1 files changed, 105 insertions, 0 deletions
diff --git a/third_party/git/unpack-trees.h b/third_party/git/unpack-trees.h
new file mode 100644
index 000000000000..ae1557fb8046
--- /dev/null
+++ b/third_party/git/unpack-trees.h
@@ -0,0 +1,105 @@
+#ifndef UNPACK_TREES_H
+#define UNPACK_TREES_H
+
+#include "cache.h"
+#include "argv-array.h"
+#include "string-list.h"
+#include "tree-walk.h"
+
+#define MAX_UNPACK_TREES MAX_TRAVERSE_TREES
+
+struct cache_entry;
+struct unpack_trees_options;
+struct pattern_list;
+
+typedef int (*merge_fn_t)(const struct cache_entry * const *src,
+		struct unpack_trees_options *options);
+
+enum unpack_trees_error_types {
+	ERROR_WOULD_OVERWRITE = 0,
+	ERROR_NOT_UPTODATE_FILE,
+	ERROR_NOT_UPTODATE_DIR,
+	ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN,
+	ERROR_WOULD_LOSE_UNTRACKED_REMOVED,
+	ERROR_BIND_OVERLAP,
+	ERROR_SPARSE_NOT_UPTODATE_FILE,
+	ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN,
+	ERROR_WOULD_LOSE_ORPHANED_REMOVED,
+	ERROR_WOULD_LOSE_SUBMODULE,
+	NB_UNPACK_TREES_ERROR_TYPES
+};
+
+/*
+ * Sets the list of user-friendly error messages to be used by the
+ * command "cmd" (either merge or checkout), and show_all_errors to 1.
+ */
+void setup_unpack_trees_porcelain(struct unpack_trees_options *opts,
+				  const char *cmd);
+
+/*
+ * Frees resources allocated by setup_unpack_trees_porcelain().
+ */
+void clear_unpack_trees_porcelain(struct unpack_trees_options *opts);
+
+struct unpack_trees_options {
+	unsigned int reset,
+		     merge,
+		     update,
+		     clone,
+		     index_only,
+		     nontrivial_merge,
+		     trivial_merges_only,
+		     verbose_update,
+		     aggressive,
+		     skip_unmerged,
+		     initial_checkout,
+		     diff_index_cached,
+		     debug_unpack,
+		     skip_sparse_checkout,
+		     quiet,
+		     exiting_early,
+		     show_all_errors,
+		     dry_run,
+		     keep_pattern_list;
+	const char *prefix;
+	int cache_bottom;
+	struct dir_struct *dir;
+	struct pathspec *pathspec;
+	merge_fn_t fn;
+	const char *msgs[NB_UNPACK_TREES_ERROR_TYPES];
+	struct argv_array msgs_to_free;
+	/*
+	 * Store error messages in an array, each case
+	 * corresponding to a error message type
+	 */
+	struct string_list unpack_rejects[NB_UNPACK_TREES_ERROR_TYPES];
+
+	int head_idx;
+	int merge_size;
+
+	struct cache_entry *df_conflict_entry;
+	void *unpack_data;
+
+	struct index_state *dst_index;
+	struct index_state *src_index;
+	struct index_state result;
+
+	struct pattern_list *pl; /* for internal use */
+};
+
+int unpack_trees(unsigned n, struct tree_desc *t,
+		 struct unpack_trees_options *options);
+
+int verify_uptodate(const struct cache_entry *ce,
+		    struct unpack_trees_options *o);
+
+int threeway_merge(const struct cache_entry * const *stages,
+		   struct unpack_trees_options *o);
+int twoway_merge(const struct cache_entry * const *src,
+		 struct unpack_trees_options *o);
+int bind_merge(const struct cache_entry * const *src,
+	       struct unpack_trees_options *o);
+int oneway_merge(const struct cache_entry * const *src,
+		 struct unpack_trees_options *o);
+
+#endif