Only fetch single object in shallow mode for compatibility

Author: Byron

src/cargo/sources/git/utils.rs

@@ -900,10 +900,15 @@ pub fn fetch(
                 refspecs.push(format!("+{0}:{0}", rev));
             } else if let Some(oid_to_fetch) = oid_to_fetch {
                 refspecs.push(format!("+{0}:refs/commit/{0}", oid_to_fetch));
-            } else if rev.parse::<Oid>().is_ok() {
-                // There is a specific commit to fetch and we will just do so in shallow-mode only
-                // to not disturb the previous logic. Note that with typical settings for shallowing,
-                // we will just fetch a single `rev` as single commit.
+            } else if !matches!(shallow, gix::remote::fetch::Shallow::NoChange)
+                && rev.parse::<Oid>().is_ok()
+            {
+                // There is a specific commit to fetch and we will do so in shallow-mode only
+                // to not disturb the previous logic.
+                // Note that with typical settings for shallowing, we will just fetch a single `rev`
+                // as single commit.
+                // The reason we write to `refs/remotes/origin/HEAD` is that it's of special significance
+                // when during `GitReference::resolve()`, but otherwise it shouldn't matter.
                 refspecs.push(format!("+{0}:refs/remotes/origin/HEAD", rev));
             } else {
                 // We don't know what the rev will point to. To handle this

tests/testsuite/git.rs

@@ -948,13 +948,6 @@ fn dep_with_bad_submodule() {
             None,
         )
         .unwrap();
-    std::fs::remove_file(
-        repo.path()
-            .join("objects")
-            .join(&commit.id().to_string()[..2])
-            .join(&commit.id().to_string()[2..]),
-    )
-    .unwrap();
 
     let p = project
         .file(
@@ -979,36 +972,9 @@ fn dep_with_bad_submodule() {
             "extern crate dep1; pub fn foo() { dep1::dep() }",
         )
         .build();
-    let expected = if cargo_uses_gitoxide() {
-        format!(
-            "\
-[UPDATING] git repository [..]
-[UPDATING] git submodule `file://[..]/dep2`
-[ERROR] failed to get `dep1` as a dependency of package `foo v0.5.0 [..]`
-
-Caused by:
-  failed to load source for dependency `dep1`
-
-Caused by:
-  Unable to update {}
-
-Caused by:
-  failed to update submodule `src`
 
-Caused by:
-  failed to fetch submodule `src` from [..]
-
-Caused by:
-  Could not decode server reply
-
-Caused by:
-  upload-pack: not our ref [..]
-",
-            path2url(git_project.root())
-        )
-    } else {
-        format!(
-            "\
+    let expected = format!(
+        "\
 [UPDATING] git repository [..]
 [UPDATING] git submodule `file://[..]/dep2`
 [ERROR] failed to get `dep1` as a dependency of package `foo v0.5.0 [..]`
@@ -1023,14 +989,10 @@ Caused by:
   failed to update submodule `src`
 
 Caused by:
-  failed to fetch submodule `src` from [..]
-
-Caused by:
-  target OID for the reference doesn't exist on the repository; class=Reference (4)
+  object not found - no match for id [..]
 ",
-            path2url(git_project.root())
-        )
-    };
+        path2url(git_project.root())
+    );
 
     p.cargo("check")
         .with_stderr(expected)