mercurial-scm/hg: rust/hg-core/src/errors.rs annotate

annotate rust/hg-core/src/errors.rs @ 47123:d8ac62374943

dirstate-tree: Make `DirstateMap` borrow from a bytes buffer ? that has the contents of the `.hg/dirstate` file. This only applies to the tree-based flavor of `DirstateMap`. For now only the entire `&[u8]` slice is stored, so this is not useful yet. Adding a lifetime parameter to the `DirstateMap` struct (in hg-core) makes Python bindings non-trivial because we keep that struct in a Python object that has a dynamic lifetime tied to Python?s reference-counting and GC. As long as we keep the `PyBytes` that owns the borrowed bytes buffer next to the borrowing struct, the buffer will live long enough for the borrows to stay valid. However this relationship cannot be expressed in safe Rust code in a way that would statisfy they borrow-checker. We use `unsafe` code to erase that lifetime parameter, and encapsulate it in a safe abstraction similar to the owning-ref crate: https://docs.rs/owning_ref/ Differential Revision: https://phab.mercurial-scm.org/D10557

author	Simon Sapin <simon.sapin@octobus.net>
date	Fri, 30 Apr 2021 18:24:54 +0200
parents	bcdcb4423ae3
children	6e49769b7f97

rev	line source
46598 bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	1 use crate::config::ConfigValueParseError;
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	2 use std::fmt;
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	3
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	4 /// Common error cases that can happen in many different APIs
46598 bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	5 #[derive(Debug, derive_more::From)]
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	6 pub enum HgError {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	7 IoError {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	8 error: std::io::Error,
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	9 context: IoErrorContext,
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	10 },
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	11
46485 f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	12 /// A file under `.hg/` normally only written by Mercurial is not in the
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	13 /// expected format. This indicates a bug in Mercurial, filesystem
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	14 /// corruption, or hardware failure.
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	15 ///
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	16 /// The given string is a short explanation for users, not intended to be
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	17 /// machine-readable.
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	18 CorruptedRepository(String),
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	19
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	20 /// The respository or requested operation involves a feature not
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	21 /// supported by the Rust implementation. Falling back to the Python
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	22 /// implementation may or may not work.
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	23 ///
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	24 /// The given string is a short explanation for users, not intended to be
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	25 /// machine-readable.
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	26 UnsupportedFeature(String),
46485 f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	27
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	28 /// Operation cannot proceed for some other reason.
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	29 ///
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	30 /// The given string is a short explanation for users, not intended to be
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	31 /// machine-readable.
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	32 Abort(String),
46598 bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	33
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	34 /// A configuration value is not in the expected syntax.
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	35 ///
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	36 /// These errors can happen in many places in the code because values are
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	37 /// parsed lazily as the file-level parser does not know the expected type
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	38 /// and syntax of each value.
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	39 #[from]
bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	40 ConfigValueParseError(ConfigValueParseError),
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	41 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	42
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	43 /// Details about where an I/O error happened
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	44 #[derive(Debug)]
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	45 pub enum IoErrorContext {
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	46 ReadingFile(std::path::PathBuf),
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	47 WritingFile(std::path::PathBuf),
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	48 RemovingFile(std::path::PathBuf),
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	49 RenamingFile {
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	50 from: std::path::PathBuf,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	51 to: std::path::PathBuf,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	52 },
46740 97ac588b6d9e rhg: Don?t make repository path absolute too early Simon Sapin <simon.sapin@octobus.net> parents: 46735 diff changeset	53 /// `std::fs::canonicalize`
97ac588b6d9e rhg: Don?t make repository path absolute too early Simon Sapin <simon.sapin@octobus.net> parents: 46735 diff changeset	54 CanonicalizingPath(std::path::PathBuf),
