Make --no-skip work again

src/ghstack/submit.py

@@ -1374,6 +1374,7 @@ def _create_non_orig_branches(
             push_branches.head.commit is None
             or updated_base
             or push_branches.head.commit.tree != diff.tree
+            or self.no_skip
         ):
             new_head = GitCommitHash(
                 self.sh.git(

src/ghstack/test_prelude.py

@@ -1,3 +1,3 @@
 import argparse
 import atexit
 import contextlib
@@ -189,9 +189,11 @@
     update_fields: bool = False,
     short: bool = False,
     no_skip: bool = False,
+    force: bool = False,
     base: Optional[str] = None,
     revs: Sequence[str] = (),
     stack: bool = True,
+    check_invariants: bool = True,
 ) -> List[ghstack.submit.DiffMeta]:
     self = CTX
     r = ghstack.submit.main(
@@ -204,16 +206,18 @@
         repo_owner_opt="pytorch",
         repo_name_opt="pytorch",
         short=short,
+        force=force,
         direct_opt=self.direct,
         no_skip=no_skip,
         github_url="github.com",
         remote_name="origin",
         base_opt=base,
         revs=revs,
         stack=stack,
-        check_invariants=True,
+        check_invariants=check_invariants,
     )
-    self.check_global_github_invariants(self.direct)
+    if check_invariants:
+        self.check_global_github_invariants(self.direct)
     return r
 
 

test/submit/amend_message_only.py.test

@@ -16,11 +16,14 @@ if is_direct():
 
             This is commit AAA
 
+            * 1774f4b Update A
             * 5cd944b Initial 1
 
         Repository state:
 
-            * 5cd944b (gh/ezyang/1/next, gh/ezyang/1/head)
+            * 1774f4b (gh/ezyang/1/next, gh/ezyang/1/head)
+            |    Update A
+            * 5cd944b
             |    Initial 1
             * dc8bfe4 (HEAD -> master)
                  Initial commit
@@ -36,11 +39,14 @@ else:
 
             This is commit AAA
 
+            * fa3f7db Update A
             * 1081a5b Initial 1
 
         Repository state:
 
-            * 1081a5b (gh/ezyang/1/head)
+            * fa3f7db (gh/ezyang/1/head)
+            |    Update A
+            * 1081a5b
             |    Initial 1
             * 5a32949 (gh/ezyang/1/base)
             |    Initial 1 (base update)

test/submit/no_skip_fixes_remote.py.test

@@ -0,0 +1,78 @@
+from ghstack.test_prelude import *
+
+init_test()
+
+commit("AAA")
+(A,) = gh_submit("Initial")
+
+# Record the correct state before corruption
+correct_head = git("rev-parse", "origin/gh/ezyang/1/head")
+
+# Corrupt the remote head branch by pushing a wrong commit to it
+# We'll push an unrelated commit (just the tree, no proper parents)
+corrupted_commit = git("commit-tree", git("rev-parse", "master^{tree}"), "-m", "Corrupted")
+git("push", "origin", "--force", f"{corrupted_commit}:gh/ezyang/1/head")
+
+# Verify the branch is actually corrupted
+assert git("rev-parse", "origin/gh/ezyang/1/head") == corrupted_commit
+
+# Now submit with --no-skip --force and no local changes
+# This should fix the corrupted remote branch
+(A2,) = gh_submit("Fix", no_skip=True, force=True, check_invariants=False)
+
+# Verify the head branch was restored to a valid state
+# It should have been updated (new commit), not rolled back
+fixed_head = git("rev-parse", "origin/gh/ezyang/1/head")
+assert fixed_head != corrupted_commit
+assert fixed_head != correct_head  # Should be a new commit due to --no-skip
+
+# Verify that the diff between head and base matches the diff in orig
+# This ensures the fix properly maintains diff integrity
+if is_direct():
+    head_base_diff = git("diff", "origin/master", "origin/gh/ezyang/1/head")
+else:
+    head_base_diff = git("diff", "origin/gh/ezyang/1/base", "origin/gh/ezyang/1/head")
+orig_diff = git("diff", "origin/gh/ezyang/1/orig~", "origin/gh/ezyang/1/orig")
+assert head_base_diff == orig_diff, "head/base diff should match orig/orig~ diff"
+
+if is_direct():
+    assert_github_state(
+        """\
+        [O] #500 Commit AAA (gh/ezyang/1/head -> master)
+
+            This is commit AAA
+
+            * 889632c Fix
+            * 94870d6 Corrupted
+
+        Repository state:
+
+            * 889632c (gh/ezyang/1/next, gh/ezyang/1/head)
+            |    Fix
+            * 94870d6
+                 Corrupted
+        """
+    )
+else:
+    assert_github_state(
+        """\
+        [O] #500 Commit AAA (gh/ezyang/1/head -> gh/ezyang/1/base)
+
+            Stack:
+            * __->__ #500
+
+            This is commit AAA
+
+            * 889632c Fix
+            * 94870d6 Corrupted
+
+        Repository state:
+
+            * 889632c (gh/ezyang/1/head)
+            |    Fix
+            * 94870d6
+                 Corrupted
+        """
+    )
+
+ok()