Merge branch 'br/blame-ignore'
[gitweb.git] / commit-graph.c
index 7c5e54875fdacdf77235a077c9928f7d3bf0d001..8cc1d1d6c3aff0842c42ecda5cc545c9eb085802 100644 (file)
@@ -361,10 +361,10 @@ int generation_numbers_enabled(struct repository *r)
        return !!first_generation;
 }
 
-void close_commit_graph(struct repository *r)
+void close_commit_graph(struct raw_object_store *o)
 {
-       free_commit_graph(r->objects->commit_graph);
-       r->objects->commit_graph = NULL;
+       free_commit_graph(o->commit_graph);
+       o->commit_graph = NULL;
 }
 
 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
@@ -525,14 +525,38 @@ struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit
        return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
 }
 
+struct packed_commit_list {
+       struct commit **list;
+       int nr;
+       int alloc;
+};
+
+struct packed_oid_list {
+       struct object_id *list;
+       int nr;
+       int alloc;
+};
+
+struct write_commit_graph_context {
+       struct repository *r;
+       const char *obj_dir;
+       char *graph_name;
+       struct packed_oid_list oids;
+       struct packed_commit_list commits;
+       int num_extra_edges;
+       unsigned long approx_nr_objects;
+       struct progress *progress;
+       int progress_done;
+       uint64_t progress_cnt;
+       unsigned append:1,
+                report_progress:1;
+};
+
 static void write_graph_chunk_fanout(struct hashfile *f,
-                                    struct commit **commits,
-                                    int nr_commits,
-                                    struct progress *progress,
-                                    uint64_t *progress_cnt)
+                                    struct write_commit_graph_context *ctx)
 {
        int i, count = 0;
-       struct commit **list = commits;
+       struct commit **list = ctx->commits.list;
 
        /*
         * Write the first-level table (the list is sorted,
@@ -540,10 +564,10 @@ static void write_graph_chunk_fanout(struct hashfile *f,
         * having to do eight extra binary search iterations).
         */
        for (i = 0; i < 256; i++) {
-               while (count < nr_commits) {
+               while (count < ctx->commits.nr) {
                        if ((*list)->object.oid.hash[0] != i)
                                break;
-                       display_progress(progress, ++*progress_cnt);
+                       display_progress(ctx->progress, ++ctx->progress_cnt);
                        count++;
                        list++;
                }
@@ -553,14 +577,12 @@ static void write_graph_chunk_fanout(struct hashfile *f,
 }
 
 static void write_graph_chunk_oids(struct hashfile *f, int hash_len,
-                                  struct commit **commits, int nr_commits,
-                                  struct progress *progress,
-                                  uint64_t *progress_cnt)
+                                  struct write_commit_graph_context *ctx)
 {
-       struct commit **list = commits;
+       struct commit **list = ctx->commits.list;
        int count;
-       for (count = 0; count < nr_commits; count++, list++) {
-               display_progress(progress, ++*progress_cnt);
+       for (count = 0; count < ctx->commits.nr; count++, list++) {
+               display_progress(ctx->progress, ++ctx->progress_cnt);
                hashwrite(f, (*list)->object.oid.hash, (int)hash_len);
        }
 }
@@ -572,19 +594,17 @@ static const unsigned char *commit_to_sha1(size_t index, void *table)
 }
 
 static void write_graph_chunk_data(struct hashfile *f, int hash_len,
-                                  struct commit **commits, int nr_commits,
-                                  struct progress *progress,
-                                  uint64_t *progress_cnt)
+                                  struct write_commit_graph_context *ctx)
 {
-       struct commit **list = commits;
-       struct commit **last = commits + nr_commits;
+       struct commit **list = ctx->commits.list;
+       struct commit **last = ctx->commits.list + ctx->commits.nr;
        uint32_t num_extra_edges = 0;
 
        while (list < last) {
                struct commit_list *parent;
                int edge_value;
                uint32_t packedDate[2];
-               display_progress(progress, ++*progress_cnt);
+               display_progress(ctx->progress, ++ctx->progress_cnt);
 
                parse_commit_no_graph(*list);
                hashwrite(f, get_commit_tree_oid(*list)->hash, hash_len);
@@ -595,8 +615,8 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
                        edge_value = GRAPH_PARENT_NONE;
                else {
                        edge_value = sha1_pos(parent->item->object.oid.hash,
-                                             commits,
-                                             nr_commits,
+                                             ctx->commits.list,
+                                             ctx->commits.nr,
                                              commit_to_sha1);
 
