Merge branch 'ds/commit-and-checkout-with-sparse-index'

"git checkout" and "git commit" learn to work without unnecessarily
expanding sparse indexes.

* ds/commit-and-checkout-with-sparse-index:
  unpack-trees: resolve sparse-directory/file conflicts
  t1092: document bad 'git checkout' behavior
  checkout: stop expanding sparse indexes
  sparse-index: recompute cache-tree
  commit: integrate with sparse-index
  p2000: compress repo names
  p2000: add 'git checkout -' test and decrease depth

1 files changed, 11 insertions, 0 deletions

diff --git a/unpack-trees.c b/unpack-trees.c
index afc39db..5786645 100644
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -2608,6 +2608,17 @@ int twoway_merge(const struct cache_entry * const *src,
 			 same(current, oldtree) && !same(current, newtree)) {
 			/* 20 or 21 */
 			return merged_entry(newtree, current, o);
+		} else if (current && !oldtree && newtree &&
+			   S_ISSPARSEDIR(current->ce_mode) != S_ISSPARSEDIR(newtree->ce_mode) &&
+			   ce_stage(current) == 0) {
+			/*
+			 * This case is a directory/file conflict across the sparse-index
+			 * boundary. When we are changing from one path to another via
+			 * 'git checkout', then we want to replace one entry with another
+			 * via merged_entry(). If there are staged changes, then we should
+			 * reject the merge instead.
+			 */
+			return merged_entry(newtree, current, o);
 		} else
 			return reject_merge(current, o);
 	}