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//! Crate-level error type and exit-code mapping.
//!
//! [`AppError`] aggregates errors from every layer via `#[from]`, and
//! [`AppError::exit_code`] maps each variant to its process exit code. No
//! other module decides exit codes. Exit `1` is reserved for one meaning —
//! a check ran and found violations — while the BSD sysexits range covers
//! the tool failing to do its job at all.
use camino::Utf8PathBuf;
use thiserror::Error;
use crate::domain::marker::MarkerError;
/// Every failure the binary can exit with.
#[derive(Debug, Error)]
pub enum AppError {
/// Semantically invalid arguments clap cannot reject on shape alone.
#[error("usage: {0}")]
Usage(String),
/// A check ran to completion and found violations; the findings are
/// already on stdout, so the process only carries the red exit.
#[error("{count} violation(s) found")]
Violations {
/// How many findings were reported.
count: usize,
},
/// The target has no instance manifest where one is required.
#[error("missing manifest: {0}")]
ManifestMissing(Utf8PathBuf),
/// The manifest exists but does not parse as a supported schema.
#[error("invalid manifest: {0}")]
ManifestInvalid(String),
/// The managed pre-commit block or its host file is malformed.
#[error(transparent)]
Marker(#[from] MarkerError),
/// The install or upgrade refused to touch the target as found, and the
/// target was left (or restored) unchanged.
#[error("{0}")]
Refused(String),
/// A tracked-upstream lookup failed. The code is the sysexit the failure
/// class maps to, chosen where the `git` adapter is called.
#[error("git: {message}")]
Git {
/// The redacted failure reason.
message: String,
/// The sysexit code for this failure class.
code: u8,
},
/// Filesystem failure, classified by its I/O kind.
#[error("io: {0}")]
Io(#[from] std::io::Error),
/// Escape hatch for ad-hoc contexts at the binary boundary.
#[error(transparent)]
Other(#[from] anyhow::Error),
}
impl AppError {
/// Map to the process exit code.
///
/// `1` means a completed check found violations; `64..=78` follow BSD
/// `sysexits(3)` and mean the tool itself could not do its job.
#[must_use]
pub fn exit_code(&self) -> u8 {
match self {
Self::Violations { .. } => 1,
Self::Usage(_) => 64,
Self::ManifestInvalid(_) | Self::Marker(_) => 65,
Self::ManifestMissing(_) => 66,
Self::Refused(_) => 73,
Self::Git { code, .. } => *code,
Self::Io(e) if e.kind() == std::io::ErrorKind::NotFound => 66,
Self::Io(e) if e.kind() == std::io::ErrorKind::PermissionDenied => 77,
Self::Io(_) => 74,
Self::Other(_) => 70,
}
}
/// Stable machine-readable kind for the error envelope.
#[must_use]
pub const fn kind(&self) -> &'static str {
match self {
Self::Usage(_) => "Usage",
Self::Violations { .. } => "Violations",
Self::ManifestMissing(_) => "ManifestMissing",
Self::ManifestInvalid(_) => "ManifestInvalid",
Self::Marker(_) => "Marker",
Self::Refused(_) => "Refused",
Self::Git { .. } => "Git",
Self::Io(_) => "Io",
Self::Other(_) => "Other",
}
}
}
#[cfg(test)]
mod tests {
use super::*;
fn io(kind: std::io::ErrorKind) -> AppError {
AppError::Io(std::io::Error::from(kind))
}
#[test]
fn violations_are_one() {
assert_eq!(AppError::Violations { count: 3 }.exit_code(), 1);
}
#[test]
fn usage_is_sixty_four() {
assert_eq!(AppError::Usage("bad target".into()).exit_code(), 64);
}
#[test]
fn invalid_manifest_is_sixty_five() {
assert_eq!(
AppError::ManifestInvalid("schema_version 3".into()).exit_code(),
65
);
}
#[test]
fn malformed_marker_is_sixty_five() {
assert_eq!(AppError::Marker(MarkerError::Malformed).exit_code(), 65);
}
#[test]
fn missing_manifest_is_sixty_six() {
assert_eq!(
AppError::ManifestMissing("x/.spec-driven-docs/manifest.json".into()).exit_code(),
66
);
}
#[test]
fn refused_is_seventy_three() {
assert_eq!(
AppError::Refused("apply aborted; the target was restored".into()).exit_code(),
73
);
}
#[test]
fn not_found_io_is_sixty_six() {
assert_eq!(io(std::io::ErrorKind::NotFound).exit_code(), 66);
}
#[test]
fn permission_denied_io_is_seventy_seven() {
assert_eq!(io(std::io::ErrorKind::PermissionDenied).exit_code(), 77);
}
#[test]
fn other_io_is_seventy_four() {
assert_eq!(io(std::io::ErrorKind::BrokenPipe).exit_code(), 74);
}
#[test]
fn anyhow_is_seventy() {
assert_eq!(AppError::Other(anyhow::anyhow!("boom")).exit_code(), 70);
}
}