diff --git a/src/command.rs b/src/command.rs
index 5922445..ba3c6e2 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -28,7 +28,7 @@ pub struct System {
     // exclusive_with : List
 }
 
-#[derive(Debug, Serialize, Deserialize, Clone)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 struct Cmd {
     exe: String,
     params: Vec<String>,
@@ -36,7 +36,7 @@ struct Cmd {
     env: HashMap<String, String>,
 }
 
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub(crate) struct ActualCmd {
     exe: String,
     params: Vec<String>,
@@ -143,8 +143,16 @@ impl System {
     pub fn fetch(&self, opt: &Opt) -> Result<()> {
         if let Some(fetch) = &self.fetch {
             let cmd = fetch.clone().prepare(opt);
-            cmd.execute(opt)
-                .map_err(|err| MyError::new(ErrorKind::Fetch, err, cmd))?;
+            let exit_status = cmd
+                .execute(opt)
+                .map_err(|err| MyError::new(ErrorKind::Fetch, err, cmd.clone()))?;
+            if !exit_status.success() {
+                return Err(MyError::new(
+                    ErrorKind::Fetch,
+                    io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
+                    cmd.clone(),
+                ));
+            }
         }
         Ok(())
     }
@@ -152,16 +160,32 @@ impl System {
     pub fn compile(&self, opt: &Opt) -> Result<()> {
         if let Some(compile) = &self.compile {
             let cmd = compile.clone().prepare(opt);
-            cmd.execute(opt)
-                .map_err(|err| MyError::new(ErrorKind::Compile, err, cmd))?;
+            let exit_status = cmd
+                .execute(opt)
+                .map_err(|err| MyError::new(ErrorKind::Compile, err, cmd.clone()))?;
+            if !exit_status.success() {
+                return Err(MyError::new(
+                    ErrorKind::Fetch,
+                    io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
+                    cmd.clone(),
+                ));
+            }
         }
         Ok(())
     }
 
     pub fn install(&self, opt: &Opt) -> Result<()> {
         let cmd = self.install.clone().prepare(opt);
-        cmd.execute(opt)
-            .map_err(|err| MyError::new(ErrorKind::Install, err, cmd))?;
+        let exit_status = cmd
+            .execute(opt)
+            .map_err(|err| MyError::new(ErrorKind::Install, err, cmd.clone()))?;
+        if !exit_status.success() {
+            return Err(MyError::new(
+                ErrorKind::Fetch,
+                io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
+                cmd.clone(),
+            ));
+        }
         Ok(())
     }
 }