chore: add offline mode to cli build (#1605)

Author: luffykai

crates/cli/src/commands/build.rs

@@ -93,6 +93,9 @@ pub struct BuildArgs {
 
     #[arg(long, default_value = "release", help = "Build profile")]
     pub profile: String,
+
+    #[arg(long, default_value = "false", help = "use --offline in cargo build")]
+    pub offline: bool,
 }
 
 #[derive(Clone, Default, clap::Args)]
@@ -127,6 +130,9 @@ pub(crate) fn build(build_args: &BuildArgs) -> Result<Option<PathBuf>> {
         .with_features(build_args.features.clone())
         .with_profile(build_args.profile.clone());
     guest_options.target_dir = build_args.target_dir.clone();
+    if build_args.offline {
+        guest_options.options = vec!["--offline".to_string()];
+    }
 
     let pkg = get_package(&build_args.manifest_dir);
     // We support builds of libraries with 0 or >1 executables.
@@ -215,6 +221,7 @@ mod tests {
             exe_commit_output: PathBuf::from(DEFAULT_EXE_COMMIT_PATH),
             profile: "dev".to_string(),
             target_dir: Some(target_dir.to_path_buf()),
+            offline: false,
         };
         build(&build_args)?;
         assert!(

crates/toolchain/build/src/config.rs

@@ -17,7 +17,7 @@ pub struct GuestOptions {
     /// Target directory
     pub target_dir: Option<PathBuf>,
     /// Custom options to pass as args to `cargo build`.
-    pub(crate) options: Vec<String>,
+    pub options: Vec<String>,
 }
 
 impl GuestOptions {