ksud: make it buildable without git installed

userspace/ksud/build.rs

@@ -4,34 +4,43 @@ use std::io::Write;
 use std::path::Path;
 use std::process::Command;
 
-fn get_git_version() -> (u32, String) {
+fn get_git_version() -> Result<(u32, String), std::io::Error> {
-    let version_code = String::from_utf8(
+    let output = Command::new("git")
-        Command::new("git")
         .args(["rev-list", "--count", "HEAD"])
-            .output()
+        .output()?;
-            .expect("Failed to get git count")
+
-            .stdout,
+    let output = output.stdout;
-    )
+    let version_code = String::from_utf8(output).expect("Failed to read git count stdout");
-    .expect("Failed to read git count stdout");
     let version_code: u32 = version_code
         .trim()
         .parse()
-        .expect("Failed to parse git count");
+        .map_err(|_| std::io::Error::new(std::io::ErrorKind::Other, "Failed to parse git count"))?;
     let version_code = 10000 + 200 + version_code; // For historical reasons
 
     let version_name = String::from_utf8(
         Command::new("git")
             .args(["describe", "--tags", "--always"])
-            .output()
+            .output()?
-            .expect("Failed to get git version")
             .stdout,
     )
-    .expect("Failed to read git version stdout");
+    .map_err(|_| {
-    (version_code, version_name)
+        std::io::Error::new(
+            std::io::ErrorKind::Other,
+            "Failed to read git describe stdout",
+        )
+    })?;
+    Ok((version_code, version_name))
 }
 
 fn main() {
-    let (code, name) = get_git_version();
+    let (code, name) = match get_git_version() {
+        Ok((code, name)) => (code, name),
+        Err(_) => {
+            // show warning if git is not installed
+            println!("cargo:warning=Failed to get git version, using 0.0.0");
+            (0, "0.0.0".to_string())
+        }
+    };
     let out_dir = env::var("OUT_DIR").expect("Failed to get $OUT_DIR");
     let out_dir = Path::new(&out_dir);
     File::create(Path::new(out_dir).join("VERSION_CODE"))