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annotate rust/rhg/src/error.rs @ 46593:5ce2aa7c2ad5

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rhg: Move `Repo` object creation into `main()` ? rather than in each sub-command that needs a local repository. This will allow accessing e.g. `.hg/blackbox.log` before dispatching to sub-commands. Differential Revision: https://phab.mercurial-scm.org/D10004
author Simon Sapin <simon.sapin@octobus.net>
date Mon, 15 Feb 2021 20:13:09 +0100
parents 21d3b40b4c0e
children 33f2d56acc73
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::ui::utf8_to_local;
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2 use crate::ui::UiError;
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3 use crate::NoRepoInCwdError;
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4 use format_bytes::format_bytes;
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5 use hg::config::{ConfigError, ConfigParseError};
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6 use hg::errors::HgError;
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7 use hg::repo::RepoError;
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8 use hg::revlog::revlog::RevlogError;
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9 use hg::utils::files::get_bytes_from_path;
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10 use std::convert::From;
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11
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12 /// The kind of command error
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13 #[derive(Debug)]
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14 pub enum CommandError {
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15 /// Exit with an error message and "standard" failure exit code.
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16 Abort { message: Vec<u8> },
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17
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18 /// A mercurial capability as not been implemented.
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19 ///
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20 /// There is no error message printed in this case.
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21 /// Instead, we exit with a specic status code and a wrapper script may
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22 /// fallback to Python-based Mercurial.
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23 Unimplemented,
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24 }
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25
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26 impl CommandError {
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27 pub fn abort(message: impl AsRef<str>) -> Self {
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28 CommandError::Abort {
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29 // TODO: bytes-based (instead of Unicode-based) formatting
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30 // of error messages to handle non-UTF-8 filenames etc:
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31 // https://www.mercurial-scm.org/wiki/EncodingStrategy#Mixing_output
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32 message: utf8_to_local(message.as_ref()).into(),
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33 }
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34 }
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35 }
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36
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37 /// For now we don’t differenciate between invalid CLI args and valid for `hg`
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38 /// but not supported yet by `rhg`.
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39 impl From<clap::Error> for CommandError {
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40 fn from(_: clap::Error) -> Self {
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41 CommandError::Unimplemented
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42 }
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43 }
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44
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45 impl From<HgError> for CommandError {
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46 fn from(error: HgError) -> Self {
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47 match error {
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48 HgError::UnsupportedFeature(_) => CommandError::Unimplemented,
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49 _ => CommandError::abort(error.to_string()),
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50 }
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51 }
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52 }
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53
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54 impl From<UiError> for CommandError {
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55 fn from(_error: UiError) -> Self {
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56 // If we already failed writing to stdout or stderr,
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57 // writing an error message to stderr about it would be likely to fail
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58 // too.
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59 CommandError::abort("")
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60 }
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61 }
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62
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63 impl From<RepoError> for CommandError {
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64 fn from(error: RepoError) -> Self {
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65 match error {
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66 RepoError::NotFound { at } => CommandError::Abort {
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67 message: format_bytes!(
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68 b"repository {} not found",
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69 get_bytes_from_path(at)
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70 ),
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71 },
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72 RepoError::ConfigParseError(error) => error.into(),
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73 RepoError::Other(error) => error.into(),
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74 }
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75 }
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76 }
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77
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78 impl<'a> From<&'a NoRepoInCwdError> for CommandError {
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79 fn from(error: &'a NoRepoInCwdError) -> Self {
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80 let NoRepoInCwdError { cwd } = error;
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81 CommandError::Abort {
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82 message: format_bytes!(
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83 b"no repository found in '{}' (.hg not found)!",
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84 get_bytes_from_path(cwd)
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85 ),
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86 }
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87 }
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88 }
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89
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90 impl From<ConfigError> for CommandError {
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91 fn from(error: ConfigError) -> Self {
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92 match error {
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93 ConfigError::Parse(error) => error.into(),
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94 ConfigError::Other(error) => error.into(),
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95 }
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96 }
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97 }
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98
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99 impl From<ConfigParseError> for CommandError {
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100 fn from(error: ConfigParseError) -> Self {
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101 let ConfigParseError {
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102 origin,
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103 line,
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104 bytes,
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105 } = error;
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106 let line_message = if let Some(line_number) = line {
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107 format_bytes!(b" at line {}", line_number.to_string().into_bytes())
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108 } else {
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109 Vec::new()
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110 };
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111 CommandError::Abort {
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112 message: format_bytes!(
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113 b"config parse error in {}{}: '{}'",
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114 origin,
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115 line_message,
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116 bytes
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117 ),
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118 }
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119 }
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120 }
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121
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122 impl From<(RevlogError, &str)> for CommandError {
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123 fn from((err, rev): (RevlogError, &str)) -> CommandError {
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124 match err {
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125 RevlogError::InvalidRevision => CommandError::abort(format!(
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126 "invalid revision identifier {}",
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127 rev
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128 )),
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129 RevlogError::AmbiguousPrefix => CommandError::abort(format!(
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130 "ambiguous revision identifier {}",
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131 rev
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132 )),
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133 RevlogError::Other(error) => error.into(),
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134 }
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135 }
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136 }