enable utmpx feature for musl

.github/workflows/CICD.yml

@@ -516,13 +516,13 @@ jobs:
           # - { os , target , cargo-options , features , use-cross , toolchain, skip-tests, workspace-tests }
           - { os: ubuntu-latest  , target: arm-unknown-linux-gnueabihf , features: feat_os_unix_gnueabihf , use-cross: use-cross , skip-tests: true }
           - { os: ubuntu-24.04-arm  , target: aarch64-unknown-linux-gnu   , features: feat_os_unix_gnueabihf }
-          - { os: ubuntu-latest  , target: aarch64-unknown-linux-musl  , features: feat_os_unix_musl      , use-cross: use-cross , skip-tests: true }
+          - { os: ubuntu-latest  , target: aarch64-unknown-linux-musl  , features: feat_os_unix      , use-cross: use-cross , skip-tests: true }
           # - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: feat_selinux           , use-cross: use-cross }
           - { os: ubuntu-latest  , target: i686-unknown-linux-gnu      , features: "feat_os_unix,test_risky_names", use-cross: use-cross }
-          - { os: ubuntu-latest  , target: i686-unknown-linux-musl     , features: feat_os_unix_musl      , use-cross: use-cross }
+          - { os: ubuntu-latest  , target: i686-unknown-linux-musl     , features: feat_os_unix      , use-cross: use-cross }
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: "feat_os_unix,test_risky_names", use-cross: use-cross }
           - { os: ubuntu-latest  , target: x86_64-unknown-linux-gnu    , features: "feat_os_unix,uudoc"   , use-cross: no, workspace-tests: true }
-          - { os: ubuntu-latest  , target: x86_64-unknown-linux-musl   , features: feat_os_unix_musl      , use-cross: use-cross }
+          - { os: ubuntu-latest  , target: x86_64-unknown-linux-musl   , features: feat_os_unix      , use-cross: use-cross }
           - { os: ubuntu-latest  , target: x86_64-unknown-redox        , features: feat_os_unix_redox     , use-cross: redoxer , skip-tests: true }
           - { os: macos-latest   , target: aarch64-apple-darwin        , features: feat_os_macos, workspace-tests: true } # M1 CPU
           - { os: macos-13       , target: x86_64-apple-darwin         , features: feat_os_macos, workspace-tests: true }

Cargo.toml

@@ -149,7 +149,8 @@ feat_os_macos = [
   #
   "feat_require_unix_hostid",
 ]
-# "feat_os_unix" == set of utilities which can be built/run on modern/usual *nix platforms
+# "feat_os_unix" == set of utilities which can be built/run on modern/usual *nix platforms.
+# Also used for targets binding to the "musl" library (ref: <https://musl.libc.org/about.html>)
 feat_os_unix = [
   "feat_Tier1",
   #
@@ -171,14 +172,6 @@ feat_os_unix_gnueabihf = [
   "feat_require_unix_hostid",
   "feat_require_unix_utmpx",
 ]
-# "feat_os_unix_musl" == set of utilities which can be built/run on targets binding to the "musl" library (ref: <https://musl.libc.org/about.html>)
-feat_os_unix_musl = [
-  "feat_Tier1",
-  #
-  "feat_require_crate_cpp",
-  "feat_require_unix",
-  "feat_require_unix_hostid",
-]
 feat_os_unix_android = [
   "feat_Tier1",
   #
@@ -308,7 +301,7 @@ hostname = "0.4"
 iana-time-zone = "0.1.57"
 indicatif = "0.17.8"
 itertools = "0.14.0"
-libc = "0.2.153"
+libc = "0.2.172"
 linux-raw-sys = "0.9"
 lscolors = { version = "0.20.0", default-features = false, features = [
   "gnu_legacy",

src/uu/pinky/src/pinky.rs

@@ -10,7 +10,18 @@ use uucore::{format_usage, help_about, help_usage};
 
 mod platform;
 
