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annotate rust/rhg/src/commands/cat.rs @ 48471:b005d07ded7d

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rhg: Skip reading the contents of ambiguous files in some cases If the size of the file in the working directory does not match the length of the filelog data, we know its contents will be different and don?t need to read it. rhg still decodes the filelog revision, which is not needed in some cases. Differential Revision: https://phab.mercurial-scm.org/D11910
author Simon Sapin <simon.sapin@octobus.net>
date Tue, 14 Dec 2021 20:36:36 +0100
parents 698b70b9e8ea
children 044e42ae45d9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::error::CommandError;
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2 use clap::Arg;
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3 use format_bytes::format_bytes;
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4 use hg::operations::cat;
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5 use hg::utils::hg_path::HgPathBuf;
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6 use micro_timer::timed;
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7 use std::convert::TryFrom;
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8
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9 pub const HELP_TEXT: &str = "
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10 Output the current or given revision of files
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11 ";
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12
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13 pub fn args() -> clap::App<'static, 'static> {
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14 clap::SubCommand::with_name("cat")
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15 .arg(
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16 Arg::with_name("rev")
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17 .help("search the repository as it is in REV")
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18 .short("-r")
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19 .long("--rev")
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20 .value_name("REV")
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21 .takes_value(true),
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22 )
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23 .arg(
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24 clap::Arg::with_name("files")
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25 .required(true)
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26 .multiple(true)
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27 .empty_values(false)
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28 .value_name("FILE")
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29 .help("Files to output"),
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30 )
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31 .about(HELP_TEXT)
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32 }
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33
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34 #[timed]
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35 pub fn run(invocation: &crate::CliInvocation) -> Result<(), CommandError> {
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36 let cat_enabled_default = true;
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37 let cat_enabled = invocation.config.get_option(b"rhg", b"cat")?;
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38 if !cat_enabled.unwrap_or(cat_enabled_default) {
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39 return Err(CommandError::unsupported(
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40 "cat is disabled in rhg (enable it with 'rhg.cat = true' \
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41 or enable fallback with 'rhg.on-unsupported = fallback')",
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42 ));
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43 }
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44
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45 let rev = invocation.subcommand_args.value_of("rev");
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46 let file_args = match invocation.subcommand_args.values_of("files") {
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47 Some(files) => files.collect(),
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48 None => vec![],
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49 };
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50
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51 let repo = invocation.repo?;
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52 let cwd = hg::utils::current_dir()?;
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53 let working_directory = repo.working_directory_path();
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54 let working_directory = cwd.join(working_directory); // Make it absolute
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55
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56 let mut files = vec![];
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57 for file in file_args.iter() {
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58 if file.starts_with("set:") {
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59 let message = "fileset";
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60 return Err(CommandError::unsupported(message));
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61 }
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62
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63 let normalized = cwd.join(&file);
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64 // TODO: actually normalize `..` path segments etc?
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65 let dotted = normalized.components().any(|c| c.as_os_str() == "..");
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66 if file == &"." || dotted {
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67 let message = "`..` or `.` path segment";
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68 return Err(CommandError::unsupported(message));
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69 }
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70 let stripped = normalized
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71 .strip_prefix(&working_directory)
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72 // TODO: error message for path arguments outside of the repo
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73 .map_err(|_| CommandError::abort(""))?;
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74 let hg_file = HgPathBuf::try_from(stripped.to_path_buf())
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75 .map_err(|e| CommandError::abort(e.to_string()))?;
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76 files.push(hg_file);
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77 }
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78 let files = files.iter().map(|file| file.as_ref()).collect();
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79 // TODO probably move this to a util function like `repo.default_rev` or
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80 // something when it's used somewhere else
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81 let rev = match rev {
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82 Some(r) => r.to_string(),
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83 None => format!("{:x}", repo.dirstate_parents()?.p1),
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84 };
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85
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86 let output = cat(&repo, &rev, files).map_err(|e| (e, rev.as_str()))?;
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87 for (_file, contents) in output.results {
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88 invocation.ui.write_stdout(&contents)?;
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89 }
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90 if !output.missing.is_empty() {
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91 let short = format!("{:x}", output.node.short()).into_bytes();
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92 for path in &output.missing {
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93 invocation.ui.write_stderr(&format_bytes!(
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94 b"{}: no such file in rev {}\n",
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95 path.as_bytes(),
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96 short
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97 ))?;
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98 }
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99 }
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100 if output.found_any {
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101 Ok(())
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102 } else {
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103 Err(CommandError::Unsuccessful)
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104 }
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105 }