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annotate rust/hg-core/src/operations/cat.rs @ 46434:3e2d539d0d1a

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rust: remove `FooError` structs with only `kind: FooErrorKind` enum field Use the enum directly as `FooError` instead. Differential Revision: https://phab.mercurial-scm.org/D9874
author Simon Sapin <simon.sapin@octobus.net>
date Tue, 26 Jan 2021 19:07:24 +0100
parents 4b381dbbf8b7
children b274aa2f20fd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // list_tracked_files.rs
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2 //
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3 // Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use std::convert::From;
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9 use std::path::PathBuf;
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10
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11 use crate::repo::Repo;
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12 use crate::revlog::changelog::Changelog;
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13 use crate::revlog::manifest::Manifest;
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14 use crate::revlog::path_encode::path_encode;
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15 use crate::revlog::revlog::Revlog;
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16 use crate::revlog::revlog::RevlogError;
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17 use crate::revlog::Node;
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18 use crate::utils::files::get_path_from_bytes;
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19 use crate::utils::hg_path::{HgPath, HgPathBuf};
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20
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21 const METADATA_DELIMITER: [u8; 2] = [b'\x01', b'\n'];
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22
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23 /// Error type for `cat`
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24 #[derive(Debug)]
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25 pub enum CatRevError {
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26 /// Error when reading a `revlog` file.
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27 IoError(std::io::Error),
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28 /// The revision has not been found.
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29 InvalidRevision,
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30 /// Found more than one revision whose ID match the requested prefix
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31 AmbiguousPrefix,
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32 /// A `revlog` file is corrupted.
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33 CorruptedRevlog,
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34 /// The `revlog` format version is not supported.
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35 UnsuportedRevlogVersion(u16),
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36 /// The `revlog` data format is not supported.
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37 UnknowRevlogDataFormat(u8),
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38 }
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39
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40 impl From<RevlogError> for CatRevError {
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41 fn from(err: RevlogError) -> Self {
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42 match err {
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43 RevlogError::IoError(err) => CatRevError::IoError(err),
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44 RevlogError::UnsuportedVersion(version) => {
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45 CatRevError::UnsuportedRevlogVersion(version)
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46 }
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47 RevlogError::InvalidRevision => CatRevError::InvalidRevision,
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48 RevlogError::AmbiguousPrefix => CatRevError::AmbiguousPrefix,
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49 RevlogError::Corrupted => CatRevError::CorruptedRevlog,
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50 RevlogError::UnknowDataFormat(format) => {
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51 CatRevError::UnknowRevlogDataFormat(format)
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52 }
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53 }
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54 }
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55 }
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56
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57 /// List files under Mercurial control at a given revision.
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58 ///
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59 /// * `root`: Repository root
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60 /// * `rev`: The revision to cat the files from.
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61 /// * `files`: The files to output.
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62 pub fn cat(
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63 repo: &Repo,
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64 revset: &str,
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65 files: &[HgPathBuf],
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66 ) -> Result<Vec<u8>, CatRevError> {
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67 let rev = crate::revset::resolve_single(revset, repo)?;
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68 let changelog = Changelog::open(repo)?;
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69 let manifest = Manifest::open(repo)?;
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70 let changelog_entry = changelog.get_rev(rev)?;
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71 let manifest_node = Node::from_hex(&changelog_entry.manifest_node()?)
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72 .map_err(|_| CatRevError::CorruptedRevlog)?;
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73 let manifest_entry = manifest.get_node(manifest_node.into())?;
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74 let mut bytes = vec![];
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75
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76 for (manifest_file, node_bytes) in manifest_entry.files_with_nodes() {
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77 for cat_file in files.iter() {
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78 if cat_file.as_bytes() == manifest_file.as_bytes() {
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79 let index_path = store_path(manifest_file, b".i");
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80 let data_path = store_path(manifest_file, b".d");
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81
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82 let file_log =
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83 Revlog::open(repo, &index_path, Some(&data_path))?;
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84 let file_node = Node::from_hex(node_bytes)
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85 .map_err(|_| CatRevError::CorruptedRevlog)?;
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86 let file_rev = file_log.get_node_rev(file_node.into())?;
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87 let data = file_log.get_rev_data(file_rev)?;
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88 if data.starts_with(&METADATA_DELIMITER) {
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89 let end_delimiter_position = data
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90 [METADATA_DELIMITER.len()..]
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91 .windows(METADATA_DELIMITER.len())
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92 .position(|bytes| bytes == METADATA_DELIMITER);
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93 if let Some(position) = end_delimiter_position {
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94 let offset = METADATA_DELIMITER.len() * 2;
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95 bytes.extend(data[position + offset..].iter());
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96 }
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97 } else {
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98 bytes.extend(data);
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99 }
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100 }
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101 }
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102 }
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103
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104 Ok(bytes)
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105 }
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106
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107 fn store_path(hg_path: &HgPath, suffix: &[u8]) -> PathBuf {
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108 let encoded_bytes =
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109 path_encode(&[b"data/", hg_path.as_bytes(), suffix].concat());
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110 get_path_from_bytes(&encoded_bytes).into()
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111 }