Merge branch 'ag/sequencer-reduce-rewriting-todo' into pw/rebase-i-internal
[gitweb.git] / upload-pack.c
index 2ae9d9bb475214070529e22cc3f186afebbc6c7c..d098ef598289d16956309cb73d4518a92c1206af 100644 (file)
 #include "upload-pack.h"
 #include "serve.h"
 #include "commit-graph.h"
+#include "commit-reach.h"
 
 /* Remember to update object flag allocation in object.h */
 #define THEY_HAVE      (1u << 11)
 #define OUR_REF                (1u << 12)
 #define WANTED         (1u << 13)
 #define COMMON_KNOWN   (1u << 14)
-#define REACHABLE      (1u << 15)
 
 #define SHALLOW                (1u << 16)
 #define NOT_SHALLOW    (1u << 17)
 #define CLIENT_SHALLOW (1u << 18)
 #define HIDDEN_REF     (1u << 19)
 
+#define ALL_FLAGS (THEY_HAVE | OUR_REF | WANTED | COMMON_KNOWN | SHALLOW | \
+               NOT_SHALLOW | CLIENT_SHALLOW | HIDDEN_REF)
+
 static timestamp_t oldest_have;
 
-static int deepen_relative;
 static int multi_ack;
 static int no_done;
 static int use_thin_pack, use_ofs_delta, use_include_tag;
@@ -53,8 +55,6 @@ static int no_progress, daemon_mode;
 #define ALLOW_ANY_SHA1 07
 static unsigned int allow_unadvertised_object_request;
 static int shallow_nr;
-static struct object_array have_obj;
-static struct object_array want_obj;
 static struct object_array extra_edge_obj;
 static unsigned int timeout;
 static int keepalive = 5;
@@ -70,6 +70,8 @@ static int allow_filter;
 static int allow_ref_in_want;
 static struct list_objects_filter_options filter_options;
 
+static int allow_sideband_all;
+
 static void reset_timeout(void)
 {
        alarm(timeout);
@@ -100,7 +102,8 @@ static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
        return 0;
 }
 
-static void create_pack_file(void)
+static void create_pack_file(const struct object_array *have_obj,
+                            const struct object_array *want_obj)
 {
        struct child_process pack_objects = CHILD_PROCESS_INIT;
        char data[8193], progress[128];
@@ -138,14 +141,17 @@ static void create_pack_file(void)
        if (use_include_tag)
                argv_array_push(&pack_objects.args, "--include-tag");
        if (filter_options.filter_spec) {
+               struct strbuf expanded_filter_spec = STRBUF_INIT;
+               expand_list_objects_filter_spec(&filter_options,
+                                               &expanded_filter_spec);
                if (pack_objects.use_shell) {
                        struct strbuf buf = STRBUF_INIT;
-                       sq_quote_buf(&buf, filter_options.filter_spec);
+                       sq_quote_buf(&buf, expanded_filter_spec.buf);
                        argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
                        strbuf_release(&buf);
                } else {
                        argv_array_pushf(&pack_objects.args, "--filter=%s",
-                                        filter_options.filter_spec);
+                                        expanded_filter_spec.buf);
                }
        }
 
@@ -161,13 +167,13 @@ static void create_pack_file(void)
        if (shallow_nr)
                for_each_commit_graft(write_one_shallow, pipe_fd);
 
-       for (i = 0; i < want_obj.nr; i++)
+       for (i = 0; i < want_obj->nr; i++)
                fprintf(pipe_fd, "%s\n",
-                       oid_to_hex(&want_obj.objects[i].item->oid));
+                       oid_to_hex(&want_obj->objects[i].item->oid));
        fprintf(pipe_fd, "--not\n");
-       for (i = 0; i < have_obj.nr; i++)
+       for (i = 0; i < have_obj->nr; i++)
                fprintf(pipe_fd, "%s\n",
-                       oid_to_hex(&have_obj.objects[i].item->oid));
+                       oid_to_hex(&have_obj->objects[i].item->oid));
        for (i = 0; i < extra_edge_obj.nr; i++)
                fprintf(pipe_fd, "%s\n",
                        oid_to_hex(&extra_edge_obj.objects[i].item->oid));
@@ -304,7 +310,8 @@ static void create_pack_file(void)
        die("git upload-pack: %s", abort_msg);
 }
 
