Fail gracefully if `git` does not exist

1 files changed, 8 insertions, 6 deletions

diff --git a/cli/build.rs b/cli/build.rs
index f7b70e7f..afaed657 100644
--- a/cli/build.rs
+++ b/cli/build.rs
@@ -1,9 +1,11 @@
-use std::error::Error;
 use std::process::Command;
 
-fn main() -> Result<(), Box<dyn Error>> {
-    let output = Command::new("git").args(&["rev-parse", "HEAD"]).output()?;
-    let hash = std::str::from_utf8(&output.stdout)?;
-    println!("cargo:rustc-env=TYPST_HASH={}", &hash[..8]);
-    Ok(())
+fn main() {
+    let version = Command::new("git")
+        .args(&["rev-parse", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|output| String::from_utf8(output.stdout[..8].into()).ok())
+        .unwrap_or_else(|| "(unknown version)".into());
+    println!("cargo:rustc-env=TYPST_VERSION={version}");
 }