Merge branch 'bc/sha-256'
[git/git.git] / commit-graph.c
index 7a28fbb..3f9c03a 100644 (file)
@@ -13,6 +13,9 @@
 #include "commit-graph.h"
 #include "object-store.h"
 #include "alloc.h"
+#include "hashmap.h"
+#include "replace-object.h"
+#include "progress.h"
 
 #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
 #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
@@ -26,7 +29,6 @@
 #define GRAPH_VERSION GRAPH_VERSION_1
 
 #define GRAPH_OCTOPUS_EDGES_NEEDED 0x80000000
-#define GRAPH_PARENT_MISSING 0x7fffffff
 #define GRAPH_EDGE_LAST_MASK 0x7fffffff
 #define GRAPH_PARENT_NONE 0x70000000
 
@@ -56,6 +58,28 @@ static struct commit_graph *alloc_commit_graph(void)
        return g;
 }
 
+extern int read_replace_refs;
+
+static int commit_graph_compatible(struct repository *r)
+{
+       if (!r->gitdir)
+               return 0;
+
+       if (read_replace_refs) {
+               prepare_replace_object(r);
+               if (hashmap_get_size(&r->objects->replace_map->map))
+                       return 0;
+       }
+
+       prepare_commit_graft(r);
+       if (r->parsed_objects && r->parsed_objects->grafts_nr)
+               return 0;
+       if (is_repository_shallow(r))
+               return 0;
+
+       return 1;
+}
+
 struct commit_graph *load_commit_graph_one(const char *graph_file)
 {
        void *graph_map;
@@ -205,8 +229,7 @@ static void prepare_commit_graph_one(struct repository *r, const char *obj_dir)
  */
 static int prepare_commit_graph(struct repository *r)
 {
-       struct alternate_object_database *alt;
-       char *obj_dir;
+       struct object_directory *odb;
        int config_value;
 
        if (r->objects->commit_graph_attempted)
@@ -224,13 +247,14 @@ static int prepare_commit_graph(struct repository *r)
                 */
                return 0;
 
-       obj_dir = r->objects->objectdir;
-       prepare_commit_graph_one(r, obj_dir);
+       if (!commit_graph_compatible(r))
+               return 0;
+
        prepare_alt_odb(r);
-       for (alt = r->objects->alt_odb_list;
-            !r->objects->commit_graph && alt;
-            alt = alt->next)
-               prepare_commit_graph_one(r, alt->path);
+       for (odb = r->objects->odb;
+            !r->objects->commit_graph && odb;
+            odb = odb->next)
+               prepare_commit_graph_one(r, odb->path);
        return !!r->objects->commit_graph;
 }
 
@@ -252,10 +276,10 @@ int generation_numbers_enabled(struct repository *r)
        return !!first_generation;
 }
 
-static void close_commit_graph(void)
+void close_commit_graph(struct repository *r)
 {
-       free_commit_graph(the_repository->objects->commit_graph);
-       the_repository->objects->commit_graph = NULL;
+       free_commit_graph(r->objects->commit_graph);
+       r->objects->commit_graph = NULL;
 }
 
 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
@@ -468,7 +492,9 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
                                              commit_to_sha1);
 
                        if (edge_value < 0)
-                               edge_value = GRAPH_PARENT_MISSING;
+                               BUG("missing parent %s for commit %s",
+                                   oid_to_hex(&parent->item->object.oid),
+                                   oid_to_hex(&(*list)->object.oid));
                }
 
                hashwrite_be32(f, edge_value);
@@ -486,7 +512,9 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
                                              nr_commits,
                                              commit_to_sha1);
                        if (edge_value < 0)
-                               edge_value = GRAPH_PARENT_MISSING;
+                               BUG("missing parent %s for commit %s",
+                                   oid_to_hex(&parent->item->object.oid),
+                                   oid_to_hex(&(*list)->object.oid));
                }
 
                hashwrite_be32(f, edge_value);
@@ -539,7 +567,9 @@ static void write_graph_chunk_large_edges(struct hashfile *f,
                                                  commit_to_sha1);
 