-static int got_oid(const char *hex, struct object_id *oid)
+static int got_oid(const char *hex, struct object_id *oid,
+                  struct object_array *have_obj)
 {
        struct object *o;
        int we_knew_they_have = 0;
@@ -332,73 +339,28 @@ static int got_oid(const char *hex, struct object_id *oid)
                        parents->item->object.flags |= THEY_HAVE;
        }
        if (!we_knew_they_have) {
-               add_object_array(o, NULL, &have_obj);
+               add_object_array(o, NULL, have_obj);
                return 1;
        }
        return 0;
 }
 
-static int reachable(struct commit *want)
-{
-       struct prio_queue work = { compare_commits_by_commit_date };
-
-       prio_queue_put(&work, want);
-       while (work.nr) {
-               struct commit_list *list;
-               struct commit *commit = prio_queue_get(&work);
-
-               if (commit->object.flags & THEY_HAVE) {
-                       want->object.flags |= COMMON_KNOWN;
-                       break;
-               }
-               if (!commit->object.parsed)
-                       parse_object(the_repository, &commit->object.oid);
-               if (commit->object.flags & REACHABLE)
-                       continue;
-               commit->object.flags |= REACHABLE;
-               if (commit->date < oldest_have)
-                       continue;
-               for (list = commit->parents; list; list = list->next) {
-                       struct commit *parent = list->item;
-                       if (!(parent->object.flags & REACHABLE))
-                               prio_queue_put(&work, parent);
-               }
-       }
-       want->object.flags |= REACHABLE;
-       clear_commit_marks(want, REACHABLE);
-       clear_prio_queue(&work);
-       return (want->object.flags & COMMON_KNOWN);
-}
-
-static int ok_to_give_up(void)
+static int ok_to_give_up(const struct object_array *have_obj,
+                        struct object_array *want_obj)
 {
-       int i;
+       uint32_t min_generation = GENERATION_NUMBER_ZERO;
 
-       if (!have_obj.nr)
+       if (!have_obj->nr)
                return 0;
 
-       for (i = 0; i < want_obj.nr; i++) {
-               struct object *want = want_obj.objects[i].item;
-
-               if (want->flags & COMMON_KNOWN)
-                       continue;
-               want = deref_tag(the_repository, want, "a want line", 0);
-               if (!want || want->type != OBJ_COMMIT) {
-                       /* no way to tell if this is reachable by
-                        * looking at the ancestry chain alone, so
-                        * leave a note to ourselves not to worry about
-                        * this object anymore.
-                        */
-                       want_obj.objects[i].item->flags |= COMMON_KNOWN;
-                       continue;
-               }
-               if (!reachable((struct commit *)want))
-                       return 0;
-       }
-       return 1;
+       return can_all_from_reach_with_flag(want_obj, THEY_HAVE,
+                                           COMMON_KNOWN, oldest_have,
+                                           min_generation);
 }
 
-static int get_common_commits(void)
+static int get_common_commits(struct packet_reader *reader,
+                             struct object_array *have_obj,
+                             struct object_array *want_obj)
 {
        struct object_id oid;
        char last_hex[GIT_MAX_HEXSZ + 1];
@@ -409,18 +371,17 @@ static int get_common_commits(void)
        save_commit_buffer = 0;
 
        for (;;) {
-               char *line = packet_read_line(0, NULL);
                const char *arg;
 
                reset_timeout();
 
-               if (!line) {
+               if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
                        if (multi_ack == 2 && got_common
-                           && !got_other && ok_to_give_up()) {
+                           && !got_other && ok_to_give_up(have_obj, want_obj)) {
                                sent_ready = 1;
                                packet_write_fmt(1, "ACK %s ready\n", last_hex);
                        }
-                       if (have_obj.nr == 0 || multi_ack)
+                       if (have_obj->nr == 0 || multi_ack)
                                packet_write_fmt(1, "NAK\n");
 
