install: add test for install owner flag with invalid uid

Author: zhw2101024

Cargo.lock

@@ -527,6 +527,7 @@ procfs = { version = "0.17", default-features = false }
 nix = { workspace = true, features = ["process", "signal", "user", "term"] }
 rlimit = "0.10.1"
 xattr = { workspace = true }
+subprocess = "0.2.9"
 
 # Specifically used in test_uptime::test_uptime_with_file_containing_valid_boot_time_utmpx_record
 # to deserialize a utmpx struct into a binary file

Cargo.toml

@@ -12,6 +12,8 @@ use std::os::unix::fs::{MetadataExt, PermissionsExt};
 use std::process::Command;
 #[cfg(any(target_os = "linux", target_os = "android"))]
 use std::thread::sleep;
+#[cfg(not(windows))]
+use subprocess::Exec;
 use uucore::process::{getegid, geteuid};
 use uutests::at_and_ucmd;
 use uutests::new_ucmd;
@@ -1808,3 +1810,37 @@ fn test_install_symlink_same_file() {
             "'{target_dir}/{file}' and '{target_link}/{file}' are the same file"
         ));
 }
+
+#[test]
+#[cfg(target_os = "linux")]
+fn test_install_set_owner_nonexistent_userid() {
+    let captured = Exec::shell(
+        "cat /etc/passwd|cut -d ':' -f 3|grep '^1...$'|sort -n|tail -n 1|awk '{print $1+1}'",
+    )
+    .capture();
+    let next_userid = match captured {
+        Ok(output) => {
+            let userid_str = output.stdout_str().trim_end().to_owned();
+            match userid_str.parse::<u32>() {
+                Ok(userid) => userid,
+                Err(e) => panic!("cannot convert {} to userid, {}", userid_str, e),
+            }
+        }
+        Err(e) => panic!("cannot capture output: {}", e),
+    };
+
+    let ts = TestScenario::new(util_name!());
+    let at = &ts.fixtures;
+    at.touch("a");
+    at.touch("c");
+
+    if let Ok(result) = run_ucmd_as_root(&ts, &[format!("-o{}", next_userid).as_str(), "a", "b"]) {
+        result.success();
+        assert!(at.file_exists("b"));
+
+        let metadata = fs::metadata(at.plus("b")).unwrap();
+        assert_eq!(metadata.uid(), next_userid);
+    } else {
+        print!("Test skipped; requires root user");
+    }
+}