Tests: provides easy mount of temp fs (#7249)

tests/by-util/test_base64.rs

@@ -232,7 +232,7 @@ fn test_manpage() {
 
     let test_scenario = TestScenario::new("");
 
-    let child = Command::new(test_scenario.bin_path)
+    let child = Command::new(&test_scenario.bin_path)
         .arg("manpage")
         .arg("base64")
         .stdin(Stdio::piped())

tests/by-util/test_cp.rs

@@ -2288,7 +2288,7 @@ fn test_cp_one_file_system() {
     use crate::common::util::AtPath;
     use walkdir::WalkDir;
 
-    let scene = TestScenario::new(util_name!());
+    let mut scene = TestScenario::new(util_name!());
     let at = &scene.fixtures;
 
     // Test must be run as root (or with `sudo -E`)
@@ -2304,14 +2304,8 @@ fn test_cp_one_file_system() {
     let mountpoint_path = &at_src.plus_as_string(TEST_MOUNT_MOUNTPOINT);
 
     scene
-        .cmd("mount")
+        .mount_temp_fs(mountpoint_path)
-        .arg("-t")
+        .expect("mounting tmpfs failed");
-        .arg("tmpfs")
-        .arg("-o")
-        .arg("size=640k") // ought to be enough
-        .arg("tmpfs")
-        .arg(mountpoint_path)
-        .succeeds();
 
     at_src.touch(TEST_MOUNT_OTHER_FILESYSTEM_FILE);
 
@@ -2324,7 +2318,7 @@ fn test_cp_one_file_system() {
         .succeeds();
 
     // Ditch the mount before the asserts
-    scene.cmd("umount").arg(mountpoint_path).succeeds();
+    scene.umount_temp_fs();
 
     assert!(!at_dst.file_exists(TEST_MOUNT_OTHER_FILESYSTEM_FILE));
     // Check if the other files were copied from the source folder hierarchy

tests/by-util/test_dd.rs

@@ -1683,7 +1683,7 @@ fn test_reading_partial_blocks_from_fifo() {
 fn test_reading_partial_blocks_from_fifo_unbuffered() {
     // Create the FIFO.
     let ts = TestScenario::new(util_name!());
-    let at = ts.fixtures;
+    let at = &ts.fixtures;
     at.mkfifo("fifo");
     let fifoname = at.plus_as_string("fifo");
 

tests/by-util/test_du.rs

@@ -655,7 +655,7 @@ fn test_du_time() {
 #[cfg(feature = "touch")]
 fn birth_supported() -> bool {
     let ts = TestScenario::new(util_name!());
-    let m = match std::fs::metadata(ts.fixtures.subdir) {
+    let m = match std::fs::metadata(&ts.fixtures.subdir) {
         Ok(m) => m,
         Err(e) => panic!("{}", e),
     };

tests/by-util/test_env.rs

@@ -137,7 +137,7 @@ fn test_debug_2() {
     let result = ts
         .ucmd()
         .arg("-vv")
-        .arg(ts.bin_path)
+        .arg(&ts.bin_path)
         .args(&["echo", "hello2"])
         .succeeds();
     result.stderr_matches(
@@ -165,7 +165,7 @@ fn test_debug1_part_of_string_arg() {
     let result = ts
         .ucmd()
         .arg("-vS FOO=BAR")
-        .arg(ts.bin_path)
+        .arg(&ts.bin_path)
         .args(&["echo", "hello1"])
         .succeeds();
     result.stderr_matches(
@@ -186,7 +186,7 @@ fn test_debug2_part_of_string_arg() {
     let result = ts
         .ucmd()
         .arg("-vvS FOO=BAR")
-        .arg(ts.bin_path)
+        .arg(&ts.bin_path)
         .args(&["echo", "hello2"])
         .succeeds();
     result.stderr_matches(

tests/by-util/test_pwd.rs

@@ -31,7 +31,7 @@ fn test_deleted_dir() {
     use std::process::Command;
 
     let ts = TestScenario::new(util_name!());
-    let at = ts.fixtures;
+    let at = &ts.fixtures;
     let output = Command::new("sh")
         .arg("-c")
         .arg(format!(

tests/common/util.rs

@@ -4,7 +4,7 @@
 // file that was distributed with this source code.
 
 //spell-checker: ignore (linux) rlimit prlimit coreutil ggroups uchild uncaptured scmd SHLVL canonicalized openpty
-//spell-checker: ignore (linux) winsize xpixel ypixel setrlimit FSIZE SIGBUS SIGSEGV sigbus
+//spell-checker: ignore (linux) winsize xpixel ypixel setrlimit FSIZE SIGBUS SIGSEGV sigbus tmpfs
 
 #![allow(dead_code)]
 #![allow(
@@ -1169,6 +1169,8 @@ pub struct TestScenario {
     pub util_name: String,
     pub fixtures: AtPath,
     tmpd: Rc<TempDir>,
+    #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+    tmp_fs_mountpoint: Option<String>,
 }
 
