Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 680 insertions, 0 deletions

diff --git a/vendor/anyhow/src/lib.rs b/vendor/anyhow/src/lib.rs
new file mode 100644
index 000000000..976668aab
--- /dev/null
+++ b/vendor/anyhow/src/lib.rs
@@ -0,0 +1,680 @@
+//! [![github]](https://github.com/dtolnay/anyhow) [![crates-io]](https://crates.io/crates/anyhow) [![docs-rs]](https://docs.rs/anyhow)
+//!
+//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
+//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
+//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs
+//!
+//! <br>
+//!
+//! This library provides [`anyhow::Error`][Error], a trait object based error
+//! type for easy idiomatic error handling in Rust applications.
+//!
+//! <br>
+//!
+//! # Details
+//!
+//! - Use `Result<T, anyhow::Error>`, or equivalently `anyhow::Result<T>`, as
+//!   the return type of any fallible function.
+//!
+//!   Within the function, use `?` to easily propagate any error that implements
+//!   the `std::error::Error` trait.
+//!
+//!   ```
+//!   # pub trait Deserialize {}
+//!   #
+//!   # mod serde_json {
+//!   #     use super::Deserialize;
+//!   #     use std::io;
+//!   #
+//!   #     pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> {
+//!   #         unimplemented!()
+//!   #     }
+//!   # }
+//!   #
+//!   # struct ClusterMap;
+//!   #
+//!   # impl Deserialize for ClusterMap {}
+//!   #
+//!   use anyhow::Result;
+//!
+//!   fn get_cluster_info() -> Result<ClusterMap> {
+//!       let config = std::fs::read_to_string("cluster.json")?;
+//!       let map: ClusterMap = serde_json::from_str(&config)?;
+//!       Ok(map)
+//!   }
+//!   #
+//!   # fn main() {}
+//!   ```
+//!
+//! - Attach context to help the person troubleshooting the error understand
+//!   where things went wrong. A low-level error like "No such file or
+//!   directory" can be annoying to debug without more context about what higher
+//!   level step the application was in the middle of.
+//!
+//!   ```
+//!   # struct It;
+//!   #
+//!   # impl It {
+//!   #     fn detach(&self) -> Result<()> {
+//!   #         unimplemented!()
+//!   #     }
+//!   # }
+//!   #
+//!   use anyhow::{Context, Result};
+//!
+//!   fn main() -> Result<()> {
+//!       # return Ok(());
+//!       #
+//!       # const _: &str = stringify! {
+//!       ...
+//!       # };
+//!       #
+//!       # let it = It;
+//!       # let path = "./path/to/instrs.json";
+//!       #
+//!       it.detach().context("Failed to detach the important thing")?;
+//!
+//!       let content = std::fs::read(path)
+//!           .with_context(|| format!("Failed to read instrs from {}", path))?;
+//!       #
+//!       # const _: &str = stringify! {
+//!       ...
+//!       # };
+//!       #
+//!       # Ok(())
+//!   }
+//!   ```
+//!
+//!   ```console
+//!   Error: Failed to read instrs from ./path/to/instrs.json
+//!
+//!   Caused by:
+//!       No such file or directory (os error 2)
+//!   ```
+//!
+//! - Downcasting is supported and can be by value, by shared reference, or by
+//!   mutable reference as needed.
+//!
+//!   ```
+//!   # use anyhow::anyhow;
+//!   # use std::fmt::{self, Display};
+//!   # use std::task::Poll;
+//!   #
+//!   # #[derive(Debug)]
+//!   # enum DataStoreError {
+//!   #     Censored(()),
+//!   # }
+//!   #
+//!   # impl Display for DataStoreError {
+//!   #     fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+//!   #         unimplemented!()
+//!   #     }
+//!   # }
+//!   #
+//!   # impl std::error::Error for DataStoreError {}
+//!   #
+//!   # const REDACTED_CONTENT: () = ();
+//!   #
+//!   # let error = anyhow!("...");
+//!   # let root_cause = &error;
+//!   #
+//!   # let ret =
+//!   // If the error was caused by redaction, then return a
+//!   // tombstone instead of the content.
+//!   match root_cause.downcast_ref::<DataStoreError>() {
+//!       Some(DataStoreError::Censored(_)) => Ok(Poll::Ready(REDACTED_CONTENT)),
+//!       None => Err(error),
+//!   }
+//!   # ;
+//!   ```
+//!