                        if (no_done && sent_ready) {
@@ -433,11 +394,11 @@ static int get_common_commits(void)
                        got_other = 0;
                        continue;
                }
-               if (skip_prefix(line, "have ", &arg)) {
-                       switch (got_oid(arg, &oid)) {
+               if (skip_prefix(reader->line, "have ", &arg)) {
+                       switch (got_oid(arg, &oid, have_obj)) {
                        case -1: /* they have what we do not */
                                got_other = 1;
-                               if (multi_ack && ok_to_give_up()) {
+                               if (multi_ack && ok_to_give_up(have_obj, want_obj)) {
                                        const char *hex = oid_to_hex(&oid);
                                        if (multi_ack == 2) {
                                                sent_ready = 1;
@@ -453,14 +414,14 @@ static int get_common_commits(void)
                                        packet_write_fmt(1, "ACK %s common\n", last_hex);
                                else if (multi_ack)
                                        packet_write_fmt(1, "ACK %s continue\n", last_hex);
-                               else if (have_obj.nr == 1)
+                               else if (have_obj->nr == 1)
                                        packet_write_fmt(1, "ACK %s\n", last_hex);
                                break;
                        }
                        continue;
                }
-               if (!strcmp(line, "done")) {
-                       if (have_obj.nr > 0) {
+               if (!strcmp(reader->line, "done")) {
+                       if (have_obj->nr > 0) {
                                if (multi_ack)
                                        packet_write_fmt(1, "ACK %s\n", last_hex);
                                return 0;
@@ -468,7 +429,7 @@ static int get_common_commits(void)
                        packet_write_fmt(1, "NAK\n");
                        return -1;
                }
-               die("git upload-pack: expected SHA1 list, got '%s'", line);
+               die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
        }
 }
 
@@ -492,6 +453,7 @@ static int do_reachable_revlist(struct child_process *cmd,
        struct object *o;
        char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
        int i;
+       const unsigned hexsz = the_hash_algo->hexsz;
 
        cmd->argv = argv;
        cmd->git_cmd = 1;
@@ -510,7 +472,7 @@ static int do_reachable_revlist(struct child_process *cmd,
                goto error;
 
        namebuf[0] = '^';
-       namebuf[GIT_SHA1_HEXSZ + 1] = '\n';
+       namebuf[hexsz + 1] = '\n';
        for (i = get_max_object_index(); 0 < i; ) {
                o = get_indexed_object(--i);
                if (!o)
@@ -519,11 +481,11 @@ static int do_reachable_revlist(struct child_process *cmd,
                        o->flags &= ~TMP_MARK;
                if (!is_our_ref(o))
                        continue;
-               memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
-               if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 2) < 0)
+               memcpy(namebuf + 1, oid_to_hex(&o->oid), hexsz);
+               if (write_in_full(cmd->in, namebuf, hexsz + 2) < 0)
                        goto error;
        }
-       namebuf[GIT_SHA1_HEXSZ] = '\n';
+       namebuf[hexsz] = '\n';
        for (i = 0; i < src->nr; i++) {
                o = src->objects[i].item;
                if (is_our_ref(o)) {
@@ -533,8 +495,8 @@ static int do_reachable_revlist(struct child_process *cmd,
                }
                if (reachable && o->type == OBJ_COMMIT)
                        o->flags |= TMP_MARK;
-               memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
-               if (write_in_full(cmd->in, namebuf, GIT_SHA1_HEXSZ + 1) < 0)
+               memcpy(namebuf, oid_to_hex(&o->oid), hexsz);
+               if (write_in_full(cmd->in, namebuf, hexsz + 1) < 0)
                        goto error;
        }
        close(cmd->in);
@@ -630,7 +592,7 @@ static int has_unreachable(struct object_array *src)
        return 1;
 }
 
-static void check_non_tip(void)
+static void check_non_tip(struct object_array *want_obj)
 {
        int i;
 
@@ -641,27 +603,28 @@ static void check_non_tip(void)
         */
        if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
                goto error;
-       if (!has_unreachable(&want_obj))
+       if (!has_unreachable(want_obj))
                /* All the non-tip ones are ancestors of what we advertised */
                return;
 
 error:
        /* Pick one of them (we know there at least is one) */
-       for (i = 0; i < want_obj.nr; i++) {
-               struct object *o = want_obj.objects[i].item;
+       for (i = 0; i < want_obj->nr; i++) {
+               struct object *o = want_obj->objects[i].item;
                if (!is_our_ref(o))
                        die("git upload-pack: not our ref %s",
                            oid_to_hex(&o->oid));
        }
 }
 
-static void send_shallow(struct commit_list *result)
+static void send_shallow(struct packet_writer *writer,
+                        struct commit_list *result)
 {
        while (result) {
                struct object *object = &result->item->object;
                if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
-                       packet_write_fmt(1, "shallow %s",
-                                        oid_to_hex(&object->oid));
+                       packet_writer_write(writer, "shallow %s",
+                                           oid_to_hex(&object->oid));
                        register_shallow(the_repository, &object->oid);
                        shallow_nr++;
                }
@@ -669,7 +632,9 @@ static void send_shallow(struct commit_list *result)
        }
 }
 
