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annotate rust/hg-core/src/operations/debugdata.rs @ 45862:5c736ba5dc27

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rust-status: don't bubble up os errors, translate them to bad matches In the rare cases when either the OS/filesystem throws an error on an otherwise valid action, or because a path is not representable on the filesystem, or because of concurrent actions in the filesystem, we want to warn the user about said path instead of bubbling up the error, causing an exception to be raised in the Python layer. Differential Revision: https://phab.mercurial-scm.org/D9320
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 16 Nov 2020 16:38:57 +0100
parents 57dc78861196
children 8d6164098782
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1 // debugdata.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 super::find_root;
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9 use crate::revlog::revlog::{Revlog, RevlogError};
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10 use crate::revlog::Revision;
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11
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12 /// Kind of data to debug
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13 #[derive(Debug, Copy, Clone)]
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14 pub enum DebugDataKind {
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15 Changelog,
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16 Manifest,
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17 }
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18
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19 /// Kind of error encountered by DebugData
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20 #[derive(Debug)]
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21 pub enum DebugDataErrorKind {
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22 FindRootError(find_root::FindRootError),
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23 /// Error when reading a `revlog` file.
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24 IoError(std::io::Error),
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25 /// The revision has not been found.
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26 InvalidRevision,
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27 /// A `revlog` file is corrupted.
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28 CorruptedRevlog,
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29 /// The `revlog` format version is not supported.
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30 UnsuportedRevlogVersion(u16),
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31 /// The `revlog` data format is not supported.
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32 UnknowRevlogDataFormat(u8),
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33 }
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34
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35 /// A DebugData error
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36 #[derive(Debug)]
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37 pub struct DebugDataError {
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38 /// Kind of error encountered by DebugData
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39 pub kind: DebugDataErrorKind,
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40 }
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41
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42 impl From<DebugDataErrorKind> for DebugDataError {
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43 fn from(kind: DebugDataErrorKind) -> Self {
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44 DebugDataError { kind }
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45 }
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46 }
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47
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48 impl From<find_root::FindRootError> for DebugDataError {
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49 fn from(err: find_root::FindRootError) -> Self {
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50 let kind = DebugDataErrorKind::FindRootError(err);
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51 DebugDataError { kind }
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52 }
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53 }
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54
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55 impl From<std::io::Error> for DebugDataError {
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56 fn from(err: std::io::Error) -> Self {
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57 let kind = DebugDataErrorKind::IoError(err);
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58 DebugDataError { kind }
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59 }
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60 }
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61
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62 impl From<RevlogError> for DebugDataError {
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63 fn from(err: RevlogError) -> Self {
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64 match err {
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65 RevlogError::IoError(err) => DebugDataErrorKind::IoError(err),
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66 RevlogError::UnsuportedVersion(version) => {
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67 DebugDataErrorKind::UnsuportedRevlogVersion(version)
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68 }
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69 RevlogError::InvalidRevision => {
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70 DebugDataErrorKind::InvalidRevision
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71 }
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72 RevlogError::Corrupted => DebugDataErrorKind::CorruptedRevlog,
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73 RevlogError::UnknowDataFormat(format) => {
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74 DebugDataErrorKind::UnknowRevlogDataFormat(format)
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75 }
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76 }
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77 .into()
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78 }
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79 }
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80
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81 /// Dump the contents data of a revision.
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82 pub struct DebugData<'a> {
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83 /// Revision or hash of the revision.
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84 rev: &'a str,
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85 /// Kind of data to debug.
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86 kind: DebugDataKind,
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87 }
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88
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89 impl<'a> DebugData<'a> {
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90 pub fn new(rev: &'a str, kind: DebugDataKind) -> Self {
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91 DebugData { rev, kind }
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92 }
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93
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94 pub fn run(&mut self) -> Result<Vec<u8>, DebugDataError> {
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95 let root = find_root::FindRoot::new().run()?;
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96 let index_file = match self.kind {
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97 DebugDataKind::Changelog => root.join(".hg/store/00changelog.i"),
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98 DebugDataKind::Manifest => root.join(".hg/store/00manifest.i"),
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99 };
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100 let revlog = Revlog::open(&index_file, None)?;
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101
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102 let data = match self.rev.parse::<Revision>() {
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103 Ok(rev) => revlog.get_rev_data(rev)?,
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104 _ => {
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105 let node = hex::decode(&self.rev)
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106 .map_err(|_| DebugDataErrorKind::InvalidRevision)?;
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107 let rev = revlog.get_node_rev(&node)?;
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108 revlog.get_rev_data(rev)?
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109 }
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110 };
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111
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112 Ok(data)
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113 }
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114 }