                        if (edge_value < 0)
@@ -616,8 +636,8 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
                        edge_value = GRAPH_EXTRA_EDGES_NEEDED | num_extra_edges;
                else {
                        edge_value = sha1_pos(parent->item->object.oid.hash,
-                                             commits,
-                                             nr_commits,
+                                             ctx->commits.list,
+                                             ctx->commits.nr,
                                              commit_to_sha1);
                        if (edge_value < 0)
                                BUG("missing parent %s for commit %s",
@@ -649,19 +669,16 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
 }
 
 static void write_graph_chunk_extra_edges(struct hashfile *f,
-                                         struct commit **commits,
-                                         int nr_commits,
-                                         struct progress *progress,
-                                         uint64_t *progress_cnt)
+                                         struct write_commit_graph_context *ctx)
 {
-       struct commit **list = commits;
-       struct commit **last = commits + nr_commits;
+       struct commit **list = ctx->commits.list;
+       struct commit **last = ctx->commits.list + ctx->commits.nr;
        struct commit_list *parent;
 
        while (list < last) {
                int num_parents = 0;
 
-               display_progress(progress, ++*progress_cnt);
+               display_progress(ctx->progress, ++ctx->progress_cnt);
 
                for (parent = (*list)->parents; num_parents < 3 && parent;
                     parent = parent->next)
@@ -675,8 +692,8 @@ static void write_graph_chunk_extra_edges(struct hashfile *f,
                /* Since num_parents > 2, this initializer is safe. */
                for (parent = (*list)->parents->next; parent; parent = parent->next) {
                        int edge_value = sha1_pos(parent->item->object.oid.hash,
-                                                 commits,
-                                                 nr_commits,
+                                                 ctx->commits.list,
+                                                 ctx->commits.nr,
                                                  commit_to_sha1);
 
                        if (edge_value < 0)
@@ -700,125 +717,111 @@ static int commit_compare(const void *_a, const void *_b)
        return oidcmp(a, b);
 }
 
-struct packed_commit_list {
-       struct commit **list;
-       int nr;
-       int alloc;
-};
-
-struct packed_oid_list {
-       struct object_id *list;
-       int nr;
-       int alloc;
-       struct progress *progress;
-       int progress_done;
-};
-
 static int add_packed_commits(const struct object_id *oid,
                              struct packed_git *pack,
                              uint32_t pos,
                              void *data)
 {
-       struct packed_oid_list *list = (struct packed_oid_list*)data;
+       struct write_commit_graph_context *ctx = (struct write_commit_graph_context*)data;
        enum object_type type;
        off_t offset = nth_packed_object_offset(pack, pos);
        struct object_info oi = OBJECT_INFO_INIT;
 
-       if (list->progress)
-               display_progress(list->progress, ++list->progress_done);
+       if (ctx->progress)
+               display_progress(ctx->progress, ++ctx->progress_done);
 
        oi.typep = &type;
-       if (packed_object_info(the_repository, pack, offset, &oi) < 0)
+       if (packed_object_info(ctx->r, pack, offset, &oi) < 0)
                die(_("unable to get type of object %s"), oid_to_hex(oid));
 
        if (type != OBJ_COMMIT)
                return 0;
 
-       ALLOC_GROW(list->list, list->nr + 1, list->alloc);
-       oidcpy(&(list->list[list->nr]), oid);
-       list->nr++;
+       ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
+       oidcpy(&(ctx->oids.list[ctx->oids.nr]), oid);
+       ctx->oids.nr++;
 
        return 0;
 }
 
-static void add_missing_parents(struct packed_oid_list *oids, struct commit *commit)
+static void add_missing_parents(struct write_commit_graph_context *ctx, struct commit *commit)
 {
        struct commit_list *parent;
        for (parent = commit->parents; parent; parent = parent->next) {
                if (!(parent->item->object.flags & UNINTERESTING)) {
-                       ALLOC_GROW(oids->list, oids->nr + 1, oids->alloc);
-                       oidcpy(&oids->list[oids->nr], &(parent->item->object.oid));
-                       oids->nr++;
+                       ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
+                       oidcpy(&ctx->oids.list[ctx->oids.nr], &(parent->item->object.oid));
+                       ctx->oids.nr++;
                        parent->item->object.flags |= UNINTERESTING;
                }
        }
 }
 