-static void send_unshallow(const struct object_array *shallows)
+static void send_unshallow(struct packet_writer *writer,
+                          const struct object_array *shallows,
+                          struct object_array *want_obj)
 {
        int i;
 
@@ -677,8 +642,8 @@ static void send_unshallow(const struct object_array *shallows)
                struct object *object = shallows->objects[i].item;
                if (object->flags & NOT_SHALLOW) {
                        struct commit_list *parents;
-                       packet_write_fmt(1, "unshallow %s",
-                                        oid_to_hex(&object->oid));
+                       packet_writer_write(writer, "unshallow %s",
+                                           oid_to_hex(&object->oid));
                        object->flags &= ~CLIENT_SHALLOW;
                        /*
                         * We want to _register_ "object" as shallow, but we
@@ -693,7 +658,7 @@ static void send_unshallow(const struct object_array *shallows)
                        parents = ((struct commit *)object)->parents;
                        while (parents) {
                                add_object_array(&parents->item->object,
-                                                NULL, &want_obj);
+                                                NULL, want_obj);
                                parents = parents->next;
                        }
                        add_object_array(object, NULL, &extra_edge_obj);
@@ -703,8 +668,10 @@ static void send_unshallow(const struct object_array *shallows)
        }
 }
 
-static void deepen(int depth, int deepen_relative,
-                  struct object_array *shallows)
+static int check_ref(const char *refname_full, const struct object_id *oid,
+                    int flag, void *cb_data);
+static void deepen(struct packet_writer *writer, int depth, int deepen_relative,
+                  struct object_array *shallows, struct object_array *want_obj)
 {
        if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
                int i;
@@ -717,49 +684,61 @@ static void deepen(int depth, int deepen_relative,
                struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
                struct commit_list *result;
 
+               /*
+                * Checking for reachable shallows requires that our refs be
+                * marked with OUR_REF.
+                */
+               head_ref_namespaced(check_ref, NULL);
+               for_each_namespaced_ref(check_ref, NULL);
+
                get_reachable_list(shallows, &reachable_shallows);
                result = get_shallow_commits(&reachable_shallows,
                                             depth + 1,
                                             SHALLOW, NOT_SHALLOW);
-               send_shallow(result);
+               send_shallow(writer, result);
                free_commit_list(result);
                object_array_clear(&reachable_shallows);
        } else {
                struct commit_list *result;
 
-               result = get_shallow_commits(&want_obj, depth,
+               result = get_shallow_commits(want_obj, depth,
                                             SHALLOW, NOT_SHALLOW);
-               send_shallow(result);
+               send_shallow(writer, result);
                free_commit_list(result);
        }
 
-       send_unshallow(shallows);
+       send_unshallow(writer, shallows, want_obj);
 }
 
-static void deepen_by_rev_list(int ac, const char **av,
-                              struct object_array *shallows)
+static void deepen_by_rev_list(struct packet_writer *writer, int ac,
+                              const char **av,
+                              struct object_array *shallows,
+                              struct object_array *want_obj)
 {
        struct commit_list *result;
 
        close_commit_graph(the_repository);
        result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
-       send_shallow(result);
+       send_shallow(writer, result);
        free_commit_list(result);
-       send_unshallow(shallows);
+       send_unshallow(writer, shallows, want_obj);
 }
 
 /* Returns 1 if a shallow list is sent or 0 otherwise */
-static int send_shallow_list(int depth, int deepen_rev_list,
+static int send_shallow_list(struct packet_writer *writer,
+                            int depth, int deepen_rev_list,
                             timestamp_t deepen_since,
                             struct string_list *deepen_not,
-                            struct object_array *shallows)
+                            int deepen_relative,
+                            struct object_array *shallows,
+                            struct object_array *want_obj)
 {
        int ret = 0;
 
        if (depth > 0 && deepen_rev_list)
                die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
        if (depth > 0) {
-               deepen(depth, deepen_relative, shallows);
+               deepen(writer, depth, deepen_relative, shallows, want_obj);
                ret = 1;
        } else if (deepen_rev_list) {
                struct argv_array av = ARGV_ARRAY_INIT;
@@ -776,11 +755,11 @@ static int send_shallow_list(int depth, int deepen_rev_list,
                        }
                        argv_array_push(&av, "--not");
                }
-               for (i = 0; i < want_obj.nr; i++) {
-                       struct object *o = want_obj.objects[i].item;
+               for (i = 0; i < want_obj->nr; i++) {
+                       struct object *o = want_obj->objects[i].item;
                        argv_array_push(&av, oid_to_hex(&o->oid));
                }
-               deepen_by_rev_list(av.argc, av.argv, shallows);
+               deepen_by_rev_list(writer, av.argc, av.argv, shallows, want_obj);
                argv_array_clear(&av);
                ret = 1;
        } else {
@@ -865,7 +844,7 @@ static int process_deepen_not(const char *line, struct string_list *deepen_not,
        return 0;
 }
 