46483 2845892dd489 rust: Parse system and user configuration Simon Sapin <simon.sapin@octobus.net> parents: 46462 diff changeset	55 /// `std::env::current_dir`
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	56 CurrentDir,
46483 2845892dd489 rust: Parse system and user configuration Simon Sapin <simon.sapin@octobus.net> parents: 46462 diff changeset	57 /// `std::env::current_exe`
2845892dd489 rust: Parse system and user configuration Simon Sapin <simon.sapin@octobus.net> parents: 46462 diff changeset	58 CurrentExe,
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	59 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	60
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	61 impl HgError {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	62 pub fn corrupted(explanation: impl Into<String>) -> Self {
46443 43d63979a75e rust: use HgError in RevlogError and Vfs Simon Sapin <simon.sapin@octobus.net> parents: 46438 diff changeset	63 // TODO: capture a backtrace here and keep it in the error value
43d63979a75e rust: use HgError in RevlogError and Vfs Simon Sapin <simon.sapin@octobus.net> parents: 46438 diff changeset	64 // to aid debugging?
43d63979a75e rust: use HgError in RevlogError and Vfs Simon Sapin <simon.sapin@octobus.net> parents: 46438 diff changeset	65 // https://doc.rust-lang.org/std/backtrace/struct.Backtrace.html
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	66 HgError::CorruptedRepository(explanation.into())
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	67 }
46462 d03b0601e0eb rhg: initial support for shared repositories Simon Sapin <simon.sapin@octobus.net> parents: 46443 diff changeset	68
d03b0601e0eb rhg: initial support for shared repositories Simon Sapin <simon.sapin@octobus.net> parents: 46443 diff changeset	69 pub fn unsupported(explanation: impl Into<String>) -> Self {
d03b0601e0eb rhg: initial support for shared repositories Simon Sapin <simon.sapin@octobus.net> parents: 46443 diff changeset	70 HgError::UnsupportedFeature(explanation.into())
d03b0601e0eb rhg: initial support for shared repositories Simon Sapin <simon.sapin@octobus.net> parents: 46443 diff changeset	71 }
46485 f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	72 pub fn abort(explanation: impl Into<String>) -> Self {
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	73 HgError::Abort(explanation.into())
f031fe1c6ede rhg: Abort based on config on share-safe mismatch Simon Sapin <simon.sapin@octobus.net> parents: 46483 diff changeset	74 }
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	75 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	76
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	77 // TODO: use `DisplayBytes` instead to show non-Unicode filenames losslessly?
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	78 impl fmt::Display for HgError {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	79 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	80 match self {
46598 bc08c2331f99 rust: Add a `ConfigValueParseError` variant to common errors Simon Sapin <simon.sapin@octobus.net> parents: 46485 diff changeset	81 HgError::Abort(explanation) => write!(f, "{}", explanation),
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	82 HgError::IoError { error, context } => {
46731 3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	83 write!(f, "abort: {}: {}", context, error)
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	84 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	85 HgError::CorruptedRepository(explanation) => {
46735 12d59eec7f1d rhg: Align with Python on some more error messages Simon Sapin <simon.sapin@octobus.net> parents: 46731 diff changeset	86 write!(f, "abort: {}", explanation)
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	87 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	88 HgError::UnsupportedFeature(explanation) => {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	89 write!(f, "unsupported feature: {}", explanation)
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	90 }
46797 bcdcb4423ae3 rhg: Add more conversions between error types Simon Sapin <simon.sapin@octobus.net> parents: 46740 diff changeset	91 HgError::ConfigValueParseError(error) => error.fmt(f),
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	92 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	93 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	94 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	95
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	96 // TODO: use `DisplayBytes` instead to show non-Unicode filenames losslessly?
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	97 impl fmt::Display for IoErrorContext {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	98 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	99 match self {
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	100 IoErrorContext::ReadingFile(path) => {
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	101 write!(f, "when reading {}", path.display())
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	102 }
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	103 IoErrorContext::WritingFile(path) => {
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	104 write!(f, "when writing {}", path.display())
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	105 }
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	106 IoErrorContext::RemovingFile(path) => {
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	107 write!(f, "when removing {}", path.display())
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	108 }
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	109 IoErrorContext::RenamingFile { from, to } => write!(
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	110 f,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	111 "when renaming {} to {}",
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	112 from.display(),
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	113 to.display()
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	114 ),
46740 97ac588b6d9e rhg: Don?t make repository path absolute too early Simon Sapin <simon.sapin@octobus.net> parents: 46735 diff changeset	115 IoErrorContext::CanonicalizingPath(path) => {
