add a --version that includes commit hash to mum{ctl,d}

1 files changed, 25 insertions, 0 deletions

diff --git a/mumctl/build.rs b/mumctl/build.rs
new file mode 100644
index 0000000..45cfd4e
--- /dev/null
+++ b/mumctl/build.rs
@@ -0,0 +1,25 @@
+use std::process::Command;
+
+fn main() {
+    let version = format!(
+        "{} {}-{}",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+        commit_hash(),
+    );
+
+    println!("cargo:rustc-env=VERSION={}", version);
+}
+
+fn commit_hash() -> String {
+    let output = Command::new("git")
+                         .arg("show")
+                         .arg("--pretty=format:%h")  // abbrev hash
+                         .current_dir(env!("CARGO_MANIFEST_DIR"))
+                         .output();
+    if let Ok(output) = output {
+        String::from_utf8_lossy(&output.stdout).to_string()
+    } else {
+        String::from("???")
+    }
+}