Validate APT config before creating build workspace

1 files changed, 3 insertions, 0 deletions

diff --git a/src/package_installer.rs b/src/package_installer.rs
index c5c6451..03e429f 100644
--- a/src/package_installer.rs
+++ b/src/package_installer.rs
@@ -11,6 +11,9 @@ impl AptConfig {
         if path.as_os_str().is_empty() || path.is_dir() {
             bail!("APT configuration must be a file path: {}", path.display());
         }
+        if !path.is_file() {
+            bail!("APT configuration does not exist or is not a regular file: {}", path.display());
+        }
         Ok(Self(path.to_path_buf()))
     }