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annotate rust/rhg/src/commands/debugrequirements.rs @ 45923:ead435aa5294

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rhg: add a `debugrequirements` subcommand For now it only prints the contents of `.hg/requires` as-is, without parsing. Differential Revision: https://phab.mercurial-scm.org/D9397
author Simon Sapin <simon-commits@exyr.org>
date Tue, 24 Nov 2020 15:11:58 +0100
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children a2eda1ff22aa
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45923
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1 use crate::commands::Command;
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2 use crate::error::{CommandError, CommandErrorKind};
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3 use crate::ui::Ui;
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4 use hg::operations::FindRoot;
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5
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6 pub const HELP_TEXT: &str = "
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7 Print the current repo requirements.
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8 ";
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9
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10 pub struct DebugRequirementsCommand {}
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11
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12 impl DebugRequirementsCommand {
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13 pub fn new() -> Self {
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14 DebugRequirementsCommand {}
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15 }
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16 }
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17
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18 impl Command for DebugRequirementsCommand {
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19 fn run(&self, ui: &Ui) -> Result<(), CommandError> {
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20 let root = FindRoot::new().run()?;
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21 let requires = root.join(".hg").join("requires");
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22 let requirements = match std::fs::read(requires) {
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23 Ok(bytes) => bytes,
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24
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25 // Treat a missing file the same as an empty file.
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26 // From `mercurial/localrepo.py`:
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27 // > requires file contains a newline-delimited list of
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28 // > features/capabilities the opener (us) must have in order to use
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29 // > the repository. This file was introduced in Mercurial 0.9.2,
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30 // > which means very old repositories may not have one. We assume
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31 // > a missing file translates to no requirements.
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32 Err(error) if error.kind() == std::io::ErrorKind::NotFound => Vec::new(),
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33
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34 Err(error) => Err(CommandErrorKind::FileError(error))?,
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35 };
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36
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37 ui.write_stdout(&requirements)?;
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38 Ok(())
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39 }
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40 }