-static void close_reachable(struct packed_oid_list *oids, int report_progress)
+static void close_reachable(struct write_commit_graph_context *ctx)
 {
        int i;
        struct commit *commit;
-       struct progress *progress = NULL;
 
-       if (report_progress)
-               progress = start_delayed_progress(
-                       _("Loading known commits in commit graph"), oids->nr);
-       for (i = 0; i < oids->nr; i++) {
-               display_progress(progress, i + 1);
-               commit = lookup_commit(the_repository, &oids->list[i]);
+       if (ctx->report_progress)
+               ctx->progress = start_delayed_progress(
+                                       _("Loading known commits in commit graph"),
+                                       ctx->oids.nr);
+       for (i = 0; i < ctx->oids.nr; i++) {
+               display_progress(ctx->progress, i + 1);
+               commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
                if (commit)
                        commit->object.flags |= UNINTERESTING;
        }
-       stop_progress(&progress);
+       stop_progress(&ctx->progress);
 
        /*
-        * As this loop runs, oids->nr may grow, but not more
+        * As this loop runs, ctx->oids.nr may grow, but not more
         * than the number of missing commits in the reachable
         * closure.
         */
-       if (report_progress)
-               progress = start_delayed_progress(
-                       _("Expanding reachable commits in commit graph"), oids->nr);
-       for (i = 0; i < oids->nr; i++) {
-               display_progress(progress, i + 1);
-               commit = lookup_commit(the_repository, &oids->list[i]);
+       if (ctx->report_progress)
+               ctx->progress = start_delayed_progress(
+                                       _("Expanding reachable commits in commit graph"),
+                                       ctx->oids.nr);
+       for (i = 0; i < ctx->oids.nr; i++) {
+               display_progress(ctx->progress, i + 1);
+               commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
 
                if (commit && !parse_commit_no_graph(commit))
-                       add_missing_parents(oids, commit);
+                       add_missing_parents(ctx, commit);
        }
-       stop_progress(&progress);
+       stop_progress(&ctx->progress);
 
-       if (report_progress)
-               progress = start_delayed_progress(
-                       _("Clearing commit marks in commit graph"), oids->nr);
-       for (i = 0; i < oids->nr; i++) {
-               display_progress(progress, i + 1);
-               commit = lookup_commit(the_repository, &oids->list[i]);
+       if (ctx->report_progress)
+               ctx->progress = start_delayed_progress(
+                                       _("Clearing commit marks in commit graph"),
+                                       ctx->oids.nr);
+       for (i = 0; i < ctx->oids.nr; i++) {
+               display_progress(ctx->progress, i + 1);
+               commit = lookup_commit(ctx->r, &ctx->oids.list[i]);
 
                if (commit)
                        commit->object.flags &= ~UNINTERESTING;
        }
-       stop_progress(&progress);
+       stop_progress(&ctx->progress);
 }
 
-static void compute_generation_numbers(struct packed_commit_list* commits,
-                                      int report_progress)
+static void compute_generation_numbers(struct write_commit_graph_context *ctx)
 {
        int i;
        struct commit_list *list = NULL;
-       struct progress *progress = NULL;
 
-       if (report_progress)
-               progress = start_progress(
-                       _("Computing commit graph generation numbers"),
-                       commits->nr);
-       for (i = 0; i < commits->nr; i++) {
-               display_progress(progress, i + 1);
-               if (commits->list[i]->generation != GENERATION_NUMBER_INFINITY &&
-                   commits->list[i]->generation != GENERATION_NUMBER_ZERO)
+       if (ctx->report_progress)
+               ctx->progress = start_progress(
+                                       _("Computing commit graph generation numbers"),
+                                       ctx->commits.nr);
+       for (i = 0; i < ctx->commits.nr; i++) {
+               display_progress(ctx->progress, i + 1);
+               if (ctx->commits.list[i]->generation != GENERATION_NUMBER_INFINITY &&
+                   ctx->commits.list[i]->generation != GENERATION_NUMBER_ZERO)
                        continue;
 