 impl TestScenario {
@@ -1182,6 +1184,8 @@ impl TestScenario {
             util_name: util_name.as_ref().into(),
             fixtures: AtPath::new(tmpd.as_ref().path()),
             tmpd,
+            #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+            tmp_fs_mountpoint: None,
         };
         let mut fixture_path_builder = env::current_dir().unwrap();
         fixture_path_builder.push(TESTS_DIR);
@@ -1215,6 +1219,44 @@ impl TestScenario {
     pub fn ccmd<S: AsRef<str>>(&self, util_name: S) -> UCommand {
         UCommand::with_util(util_name, self.tmpd.clone())
     }
+
+    /// Mounts a temporary filesystem at the specified mount point.
+    #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+    pub fn mount_temp_fs(&mut self, mount_point: &str) -> core::result::Result<(), String> {
+        if self.tmp_fs_mountpoint.is_some() {
+            return Err("already mounted".to_string());
+        }
+        let cmd_result = self
+            .cmd("mount")
+            .arg("-t")
+            .arg("tmpfs")
+            .arg("-o")
+            .arg("size=640k") // ought to be enough
+            .arg("tmpfs")
+            .arg(mount_point)
+            .run();
+        if !cmd_result.succeeded() {
+            return Err(format!("mount failed: {}", cmd_result.stderr_str()));
+        }
+        self.tmp_fs_mountpoint = Some(mount_point.to_string());
+        Ok(())
+    }
+
+    #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+    /// Unmounts the temporary filesystem if it is currently mounted.
+    pub fn umount_temp_fs(&mut self) {
+        if let Some(mount_point) = self.tmp_fs_mountpoint.as_ref() {
+            self.cmd("umount").arg(mount_point).succeeds();
+            self.tmp_fs_mountpoint = None;
+        }
+    }
+}
+
+impl Drop for TestScenario {
+    fn drop(&mut self) {
+        #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+        self.umount_temp_fs();
+    }
 }
 
 #[cfg(unix)]
@@ -4007,4 +4049,24 @@ mod tests {
             .stdout_is(expected);
         std::assert_eq!(p_umask, get_umask()); // make sure parent umask didn't change
     }
+
+    #[cfg(any(target_os = "linux", target_os = "android", target_os = "freebsd"))]
+    #[test]
+    fn test_mount_temp_fs() {
+        let mut scene = TestScenario::new("util");
+        let at = &scene.fixtures;
+        // Test must be run as root (or with `sudo -E`)
+        if scene.cmd("whoami").run().stdout_str() != "root\n" {
+            return;
+        }
+        at.mkdir("mountpoint");
+        let mountpoint = at.plus("mountpoint");
+        scene.mount_temp_fs(mountpoint.to_str().unwrap()).unwrap();
+        scene
+            .cmd("df")
+            .arg("-h")
+            .arg(mountpoint)
+            .succeeds()
+            .stdout_contains("tmpfs");
+    }
 }

tests/test_util_name.rs

@@ -35,7 +35,7 @@ fn execution_phrase_single() {
     use std::process::Command;
 
     let scenario = TestScenario::new("ls");
-    symlink_file(scenario.bin_path, scenario.fixtures.plus("uu-ls")).unwrap();
+    symlink_file(&scenario.bin_path, scenario.fixtures.plus("uu-ls")).unwrap();
     let output = Command::new(scenario.fixtures.plus("uu-ls"))
         .arg("--some-invalid-arg")
         .output()
@@ -56,7 +56,7 @@ fn util_name_double() {
     };
 
     let scenario = TestScenario::new("sort");
-    let mut child = Command::new(scenario.bin_path)
+    let mut child = Command::new(&scenario.bin_path)
         .arg("sort")
         .stdin(Stdio::piped())
         .stderr(Stdio::piped())
@@ -78,7 +78,7 @@ fn util_name_single() {
     };
 
     let scenario = TestScenario::new("sort");
-    symlink_file(scenario.bin_path, scenario.fixtures.plus("uu-sort")).unwrap();
+    symlink_file(&scenario.bin_path, scenario.fixtures.plus("uu-sort")).unwrap();
     let mut child = Command::new(scenario.fixtures.plus("uu-sort"))
         .stdin(Stdio::piped())
         .stderr(Stdio::piped())
@@ -102,7 +102,7 @@ fn util_invalid_name_help() {
     };
 
     let scenario = TestScenario::new("invalid_name");
-    symlink_file(scenario.bin_path, scenario.fixtures.plus("invalid_name")).unwrap();
+    symlink_file(&scenario.bin_path, scenario.fixtures.plus("invalid_name")).unwrap();
     let child = Command::new(scenario.fixtures.plus("invalid_name"))
         .arg("--help")
         .stdin(Stdio::piped())
@@ -138,7 +138,7 @@ fn util_non_utf8_name_help() {
 
     let scenario = TestScenario::new("invalid_name");
     let non_utf8_path = scenario.fixtures.plus(OsStr::from_bytes(b"\xff"));
-    symlink_file(scenario.bin_path, &non_utf8_path).unwrap();
+    symlink_file(&scenario.bin_path, &non_utf8_path).unwrap();
     let child = Command::new(&non_utf8_path)
         .arg("--help")
         .stdin(Stdio::piped())
@@ -166,7 +166,7 @@ fn util_invalid_name_invalid_command() {
     };
 
     let scenario = TestScenario::new("invalid_name");
-    symlink_file(scenario.bin_path, scenario.fixtures.plus("invalid_name")).unwrap();
+    symlink_file(&scenario.bin_path, scenario.fixtures.plus("invalid_name")).unwrap();
     let child = Command::new(scenario.fixtures.plus("invalid_name"))
         .arg("definitely_invalid")
         .stdin(Stdio::piped())
@@ -192,7 +192,7 @@ fn util_completion() {
     };
 
     let scenario = TestScenario::new("completion");
-    let child = Command::new(scenario.bin_path)
+    let child = Command::new(&scenario.bin_path)
         .arg("completion")
         .arg("true")
         .arg("powershell")
@@ -220,7 +220,7 @@ fn util_manpage() {
     };
 
     let scenario = TestScenario::new("completion");
-    let child = Command::new(scenario.bin_path)
+    let child = Command::new(&scenario.bin_path)
         .arg("manpage")
         .arg("true")
         .stdin(Stdio::piped())