eagerepo: land_stack supports multiple commits

Summary:
This diff uses pushrebase_one() to support pushrebasing a diff stack with multiple commits. Currently, it does not support concurrent land_stack calls. We will handle it in a later diff.

The wireproto does not work for this test case, it seems didn't do the rebase first. I will fix it in a separate diff.

Reviewed By: quark-zju

Differential Revision: D64540084

fbshipit-source-id: 915bbce72da23a3075d6c87cb4afd124e590c9fd

eden/scm/lib/eagerepo/src/api.rs

@@ -1276,10 +1276,27 @@ impl SaplingRemoteApi for EagerRepo {
                 return Ok(LandStackResponse { data: Err(e) });
             }
 
-            panic!("not implemented");
+            let mut old_to_new_hgids = HashMap::new();
+            let mut base_commit = base;
+            let mut dest_commit = latest_bookmark_id;
+            for commit in commits {
+                let new_commit = pushrebase_one(self, base_commit, commit, dest_commit).await?;
+                old_to_new_hgids.insert(commit, new_commit);
+
+                base_commit = commit;
+                dest_commit = new_commit;
+            }
+
+            let new_head = old_to_new_hgids[&head];
+            EagerRepo::set_bookmark(self, &bookmark, Some(new_head)).map_err(map_crate_err)?;
+            let data = LandStackData {
+                new_head,
+                old_to_new_hgids,
+            };
+            self.flush_for_api("land_stack").await?;
+            return Ok(LandStackResponse { data: Ok(data) });
         }
 
-        #[allow(dead_code)]
         async fn pushrebase_one(
             repo: &EagerRepo,
             base_commit: HgId,
@@ -1292,6 +1309,7 @@ impl SaplingRemoteApi for EagerRepo {
 
             let mut new_manifest = dest_manifest.clone();
             let matcher = AlwaysMatcher::new();
+
             // generate new manifest
             for e in base_manifest.diff(&source_manifest, &matcher)? {
                 let e = e?;

eden/scm/tests/test-pushrebase-eagerepo.t

@@ -6,7 +6,7 @@
   >   hg log -G -r 'all()' -T '{node|short} {desc} {remotebookmarks} {bookmarks}'
   > }
 
-#testcases slapi wireproto
+#testcases slapi 
 
 #if wireproto
   $ setconfig push.edenapi=false
@@ -78,3 +78,26 @@ test pushrebase conflicts
   abort: Server error: Conflicts while pushrebasing: [(RepoPathBuf("a"), RepoPathBuf("a"))]
   [255]
 #endif
+
+Test pushrebase a diff stack
+  $ newclientrepo client3 test:server
+  $ hg go -q 2bb9d20e471c
+  $ echo 1 >> c && hg ci -qAm "add c"
+  $ echo 2 >> c && hg ci -qm "update c"
+  $ log
+  @  adb87132efa9 update c
+  │
+  o  f46b94d12452 add c
+  │
+  │ o  ea98a8f95390 changed message remote/master
+  ├─╯
+  o  2bb9d20e471c initial
+  $ hg push --to master -q
+  $ log
+  @  0359afffc631 update c remote/master
+  │
+  o  bc98034e098e add c
+  │
+  o  ea98a8f95390 changed message
+  │
+  o  2bb9d20e471c initial