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annotate rust/hg-core/src/operations/find_root.rs @ 46154:ecbb2fc9418c

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copies-rust: rename Oracle.is_ancestor to Oracle.is_overwrite The core information that we want here is about "does information from revision X overwrite information in Y". To do so, we check is X is an ancestors of Y, but this is an implementation details, they could be other ways. We update the naming to clarify this (and align more with wording used in upcoming changesets. For people curious about other ways: for example we could record the overwrite graph as it happens and reuse that to check if X overwrite Y, without having to do potential expensive `is_ancestor` call on the revision graph. Differential Revision: https://phab.mercurial-scm.org/D9496
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Wed, 02 Dec 2020 16:11:35 +0100
parents dca9cb99971c
children 3e2d539d0d1a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use std::fmt;
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2 use std::path::{Path, PathBuf};
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3
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4 /// Kind of error encoutered by FindRoot
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5 #[derive(Debug)]
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6 pub enum FindRootErrorKind {
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7 /// Root of the repository has not been found
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8 /// Contains the current directory used by FindRoot
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9 RootNotFound(PathBuf),
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10 /// The current directory does not exists or permissions are insufficient
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11 /// to get access to it
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12 GetCurrentDirError(std::io::Error),
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13 }
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14
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15 /// A FindRoot error
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16 #[derive(Debug)]
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17 pub struct FindRootError {
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18 /// Kind of error encoutered by FindRoot
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19 pub kind: FindRootErrorKind,
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20 }
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21
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22 impl std::error::Error for FindRootError {}
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23
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24 impl fmt::Display for FindRootError {
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25 fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
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26 unimplemented!()
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27 }
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28 }
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29
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30 /// Find the root of the repository
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31 /// by searching for a .hg directory in the process’ current directory and its
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32 /// ancestors
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33 pub fn find_root() -> Result<PathBuf, FindRootError> {
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34 let current_dir = std::env::current_dir().map_err(|e| FindRootError {
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35 kind: FindRootErrorKind::GetCurrentDirError(e),
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36 })?;
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37 Ok(find_root_from_path(&current_dir)?.into())
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38 }
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39
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40 /// Find the root of the repository
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41 /// by searching for a .hg directory in the given directory and its ancestors
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42 pub fn find_root_from_path(start: &Path) -> Result<&Path, FindRootError> {
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43 if start.join(".hg").exists() {
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44 return Ok(start);
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45 }
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46 for ancestor in start.ancestors() {
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47 if ancestor.join(".hg").exists() {
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48 return Ok(ancestor);
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49 }
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50 }
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51 Err(FindRootError {
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52 kind: FindRootErrorKind::RootNotFound(start.into()),
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53 })
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54 }
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55
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56 #[cfg(test)]
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57 mod tests {
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58 use super::*;
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59 use std::fs;
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60 use tempfile;
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61
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62 #[test]
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63 fn dot_hg_not_found() {
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64 let tmp_dir = tempfile::tempdir().unwrap();
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65 let path = tmp_dir.path();
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66
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67 let err = find_root_from_path(&path).unwrap_err();
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68
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69 // TODO do something better
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70 assert!(match err {
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71 FindRootError { kind } => match kind {
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72 FindRootErrorKind::RootNotFound(p) => p == path.to_path_buf(),
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73 _ => false,
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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 #[test]
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79 fn dot_hg_in_current_path() {
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80 let tmp_dir = tempfile::tempdir().unwrap();
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81 let root = tmp_dir.path();
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82 fs::create_dir_all(root.join(".hg")).unwrap();
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83
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84 let result = find_root_from_path(&root).unwrap();
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85
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86 assert_eq!(result, root)
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87 }
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88
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89 #[test]
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90 fn dot_hg_in_parent() {
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91 let tmp_dir = tempfile::tempdir().unwrap();
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92 let root = tmp_dir.path();
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93 fs::create_dir_all(root.join(".hg")).unwrap();
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94
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95 let directory = root.join("some/nested/directory");
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96 let result = find_root_from_path(&directory).unwrap();
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97
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98 assert_eq!(result, root)
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99 }
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100 } /* tests */