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build.rs

@@ -6,6 +6,10 @@ fn main() {
 
 fn run(args: &[&str]) -> Result<String, std::io::Error> {
     let out = Command::new(args[0]).args(&args[1..]).output()?;
+    if !out.status.success() {
+        use std::io::{Error, ErrorKind};
+        return Err(Error::new(ErrorKind::Other, "Command not successful"));
+    }
     Ok(String::from_utf8(out.stdout).unwrap().trim().to_string())
 }
 
@@ -13,8 +17,10 @@ fn run(args: &[&str]) -> Result<String, std::io::Error> {
 fn read_git_info() -> Result<(), std::io::Error> {
     // The exact tag for the current commit, can be empty when
     // the current commit doesn't have an associated tag
-    let exact_tag = run(&["git", "describe", "--abbrev=0", "--tags", "--exact-match"])?;
-    println!("cargo:rustc-env=GIT_EXACT_TAG={}", exact_tag);
+    let exact_tag = run(&["git", "describe", "--abbrev=0", "--tags", "--exact-match"]).ok();
+    if let Some(ref exact) = exact_tag {
+        println!("cargo:rustc-env=GIT_EXACT_TAG={}", exact);
+    }
 
     // The last available tag, equal to exact_tag when
     // the current commit is tagged
@@ -27,13 +33,25 @@ fn read_git_info() -> Result<(), std::io::Error> {
 
     // The current git commit hash
     let rev = run(&["git", "rev-parse", "HEAD"])?;
-    let rev_short = rev.get(..12).unwrap_or_default();
+    let rev_short = rev.get(..8).unwrap_or_default();
     println!("cargo:rustc-env=GIT_REV={}", rev_short);
 
+    // Combined version
+    let version = if let Some(exact) = exact_tag {
+        exact
+    } else if &branch != "master" {
+        format!("{}-{} ({})", last_tag, rev_short, branch)
+    } else {
+        format!("{}-{}", last_tag, rev_short)
+    };
+    println!("cargo:rustc-env=GIT_VERSION={}", version);
+
     // To access these values, use:
     //    env!("GIT_EXACT_TAG")
     //    env!("GIT_LAST_TAG")
     //    env!("GIT_BRANCH")
     //    env!("GIT_REV")
+    //    env!("GIT_VERSION")
+
     Ok(())
 }