                        if (edge_value < 0)
-                               edge_value = GRAPH_PARENT_MISSING;
+                               BUG("missing parent %s for commit %s",
+                                   oid_to_hex(&parent->item->object.oid),
+                                   oid_to_hex(&(*list)->object.oid));
                        else if (!parent->next)
                                edge_value |= GRAPH_LAST_EDGE;
 
@@ -567,6 +597,8 @@ 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,
@@ -579,6 +611,9 @@ static int add_packed_commits(const struct object_id *oid,
        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);
+
        oi.typep = &type;
        if (packed_object_info(the_repository, pack, offset, &oi) < 0)
                die(_("unable to get type of object %s"), oid_to_hex(oid));
@@ -606,43 +641,66 @@ static void add_missing_parents(struct packed_oid_list *oids, struct commit *com
        }
 }
 
-static void close_reachable(struct packed_oid_list *oids)
+static void close_reachable(struct packed_oid_list *oids, int report_progress)
 {
-       int i;
+       int i, j;
        struct commit *commit;
+       struct progress *progress = NULL;
 
+       if (report_progress)
+               progress = start_delayed_progress(
+                       _("Loading known commits in commit graph"), j = 0);
        for (i = 0; i < oids->nr; i++) {
+               display_progress(progress, ++j);
                commit = lookup_commit(the_repository, &oids->list[i]);
                if (commit)
                        commit->object.flags |= UNINTERESTING;
        }
+       stop_progress(&progress);
 
        /*
         * As this loop runs, 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"), j = 0);
        for (i = 0; i < oids->nr; i++) {
+               display_progress(progress, ++j);
                commit = lookup_commit(the_repository, &oids->list[i]);
 
                if (commit && !parse_commit(commit))
                        add_missing_parents(oids, commit);
        }
+       stop_progress(&progress);
 
+       if (report_progress)
+               progress = start_delayed_progress(
+                       _("Clearing commit marks in commit graph"), j = 0);
        for (i = 0; i < oids->nr; i++) {
+               display_progress(progress, ++j);
                commit = lookup_commit(the_repository, &oids->list[i]);
 
                if (commit)
                        commit->object.flags &= ~UNINTERESTING;
        }
+       stop_progress(&progress);
 }
 
-static void compute_generation_numbers(struct packed_commit_list* commits)
+static void compute_generation_numbers(struct packed_commit_list* commits,
+                                      int report_progress)
 {
        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)
                        continue;
@@ -674,6 +732,7 @@ static void compute_generation_numbers(struct packed_commit_list* commits)
                        }
                }
        }
+       stop_progress(&progress);
 }
 
 static int add_ref_to_list(const char *refname,
@@ -686,19 +745,21 @@ static int add_ref_to_list(const char *refname,
        return 0;
 }
 
-void write_commit_graph_reachable(const char *obj_dir, int append)
+void write_commit_graph_reachable(const char *obj_dir, int append,
+                                 int report_progress)
 {
-       struct string_list list;
+       struct string_list list = STRING_LIST_INIT_DUP;
 
-       string_list_init(&list, 1);
        for_each_ref(add_ref_to_list, &list);
-       write_commit_graph(obj_dir, NULL, &list, append);
+       write_commit_graph(obj_dir, NULL, &list, append, report_progress);
+
+       string_list_clear(&list, 0);
 }
 
 void write_commit_graph(const char *obj_dir,
                        struct string_list *pack_indexes,
                        struct string_list *commit_hex,
-                       int append)
+                       int append, int report_progress)
 {
        struct packed_oid_list oids;
        struct packed_commit_list commits;
@@ -711,10 +772,16 @@ void write_commit_graph(const char *obj_dir,
        int num_chunks;
        int num_extra_edges;
        struct commit_list *parent;
+       struct progress *progress = NULL;
        const unsigned hashsz = the_hash_algo->rawsz;
 
