build.rs: Report if share tree is empty

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

1 files changed, 8 insertions, 1 deletions

diff --git a/build.rs b/build.rs
index e86db58..2f2cefb 100644
--- a/build.rs
+++ b/build.rs
@@ -16,7 +16,7 @@
 //! if set, it causes a resource fallback path of `/usr/share/subplot` to be
 //! added to the resources search path automatically.
 
-use anyhow::Result;
+use anyhow::{anyhow, Result};
 use std::io::Write;
 use std::path::{Component, Path, PathBuf};
 use walkdir::WalkDir;
@@ -91,6 +91,13 @@ fn gather_share_files() -> Result<Vec<PathBuf>> {
         ret.push(entry_path.into());
     }
 
+    if ret.is_empty() {
+        return Err(anyhow!(
+            "Unable to find any resources in `{}`",
+            base_path.display()
+        ));
+    }
+
     Ok(ret)
 }