sha1_loose_object_info(): do not return success on missing object

diff --git a/revision.c b/revision.c
index 2f0142f22e21d7cfb1c74ca7035ee962e16dbd9e..ac20d1aaed7b5e1a52682dfd196f87e2f94e87c7 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -15,6 +15,7 @@
 #include "string-list.h"
 #include "line-log.h"
 #include "mailmap.h"
+#include "commit-slab.h"
 
 volatile show_early_output_fn_t show_early_output;
 
@@ -1358,7 +1359,7 @@ static void prepare_show_merge(struct rev_info *revs)
        if (!active_nr)
                read_cache();
        for (i = 0; i < active_nr; i++) {
-               struct cache_entry *ce = active_cache[i];
+               const struct cache_entry *ce = active_cache[i];
                if (!ce_stage(ce))
                        continue;
                if (ce_path_match(ce, &revs->prune_data)) {
@@ -2763,7 +2764,7 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
        return retval;
 }
 
-static inline int want_ancestry(struct rev_info *revs)
+static inline int want_ancestry(const struct rev_info *revs)
 {
        return (revs->rewrite_parents || revs->children.name);
 }
@@ -2820,6 +2821,14 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
        if (action == commit_show &&
            !revs->show_all &&
            revs->prune && revs->dense && want_ancestry(revs)) {
+               /*
+                * --full-diff on simplified parents is no good: it
+                * will show spurious changes from the commits that
+                * were elided.  So we save the parents on the side
+                * when --full-diff is in effect.
+                */
+               if (revs->full_diff)
+                       save_parents(revs, commit);
                if (rewrite_parents(revs, commit, rewrite_one) < 0)
                        return commit_error;
        }
@@ -2839,6 +2848,7 @@ static struct commit *get_revision_1(struct rev_info *revs)
                free(entry);
 
                if (revs->reflog_info) {
+                       save_parents(revs, commit);
                        fake_reflog_parent(revs->reflog_info, commit);
                        commit->object.flags &= ~(ADDED | SEEN | SHOWN);
                }
@@ -3038,6 +3048,8 @@ struct commit *get_revision(struct rev_info *revs)
        c = get_revision_internal(revs);
        if (c && revs->graph)
                graph_update(revs->graph, c);
+       if (!c)
+               free_saved_parents(revs);
        return c;
 }
 
@@ -3069,3 +3081,54 @@ void put_revision_mark(const struct rev_info *revs, const struct commit *commit)
        fputs(mark, stdout);
        putchar(' ');
 }
+
+define_commit_slab(saved_parents, struct commit_list *);
+
+#define EMPTY_PARENT_LIST ((struct commit_list *)-1)
+
+void save_parents(struct rev_info *revs, struct commit *commit)
+{
+       struct commit_list **pp;
+
+       if (!revs->saved_parents_slab) {
+               revs->saved_parents_slab = xmalloc(sizeof(struct saved_parents));
+               init_saved_parents(revs->saved_parents_slab);
+       }
+
+       pp = saved_parents_at(revs->saved_parents_slab, commit);
+
+       /*
+        * When walking with reflogs, we may visit the same commit
+        * several times: once for each appearance in the reflog.
+        *
+        * In this case, save_parents() will be called multiple times.
+        * We want to keep only the first set of parents.  We need to
+        * store a sentinel value for an empty (i.e., NULL) parent
+        * list to distinguish it from a not-yet-saved list, however.
+        */
+       if (*pp)
+               return;
+       if (commit->parents)
+               *pp = copy_commit_list(commit->parents);
+       else
+               *pp = EMPTY_PARENT_LIST;
+}
+
+struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit)
+{
+       struct commit_list *parents;
+
+       if (!revs->saved_parents_slab)
+               return commit->parents;
+
+       parents = *saved_parents_at(revs->saved_parents_slab, commit);
+       if (parents == EMPTY_PARENT_LIST)
+               return NULL;
+       return parents;
+}
+
+void free_saved_parents(struct rev_info *revs)
+{
+       if (revs->saved_parents_slab)
+               clear_saved_parents(revs->saved_parents_slab);
+}