check all sections for lookup before failing

src/file.rs

@@ -245,8 +245,10 @@ impl<'event> GitConfig<'event> {
         // Note: cannot wrap around the raw_multi_value method because we need
         // to guarantee that the highest section id is used (so that we follow
         // the "last one wins" resolution strategy by `git-config`).
-        let section_id = self.get_section_id_by_name_and_subname(section_name, subsection_name)?;
+        let section_ids =
+            self.get_section_ids_by_name_and_subname(section_name, subsection_name)?;
 
+        for section_id in section_ids.iter().rev() {
             let mut found_key = false;
             let mut latest_value = None;
             let mut partial_value = None;
@@ -273,9 +275,13 @@ impl<'event> GitConfig<'event> {
                 }
             }
 
-        latest_value
-            .or_else(|| partial_value.map(normalize_vec))
-            .ok_or(GitConfigError::KeyDoesNotExist(key))
+            match latest_value.or_else(|| partial_value.map(normalize_vec)) {
+                Some(v) => return Ok(v),
+                None => (),
+            }
+        }
+
+        Err(GitConfigError::KeyDoesNotExist(key))
     }
 
     /// Returns a mutable reference to an uninterpreted value given a section,
@@ -297,8 +303,10 @@ impl<'event> GitConfig<'event> {
         // Note: cannot wrap around the raw_multi_value method because we need
         // to guarantee that the highest section id is used (so that we follow
         // the "last one wins" resolution strategy by `git-config`).
-        let section_id = self.get_section_id_by_name_and_subname(section_name, subsection_name)?;
+        let section_ids =
+            self.get_section_ids_by_name_and_subname(section_name, subsection_name)?;
 
+        for section_id in section_ids.iter().rev() {
             let mut size = 0;
             let mut index = 0;
             let mut found_key = false;
@@ -323,15 +331,18 @@ impl<'event> GitConfig<'event> {
             }
 
             if size == 0 {
-            return Err(GitConfigError::KeyDoesNotExist(key));
+                continue;
             }
 
-        Ok(MutableValue {
+            return Ok(MutableValue {
                 section: self.sections.get_mut(&section_id).unwrap(),
                 key,
                 size,
                 index,
-        })
+            });
+        }
+
+        Err(GitConfigError::KeyDoesNotExist(key))
     }
 
     /// Returns all uninterpreted values given a section, an optional subsection
@@ -387,7 +398,7 @@ impl<'event> GitConfig<'event> {
             let mut partial_value = None;
             // section_id is guaranteed to exist in self.sections, else we
             // have a violated invariant.
-            for event in self.sections.get(section_id).unwrap() {
+            for event in self.sections.get(&section_id).unwrap() {
                 match event {
                     Event::Key(event_key) if *event_key == key => found_key = true,
                     Event::Value(v) if found_key => {
@@ -708,24 +719,11 @@ impl<'event> GitConfig<'event> {
         }
     }
 
-    fn get_section_id_by_name_and_subname<'lookup>(
-        &'event self,
-        section_name: &'lookup str,
-        subsection_name: Option<&'lookup str>,
-    ) -> Result<SectionId, GitConfigError<'lookup>> {
-        self.get_section_ids_by_name_and_subname(section_name, subsection_name)
-            .map(|vec| {
-                // get_section_ids_by_name_and_subname is guaranteed to return
-                // a non-empty vec, so max can never return empty.
-                *vec.iter().max().unwrap()
-            })
-    }
-
     fn get_section_ids_by_name_and_subname<'lookup>(
         &self,
         section_name: &'lookup str,
         subsection_name: Option<&'lookup str>,
-    ) -> Result<&[SectionId], GitConfigError<'lookup>> {
+    ) -> Result<Vec<SectionId>, GitConfigError<'lookup>> {
         let section_ids = self
             .section_lookup_tree
             .get(section_name)
@@ -750,7 +748,7 @@ impl<'event> GitConfig<'event> {
             }
         }
         maybe_ids
-            .map(Vec::as_slice)
+            .map(Vec::to_owned)
             .ok_or(GitConfigError::SubSectionDoesNotExist(subsection_name))
     }
 }

tests/integration_tests/file_integeration_test.rs

@@ -69,3 +69,31 @@ fn get_value_for_all_provided_values() -> Result<(), Box<dyn std::error::Error>>
 
     Ok(())
 }
+
+/// There was a regression where lookup would fail because we only checked the
+/// last section entry for any given section and subsection
+#[test]
+fn get_value_looks_up_all_sections_before_failing() -> Result<(), Box<dyn std::error::Error>> {
+    let config = r#"
+        [core]
+            bool-explicit = false
+            bool-implicit = false
+        [core]
+            bool-implicit
+    "#;
+
+    let file = GitConfig::try_from(config)?;
+
+    // Checks that we check the last entry first still
+    assert_eq!(
+        file.get_value::<Boolean>("core", None, "bool-implicit")?,
+        Boolean::True(TrueVariant::Implicit)
+    );
+
+    assert_eq!(
+        file.get_value::<Boolean>("core", None, "bool-explicit")?,
+        Boolean::False(Cow::Borrowed("false"))
+    );
+
+    Ok(())
+}