Allow multiple commands in a component build section

Signed-off-by: itowlson <ivan.towlson@fermyon.com>

Author: itowlson

crates/build/src/lib.rs

@@ -81,39 +81,36 @@ fn build_components(
 fn build_component(build_info: ComponentBuildInfo, app_dir: &Path) -> Result<()> {
     match build_info.build {
         Some(b) => {
-            terminal::step!(
-                "Building",
-                "component {} with `{}`",
-                build_info.id,
-                b.command
-            );
-            let workdir = construct_workdir(app_dir, b.workdir.as_ref())?;
-            if b.workdir.is_some() {
-                println!("Working directory: {}", quoted_path(&workdir));
-            }
-
-            let exit_status = Exec::shell(&b.command)
-                .cwd(workdir)
-                .stdout(Redirection::None)
-                .stderr(Redirection::None)
-                .stdin(Redirection::None)
-                .popen()
-                .map_err(|err| {
-                    anyhow!(
-                        "Cannot spawn build process '{:?}' for component {}: {}",
-                        &b.command,
+            for command in b.commands() {
+                terminal::step!("Building", "component {} with `{}`", build_info.id, command);
+                let workdir = construct_workdir(app_dir, b.workdir.as_ref())?;
+                if b.workdir.is_some() {
+                    println!("Working directory: {}", quoted_path(&workdir));
+                }
+
+                let exit_status = Exec::shell(command)
+                    .cwd(workdir)
+                    .stdout(Redirection::None)
+                    .stderr(Redirection::None)
+                    .stdin(Redirection::None)
+                    .popen()
+                    .map_err(|err| {
+                        anyhow!(
+                            "Cannot spawn build process '{:?}' for component {}: {}",
+                            &b.command,
+                            build_info.id,
+                            err
+                        )
+                    })?
+                    .wait()?;
+
+                if !exit_status.success() {
+                    bail!(
+                        "Build command for component {} failed with status {:?}",
                         build_info.id,
-                        err
-                    )
-                })?
-                .wait()?;
-
-            if !exit_status.success() {
-                bail!(
-                    "Build command for component {} failed with status {:?}",
-                    build_info.id,
-                    exit_status,
-                );
+                        exit_status,
+                    );
+                }
             }
 
             Ok(())

crates/doctor/src/rustlang/target.rs

@@ -19,7 +19,7 @@ impl Diagnostic for TargetDiagnostic {
         let uses_rust = manifest.components.values().any(|c| {
             c.build
                 .as_ref()
-                .map(|b| b.command.starts_with("cargo"))
+                .map(|b| b.commands().any(|c| c.starts_with("cargo")))
                 .unwrap_or_default()
         });
 

crates/manifest/src/schema/common.rs

@@ -83,7 +83,7 @@ pub enum WasiFilesMount {
 #[serde(deny_unknown_fields)]
 pub struct ComponentBuildConfig {
     /// `command = "cargo build"`
-    pub command: String,
+    pub command: Commands,
     /// `workdir = "components/main"
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub workdir: Option<String>,
@@ -92,6 +92,27 @@ pub struct ComponentBuildConfig {
     pub watch: Vec<String>,
 }
 
+impl ComponentBuildConfig {
+    /// The commands to execute for the build
+    pub fn commands(&self) -> impl Iterator<Item = &String> {
+        let as_vec = match &self.command {
+            Commands::Single(cmd) => vec![cmd],
+            Commands::Multiple(cmds) => cmds.iter().collect(),
+        };
+        as_vec.into_iter()
+    }
+}
+
+/// Component build command or commands
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum Commands {
+    /// `command = "cargo build"`
+    Single(String),
+    /// `command = ["cargo build", "wac encode compose-deps.wac -d my:pkg=app.wasm --registry fermyon.com"]`
+    Multiple(Vec<String>),
+}
+
 fn is_false(v: &bool) -> bool {
     !*v
 }