+//! - If using the nightly channel, or stable with `features = ["backtrace"]`, a
+//!   backtrace is captured and printed with the error if the underlying error
+//!   type does not already provide its own. In order to see backtraces, they
+//!   must be enabled through the environment variables described in
+//!   [`std::backtrace`]:
+//!
+//!   - If you want panics and errors to both have backtraces, set
+//!     `RUST_BACKTRACE=1`;
+//!   - If you want only errors to have backtraces, set `RUST_LIB_BACKTRACE=1`;
+//!   - If you want only panics to have backtraces, set `RUST_BACKTRACE=1` and
+//!     `RUST_LIB_BACKTRACE=0`.
+//!
+//!   The tracking issue for this feature is [rust-lang/rust#53487].
+//!
+//!   [`std::backtrace`]: https://doc.rust-lang.org/std/backtrace/index.html#environment-variables
+//!   [rust-lang/rust#53487]: https://github.com/rust-lang/rust/issues/53487
+//!
+//! - Anyhow works with any error type that has an impl of `std::error::Error`,
+//!   including ones defined in your crate. We do not bundle a `derive(Error)`
+//!   macro but you can write the impls yourself or use a standalone macro like
+//!   [thiserror].
+//!
+//!   [thiserror]: https://github.com/dtolnay/thiserror
+//!
+//!   ```
+//!   use thiserror::Error;
+//!
+//!   #[derive(Error, Debug)]
+//!   pub enum FormatError {
+//!       #[error("Invalid header (expected {expected:?}, got {found:?})")]
+//!       InvalidHeader {
+//!           expected: String,
+//!           found: String,
+//!       },
+//!       #[error("Missing attribute: {0}")]
+//!       MissingAttribute(String),
+//!   }
+//!   ```
+//!
+//! - One-off error messages can be constructed using the `anyhow!` macro, which
+//!   supports string interpolation and produces an `anyhow::Error`.
+//!
+//!   ```
+//!   # use anyhow::{anyhow, Result};
+//!   #
+//!   # fn demo() -> Result<()> {
+//!   #     let missing = "...";
+//!   return Err(anyhow!("Missing attribute: {}", missing));
+//!   #     Ok(())
+//!   # }
+//!   ```
+//!
+//!   A `bail!` macro is provided as a shorthand for the same early return.
+//!
+//!   ```
+//!   # use anyhow::{bail, Result};
+//!   #
+//!   # fn demo() -> Result<()> {
+//!   #     let missing = "...";
+//!   bail!("Missing attribute: {}", missing);
+//!   #     Ok(())
+//!   # }
+//!   ```
+//!
+//! <br>
+//!
+//! # No-std support
+//!
+//! In no_std mode, the same API is almost all available and works the same way.
+//! To depend on Anyhow in no_std mode, disable our default enabled "std"
+//! feature in Cargo.toml. A global allocator is required.
+//!
+//! ```toml
+//! [dependencies]
+//! anyhow = { version = "1.0", default-features = false }
+//! ```
+//!
+//! Since the `?`-based error conversions would normally rely on the
+//! `std::error::Error` trait which is only available through std, no_std mode
+//! will require an explicit `.map_err(Error::msg)` when working with a
+//! non-Anyhow error type inside a function that returns Anyhow's error type.
+
+#![doc(html_root_url = "https://docs.rs/anyhow/1.0.60")]
+#![cfg_attr(backtrace, feature(backtrace))]
+#![cfg_attr(doc_cfg, feature(doc_cfg))]
+#![cfg_attr(not(feature = "std"), no_std)]
+#![deny(dead_code, unused_imports, unused_mut)]
+#![allow(
+    clippy::doc_markdown,
+    clippy::enum_glob_use,
+    clippy::explicit_auto_deref,
+    clippy::missing_errors_doc,
+    clippy::missing_panics_doc,
+    clippy::module_name_repetitions,
+    clippy::must_use_candidate,
+    clippy::needless_doctest_main,
+    clippy::new_ret_no_self,
+    clippy::redundant_else,
+    clippy::return_self_not_must_use,
+    clippy::unused_self,
+    clippy::used_underscore_binding,
+    clippy::wildcard_imports,
+    clippy::wrong_self_convention
+)]
+
+extern crate alloc;
+
+#[macro_use]
+mod backtrace;
+mod chain;
+mod context;
+mod ensure;
+mod error;
+mod fmt;
+mod kind;
+mod macros;
+mod ptr;
+mod wrapper;
+
+use crate::error::ErrorImpl;
+use crate::ptr::Own;
+use core::fmt::Display;
+
+#[cfg(not(feature = "std"))]
+use core::fmt::Debug;
+
+#[cfg(feature = "std")]
+use std::error::Error as StdError;
+
+#[cfg(not(feature = "std"))]
+trait StdError: Debug + Display {
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
+        None
+    }
+}
+
+pub use anyhow as format_err;
+
+/// The `Error` type, a wrapper around a dynamic error type.
