Add `hostid` applet

README.md

@@ -34,6 +34,7 @@ code between applets, making for an overall smaller binary.
 - fold
 - groups
 - head
+- hostid
 - hostname
 - link
 - logname

src/cmd/hostid/mod.rs

@@ -0,0 +1,27 @@
+use super::Cmd;
+use clap::Command;
+
+#[derive(Debug, Default)]
+pub struct Hostid;
+
+impl Cmd for Hostid {
+    fn cli(&self) -> clap::Command {
+        Command::new("hostid")
+            .about("print the numeric identifier for the current host")
+            .author("Nathan Fisher")
+            .version(env!("CARGO_PKG_VERSION"))
+    }
+
+    fn run(&self, _matches: Option<&clap::ArgMatches>) -> Result<(), Box<dyn std::error::Error>> {
+        let hostid = unsafe {
+            libc::gethostid()
+        };
+        let hostid: String = format!("{hostid:x}").chars().skip(8).collect();
+        println!("{}", hostid);
+        Ok(())
+    }
+
+    fn path(&self) -> Option<crate::Path> {
+        Some(crate::Path::UsrBin)
+    }
+}

src/cmd/mod.rs

@@ -22,6 +22,7 @@ mod fold;
 mod getty;
 mod groups;
 mod head;
+mod hostid;
 mod hostname;
 mod link;
 mod ln;
@@ -86,6 +87,8 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
         "fold" => Some(Box::new(fold::Fold::default())),
         "groups" => Some(Box::new(groups::Groups::default())),
         "head" => Some(Box::new(head::Head::default())),
+        "hostid" => Some(Box::new(hostid::Hostid::default())),
+        "hostname" => Some(Box::new(hostname::Hostname::default())),
         "link" => Some(Box::new(link::Link::default())),
         "logname" => Some(Box::new(logname::Logname::default())),
         "mkfifo" => Some(Box::new(mkfifo::MkFifo::default())),
@@ -113,7 +116,7 @@ pub fn get(name: &str) -> Option<Box<dyn Cmd>> {
     }
 }
 
-pub static COMMANDS: [&str; 41] = [
+pub static COMMANDS: [&str; 42] = [
     "base32",
     "base64",
     "basename",
@@ -131,6 +134,7 @@ pub static COMMANDS: [&str; 41] = [
     "fold",
     "groups",
     "head",
+    "hostid",
     "hostname",
     "link",
     "logname",