-static void receive_needs(void)
+static void receive_needs(struct packet_reader *reader, struct object_array *want_obj)
 {
        struct object_array shallows = OBJECT_ARRAY_INIT;
        struct string_list deepen_not = STRING_LIST_INIT_DUP;
@@ -873,39 +852,41 @@ static void receive_needs(void)
        int has_non_tip = 0;
        timestamp_t deepen_since = 0;
        int deepen_rev_list = 0;
+       int deepen_relative = 0;
+       struct packet_writer writer;
 
        shallow_nr = 0;
+       packet_writer_init(&writer, 1);
        for (;;) {
                struct object *o;
                const char *features;
                struct object_id oid_buf;
-               char *line = packet_read_line(0, NULL);
                const char *arg;
 
                reset_timeout();
-               if (!line)
+               if (packet_reader_read(reader) != PACKET_READ_NORMAL)
                        break;
 
-               if (process_shallow(line, &shallows))
+               if (process_shallow(reader->line, &shallows))
                        continue;
-               if (process_deepen(line, &depth))
+               if (process_deepen(reader->line, &depth))
                        continue;
-               if (process_deepen_since(line, &deepen_since, &deepen_rev_list))
+               if (process_deepen_since(reader->line, &deepen_since, &deepen_rev_list))
                        continue;
-               if (process_deepen_not(line, &deepen_not, &deepen_rev_list))
+               if (process_deepen_not(reader->line, &deepen_not, &deepen_rev_list))
                        continue;
 
-               if (skip_prefix(line, "filter ", &arg)) {
+               if (skip_prefix(reader->line, "filter ", &arg)) {
                        if (!filter_capability_requested)
                                die("git upload-pack: filtering capability not negotiated");
                        parse_list_objects_filter(&filter_options, arg);
                        continue;
                }
 
-               if (!skip_prefix(line, "want ", &arg) ||
+               if (!skip_prefix(reader->line, "want ", &arg) ||
                    parse_oid_hex(arg, &oid_buf, &features))
                        die("git upload-pack: protocol error, "
-                           "expected to get object ID, not '%s'", line);
+                           "expected to get object ID, not '%s'", reader->line);
 
                if (parse_feature_request(features, "deepen-relative"))
                        deepen_relative = 1;
@@ -932,9 +913,9 @@ static void receive_needs(void)
 
                o = parse_object(the_repository, &oid_buf);
                if (!o) {
-                       packet_write_fmt(1,
-                                        "ERR upload-pack: not our ref %s",
-                                        oid_to_hex(&oid_buf));
+                       packet_writer_error(&writer,
+                                           "upload-pack: not our ref %s",
+                                           oid_to_hex(&oid_buf));
                        die("git upload-pack: not our ref %s",
                            oid_to_hex(&oid_buf));
                }
@@ -943,7 +924,7 @@ static void receive_needs(void)
                        if (!((allow_unadvertised_object_request & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
                              || is_our_ref(o)))
                                has_non_tip = 1;
-                       add_object_array(o, NULL, &want_obj);
+                       add_object_array(o, NULL, want_obj);
                }
        }
 
@@ -955,7 +936,7 @@ static void receive_needs(void)
         * by another process that handled the initial request.
         */
        if (has_non_tip)
-               check_non_tip();
+               check_non_tip(want_obj);
 
        if (!use_sideband && daemon_mode)
                no_progress = 1;
@@ -963,8 +944,9 @@ static void receive_needs(void)
        if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
                return;
 