+///
+/// `Error` works a lot like `Box<dyn std::error::Error>`, but with these
+/// differences:
+///
+/// - `Error` requires that the error is `Send`, `Sync`, and `'static`.
+/// - `Error` guarantees that a backtrace is available, even if the underlying
+///   error type does not provide one.
+/// - `Error` is represented as a narrow pointer &mdash; exactly one word in
+///   size instead of two.
+///
+/// <br>
+///
+/// # Display representations
+///
+/// When you print an error object using "{}" or to_string(), only the outermost
+/// underlying error or context is printed, not any of the lower level causes.
+/// This is exactly as if you had called the Display impl of the error from
+/// which you constructed your anyhow::Error.
+///
+/// ```console
+/// Failed to read instrs from ./path/to/instrs.json
+/// ```
+///
+/// To print causes as well using anyhow's default formatting of causes, use the
+/// alternate selector "{:#}".
+///
+/// ```console
+/// Failed to read instrs from ./path/to/instrs.json: No such file or directory (os error 2)
+/// ```
+///
+/// The Debug format "{:?}" includes your backtrace if one was captured. Note
+/// that this is the representation you get by default if you return an error
+/// from `fn main` instead of printing it explicitly yourself.
+///
+/// ```console
+/// Error: Failed to read instrs from ./path/to/instrs.json
+///
+/// Caused by:
+///     No such file or directory (os error 2)
+/// ```
+///
+/// and if there is a backtrace available:
+///
+/// ```console
+/// Error: Failed to read instrs from ./path/to/instrs.json
+///
+/// Caused by:
+///     No such file or directory (os error 2)
+///
+/// Stack backtrace:
+///    0: <E as anyhow::context::ext::StdError>::ext_context
+///              at /git/anyhow/src/backtrace.rs:26
+///    1: core::result::Result<T,E>::map_err
+///              at /git/rustc/src/libcore/result.rs:596
+///    2: anyhow::context::<impl anyhow::Context<T,E> for core::result::Result<T,E>>::with_context
+///              at /git/anyhow/src/context.rs:58
+///    3: testing::main
+///              at src/main.rs:5
+///    4: std::rt::lang_start
+///              at /git/rustc/src/libstd/rt.rs:61
+///    5: main
+///    6: __libc_start_main
+///    7: _start
+/// ```
+///
+/// To see a conventional struct-style Debug representation, use "{:#?}".
+///
+/// ```console
+/// Error {
+///     context: "Failed to read instrs from ./path/to/instrs.json",
+///     source: Os {
+///         code: 2,
+///         kind: NotFound,
+///         message: "No such file or directory",
+///     },
+/// }
+/// ```
+///
+/// If none of the built-in representations are appropriate and you would prefer
+/// to render the error and its cause chain yourself, it can be done something
+/// like this:
+///
+/// ```
+/// use anyhow::{Context, Result};
+///
+/// fn main() {
+///     if let Err(err) = try_main() {
+///         eprintln!("ERROR: {}", err);
+///         err.chain().skip(1).for_each(|cause| eprintln!("because: {}", cause));
+///         std::process::exit(1);
+///     }
+/// }
+///
+/// fn try_main() -> Result<()> {
+///     # const IGNORE: &str = stringify! {
+///     ...
+///     # };
+///     # Ok(())
+/// }
+/// ```
+#[repr(transparent)]
+pub struct Error {
+    inner: Own<ErrorImpl>,
+}
+
+/// Iterator of a chain of source errors.
+///
+/// This type is the iterator returned by [`Error::chain`].
+///
+/// # Example
+///
+/// ```
+/// use anyhow::Error;
+/// use std::io;
+///
+/// pub fn underlying_io_error_kind(error: &Error) -> Option<io::ErrorKind> {
+///     for cause in error.chain() {
+///         if let Some(io_error) = cause.downcast_ref::<io::Error>() {
+///             return Some(io_error.kind());
+///         }
+///     }
+///     None
+/// }
+/// ```
+#[cfg(feature = "std")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "std")))]
+#[derive(Clone)]
+pub struct Chain<'a> {
+    state: crate::chain::ChainState<'a>,
+}
+
+/// `Result<T, Error>`
+///
+/// This is a reasonable return type to use throughout your application but also
+/// for `fn main`; if you do, failures will be printed along with any
+/// [context][Context] and a backtrace if one was captured.