-               commit_list_insert(commits->list[i], &list);
+               commit_list_insert(ctx->commits.list[i], &list);
                while (list) {
                        struct commit *current = list->item;
                        struct commit_list *parent;
@@ -845,7 +848,7 @@ static void compute_generation_numbers(struct packed_commit_list* commits,
                        }
                }
        }
-       stop_progress(&progress);
+       stop_progress(&ctx->progress);
 }
 
 static int add_ref_to_list(const char *refname,
@@ -858,207 +861,187 @@ static int add_ref_to_list(const char *refname,
        return 0;
 }
 
-void write_commit_graph_reachable(const char *obj_dir, int append,
-                                 int report_progress)
+int write_commit_graph_reachable(const char *obj_dir, unsigned int flags)
 {
        struct string_list list = STRING_LIST_INIT_DUP;
+       int result;
 
        for_each_ref(add_ref_to_list, &list);
-       write_commit_graph(obj_dir, NULL, &list, append, report_progress);
+       result = write_commit_graph(obj_dir, NULL, &list,
+                                   flags);
 
        string_list_clear(&list, 0);
+       return result;
 }
 
-void write_commit_graph(const char *obj_dir,
-                       struct string_list *pack_indexes,
-                       struct string_list *commit_hex,
-                       int append, int report_progress)
+static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
+                               struct string_list *pack_indexes)
 {
-       struct packed_oid_list oids;
-       struct packed_commit_list commits;
-       struct hashfile *f;
-       uint32_t i, count_distinct = 0;
-       char *graph_name;
-       struct lock_file lk = LOCK_INIT;
-       uint32_t chunk_ids[5];
-       uint64_t chunk_offsets[5];
-       int num_chunks;
-       int num_extra_edges;
-       struct commit_list *parent;
-       struct progress *progress = NULL;
-       const unsigned hashsz = the_hash_algo->rawsz;
-       uint64_t progress_cnt = 0;
+       uint32_t i;
        struct strbuf progress_title = STRBUF_INIT;
-       unsigned long approx_nr_objects;
-
-       if (!commit_graph_compatible(the_repository))
-               return;
-
-       oids.nr = 0;
-       approx_nr_objects = approximate_object_count();
-       oids.alloc = approx_nr_objects / 32;
-       oids.progress = NULL;
-       oids.progress_done = 0;
+       struct strbuf packname = STRBUF_INIT;
+       int dirlen;
 
-       if (append) {
-               prepare_commit_graph_one(the_repository, obj_dir);
-               if (the_repository->objects->commit_graph)
-                       oids.alloc += the_repository->objects->commit_graph->num_commits;
+       strbuf_addf(&packname, "%s/pack/", ctx->obj_dir);
+       dirlen = packname.len;
+       if (ctx->report_progress) {
+               strbuf_addf(&progress_title,
+                           Q_("Finding commits for commit graph in %d pack",
+                              "Finding commits for commit graph in %d packs",
+                              pack_indexes->nr),
+                           pack_indexes->nr);
+               ctx->progress = start_delayed_progress(progress_title.buf, 0);
+               ctx->progress_done = 0;
        }
-
-       if (oids.alloc < 1024)
-               oids.alloc = 1024;
-       ALLOC_ARRAY(oids.list, oids.alloc);
-
-       if (append && the_repository->objects->commit_graph) {
-               struct commit_graph *commit_graph =
-                       the_repository->objects->commit_graph;
-               for (i = 0; i < commit_graph->num_commits; i++) {
-                       const unsigned char *hash = commit_graph->chunk_oid_lookup +
-                               commit_graph->hash_len * i;
-                       hashcpy(oids.list[oids.nr++].hash, hash);
+       for (i = 0; i < pack_indexes->nr; i++) {
+               struct packed_git *p;
+               strbuf_setlen(&packname, dirlen);
+               strbuf_addstr(&packname, pack_indexes->items[i].string);
+               p = add_packed_git(packname.buf, packname.len, 1);
+               if (!p) {
+                       error(_("error adding pack %s"), packname.buf);
+                       return -1;
+               }
+               if (open_pack_index(p)) {
+                       error(_("error opening index for %s"), packname.buf);
+                       return -1;
                }
+               for_each_object_in_pack(p, add_packed_commits, ctx,
+                                       FOR_EACH_OBJECT_PACK_ORDER);
+               close_pack(p);
+               free(p);
        }
 
