Merge git://ozlabs.org/~paulus/gitk

diff --git a/sha1_file.c b/sha1_file.c
index ee224e412889ce437e71afbc48f111ecae66e118..e13bd2c3ee7edb4d157e499fbcea80535ec5752f 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -807,15 +807,38 @@ void free_pack_by_name(const char *pack_name)
 static unsigned int get_max_fd_limit(void)
 {
 #ifdef RLIMIT_NOFILE
-       struct rlimit lim;
+       {
+               struct rlimit lim;
 
-       if (getrlimit(RLIMIT_NOFILE, &lim))
-               die_errno("cannot get RLIMIT_NOFILE");
+               if (!getrlimit(RLIMIT_NOFILE, &lim))
+                       return lim.rlim_cur;
+       }
+#endif
 
-       return lim.rlim_cur;
-#elif defined(_SC_OPEN_MAX)
-       return sysconf(_SC_OPEN_MAX);
-#elif defined(OPEN_MAX)
+#ifdef _SC_OPEN_MAX
+       {
+               long open_max = sysconf(_SC_OPEN_MAX);
+               if (0 < open_max)
+                       return open_max;
+               /*
+                * Otherwise, we got -1 for one of the two
+                * reasons:
+                *
+                * (1) sysconf() did not understand _SC_OPEN_MAX
+                *     and signaled an error with -1; or
+                * (2) sysconf() said there is no limit.
+                *
+                * We _could_ clear errno before calling sysconf() to
+                * tell these two cases apart and return a huge number
+                * in the latter case to let the caller cap it to a
+                * value that is not so selfish, but letting the
+                * fallback OPEN_MAX codepath take care of these cases
+                * is a lot simpler.
+                */
+       }
+#endif
+
+#ifdef OPEN_MAX
        return OPEN_MAX;
 #else
        return 1; /* see the caller ;-) */
@@ -1667,6 +1690,38 @@ static off_t get_delta_base(struct packed_git *p,
        return base_offset;
 }
 
+/*
+ * Like get_delta_base above, but we return the sha1 instead of the pack
+ * offset. This means it is cheaper for REF deltas (we do not have to do
+ * the final object lookup), but more expensive for OFS deltas (we
+ * have to load the revidx to convert the offset back into a sha1).
+ */
+static const unsigned char *get_delta_base_sha1(struct packed_git *p,
+                                               struct pack_window **w_curs,
+                                               off_t curpos,
+                                               enum object_type type,
+                                               off_t delta_obj_offset)
+{
+       if (type == OBJ_REF_DELTA) {
+               unsigned char *base = use_pack(p, w_curs, curpos, NULL);
+               return base;
+       } else if (type == OBJ_OFS_DELTA) {
+               struct revindex_entry *revidx;
+               off_t base_offset = get_delta_base(p, w_curs, &curpos,
+                                                  type, delta_obj_offset);
+
+               if (!base_offset)
+                       return NULL;
+
+               revidx = find_pack_revindex(p, base_offset);
+               if (!revidx)
+                       return NULL;
+
+               return nth_packed_object_sha1(p, revidx->nr);
+       } else
+               return NULL;
+}
+
 int unpack_object_header(struct packed_git *p,
                         struct pack_window **w_curs,
                         off_t *curpos,
@@ -1824,6 +1879,22 @@ static int packed_object_info(struct packed_git *p, off_t obj_offset,
                }
        }
 
+       if (oi->delta_base_sha1) {
+               if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
+                       const unsigned char *base;
+
+                       base = get_delta_base_sha1(p, &w_curs, curpos,
+                                                  type, obj_offset);
+                       if (!base) {
+                               type = OBJ_BAD;
+                               goto out;
+                       }
+
+                       hashcpy(oi->delta_base_sha1, base);
+               } else
+                       hashclr(oi->delta_base_sha1);
+       }
+
 out:
        unuse_pack(&w_curs);
        return type;
@@ -2407,6 +2478,9 @@ static int sha1_loose_object_info(const unsigned char *sha1,
        git_zstream stream;
        char hdr[32];
 
+       if (oi->delta_base_sha1)
+               hashclr(oi->delta_base_sha1);
+
        /*
         * If we don't care about type or size, then we don't
         * need to look inside the object at all. Note that we
@@ -2458,6 +2532,8 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
                        *(oi->sizep) = co->size;
                if (oi->disk_sizep)
                        *(oi->disk_sizep) = 0;
+               if (oi->delta_base_sha1)
+                       hashclr(oi->delta_base_sha1);
                oi->whence = OI_CACHED;
                return 0;
        }