Initial commit

src/errors.rs

@@ -0,0 +1,63 @@
+use std::path::PathBuf;
+
+#[derive(Debug)]
+pub enum SandboxError {
+    HomeNotSet,
+    BwrapNotFound,
+    CommandNotFound(PathBuf),
+    CommandNotExecutable(PathBuf),
+    RwPathMissing(PathBuf),
+    RoPathMissing(PathBuf),
+    ChdirMissing(PathBuf),
+    CurrentDirUnavailable(std::io::Error),
+    GlobPattern(glob::PatternError),
+    Io(std::io::Error),
+}
+
+impl std::fmt::Display for SandboxError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::HomeNotSet => write!(
+                f,
+                "$HOME is not set; cannot determine which paths to protect"
+            ),
+            Self::BwrapNotFound => write!(
+                f,
+                "bwrap not found; install bubblewrap (e.g. `apt install bubblewrap` or `pacman -S bubblewrap`)"
+            ),
+            Self::CommandNotFound(p) => write!(f, "command not found: {}", p.display()),
+            Self::CommandNotExecutable(p) => {
+                write!(f, "command is not executable: {}", p.display())
+            }
+            Self::RwPathMissing(p) => write!(f, "--rw path does not exist: {}", p.display()),
+            Self::RoPathMissing(p) => write!(f, "--ro path does not exist: {}", p.display()),
+            Self::ChdirMissing(p) => write!(f, "--chdir path does not exist: {}", p.display()),
+            Self::CurrentDirUnavailable(e) => write!(f, "cannot determine current directory: {e}"),
+            Self::GlobPattern(e) => write!(f, "invalid glob pattern: {e}"),
+            Self::Io(e) => write!(f, "I/O error: {e}"),
+        }
+    }
+}
+
+impl std::error::Error for SandboxError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::CurrentDirUnavailable(e) => Some(e),
+            Self::GlobPattern(e) => Some(e),
+            Self::Io(e) => Some(e),
+            _ => None,
+        }
+    }
+}
+
+impl From<std::io::Error> for SandboxError {
+    fn from(e: std::io::Error) -> Self {
+        Self::Io(e)
+    }
+}
+
+impl From<glob::PatternError> for SandboxError {
+    fn from(e: glob::PatternError) -> Self {
+        Self::GlobPattern(e)
+    }
+}