fix(oma-refresh): fix /var/lib/dpkg/arch file is empty will only fetch binary-all packages metadata (#333)

Author: eatradish

oma-refresh/src/db.rs

@@ -755,9 +755,19 @@ impl<'a> OmaRefresh<'a> {
 
         let index_target_config = IndexTargetConfig::new(self.apt_config, &self.arch);
 
-        let archs_from_file = fs::read_to_string("/var/lib/dpkg/arch")
-            .await
-            .map(|f| f.lines().map(|x| x.to_string()).collect::<Vec<_>>());
+        let archs_from_file = fs::read_to_string("/var/lib/dpkg/arch").await;
+
+        let archs_from_file = if let Ok(file) = archs_from_file {
+            let res = file.lines().map(|x| x.to_string()).collect::<Vec<_>>();
+
+            if res.is_empty() {
+                None
+            } else {
+                Some(res)
+            }
+        } else {
+            None
+        };
 
         let mut flat_repo_no_release = vec![];
 
@@ -813,7 +823,7 @@ impl<'a> OmaRefresh<'a> {
 
                 let mut archs = if let Some(archs) = ose.archs() {
                     archs.iter().map(|x| x.as_str()).collect::<Vec<_>>()
-                } else if let Ok(ref f) = archs_from_file {
+                } else if let Some(ref f) = archs_from_file {
                     f.iter().map(|x| x.as_str()).collect::<Vec<_>>()
                 } else {
                     vec![self.arch.as_str()]