stat: add support for selinux

Author: sylvestre

Cargo.toml

@@ -51,6 +51,7 @@ feat_selinux = [
   "id/selinux",
   "ls/selinux",
   "mkdir/selinux",
+  "stat/selinux",
   "selinux",
   "feat_require_selinux",
 ]

src/uu/stat/Cargo.toml

@@ -22,6 +22,9 @@ clap = { workspace = true }
 uucore = { workspace = true, features = ["entries", "libc", "fs", "fsext"] }
 chrono = { workspace = true }
 
+[features]
+selinux = ["uucore/selinux"]
+
 [[bin]]
 name = "stat"
 path = "src/main.rs"

src/uu/stat/src/stat.rs

@@ -902,7 +902,27 @@ impl Stater {
                     // FIXME: blocksize differs on various platform
                     // See coreutils/gnulib/lib/stat-size.h ST_NBLOCKSIZE // spell-checker:disable-line
                     'B' => OutputType::Unsigned(512),
-
+                    // SELinux security context string
+                    'C' => {
+                        #[cfg(feature = "selinux")]
+                        {
+                            if uucore::selinux::check_selinux_enabled().is_ok() {
+                                match uucore::selinux::get_selinux_security_context(Path::new(file))
+                                {
+                                    Ok(ctx) => OutputType::Str(ctx),
+                                    Err(_) => OutputType::Str(
+                                        "failed to get security context".to_string(),
+                                    ),
+                                }
+                            } else {
+                                OutputType::Str("unsupported on this system".to_string())
+                            }
+                        }
+                        #[cfg(not(feature = "selinux"))]
+                        {
+                            OutputType::Str("unsupported for this operating system".to_string())
+                        }
+                    }
                     // device number in decimal
                     'd' => OutputType::Unsigned(meta.dev()),
                     // device number in hex

tests/by-util/test_stat.rs

@@ -490,3 +490,27 @@ fn test_printf_invalid_directive() {
         .fails_with_code(1)
         .stderr_contains("'%9%': invalid directive");
 }
+
+#[test]
+#[cfg(feature = "feat_selinux")]
+fn test_stat_selinux() {
+    let ts = TestScenario::new(util_name!());
+    let at = &ts.fixtures;
+    at.touch("f");
+    ts.ucmd()
+        .arg("--printf='%C'")
+        .arg("f")
+        .succeeds()
+        .no_stderr()
+        .stdout_contains("unconfined_u");
+    ts.ucmd()
+        .arg("--printf='%C'")
+        .arg("/bin/")
+        .succeeds()
+        .no_stderr()
+        .stdout_contains("system_u");
+    // Count that we have 4 fields
+    let result = ts.ucmd().arg("--printf='%C'").arg("/bin/").succeeds();
+    let s: Vec<_> = result.stdout_str().split(":").collect();
+    assert!(s.len() == 4);
+}