#163 Handle git dependency in build.rs (#175)

* #163 Handle git dependency in build.rs

* warning litteral

* println

Co-authored-by: jacek-casper <[email protected]>

---------

Co-authored-by: jacek-casper <[email protected]>

build.rs

@@ -1,21 +1,35 @@
+use std::io;
 use std::process::Command;
 
 const GIT_HASH_ENV_VAR: &str = "GIT_SHA_SHORT";
 
 fn main() {
-    //Build command to retrieve the short git commit hash
-    let git_process_output = Command::new("git")
+    match get_git_commit_hash() {
+        // If the git commit hash is retrieved successfully, set the environment variable
+        Ok(git_hash) => {
+            println!("cargo:rustc-env={GIT_HASH_ENV_VAR}={git_hash}");
+        }
+        // If there's an error retrieving the git commit hash, print a note and set the environment variable to "unknown"
+        Err(e) => {
+            println!("cargo:warning=Note: Failed to get git commit hash: {}", e);
+            println!("cargo:rustc-env={GIT_HASH_ENV_VAR}=unknown");
+        }
+    }
+}
+
+fn get_git_commit_hash() -> Result<String, io::Error> {
+    // Build the command to retrieve the short git commit hash
+    let output = Command::new("git")
         .arg("rev-parse")
         .arg("--short")
         .arg("HEAD")
-        .output()
-        .expect("Failed to retrieve short git commit hash");
-
-    //Parse the raw output into a string, we still need to remove the newline character
-    let git_hash_raw =
-        String::from_utf8(git_process_output.stdout).expect("Failed to convert git hash to string");
-    //Remove the newline character from the short git commit hash
-    let git_hash = git_hash_raw.trim_end_matches('\n');
+        .output()?;
 
-    println!("cargo:rustc-env={}={}", GIT_HASH_ENV_VAR, git_hash);
+    if output.status.success() {
+        // Parse the raw output into a string and trim the newline character
+        Ok(String::from_utf8_lossy(&output.stdout).trim().to_string())
+    } else {
+        // Return an error if the command failed
+        Err(io::Error::new(io::ErrorKind::Other, "Git command failed"))
+    }
 }