-       if (pack_indexes) {
-               struct strbuf packname = STRBUF_INIT;
-               int dirlen;
-               strbuf_addf(&packname, "%s/pack/", obj_dir);
-               dirlen = packname.len;
-               if (report_progress) {
-                       strbuf_addf(&progress_title,
-                                   Q_("Finding commits for commit graph in %d pack",
-                                      "Finding commits for commit graph in %d packs",
-                                      pack_indexes->nr),
-                                   pack_indexes->nr);
-                       oids.progress = start_delayed_progress(progress_title.buf, 0);
-                       oids.progress_done = 0;
-               }
-               for (i = 0; i < pack_indexes->nr; i++) {
-                       struct packed_git *p;
-                       strbuf_setlen(&packname, dirlen);
-                       strbuf_addstr(&packname, pack_indexes->items[i].string);
-                       p = add_packed_git(packname.buf, packname.len, 1);
-                       if (!p)
-                               die(_("error adding pack %s"), packname.buf);
-                       if (open_pack_index(p))
-                               die(_("error opening index for %s"), packname.buf);
-                       for_each_object_in_pack(p, add_packed_commits, &oids,
-                                               FOR_EACH_OBJECT_PACK_ORDER);
-                       close_pack(p);
-                       free(p);
-               }
-               stop_progress(&oids.progress);
-               strbuf_reset(&progress_title);
-               strbuf_release(&packname);
+       stop_progress(&ctx->progress);
+       strbuf_reset(&progress_title);
+       strbuf_release(&packname);
+
+       return 0;
+}
+
+static void fill_oids_from_commit_hex(struct write_commit_graph_context *ctx,
+                                     struct string_list *commit_hex)
+{
+       uint32_t i;
+       struct strbuf progress_title = STRBUF_INIT;
+
+       if (ctx->report_progress) {
+               strbuf_addf(&progress_title,
+                           Q_("Finding commits for commit graph from %d ref",
+                              "Finding commits for commit graph from %d refs",
+                              commit_hex->nr),
+                           commit_hex->nr);
+               ctx->progress = start_delayed_progress(
+                                       progress_title.buf,
+                                       commit_hex->nr);
        }
+       for (i = 0; i < commit_hex->nr; i++) {
+               const char *end;
+               struct object_id oid;
+               struct commit *result;
+
+               display_progress(ctx->progress, i + 1);
+               if (commit_hex->items[i].string &&
+                   parse_oid_hex(commit_hex->items[i].string, &oid, &end))
+                       continue;
 
-       if (commit_hex) {
-               if (report_progress) {
-                       strbuf_addf(&progress_title,
-                                   Q_("Finding commits for commit graph from %d ref",
-                                      "Finding commits for commit graph from %d refs",
-                                      commit_hex->nr),
-                                   commit_hex->nr);
-                       progress = start_delayed_progress(progress_title.buf,
-                                                         commit_hex->nr);
-               }
-               for (i = 0; i < commit_hex->nr; i++) {
-                       const char *end;
-                       struct object_id oid;
-                       struct commit *result;
-
-                       display_progress(progress, i + 1);
-                       if (commit_hex->items[i].string &&
-                           parse_oid_hex(commit_hex->items[i].string, &oid, &end))
-                               continue;
-
-                       result = lookup_commit_reference_gently(the_repository, &oid, 1);
-
-                       if (result) {
-                               ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc);
-                               oidcpy(&oids.list[oids.nr], &(result->object.oid));
-                               oids.nr++;
-                       }
+               result = lookup_commit_reference_gently(ctx->r, &oid, 1);
+
+               if (result) {
+                       ALLOC_GROW(ctx->oids.list, ctx->oids.nr + 1, ctx->oids.alloc);
+                       oidcpy(&ctx->oids.list[ctx->oids.nr], &(result->object.oid));
+                       ctx->oids.nr++;
                }
-               stop_progress(&progress);
-               strbuf_reset(&progress_title);
        }
+       stop_progress(&ctx->progress);
+       strbuf_release(&progress_title);
+}
 
