faux-mgs: Updates expect a hubris archive instead of a raw binary

gateway/faux-mgs/Cargo.toml

@@ -13,6 +13,7 @@ slog-term = "2.9"
 termios = "0.3"
 thiserror = "1.0"
 tokio = { version = "1.20", features = ["full"] }
+zip = { version = "0.6.2", default-features = false, features = ["deflate","bzip2"] }
 
 gateway-messages = { path = "../../gateway-messages", features = ["std"] }
 gateway-sp-comms = { path = "../../gateway-sp-comms" }

gateway/faux-mgs/src/hubris_archive.rs

@@ -0,0 +1,59 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+// Copyright 2022 Oxide Computer Company
+
+//! Minimal parsing of Hubris archives.
+
+use anyhow::Context;
+use anyhow::Result;
+use std::fs;
+use std::io::Cursor;
+use std::io::Read;
+use std::path::Path;
+use std::path::PathBuf;
+use zip::ZipArchive;
+
+pub struct HubrisArchive {
+    archive: ZipArchive<Cursor<Vec<u8>>>,
+    path: PathBuf,
+}
+
+impl HubrisArchive {
+    pub fn open(path: &Path) -> Result<Self> {
+        let data = fs::read(path)
+            .with_context(|| format!("failed to read {}", path.display()))?;
+        let cursor = Cursor::new(data);
+        let archive = ZipArchive::new(cursor).with_context(|| {
+            format!(
+                "failed to open {} as a zip file - is it a hubris archive?",
+                path.display()
+            )
+        })?;
+        Ok(Self { archive, path: path.to_owned() })
+    }
+
+    pub fn final_bin(&mut self) -> Result<Vec<u8>> {
+        self.extract_by_name("img/final.bin")
+    }
+
+    fn extract_by_name(&mut self, name: &str) -> Result<Vec<u8>> {
+        let mut f = self.archive.by_name(name).with_context(|| {
+            format!(
+                "failed to find `{}` within {} - is it a hubris archive?",
+                name,
+                self.path.display()
+            )
+        })?;
+        let mut data = Vec::new();
+        f.read_to_end(&mut data).with_context(|| {
+            format!(
+                "failed to extract `{}` within {}",
+                name,
+                self.path.display()
+            )
+        })?;
+        Ok(data)
+    }
+}

gateway/faux-mgs/src/main.rs

@@ -16,14 +16,16 @@ use slog::o;
 use slog::Drain;
 use slog::Level;
 use slog::Logger;
-use std::fs;
 use std::net::SocketAddrV6;
 use std::path::PathBuf;
 use std::time::Duration;
 use tokio::net::UdpSocket;
 
+mod hubris_archive;
 mod usart;
 
+use self::hubris_archive::HubrisArchive;
+
 /// Command line program that can send MGS messages to a single SP.
 #[derive(Parser, Debug)]
 struct Args {
@@ -103,7 +105,7 @@ enum SpCommand {
     },
 
     /// Upload a new image to the SP and have it swap banks (requires reset)
-    Update { image: PathBuf },
+    Update { hubris_archive: PathBuf },
 
     /// Instruct the SP to reset.
     Reset,
@@ -187,12 +189,11 @@ async fn main() -> Result<()> {
             )
             .await?;
         }
-        Some(SpCommand::Update { image }) => {
-            let data = fs::read(&image).with_context(|| {
-                format!("failed to read image {}", image.display())
-            })?;
+        Some(SpCommand::Update { hubris_archive }) => {
+            let mut archive = HubrisArchive::open(&hubris_archive)?;
+            let data = archive.final_bin()?;
             sp.update(data).await.with_context(|| {
-                format!("updating to {} failed", image.display())
+                format!("updating to {} failed", hubris_archive.display())
             })?;
         }
         Some(SpCommand::Reset) => {