rev-list: handle missing tree objects properly

diff --git a/revision.h b/revision.h
index bf2239f87689d9486c4b888bed5cba6affa21953..5118aaaa9242c86080febfff9a3d0ab48da19b64 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -20,8 +20,9 @@
 #define SYMMETRIC_LEFT (1u<<8)
 #define PATCHSAME      (1u<<9)
 #define BOTTOM         (1u<<10)
+#define USER_GIVEN     (1u<<25) /* given directly by the user */
 #define TRACK_LINEAR   (1u<<26)
-#define ALL_REV_FLAGS  (((1u<<11)-1) | TRACK_LINEAR)
+#define ALL_REV_FLAGS  (((1u<<11)-1) | USER_GIVEN | TRACK_LINEAR)
 
 #define DECORATE_SHORT_REFS    1
 #define DECORATE_FULL_REFS     2
@@ -124,6 +125,21 @@ struct rev_info {
                        line_level_traverse:1,
                        tree_blobs_in_commit_order:1,
 
+                       /*
+                        * Blobs are shown without regard for their existence.
+                        * But not so for trees: unless exclude_promisor_objects
+                        * is set and the tree in question is a promisor object;
+                        * OR ignore_missing_links is set, the revision walker
+                        * dies with a "bad tree object HASH" message when
+                        * encountering a missing tree. For callers that can
+                        * handle missing trees and want them to be filterable
+                        * and showable, set this to true. The revision walker
+                        * will filter and show such a missing tree as usual,
+                        * but will not attempt to recurse into this tree
+                        * object.
+                        */
+                       do_not_die_on_missing_tree:1,
+
                        /* for internal use only */
                        exclude_promisor_objects:1;