97ac588b6d9e rhg: Don?t make repository path absolute too early Simon Sapin <simon.sapin@octobus.net> parents: 46735 diff changeset	116 write!(f, "when canonicalizing {}", path.display())
97ac588b6d9e rhg: Don?t make repository path absolute too early Simon Sapin <simon.sapin@octobus.net> parents: 46735 diff changeset	117 }
46731 3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	118 IoErrorContext::CurrentDir => {
3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	119 write!(f, "error getting current working directory")
3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	120 }
3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	121 IoErrorContext::CurrentExe => {
3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	122 write!(f, "error getting current executable")
3d692e724d06 rhg: Align config file parse error formatting with Python Simon Sapin <simon.sapin@octobus.net> parents: 46599 diff changeset	123 }
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	124 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	125 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	126 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	127
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	128 pub trait IoResultExt<T> {
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	129 /// Annotate a possible I/O error as related to a reading a file at the
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	130 /// given path.
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	131 ///
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	132 /// This allows printing something like “File not found when reading
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	133 /// example.txt” instead of just “File not found”.
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	134 ///
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	135 /// Converts a `Result` with `std::io::Error` into one with `HgError`.
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	136 fn when_reading_file(self, path: &std::path::Path) -> Result<T, HgError>;
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	137
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	138 fn with_context(
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	139 self,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	140 context: impl FnOnce() -> IoErrorContext,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	141 ) -> Result<T, HgError>;
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	142 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	143
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	144 impl<T> IoResultExt<T> for std::io::Result<T> {
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	145 fn when_reading_file(self, path: &std::path::Path) -> Result<T, HgError> {
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	146 self.with_context(\|\| IoErrorContext::ReadingFile(path.to_owned()))
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	147 }
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	148
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	149 fn with_context(
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	150 self,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	151 context: impl FnOnce() -> IoErrorContext,
1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	152 ) -> Result<T, HgError> {
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	153 self.map_err(\|error\| HgError::IoError {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	154 error,
46599 1f55cd5b292f rust: Add a log file rotation utility Simon Sapin <simon.sapin@octobus.net> parents: 46598 diff changeset	155 context: context(),
46438 39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	156 })
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	157 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	158 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	159
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	160 pub trait HgResultExt<T> {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	161 /// Handle missing files separately from other I/O error cases.
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	162 ///
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	163 /// Wraps the `Ok` type in an `Option`:
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	164 ///
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	165 /// * `Ok(x)` becomes `Ok(Some(x))`
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	166 /// * An I/O "not found" error becomes `Ok(None)`
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	167 /// * Other errors are unchanged
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	168 fn io_not_found_as_none(self) -> Result<Option<T>, HgError>;
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	169 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	170
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	171 impl<T> HgResultExt<T> for Result<T, HgError> {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	172 fn io_not_found_as_none(self) -> Result<Option<T>, HgError> {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	173 match self {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	174 Ok(x) => Ok(Some(x)),
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	175 Err(HgError::IoError { error, .. })
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	176 if error.kind() == std::io::ErrorKind::NotFound =>
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	177 {
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	178 Ok(None)
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	179 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	180 Err(other_error) => Err(other_error),
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	181 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	182 }
39e9407820ac rust: Introduce an `HgError` enum for common error cases Simon Sapin <simon.sapin@octobus.net> parents: diff changeset	183 }

Mercurial > public > mercurial-scm > hg

annotate rust/hg-core/src/errors.rs @ 47123:d8ac62374943