-       if (!pack_indexes && !commit_hex) {
-               if (report_progress)
-                       oids.progress = start_delayed_progress(
-                               _("Finding commits for commit graph among packed objects"),
-                               approx_nr_objects);
-               for_each_packed_object(add_packed_commits, &oids,
-                                      FOR_EACH_OBJECT_PACK_ORDER);
-               if (oids.progress_done < approx_nr_objects)
-                       display_progress(oids.progress, approx_nr_objects);
-               stop_progress(&oids.progress);
-       }
+static void fill_oids_from_all_packs(struct write_commit_graph_context *ctx)
+{
+       if (ctx->report_progress)
+               ctx->progress = start_delayed_progress(
+                       _("Finding commits for commit graph among packed objects"),
+                       ctx->approx_nr_objects);
+       for_each_packed_object(add_packed_commits, ctx,
+                              FOR_EACH_OBJECT_PACK_ORDER);
+       if (ctx->progress_done < ctx->approx_nr_objects)
+               display_progress(ctx->progress, ctx->approx_nr_objects);
+       stop_progress(&ctx->progress);
+}
 
-       close_reachable(&oids, report_progress);
+static uint32_t count_distinct_commits(struct write_commit_graph_context *ctx)
+{
+       uint32_t i, count_distinct = 1;
 
-       if (report_progress)
-               progress = start_delayed_progress(
+       if (ctx->report_progress)
+               ctx->progress = start_delayed_progress(
                        _("Counting distinct commits in commit graph"),
-                       oids.nr);
-       display_progress(progress, 0); /* TODO: Measure QSORT() progress */
-       QSORT(oids.list, oids.nr, commit_compare);
-       count_distinct = 1;
-       for (i = 1; i < oids.nr; i++) {
-               display_progress(progress, i + 1);
-               if (!oideq(&oids.list[i - 1], &oids.list[i]))
+                       ctx->oids.nr);
+       display_progress(ctx->progress, 0); /* TODO: Measure QSORT() progress */
+       QSORT(ctx->oids.list, ctx->oids.nr, commit_compare);
+
+       for (i = 1; i < ctx->oids.nr; i++) {
+               display_progress(ctx->progress, i + 1);
+               if (!oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
                        count_distinct++;
        }
-       stop_progress(&progress);
+       stop_progress(&ctx->progress);
 
-       if (count_distinct >= GRAPH_EDGE_LAST_MASK)
-               die(_("the commit graph format cannot write %d commits"), count_distinct);
+       return count_distinct;
+}
 
-       commits.nr = 0;
-       commits.alloc = count_distinct;
-       ALLOC_ARRAY(commits.list, commits.alloc);
+static void copy_oids_to_commits(struct write_commit_graph_context *ctx)
+{
+       uint32_t i;
+       struct commit_list *parent;
 
-       num_extra_edges = 0;
-       if (report_progress)
-               progress = start_delayed_progress(
+       ctx->num_extra_edges = 0;
+       if (ctx->report_progress)
+               ctx->progress = start_delayed_progress(
                        _("Finding extra edges in commit graph"),
-                       oids.nr);
-       for (i = 0; i < oids.nr; i++) {
+                       ctx->oids.nr);
+       for (i = 0; i < ctx->oids.nr; i++) {
                int num_parents = 0;
-               display_progress(progress, i + 1);
-               if (i > 0 && oideq(&oids.list[i - 1], &oids.list[i]))
+               display_progress(ctx->progress, i + 1);
+               if (i > 0 && oideq(&ctx->oids.list[i - 1], &ctx->oids.list[i]))
                        continue;
 
-               commits.list[commits.nr] = lookup_commit(the_repository, &oids.list[i]);
-               parse_commit_no_graph(commits.list[commits.nr]);
+               ctx->commits.list[ctx->commits.nr] = lookup_commit(ctx->r, &ctx->oids.list[i]);
+               parse_commit_no_graph(ctx->commits.list[ctx->commits.nr]);
 
-               for (parent = commits.list[commits.nr]->parents;
+               for (parent = ctx->commits.list[ctx->commits.nr]->parents;
                     parent; parent = parent->next)
                        num_parents++;
 
                if (num_parents > 2)
-                       num_extra_edges += num_parents - 1;
+                       ctx->num_extra_edges += num_parents - 1;
 
