_at_path(ancestor.to_owned())?); |
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} |
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} |
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Err(RepoFindError::NotFoundInCurrentDirectoryOrAncestors { |
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current_directory, |
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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(working_directory: PathBuf) -> Result<Self, HgError> { |
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let dot_hg = working_directory.join(".hg"); |
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let hg_vfs = Vfs { base: &dot_hg }; |
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let 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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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 = get_path_from_bytes(&bytes).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 !shared_path.is_dir() { |
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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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} |
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store_path = shared_path.join("store"); |
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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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}; |
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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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|
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pub fn requirements(&self) -> &HashSet<String> { |
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&self.requirements |
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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(crate) 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(crate) 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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// The undescore prefix silences the "never used" warning. Remove before |
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109 |
// using. |
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pub(crate) fn _working_directory_vfs(&self) -> Vfs<'_> { |
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111 |
Vfs { |
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112 |
base: &self.working_directory, |
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113 |
} |
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114 |
} |
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115 |
} |
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116 |
|
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117 |
impl Vfs<'_> { |
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pub(crate) fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf { |
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119 |
self.base.join(relative_path) |
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120 |
} |
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121 |
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122 |
pub(crate) fn read( |
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123 |
&self, |
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124 |
relative_path: impl AsRef<Path>, |
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125 |
) -> Result<Vec<u8>, HgError> { |
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126 |
let path = self.join(relative_path); |
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127 |
std::fs::read(&path).for_file(&path) |
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128 |
} |
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129 |
|
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130 |
pub(crate) fn mmap_open( |
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131 |
&self, |
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132 |
relative_path: impl AsRef<Path>, |
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133 |
) -> Result<Mmap, HgError> { |
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let path = self.base.join(relative_path); |
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135 |
let file = std::fs::File::open(&path).for_file(&path)?; |
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136 |
// TODO: what are the safety requirements here? |
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137 |
let mmap = unsafe { MmapOptions::new().map(&file) }.for_file(&path)?; |
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138 |
Ok(mmap) |
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139 |
} |
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140 |
} |