chroot: set exit codes to 125, 126 or 127 for errors from chroot itself

src/uu/chroot/src/chroot.rs

@@ -80,7 +80,14 @@ pub fn uumain(args: impl uucore::Args) -> UResult<()> {
         .status()
     {
         Ok(status) => status,
-        Err(e) => return Err(ChrootError::CommandFailed(command[0].to_string(), e).into()),
+        Err(e) => {
+            return Err(if e.kind() == std::io::ErrorKind::NotFound {
+                ChrootError::CommandNotFound(command[0].to_string(), e)
+            } else {
+                ChrootError::CommandFailed(command[0].to_string(), e)
+            }
+            .into())
+        }
     };
 
     let code = if pstatus.success() {

src/uu/chroot/src/error.rs

@@ -18,6 +18,9 @@ pub enum ChrootError {
     /// Failed to execute the specified command.
     CommandFailed(String, Error),
 
+    /// Failed to find the specified command.
+    CommandNotFound(String, Error),
+
     /// The given user and group specification was invalid.
     InvalidUserspec(String),
 
@@ -43,12 +46,15 @@ pub enum ChrootError {
 impl std::error::Error for ChrootError {}
 
 impl UError for ChrootError {
-    // TODO: Exit status:
     // 125 if chroot itself fails
     // 126 if command is found but cannot be invoked
     // 127 if command cannot be found
     fn code(&self) -> i32 {
-        1
+        match self {
+            Self::CommandFailed(_, _) => 126,
+            Self::CommandNotFound(_, _) => 127,
+            _ => 125,
+        }
     }
 }
 
@@ -56,7 +62,7 @@ impl Display for ChrootError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         match self {
             Self::CannotEnter(s, e) => write!(f, "cannot chroot to {}: {}", s.quote(), e,),
-            Self::CommandFailed(s, e) => {
+            Self::CommandFailed(s, e) | Self::CommandNotFound(s, e) => {
                 write!(f, "failed to run command {}: {}", s.to_string().quote(), e,)
             }
             Self::InvalidUserspec(s) => write!(f, "invalid userspec: {}", s.quote(),),

tests/by-util/test_chroot.rs

@@ -9,7 +9,9 @@ fn test_invalid_arg() {
 
 #[test]
 fn test_missing_operand() {
-    let result = new_ucmd!().run();
+    let result = new_ucmd!().fails();
+
+    result.code_is(125);
 
     assert!(result
         .stderr_str()
@@ -27,7 +29,7 @@ fn test_enter_chroot_fails() {
     at.mkdir("jail");
 
     let result = ucmd.arg("jail").fails();
-
+    result.code_is(125);
     assert!(result
         .stderr_str()
         .starts_with("chroot: cannot chroot to 'jail': Operation not permitted (os error 1)"));
@@ -41,7 +43,8 @@ fn test_no_such_directory() {
 
     ucmd.arg("a")
         .fails()
-        .stderr_is("chroot: cannot change root directory to 'a': no such directory");
+        .stderr_is("chroot: cannot change root directory to 'a': no such directory")
+        .code_is(125);
 }
 
 #[test]
@@ -51,7 +54,7 @@ fn test_invalid_user_spec() {
     at.mkdir("a");
 
     let result = ucmd.arg("a").arg("--userspec=ARABA:").fails();
-
+    result.code_is(125);
     assert!(result.stderr_str().starts_with("chroot: invalid userspec"));
 }
 
@@ -91,7 +94,9 @@ fn test_preference_of_userspec() {
         .arg("-G")
         .arg("ABC,DEF")
         .arg(format!("--userspec={}:{}", username, group_name))
-        .run();
+        .fails();
+
+    result.code_is(125);
 
     println!("result.stdout = {}", result.stdout_str());
     println!("result.stderr = {}", result.stderr_str());