+#[cfg(target_env = "musl")]
+const ABOUT: &str = concat!(
+    help_about!("pinky.md"),
+    "\n\nWarning: When built with musl libc, the `pinky` utility may show incomplete \n",
+    "or missing user information due to musl's stub implementation of `utmpx` \n",
+    "functions. This limitation affects the ability to retrieve accurate details \n",
+    "about logged-in users."
+);
+
+#[cfg(not(target_env = "musl"))]
 const ABOUT: &str = help_about!("pinky.md");
+
 const USAGE: &str = help_usage!("pinky.md");
 
 mod options {

src/uu/uptime/src/uptime.rs

@@ -23,7 +23,17 @@ use uucore::{format_usage, help_about, help_usage};
 #[cfg(not(target_os = "openbsd"))]
 use uucore::utmpx::*;
 
+#[cfg(target_env = "musl")]
+const ABOUT: &str = concat!(
+    help_about!("uptime.md"),
+    "\n\nWarning: When built with musl libc, the `uptime` utility may show '0 users' \n",
+    "due to musl's stub implementation of utmpx functions. Boot time and load averages \n",
+    "are still calculated using alternative mechanisms."
+);
+
+#[cfg(not(target_env = "musl"))]
 const ABOUT: &str = help_about!("uptime.md");
+
 const USAGE: &str = help_usage!("uptime.md");
 pub mod options {
     pub static SINCE: &str = "since";

src/uu/users/src/users.rs

@@ -18,7 +18,16 @@ use utmp_classic::{UtmpEntry, parse_from_path};
 #[cfg(not(target_os = "openbsd"))]
 use uucore::utmpx::{self, Utmpx};
 
+#[cfg(target_env = "musl")]
+const ABOUT: &str = concat!(
+    help_about!("users.md"),
+    "\n\nWarning: When built with musl libc, the `users` utility may show '0 users' \n",
+    "due to musl's stub implementation of utmpx functions."
+);
+
+#[cfg(not(target_env = "musl"))]
 const ABOUT: &str = help_about!("users.md");
+
 const USAGE: &str = help_usage!("users.md");
 
 #[cfg(target_os = "openbsd")]

src/uu/who/src/who.rs

@@ -28,7 +28,17 @@ mod options {
     pub const FILE: &str = "FILE"; // if length=1: FILE, if length=2: ARG1 ARG2
 }
 
+#[cfg(target_env = "musl")]
+const ABOUT: &str = concat!(
+    help_about!("who.md"),
+    "\n\nNote: When built with musl libc, the `who` utility will not display any \n",
+    "information about logged-in users. This is due to musl's stub implementation \n",
+    "of `utmpx` functions, which prevents access to the necessary data."
+);
+
+#[cfg(not(target_env = "musl"))]
 const ABOUT: &str = help_about!("who.md");
+
 const USAGE: &str = help_usage!("who.md");
 
 #[cfg(target_os = "linux")]

src/uucore/src/lib/features.rs

@@ -76,7 +76,6 @@ pub mod signals;
     not(target_os = "fuchsia"),
     not(target_os = "openbsd"),
     not(target_os = "redox"),
-    not(target_env = "musl"),
     feature = "utmpx"
 ))]
 pub mod utmpx;

src/uucore/src/lib/lib.rs

@@ -89,7 +89,6 @@ pub use crate::features::signals;
     not(target_os = "fuchsia"),
     not(target_os = "openbsd"),
     not(target_os = "redox"),
-    not(target_env = "musl"),
     feature = "utmpx"
 ))]
 pub use crate::features::utmpx;

tests/by-util/test_uptime.rs

@@ -103,6 +103,7 @@ fn test_uptime_with_non_existent_file() {
 // This will pass
 #[test]
 #[cfg(not(any(target_os = "openbsd", target_os = "macos")))]
+#[cfg(not(target_env = "musl"))]
 #[cfg_attr(
     all(target_arch = "aarch64", target_os = "linux"),
     ignore = "Issue #7159 - Test not supported on ARM64 Linux"