-       if (send_shallow_list(depth, deepen_rev_list, deepen_since,
-                             &deepen_not, &shallows))
+       if (send_shallow_list(&writer, depth, deepen_rev_list, deepen_since,
+                             &deepen_not, deepen_relative, &shallows,
+                             want_obj))
                packet_flush(1);
        object_array_clear(&shallows);
 }
@@ -1076,20 +1058,27 @@ static int upload_pack_config(const char *var, const char *value, void *unused)
                keepalive = git_config_int(var, value);
                if (!keepalive)
                        keepalive = -1;
-       } else if (current_config_scope() != CONFIG_SCOPE_REPO) {
-               if (!strcmp("uploadpack.packobjectshook", var))
-                       return git_config_string(&pack_objects_hook, var, value);
        } else if (!strcmp("uploadpack.allowfilter", var)) {
                allow_filter = git_config_bool(var, value);
        } else if (!strcmp("uploadpack.allowrefinwant", var)) {
                allow_ref_in_want = git_config_bool(var, value);
+       } else if (!strcmp("uploadpack.allowsidebandall", var)) {
+               allow_sideband_all = git_config_bool(var, value);
+       }
+
+       if (current_config_scope() != CONFIG_SCOPE_REPO) {
+               if (!strcmp("uploadpack.packobjectshook", var))
+                       return git_config_string(&pack_objects_hook, var, value);
        }
+
        return parse_hide_refs_config(var, value, "uploadpack");
 }
 
 void upload_pack(struct upload_pack_options *options)
 {
        struct string_list symref = STRING_LIST_INIT_DUP;
+       struct object_array want_obj = OBJECT_ARRAY_INIT;
+       struct packet_reader reader;
 
        stateless_rpc = options->stateless_rpc;
        timeout = options->timeout;
@@ -1113,10 +1102,15 @@ void upload_pack(struct upload_pack_options *options)
        if (options->advertise_refs)
                return;
 
-       receive_needs();
+       packet_reader_init(&reader, 0, NULL, 0,
+                          PACKET_READ_CHOMP_NEWLINE |
+                          PACKET_READ_DIE_ON_ERR_PACKET);
+
+       receive_needs(&reader, &want_obj);
        if (want_obj.nr) {
-               get_common_commits();
-               create_pack_file();
+               struct object_array have_obj = OBJECT_ARRAY_INIT;
+               get_common_commits(&reader, &have_obj, &want_obj);
+               create_pack_file(&have_obj, &want_obj);
        }
 }
 
@@ -1132,6 +1126,8 @@ struct upload_pack_data {
        int deepen_rev_list;
        int deepen_relative;
 
+       struct packet_writer writer;
+
        unsigned stateless_rpc : 1;
 
        unsigned use_thin_pack : 1;
@@ -1155,6 +1151,7 @@ static void upload_pack_data_init(struct upload_pack_data *data)
        data->haves = haves;
        data->shallows = shallows;
        data->deepen_not = deepen_not;
+       packet_writer_init(&data->writer, 1);
 }
 
 static void upload_pack_data_clear(struct upload_pack_data *data)
@@ -1166,7 +1163,8 @@ static void upload_pack_data_clear(struct upload_pack_data *data)
        string_list_clear(&data->deepen_not, 0);
 }
 
-static int parse_want(const char *line)
+static int parse_want(struct packet_writer *writer, const char *line,
+                     struct object_array *want_obj)
 {
        const char *arg;
        if (skip_prefix(line, "want ", &arg)) {
@@ -1179,16 +1177,16 @@ static int parse_want(const char *line)
 
                o = parse_object(the_repository, &oid);
                if (!o) {
-                       packet_write_fmt(1,
-                                        "ERR upload-pack: not our ref %s",
-                                        oid_to_hex(&oid));
+                       packet_writer_error(writer,
+                                           "upload-pack: not our ref %s",
+                                           oid_to_hex(&oid));
                        die("git upload-pack: not our ref %s",
                            oid_to_hex(&oid));
                }
 
                if (!(o->flags & WANTED)) {
                        o->flags |= WANTED;
-                       add_object_array(o, NULL, &want_obj);
+                       add_object_array(o, NULL, want_obj);
                }
 
                return 1;
@@ -1197,7 +1195,9 @@ static int parse_want(const char *line)
        return 0;
 }
 
-static int parse_want_ref(const char *line, struct string_list *wanted_refs)
+static int parse_want_ref(struct packet_writer *writer, const char *line,
+                         struct string_list *wanted_refs,
+                         struct object_array *want_obj)
 {
        const char *arg;
        if (skip_prefix(line, "want-ref ", &arg)) {
@@ -1206,7 +1206,7 @@ static int parse_want_ref(const char *line, struct string_list *wanted_refs)
                struct object *o;
 
                if (read_ref(arg, &oid)) {
-                       packet_write_fmt(1, "ERR unknown ref %s", arg);
+                       packet_writer_error(writer, "unknown ref %s", arg);
                        die("unknown ref %s", arg);
                }
 
