Merge branch 'maint-1.7.6' into maint-1.7.7

* maint-1.7.6:
  Update draft release notes to 1.7.6.6
  thin-pack: try harder to use preferred base objects as base

diff --git a/Documentation/RelNotes/1.7.6.6.txt b/Documentation/RelNotes/1.7.6.6.txt
index 13ce2dc2d7823dfd09d97af8826f9fdcfe79672d..5343e004005e888612305742d75cde68ff157846 100644 (file)
--- a/Documentation/RelNotes/1.7.6.6.txt
+++ b/Documentation/RelNotes/1.7.6.6.txt
@@ -8,4 +8,9 @@ Fixes since v1.7.6.5
    directory when two paths in question are in adjacent directories and
    the name of the one directory is a prefix of the other.
 
+ * When producing a "thin pack" (primarily used in bundles and smart
+   HTTP transfers) out of a fully packed repository, we unnecessarily
+   avoided sending recent objects as a delta against objects we know
+   the other side has.
+
 Also contains minor fixes and documentation updates.

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index 80ab6c39f91b30be90203da777fd8e3989abdc2c..638d43da0e61c67a374ee124faf9391180171b21 100644 (file)
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c
@@ -1421,11 +1421,16 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
                return -1;
 
        /*
-        * We do not bother to try a delta that we discarded
-        * on an earlier try, but only when reusing delta data.
+        * We do not bother to try a delta that we discarded on an
+        * earlier try, but only when reusing delta data.  Note that
+        * src_entry that is marked as the preferred_base should always
+        * be considered, as even if we produce a suboptimal delta against
+        * it, we will still save the transfer cost, as we already know
+        * the other side has it and we won't send src_entry at all.
         */
        if (reuse_delta && trg_entry->in_pack &&
            trg_entry->in_pack == src_entry->in_pack &&
+           !src_entry->preferred_base &&
            trg_entry->in_pack_type != OBJ_REF_DELTA &&
            trg_entry->in_pack_type != OBJ_OFS_DELTA)
                return 0;