+///
+/// `anyhow::Result` may be used with one *or* two type parameters.
+///
+/// ```rust
+/// use anyhow::Result;
+///
+/// # const IGNORE: &str = stringify! {
+/// fn demo1() -> Result<T> {...}
+///            // ^ equivalent to std::result::Result<T, anyhow::Error>
+///
+/// fn demo2() -> Result<T, OtherError> {...}
+///            // ^ equivalent to std::result::Result<T, OtherError>
+/// # };
+/// ```
+///
+/// # Example
+///
+/// ```
+/// # pub trait Deserialize {}
+/// #
+/// # mod serde_json {
+/// #     use super::Deserialize;
+/// #     use std::io;
+/// #
+/// #     pub fn from_str<T: Deserialize>(json: &str) -> io::Result<T> {
+/// #         unimplemented!()
+/// #     }
+/// # }
+/// #
+/// # #[derive(Debug)]
+/// # struct ClusterMap;
+/// #
+/// # impl Deserialize for ClusterMap {}
+/// #
+/// use anyhow::Result;
+///
+/// fn main() -> Result<()> {
+///     # return Ok(());
+///     let config = std::fs::read_to_string("cluster.json")?;
+///     let map: ClusterMap = serde_json::from_str(&config)?;
+///     println!("cluster info: {:#?}", map);
+///     Ok(())
+/// }
+/// ```
+pub type Result<T, E = Error> = core::result::Result<T, E>;
+
+/// Provides the `context` method for `Result`.
+///
+/// This trait is sealed and cannot be implemented for types outside of
+/// `anyhow`.
+///
+/// <br>
+///
+/// # Example
+///
+/// ```
+/// use anyhow::{Context, Result};
+/// use std::fs;
+/// use std::path::PathBuf;
+///
+/// pub struct ImportantThing {
+///     path: PathBuf,
+/// }
+///
+/// impl ImportantThing {
+///     # const IGNORE: &'static str = stringify! {
+///     pub fn detach(&mut self) -> Result<()> {...}
+///     # };
+///     # fn detach(&mut self) -> Result<()> {
+///     #     unimplemented!()
+///     # }
+/// }
+///
+/// pub fn do_it(mut it: ImportantThing) -> Result<Vec<u8>> {
+///     it.detach().context("Failed to detach the important thing")?;
+///
+///     let path = &it.path;
+///     let content = fs::read(path)
+///         .with_context(|| format!("Failed to read instrs from {}", path.display()))?;
+///
+///     Ok(content)
+/// }
+/// ```
+///
+/// When printed, the outermost context would be printed first and the lower
+/// level underlying causes would be enumerated below.
+///
+/// ```console
+/// Error: Failed to read instrs from ./path/to/instrs.json
+///
+/// Caused by:
+///     No such file or directory (os error 2)
+/// ```
+///
+/// Refer to the [Display representations] documentation for other forms in
+/// which this context chain can be rendered.
+///
+/// [Display representations]: Error#display-representations
+///
+/// <br>
+///
+/// # Effect on downcasting
+///
+/// After attaching context of type `C` onto an error of type `E`, the resulting
+/// `anyhow::Error` may be downcast to `C` **or** to `E`.
+///
+/// That is, in codebases that rely on downcasting, Anyhow's context supports
+/// both of the following use cases:
+///
+///   - **Attaching context whose type is insignificant onto errors whose type
+///     is used in downcasts.**
+///
+///     In other error libraries whose context is not designed this way, it can
+///     be risky to introduce context to existing code because new context might
+///     break existing working downcasts. In Anyhow, any downcast that worked
+///     before adding context will continue to work after you add a context, so
+///     you should freely add human-readable context to errors wherever it would
+///     be helpful.
+///
+///     ```
+///     # use anyhow::bail;
+///     # use thiserror::Error;
+///     #
+///     # #[derive(Error, Debug)]
+///     # #[error("???")]
+///     # struct SuspiciousError;
+///     #
+///     # fn helper() -> Result<()> {
+///     #     bail!(SuspiciousError);
+///     # }
+///     #
+///     use anyhow::{Context, Result};
+///
+///     fn do_it() -> Result<()> {
+///         helper().context("Failed to complete the work")?;
+///         # const IGNORE: &str = stringify! {
+///         ...
