chore(xen): split platform support into separate crate (#195)

crates/xen/xenplatform/src/error.rs

@@ -0,0 +1,43 @@
+use std::io;
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("io issue encountered: {0}")]
+    Io(#[from] io::Error),
+    #[error("xencall issue encountered: {0}")]
+    XenCall(#[from] xencall::error::Error),
+    #[error("domain does not have a tty")]
+    TtyNotFound,
+    #[error("introducing the domain failed")]
+    IntroduceDomainFailed,
+    #[error("string conversion of a path failed")]
+    PathStringConversion,
+    #[error("parent of path not found")]
+    PathParentNotFound,
+    #[error("domain does not exist")]
+    DomainNonExistent,
+    #[error("elf parse failed: {0}")]
+    ElfParseFailed(#[from] elf::ParseError),
+    #[error("mmap failed")]
+    MmapFailed,
+    #[error("munmap failed: {0}")]
+    UnmapFailed(nix::errno::Errno),
+    #[error("memory setup failed: {0}")]
+    MemorySetupFailed(&'static str),
+    #[error("populate physmap failed: wanted={0}, received={1}, input_extents={2}")]
+    PopulatePhysmapFailed(usize, usize, usize),
+    #[error("unknown elf compression method")]
+    ElfCompressionUnknown,
+    #[error("expected elf image format not found")]
+    ElfInvalidImage,
+    #[error("provided elf image does not contain xen support")]
+    ElfXenSupportMissing,
+    #[error("regex error: {0}")]
+    RegexError(#[from] regex::Error),
+    #[error("error: {0}")]
+    GenericError(String),
+    #[error("failed to parse int: {0}")]
+    ParseIntError(#[from] std::num::ParseIntError),
+}
+
+pub type Result<T> = std::result::Result<T, Error>;