-               commits.nr++;
+               ctx->commits.nr++;
        }
-       num_chunks = num_extra_edges ? 4 : 3;
-       stop_progress(&progress);
-
-       if (commits.nr >= GRAPH_EDGE_LAST_MASK)
-               die(_("too many commits to write graph"));
-
-       compute_generation_numbers(&commits, report_progress);
+       stop_progress(&ctx->progress);
+}
 
-       graph_name = get_commit_graph_filename(obj_dir);
-       if (safe_create_leading_directories(graph_name)) {
-               UNLEAK(graph_name);
-               die_errno(_("unable to create leading directories of %s"),
-                         graph_name);
+static int write_commit_graph_file(struct write_commit_graph_context *ctx)
+{
+       uint32_t i;
+       struct hashfile *f;
+       struct lock_file lk = LOCK_INIT;
+       uint32_t chunk_ids[5];
+       uint64_t chunk_offsets[5];
+       const unsigned hashsz = the_hash_algo->rawsz;
+       struct strbuf progress_title = STRBUF_INIT;
+       int num_chunks = ctx->num_extra_edges ? 4 : 3;
+
+       ctx->graph_name = get_commit_graph_filename(ctx->obj_dir);
+       if (safe_create_leading_directories(ctx->graph_name)) {
+               UNLEAK(ctx->graph_name);
+               error(_("unable to create leading directories of %s"),
+                       ctx->graph_name);
+               return -1;
        }
 
-       hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR);
+       hold_lock_file_for_update(&lk, ctx->graph_name, LOCK_DIE_ON_ERROR);
        f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
 
        hashwrite_be32(f, GRAPH_SIGNATURE);
@@ -1071,7 +1054,7 @@ void write_commit_graph(const char *obj_dir,
        chunk_ids[0] = GRAPH_CHUNKID_OIDFANOUT;
        chunk_ids[1] = GRAPH_CHUNKID_OIDLOOKUP;
        chunk_ids[2] = GRAPH_CHUNKID_DATA;
-       if (num_extra_edges)
+       if (ctx->num_extra_edges)
                chunk_ids[3] = GRAPH_CHUNKID_EXTRAEDGES;
        else
                chunk_ids[3] = 0;
@@ -1079,9 +1062,9 @@ void write_commit_graph(const char *obj_dir,
 
        chunk_offsets[0] = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
        chunk_offsets[1] = chunk_offsets[0] + GRAPH_FANOUT_SIZE;
-       chunk_offsets[2] = chunk_offsets[1] + hashsz * commits.nr;
-       chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * commits.nr;
-       chunk_offsets[4] = chunk_offsets[3] + 4 * num_extra_edges;
+       chunk_offsets[2] = chunk_offsets[1] + hashsz * ctx->commits.nr;
+       chunk_offsets[3] = chunk_offsets[2] + (hashsz + 16) * ctx->commits.nr;
+       chunk_offsets[4] = chunk_offsets[3] + 4 * ctx->num_extra_edges;
 
        for (i = 0; i <= num_chunks; i++) {
                uint32_t chunk_write[3];
@@ -1092,31 +1075,113 @@ void write_commit_graph(const char *obj_dir,
                hashwrite(f, chunk_write, 12);
        }
 
-       if (report_progress) {
+       if (ctx->report_progress) {
                strbuf_addf(&progress_title,
                            Q_("Writing out commit graph in %d pass",
                               "Writing out commit graph in %d passes",
                               num_chunks),
                            num_chunks);
-               progress = start_delayed_progress(
+               ctx->progress = start_delayed_progress(
                        progress_title.buf,
-                       num_chunks * commits.nr);
+                       num_chunks * ctx->commits.nr);
        }
-       write_graph_chunk_fanout(f, commits.list, commits.nr, progress, &progress_cnt);
-       write_graph_chunk_oids(f, hashsz, commits.list, commits.nr, progress, &progress_cnt);
-       write_graph_chunk_data(f, hashsz, commits.list, commits.nr, progress, &progress_cnt);
-       if (num_extra_edges)
-               write_graph_chunk_extra_edges(f, commits.list, commits.nr, progress, &progress_cnt);
-       stop_progress(&progress);
+       write_graph_chunk_fanout(f, ctx);
+       write_graph_chunk_oids(f, hashsz, ctx);
+       write_graph_chunk_data(f, hashsz, ctx);
+       if (ctx->num_extra_edges)
+               write_graph_chunk_extra_edges(f, ctx);
+       stop_progress(&ctx->progress);
        strbuf_release(&progress_title);
 
