feat: compat code for non x86_64-linux

- do not build packages, which require `x86_64-linux`
- use Phala `dcap-qvl` crate for remote attestation, if possible
- nix: exclude `nixsgx` on non `x86_64-linux` platforms

Signed-off-by: Harald Hoyer <harald@matterlabs.dev>

bin/tdx-extend/src/main.rs

@@ -6,53 +6,64 @@
 #![deny(missing_docs)]
 #![deny(clippy::all)]
 
-use anyhow::{Context, Result};
-use clap::Parser;
-use teepot::{
-    log::{setup_logging, LogLevelParser},
-    tdx::rtmr::TdxRtmrEvent,
-    util::pad,
-};
-use tracing::{error, level_filters::LevelFilter};
+use tracing::error;
 
-/// Extend a TDX rtmr with a hash digest for measured boot.
-#[derive(Parser, Debug)]
-#[command(author, version, about, long_about = None)]
-struct Arguments {
-    /// digest in hex to extend the rtmr with
-    #[arg(long)]
-    digest: String,
-    /// the number or the rtmr
-    #[arg(long, default_value = "2")]
-    rtmr: u64,
-    /// Log level for the log output.
-    /// Valid values are: `off`, `error`, `warn`, `info`, `debug`, `trace`
-    #[clap(long, default_value_t = LevelFilter::WARN, value_parser = LogLevelParser)]
-    pub log_level: LevelFilter,
+#[cfg(all(target_os = "linux", target_arch = "x86_64"))]
+mod os {
+    use anyhow::{Context as _, Result};
+    use clap::Parser;
+    use teepot::{
+        log::{setup_logging, LogLevelParser},
+        tdx::rtmr::TdxRtmrEvent,
+        util::pad,
+    };
+    use tracing::level_filters::LevelFilter;
+
+    /// Extend a TDX rtmr with a hash digest for measured boot.
+    #[derive(Parser, Debug)]
+    #[command(author, version, about, long_about = None)]
+    struct Arguments {
+        /// digest in hex to extend the rtmr with
+        #[arg(long)]
+        digest: String,
+        /// the number or the rtmr
+        #[arg(long, default_value = "2")]
+        rtmr: u64,
+        /// Log level for the log output.
+        /// Valid values are: `off`, `error`, `warn`, `info`, `debug`, `trace`
+        #[clap(long, default_value_t = LevelFilter::WARN, value_parser = LogLevelParser)]
+        pub log_level: LevelFilter,
+    }
+
+    pub fn main_with_error() -> Result<()> {
+        let args = Arguments::parse();
+        tracing::subscriber::set_global_default(setup_logging(
+            env!("CARGO_CRATE_NAME"),
+            &args.log_level,
+        )?)?;
+
+        // Parse the digest string as a hex array
+        let digest_bytes = hex::decode(&args.digest).context("Invalid digest format")?;
+        let extend_data: [u8; 48] = pad(&digest_bytes).context("Invalid digest length")?;
+
+        // Extend the TDX measurement with the extend data
+        TdxRtmrEvent::default()
+            .with_extend_data(extend_data)
+            .with_rtmr_index(args.rtmr)
+            .extend()?;
+
+        Ok(())
+    }
 }
 
-fn main_with_error() -> Result<()> {
-    let args = Arguments::parse();
-    tracing::subscriber::set_global_default(setup_logging(
-        env!("CARGO_CRATE_NAME"),
-        &args.log_level,
-    )?)?;
-
-    // Parse the digest string as a hex array
-    let digest_bytes = hex::decode(&args.digest).context("Invalid digest format")?;
-    let extend_data: [u8; 48] = pad(&digest_bytes).context("Invalid digest length")?;
-
-    // Extend the TDX measurement with the extend data
-    TdxRtmrEvent::default()
-        .with_extend_data(extend_data)
-        .with_rtmr_index(args.rtmr)
-        .extend()?;
-
-    Ok(())
+#[cfg(not(all(target_os = "linux", target_arch = "x86_64")))]
+mod os {
+    pub fn main_with_error() -> anyhow::Result<()> {
+        anyhow::bail!("OS or architecture not supported");
+    }
 }
-
-fn main() -> Result<()> {
-    let ret = main_with_error();
+fn main() -> anyhow::Result<()> {
+    let ret = os::main_with_error();
     if let Err(e) = &ret {
         error!(error = %e, "Execution failed");
     }