From 172be3a8c62e77f50d86065a26b32e2f999f63d2 Mon Sep 17 00:00:00 2001
From: ndd7xv <nathan.do@alumni.virginia.edu>
Date: Wed, 23 Feb 2022 22:34:34 -0500
Subject: [PATCH 1/2] install: better error messages when invalid arguments

executing `install` or `install file` no longer panics and insteads returns errors similar to GNU's install when it encounters similar args
---
 src/uu/install/src/install.rs | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/uu/install/src/install.rs b/src/uu/install/src/install.rs
index 5a106d8fc..9b72627fa 100644
--- a/src/uu/install/src/install.rs
+++ b/src/uu/install/src/install.rs
@@ -18,7 +18,7 @@ use filetime::{set_file_times, FileTime};
 use uucore::backup_control::{self, BackupMode};
 use uucore::display::Quotable;
 use uucore::entries::{grp2gid, usr2uid};
-use uucore::error::{FromIo, UError, UIoError, UResult};
+use uucore::error::{FromIo, UError, UIoError, UResult, UUsageError};
 use uucore::format_usage;
 use uucore::mode::get_umask;
 use uucore::perms::{wrap_chown, Verbosity, VerbosityLevel};
@@ -442,11 +442,14 @@ fn is_new_file_path(path: &Path) -> bool {
 /// Returns a Result type with the Err variant containing the error message.
 ///
 fn standard(mut paths: Vec<String>, b: &Behavior) -> UResult<()> {
-    let target: PathBuf = b
-        .target_dir
-        .clone()
-        .unwrap_or_else(|| paths.pop().unwrap())
-        .into();
+    let target: PathBuf = if let Some(path) = &b.target_dir {
+        path.into()
+    } else {
+        paths
+            .pop()
+            .ok_or_else(|| UUsageError::new(1, "missing file operand"))?
+            .into()
+    };
 
     let sources = &paths.iter().map(PathBuf::from).collect::<Vec<_>>();
 
@@ -468,7 +471,19 @@ fn standard(mut paths: Vec<String>, b: &Behavior) -> UResult<()> {
         }
 
         if target.is_file() || is_new_file_path(&target) {
-            copy(&sources[0], &target, b)
+            copy(
+                sources.get(0).ok_or_else(|| {
+                    UUsageError::new(
+                        1,
+                        format!(
+                            "missing destination file operand after '{}'",
+                            target.to_str().unwrap()
+                        ),
+                    )
+                })?,
+                &target,
+                b,
+            )
         } else {
             Err(InstallError::InvalidTarget(target).into())
         }

From 47be40afaeaa4176c237a1863311b54f55b74d1d Mon Sep 17 00:00:00 2001
From: ndd7xv <nathan.do@alumni.virginia.edu>
Date: Fri, 25 Feb 2022 21:17:43 -0500
Subject: [PATCH 2/2] install: add tests for error handling

---
 tests/by-util/test_install.rs | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tests/by-util/test_install.rs b/tests/by-util/test_install.rs
index 23bebf224..3d78331f9 100644
--- a/tests/by-util/test_install.rs
+++ b/tests/by-util/test_install.rs
@@ -1100,3 +1100,27 @@ fn test_install_backup_off() {
     assert!(at.file_exists(file_b));
     assert!(!at.file_exists(&format!("{}~", file_b)));
 }
+
+#[test]
+fn test_install_missing_arguments() {
+    let scene = TestScenario::new(util_name!());
+
+    scene
+        .ucmd()
+        .fails()
+        .stderr_contains("install: missing file operand");
+}
+
+#[test]
+fn test_install_missing_destination() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+
+    let file_1 = "source_file1";
+
+    at.touch(file_1);
+    scene.ucmd().arg(file_1).fails().stderr_contains(format!(
+        "install: missing destination file operand after '{}'",
+        file_1
+    ));
+}