@@ -1216,7 +1216,7 @@ static int parse_want_ref(const char *line, struct string_list *wanted_refs)
                o = parse_object_or_die(&oid, arg);
                if (!(o->flags & WANTED)) {
                        o->flags |= WANTED;
-                       add_object_array(o, NULL, &want_obj);
+                       add_object_array(o, NULL, want_obj);
                }
 
                return 1;
@@ -1241,16 +1241,19 @@ static int parse_have(const char *line, struct oid_array *haves)
 }
 
 static void process_args(struct packet_reader *request,
-                        struct upload_pack_data *data)
+                        struct upload_pack_data *data,
+                        struct object_array *want_obj)
 {
        while (packet_reader_read(request) != PACKET_READ_FLUSH) {
                const char *arg = request->line;
                const char *p;
 
                /* process want */
-               if (parse_want(arg))
+               if (parse_want(&data->writer, arg, want_obj))
                        continue;
-               if (allow_ref_in_want && parse_want_ref(arg, &data->wanted_refs))
+               if (allow_ref_in_want &&
+                   parse_want_ref(&data->writer, arg, &data->wanted_refs,
+                                  want_obj))
                        continue;
                /* process have line */
                if (parse_have(arg, &data->haves))
@@ -1299,12 +1302,20 @@ static void process_args(struct packet_reader *request,
                        continue;
                }
 
+               if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
+                    allow_sideband_all) &&
+                   !strcmp(arg, "sideband-all")) {
+                       data->writer.use_sideband = 1;
+                       continue;
+               }
+
                /* ignore unknown lines maybe? */
                die("unexpected line: '%s'", arg);
        }
 }
 
-static int process_haves(struct oid_array *haves, struct oid_array *common)
+static int process_haves(struct oid_array *haves, struct oid_array *common,
+                        struct object_array *have_obj)
 {
        int i;
 
@@ -1337,58 +1348,57 @@ static int process_haves(struct oid_array *haves, struct oid_array *common)
                                parents->item->object.flags |= THEY_HAVE;
                }
                if (!we_knew_they_have)
-                       add_object_array(o, NULL, &have_obj);
+                       add_object_array(o, NULL, have_obj);
        }
 
        return 0;
 }
 
-static int send_acks(struct oid_array *acks, struct strbuf *response)
+static int send_acks(struct packet_writer *writer, struct oid_array *acks,
+                    const struct object_array *have_obj,
+                    struct object_array *want_obj)
 {
        int i;
 
-       packet_buf_write(response, "acknowledgments\n");
+       packet_writer_write(writer, "acknowledgments\n");
 
        /* Send Acks */
        if (!acks->nr)
-               packet_buf_write(response, "NAK\n");
+               packet_writer_write(writer, "NAK\n");
 
        for (i = 0; i < acks->nr; i++) {
-               packet_buf_write(response, "ACK %s\n",
-                                oid_to_hex(&acks->oid[i]));
+               packet_writer_write(writer, "ACK %s\n",
+                                   oid_to_hex(&acks->oid[i]));
        }
 
-       if (ok_to_give_up()) {
+       if (ok_to_give_up(have_obj, want_obj)) {
                /* Send Ready */
-               packet_buf_write(response, "ready\n");
+               packet_writer_write(writer, "ready\n");
                return 1;
        }
 
        return 0;
 }
 
-static int process_haves_and_send_acks(struct upload_pack_data *data)
+static int process_haves_and_send_acks(struct upload_pack_data *data,
+                                      struct object_array *have_obj,
+                                      struct object_array *want_obj)
 {
        struct oid_array common = OID_ARRAY_INIT;
-       struct strbuf response = STRBUF_INIT;
        int ret = 0;
 
-       process_haves(&data->haves, &common);
+       process_haves(&data->haves, &common, have_obj);
        if (data->done) {
                ret = 1;
-       } else if (send_acks(&common, &response)) {
-               packet_buf_delim(&response);
+       } else if (send_acks(&data->writer, &common, have_obj, want_obj)) {
+               packet_writer_delim(&data->writer);
                ret = 1;
        } else {
                /* Add Flush */
-               packet_buf_flush(&response);
+               packet_writer_flush(&data->writer);
                ret = 0;
        }
 
-       /* Send response */
-       write_or_die(1, response.buf, response.len);
-       strbuf_release(&response);
-
        oid_array_clear(&data->haves);
        oid_array_clear(&common);
        return ret;
@@ -1401,31 +1411,35 @@ static void send_wanted_ref_info(struct upload_pack_data *data)
        if (!data->wanted_refs.nr)
                return;
 
