Mercurial > hg
annotate rust/hg-core/src/requirements.rs @ 46443:43d63979a75e
rust: use HgError in RevlogError and Vfs
Differential Revision: https://phab.mercurial-scm.org/D9897
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 27 Jan 2021 14:45:25 +0100 |
parents | 02d3bb972121 |
children | d03b0601e0eb |
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rust: use HgError in RevlogError and Vfs
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1 use crate::errors::{HgError, HgResultExt}; |
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2 use crate::repo::Repo; |
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3 |
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4 fn parse(bytes: &[u8]) -> Result<Vec<String>, HgError> { |
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5 // The Python code reading this file uses `str.splitlines` |
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6 // which looks for a number of line separators (even including a couple of |
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7 // non-ASCII ones), but Python code writing it always uses `\n`. |
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8 let lines = bytes.split(|&byte| byte == b'\n'); |
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9 |
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10 lines |
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11 .filter(|line| !line.is_empty()) |
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12 .map(|line| { |
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13 // Python uses Unicode `str.isalnum` but feature names are all |
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14 // ASCII |
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15 if line[0].is_ascii_alphanumeric() && line.is_ascii() { |
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16 Ok(String::from_utf8(line.into()).unwrap()) |
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17 } else { |
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18 Err(HgError::corrupted("parse error in 'requires' file")) |
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19 } |
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20 }) |
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21 .collect() |
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22 } |
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23 |
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24 pub fn load(repo: &Repo) -> Result<Vec<String>, HgError> { |
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25 if let Some(bytes) = |
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26 repo.hg_vfs().read("requires").io_not_found_as_none()? |
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27 { |
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28 parse(&bytes) |
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29 } else { |
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30 // Treat a missing file the same as an empty file. |
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31 // From `mercurial/localrepo.py`: |
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32 // > requires file contains a newline-delimited list of |
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33 // > features/capabilities the opener (us) must have in order to use |
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34 // > the repository. This file was introduced in Mercurial 0.9.2, |
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35 // > which means very old repositories may not have one. We assume |
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36 // > a missing file translates to no requirements. |
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37 Ok(Vec::new()) |
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38 } |
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39 } |
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40 |
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41 pub fn check(repo: &Repo) -> Result<(), HgError> { |
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42 for feature in load(repo)? { |
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43 if !SUPPORTED.contains(&&*feature) { |
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44 // TODO: collect and all unknown features and include them in the |
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45 // error message? |
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46 return Err(HgError::UnsupportedFeature(format!( |
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47 "repository requires feature unknown to this Mercurial: {}", |
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48 feature |
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49 ))); |
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50 } |
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51 } |
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52 Ok(()) |
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53 } |
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54 |
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55 // TODO: set this to actually-supported features |
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56 const SUPPORTED: &[&str] = &[ |
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57 "dotencode", |
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58 "fncache", |
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59 "generaldelta", |
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60 "revlogv1", |
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61 "sparserevlog", |
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62 "store", |
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63 // As of this writing everything rhg does is read-only. |
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64 // When it starts writing to the repository, it’ll need to either keep the |
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65 // persistent nodemap up to date or remove this entry: |
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66 "persistent-nodemap", |
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67 ]; |