Merge branch 'jc/triangle-push-fixup'

diff --git a/sha1_file.c b/sha1_file.c
index 5c08701ae85d7bc5a4465ed138fd80b3f3480052..0af19c00f19b56b23bd7d4ad0f27fdd45cd06d90 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -36,6 +36,9 @@ static inline uintmax_t sz_fmt(size_t s) { return s; }
 
 const unsigned char null_sha1[20];
 
+static const char *no_log_pack_access = "no_log_pack_access";
+static const char *log_pack_access;
+
 /*
  * This is meant to hold a *small* number of objects that you would
  * want read_sha1_file() to be able to return, but yet you do not want
@@ -1956,12 +1959,19 @@ static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
 {
        static FILE *log_file;
 
+       if (!log_pack_access)
+               log_pack_access = getenv("GIT_TRACE_PACK_ACCESS");
+       if (!log_pack_access)
+               log_pack_access = no_log_pack_access;
+       if (log_pack_access == no_log_pack_access)
+               return;
+
        if (!log_file) {
                log_file = fopen(log_pack_access, "w");
                if (!log_file) {
                        error("cannot open pack access log '%s' for writing: %s",
                              log_pack_access, strerror(errno));
-                       log_pack_access = NULL;
+                       log_pack_access = no_log_pack_access;
                        return;
                }
        }
@@ -1992,7 +2002,7 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
        int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
        int base_from_cache = 0;
 
-       if (log_pack_access)
+       if (log_pack_access != no_log_pack_access)
                write_pack_access_log(p, obj_offset);
 
        /* PHASE 1: drill down to the innermost base object */
@@ -2135,8 +2145,17 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
                data = patch_delta(base, base_size,
                                   delta_data, delta_size,
                                   &size);
+
+               /*
+                * We could not apply the delta; warn the user, but keep going.
+                * Our failure will be noticed either in the next iteration of
+                * the loop, or if this is the final delta, in the caller when
+                * we return NULL. Those code paths will take care of making
+                * a more explicit warning and retrying with another copy of
+                * the object.
+                */
                if (!data)
-                       die("failed to apply delta");
+                       error("failed to apply delta");
 
                free(delta_data);
        }