-       packet_write_fmt(1, "wanted-refs\n");
+       packet_writer_write(&data->writer, "wanted-refs\n");
 
        for_each_string_list_item(item, &data->wanted_refs) {
-               packet_write_fmt(1, "%s %s\n",
-                                oid_to_hex(item->util),
-                                item->string);
+               packet_writer_write(&data->writer, "%s %s\n",
+                                   oid_to_hex(item->util),
+                                   item->string);
        }
 
-       packet_delim(1);
+       packet_writer_delim(&data->writer);
 }
 
-static void send_shallow_info(struct upload_pack_data *data)
+static void send_shallow_info(struct upload_pack_data *data,
+                             struct object_array *want_obj)
 {
        /* No shallow info needs to be sent */
        if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
            !is_repository_shallow(the_repository))
                return;
 
-       packet_write_fmt(1, "shallow-info\n");
+       packet_writer_write(&data->writer, "shallow-info\n");
 
-       if (!send_shallow_list(data->depth, data->deepen_rev_list,
+       if (!send_shallow_list(&data->writer, data->depth,
+                              data->deepen_rev_list,
                               data->deepen_since, &data->deepen_not,
-                              &data->shallows) &&
+                              data->deepen_relative,
+                              &data->shallows, want_obj) &&
            is_repository_shallow(the_repository))
-               deepen(INFINITE_DEPTH, data->deepen_relative, &data->shallows);
+               deepen(&data->writer, INFINITE_DEPTH, data->deepen_relative,
+                      &data->shallows, want_obj);
 
        packet_delim(1);
 }
@@ -1442,6 +1456,10 @@ int upload_pack_v2(struct repository *r, struct argv_array *keys,
 {
        enum fetch_state state = FETCH_PROCESS_ARGS;
        struct upload_pack_data data;
+       struct object_array have_obj = OBJECT_ARRAY_INIT;
+       struct object_array want_obj = OBJECT_ARRAY_INIT;
+
+       clear_object_flags(ALL_FLAGS);
 
        git_config(upload_pack_config, NULL);
 
@@ -1451,7 +1469,7 @@ int upload_pack_v2(struct repository *r, struct argv_array *keys,
        while (state != FETCH_DONE) {
                switch (state) {
                case FETCH_PROCESS_ARGS:
-                       process_args(request, &data);
+                       process_args(request, &data, &want_obj);
 
                        if (!want_obj.nr) {
                                /*
@@ -1473,17 +1491,18 @@ int upload_pack_v2(struct repository *r, struct argv_array *keys,
                        }
                        break;
                case FETCH_SEND_ACKS:
-                       if (process_haves_and_send_acks(&data))
+                       if (process_haves_and_send_acks(&data, &have_obj,
+                                                       &want_obj))
                                state = FETCH_SEND_PACK;
                        else
                                state = FETCH_DONE;
                        break;
                case FETCH_SEND_PACK:
                        send_wanted_ref_info(&data);
-                       send_shallow_info(&data);
+                       send_shallow_info(&data, &want_obj);
 
-                       packet_write_fmt(1, "packfile\n");
-                       create_pack_file();
+                       packet_writer_write(&data.writer, "packfile\n");
+                       create_pack_file(&have_obj, &want_obj);
                        state = FETCH_DONE;
                        break;
                case FETCH_DONE:
@@ -1492,6 +1511,8 @@ int upload_pack_v2(struct repository *r, struct argv_array *keys,
        }
 
        upload_pack_data_clear(&data);
+       object_array_clear(&have_obj);
+       object_array_clear(&want_obj);
        return 0;
 }
 
@@ -1501,6 +1522,7 @@ int upload_pack_advertise(struct repository *r,
        if (value) {
                int allow_filter_value;
                int allow_ref_in_want;
+               int allow_sideband_all_value;
 
                strbuf_addstr(value, "shallow");
 
@@ -1515,6 +1537,13 @@ int upload_pack_advertise(struct repository *r,
                                         &allow_ref_in_want) &&
                    allow_ref_in_want)
                        strbuf_addstr(value, " ref-in-want");
+
+               if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) ||
+                   (!repo_config_get_bool(the_repository,
+                                          "uploadpack.allowsidebandall",
+                                          &allow_sideband_all_value) &&
+                    allow_sideband_all_value))
+                       strbuf_addstr(value, " sideband-all");
        }
 
        return 1;