+       if (!commit_graph_compatible(the_repository))
+               return;
+
        oids.nr = 0;
-       oids.alloc = approximate_object_count() / 4;
+       oids.alloc = approximate_object_count() / 32;
+       oids.progress = NULL;
+       oids.progress_done = 0;
 
        if (append) {
                prepare_commit_graph_one(the_repository, obj_dir);
@@ -741,6 +808,11 @@ void write_commit_graph(const char *obj_dir,
                int dirlen;
                strbuf_addf(&packname, "%s/pack/", obj_dir);
                dirlen = packname.len;
+               if (report_progress) {
+                       oids.progress = start_delayed_progress(
+                               _("Finding commits for commit graph"), 0);
+                       oids.progress_done = 0;
+               }
                for (i = 0; i < pack_indexes->nr; i++) {
                        struct packed_git *p;
                        strbuf_setlen(&packname, dirlen);
@@ -752,16 +824,23 @@ void write_commit_graph(const char *obj_dir,
                                die(_("error opening index for %s"), packname.buf);
                        for_each_object_in_pack(p, add_packed_commits, &oids, 0);
                        close_pack(p);
+                       free(p);
                }
+               stop_progress(&oids.progress);
                strbuf_release(&packname);
        }
 
        if (commit_hex) {
+               if (report_progress)
+                       progress = start_delayed_progress(
+                               _("Finding commits for commit graph"),
+                               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;
@@ -774,12 +853,18 @@ void write_commit_graph(const char *obj_dir,
                                oids.nr++;
                        }
                }
+               stop_progress(&progress);
        }
 
-       if (!pack_indexes && !commit_hex)
+       if (!pack_indexes && !commit_hex) {
+               if (report_progress)
+                       oids.progress = start_delayed_progress(
+                               _("Finding commits for commit graph"), 0);
                for_each_packed_object(add_packed_commits, &oids, 0);
+               stop_progress(&oids.progress);
+       }
 
-       close_reachable(&oids);
+       close_reachable(&oids, report_progress);
 
        QSORT(oids.list, oids.nr, commit_compare);
 
@@ -789,7 +874,7 @@ void write_commit_graph(const char *obj_dir,
                        count_distinct++;
        }
 
-       if (count_distinct >= GRAPH_PARENT_MISSING)
+       if (count_distinct >= GRAPH_EDGE_LAST_MASK)
                die(_("the commit graph format cannot write %d commits"), count_distinct);
 
        commits.nr = 0;
@@ -816,15 +901,17 @@ void write_commit_graph(const char *obj_dir,
        }
        num_chunks = num_extra_edges ? 4 : 3;
 
-       if (commits.nr >= GRAPH_PARENT_MISSING)
+       if (commits.nr >= GRAPH_EDGE_LAST_MASK)
                die(_("too many commits to write graph"));
 
-       compute_generation_numbers(&commits);
+       compute_generation_numbers(&commits, report_progress);
 
        graph_name = get_commit_graph_filename(obj_dir);
-       if (safe_create_leading_directories(graph_name))
+       if (safe_create_leading_directories(graph_name)) {
+               UNLEAK(graph_name);
                die_errno(_("unable to create leading directories of %s"),
                          graph_name);
+       }
 
        hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR);
        f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
@@ -865,13 +952,13 @@ void write_commit_graph(const char *obj_dir,
        write_graph_chunk_data(f, hashsz, commits.list, commits.nr);
        write_graph_chunk_large_edges(f, commits.list, commits.nr);
 
-       close_commit_graph();
+       close_commit_graph(the_repository);
        finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
        commit_lock_file(&lk);
 
+       free(graph_name);
+       free(commits.list);
        free(oids.list);
-       oids.alloc = 0;
-       oids.nr = 0;
 }
 
 #define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
@@ -898,6 +985,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
        int generation_zero = 0;
        struct hashfile *f;
        int devnull;
+       struct progress *progress = NULL;
 
        if (!g) {
                graph_report("no commit-graph file loaded");
@@ -965,11 +1053,14 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
        if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
                return verify_commit_graph_error;
 
+       progress = start_progress(_("Verifying commits in commit graph"),
+                                 g->num_commits);
        for (i = 0; i < g->num_commits; i++) {
                struct commit *graph_commit, *odb_commit;
                struct commit_list *graph_parents, *odb_parents;
                uint32_t max_generation = 0;
 
+               display_progress(progress, i + 1);
                hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
 
                graph_commit = lookup_commit(r, &cur_oid);
@@ -1046,6 +1137,7 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g)
                                     graph_commit->date,
                                     odb_commit->date);
        }
+       stop_progress(&progress);
 
        return verify_commit_graph_error;
 }