+///         # };
+///         # unreachable!()
+///     }
+///
+///     fn main() {
+///         let err = do_it().unwrap_err();
+///         if let Some(e) = err.downcast_ref::<SuspiciousError>() {
+///             // If helper() returned SuspiciousError, this downcast will
+///             // correctly succeed even with the context in between.
+///             # return;
+///         }
+///         # panic!("expected downcast to succeed");
+///     }
+///     ```
+///
+///   - **Attaching context whose type is used in downcasts onto errors whose
+///     type is insignificant.**
+///
+///     Some codebases prefer to use machine-readable context to categorize
+///     lower level errors in a way that will be actionable to higher levels of
+///     the application.
+///
+///     ```
+///     # use anyhow::bail;
+///     # use thiserror::Error;
+///     #
+///     # #[derive(Error, Debug)]
+///     # #[error("???")]
+///     # struct HelperFailed;
+///     #
+///     # fn helper() -> Result<()> {
+///     #     bail!("no such file or directory");
+///     # }
+///     #
+///     use anyhow::{Context, Result};
+///
+///     fn do_it() -> Result<()> {
+///         helper().context(HelperFailed)?;
+///         # const IGNORE: &str = stringify! {
+///         ...
+///         # };
+///         # unreachable!()
+///     }
+///
+///     fn main() {
+///         let err = do_it().unwrap_err();
+///         if let Some(e) = err.downcast_ref::<HelperFailed>() {
+///             // If helper failed, this downcast will succeed because
+///             // HelperFailed is the context that has been attached to
+///             // that error.
+///             # return;
+///         }
+///         # panic!("expected downcast to succeed");
+///     }
+///     ```
+pub trait Context<T, E>: context::private::Sealed {
+    /// Wrap the error value with additional context.
+    fn context<C>(self, context: C) -> Result<T, Error>
+    where
+        C: Display + Send + Sync + 'static;
+
+    /// Wrap the error value with additional context that is evaluated lazily
+    /// only once an error does occur.
+    fn with_context<C, F>(self, f: F) -> Result<T, Error>
+    where
+        C: Display + Send + Sync + 'static,
+        F: FnOnce() -> C;
+}
+
+/// Equivalent to Ok::<_, anyhow::Error>(value).
+///
+/// This simplifies creation of an anyhow::Result in places where type inference
+/// cannot deduce the `E` type of the result &mdash; without needing to write
+/// `Ok::<_, anyhow::Error>(value)`.
+///
+/// One might think that `anyhow::Result::Ok(value)` would work in such cases
+/// but it does not.
+///
+/// ```console
+/// error[E0282]: type annotations needed for `std::result::Result<i32, E>`
+///   --> src/main.rs:11:13
+///    |
+/// 11 |     let _ = anyhow::Result::Ok(1);
+///    |         -   ^^^^^^^^^^^^^^^^^^ cannot infer type for type parameter `E` declared on the enum `Result`
+///    |         |
+///    |         consider giving this pattern the explicit type `std::result::Result<i32, E>`, where the type parameter `E` is specified
+/// ```
+#[allow(non_snake_case)]
+pub fn Ok<T>(t: T) -> Result<T> {
+    Result::Ok(t)
+}
+
+// Not public API. Referenced by macro-generated code.
+#[doc(hidden)]
+pub mod private {
+    use crate::Error;
+    use alloc::fmt;
+    use core::fmt::Arguments;
+
+    pub use crate::ensure::{BothDebug, NotBothDebug};
+    pub use alloc::format;
+    pub use core::result::Result::Err;
+    pub use core::{concat, format_args, stringify};
+
+    #[doc(hidden)]
+    pub mod kind {
+        pub use crate::kind::{AdhocKind, TraitKind};
+
+        #[cfg(feature = "std")]
+        pub use crate::kind::BoxedKind;
+    }
+
+    #[doc(hidden)]
+    #[inline]
+    #[cold]
+    pub fn format_err(args: Arguments) -> Error {
+        #[cfg(anyhow_no_fmt_arguments_as_str)]
+        let fmt_arguments_as_str = None::<&str>;
+        #[cfg(not(anyhow_no_fmt_arguments_as_str))]
+        let fmt_arguments_as_str = args.as_str();
+
+        if let Some(message) = fmt_arguments_as_str {
+            // anyhow!("literal"), can downcast to &'static str
+            Error::msg(message)
+        } else {
+            // anyhow!("interpolate {var}"), can downcast to String
+            Error::msg(fmt::format(args))
+        }
+    }
+
+    #[doc(hidden)]
+    #[inline]
+    #[cold]
+    #[must_use]
+    pub fn must_use(error: Error) -> Error {
+        error
+    }
+}