-       close_commit_graph(the_repository);
+       close_commit_graph(ctx->r->objects);
        finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
        commit_lock_file(&lk);
 
-       free(graph_name);
-       free(commits.list);
-       free(oids.list);
+       return 0;
+}
+
+int write_commit_graph(const char *obj_dir,
+                      struct string_list *pack_indexes,
+                      struct string_list *commit_hex,
+                      unsigned int flags)
+{
+       struct write_commit_graph_context *ctx;
+       uint32_t i, count_distinct = 0;
+       int res = 0;
+
+       if (!commit_graph_compatible(the_repository))
+               return 0;
+
+       ctx = xcalloc(1, sizeof(struct write_commit_graph_context));
+       ctx->r = the_repository;
+       ctx->obj_dir = obj_dir;
+       ctx->append = flags & COMMIT_GRAPH_APPEND ? 1 : 0;
+       ctx->report_progress = flags & COMMIT_GRAPH_PROGRESS ? 1 : 0;
+
+       ctx->approx_nr_objects = approximate_object_count();
+       ctx->oids.alloc = ctx->approx_nr_objects / 32;
+
+       if (ctx->append) {
+               prepare_commit_graph_one(ctx->r, ctx->obj_dir);
+               if (ctx->r->objects->commit_graph)
+                       ctx->oids.alloc += ctx->r->objects->commit_graph->num_commits;
+       }
+
+       if (ctx->oids.alloc < 1024)
+               ctx->oids.alloc = 1024;
+       ALLOC_ARRAY(ctx->oids.list, ctx->oids.alloc);
+
+       if (ctx->append && ctx->r->objects->commit_graph) {
+               struct commit_graph *g = ctx->r->objects->commit_graph;
+               for (i = 0; i < g->num_commits; i++) {
+                       const unsigned char *hash = g->chunk_oid_lookup + g->hash_len * i;
+                       hashcpy(ctx->oids.list[ctx->oids.nr++].hash, hash);
+               }
+       }
+
+       if (pack_indexes) {
+               if ((res = fill_oids_from_packs(ctx, pack_indexes)))
+                       goto cleanup;
+       }
+
+       if (commit_hex)
+               fill_oids_from_commit_hex(ctx, commit_hex);
+
+       if (!pack_indexes && !commit_hex)
+               fill_oids_from_all_packs(ctx);
+
+       close_reachable(ctx);
+
+       count_distinct = count_distinct_commits(ctx);
+
+       if (count_distinct >= GRAPH_EDGE_LAST_MASK) {
+               error(_("the commit graph format cannot write %d commits"), count_distinct);
+               res = -1;
+               goto cleanup;
+       }
+
+       ctx->commits.alloc = count_distinct;
+       ALLOC_ARRAY(ctx->commits.list, ctx->commits.alloc);
+
+       copy_oids_to_commits(ctx);
+
+       if (ctx->commits.nr >= GRAPH_EDGE_LAST_MASK) {
+               error(_("too many commits to write graph"));
+               res = -1;
+               goto cleanup;
+       }
+
+       compute_generation_numbers(ctx);
+
+       res = write_commit_graph_file(ctx);
+
+cleanup:
+       free(ctx->graph_name);
+       free(ctx->commits.list);
+       free(ctx->oids.list);
+       free(ctx);
+
+       return res;
 }
 
 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
@@ -1214,7 +1279,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
                hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
 
                graph_commit = lookup_commit(r, &cur_oid);
-               odb_commit = (struct commit *)create_object(r, cur_oid.hash, alloc_commit_node(r));
+               odb_commit = (struct commit *)create_object(r, &cur_oid, alloc_commit_node(r));
                if (parse_commit_internal(odb_commit, 0, 0)) {
                        graph_report(_("failed to parse commit %s from object database for commit-graph"),
                                     oid_to_hex(&cur_oid));