1 files changed, 67 insertions, 44 deletions

diff --git a/upload-pack.c b/upload-pack.c
index aa84576..b3f6653 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -35,7 +35,11 @@ static int multi_ack;
 static int no_done;
 static int use_thin_pack, use_ofs_delta, use_include_tag;
 static int no_progress, daemon_mode;
-static int allow_tip_sha1_in_want;
+/* Allow specifying sha1 if it is a ref tip. */
+#define ALLOW_TIP_SHA1	01
+/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
+#define ALLOW_REACHABLE_SHA1	02
+static unsigned int allow_unadvertised_object_request;
 static int shallow_nr;
 static struct object_array have_obj;
 static struct object_array want_obj;
@@ -74,7 +78,7 @@ static int write_one_shallow(const struct commit_graft *graft, void *cb_data)
 {
 	FILE *fp = cb_data;
 	if (graft->nr_parent == -1)
-		fprintf(fp, "--shallow %s\n", sha1_to_hex(graft->sha1));
+		fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
 	return 0;
 }
 
@@ -126,14 +130,14 @@ static void create_pack_file(void)
 
 	for (i = 0; i < want_obj.nr; i++)
 		fprintf(pipe_fd, "%s\n",
-			sha1_to_hex(want_obj.objects[i].item->sha1));
+			oid_to_hex(&want_obj.objects[i].item->oid));
 	fprintf(pipe_fd, "--not\n");
 	for (i = 0; i < have_obj.nr; i++)
 		fprintf(pipe_fd, "%s\n",
-			sha1_to_hex(have_obj.objects[i].item->sha1));
+			oid_to_hex(&have_obj.objects[i].item->oid));
 	for (i = 0; i < extra_edge_obj.nr; i++)
 		fprintf(pipe_fd, "%s\n",
-			sha1_to_hex(extra_edge_obj.objects[i].item->sha1));
+			oid_to_hex(&extra_edge_obj.objects[i].item->oid));
 	fprintf(pipe_fd, "\n");
 	fflush(pipe_fd);
 	fclose(pipe_fd);
@@ -312,17 +316,15 @@ static int reachable(struct commit *want)
 
 	commit_list_insert_by_date(want, &work);
 	while (work) {
-		struct commit_list *list = work->next;
-		struct commit *commit = work->item;
-		free(work);
-		work = list;
+		struct commit_list *list;
+		struct commit *commit = pop_commit(&work);
 
 		if (commit->object.flags & THEY_HAVE) {
 			want->object.flags |= COMMON_KNOWN;
 			break;
 		}
 		if (!commit->object.parsed)
-			parse_object(commit->object.sha1);
+			parse_object(commit->object.oid.hash);
 		if (commit->object.flags & REACHABLE)
 			continue;
 		commit->object.flags |= REACHABLE;
@@ -442,8 +444,9 @@ static int get_common_commits(void)
 
 static int is_our_ref(struct object *o)
 {
-	return o->flags &
-		((allow_tip_sha1_in_want ? HIDDEN_REF : 0) | OUR_REF);
+	int allow_hidden_ref = (allow_unadvertised_object_request &
+			(ALLOW_TIP_SHA1 | ALLOW_REACHABLE_SHA1));
+	return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) | OUR_REF);
 }
 
 static void check_non_tip(void)
@@ -456,8 +459,12 @@ static void check_non_tip(void)
 	char namebuf[42]; /* ^ + SHA-1 + LF */
 	int i;
 
-	/* In the normal in-process case non-tip request can never happen */
-	if (!stateless_rpc)
+	/*
+	 * In the normal in-process case without
+	 * uploadpack.allowReachableSHA1InWant,
+	 * non-tip requests can never happen.
+	 */
+	if (!stateless_rpc && !(allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1))
 		goto error;
 
 	cmd.argv = argv;
@@ -484,7 +491,7 @@ static void check_non_tip(void)
 			continue;
 		if (!is_our_ref(o))
 			continue;
-		memcpy(namebuf + 1, sha1_to_hex(o->sha1), 40);
+		memcpy(namebuf + 1, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 		if (write_in_full(cmd.in, namebuf, 42) < 0)
 			goto error;
 	}
@@ -493,7 +500,7 @@ static void check_non_tip(void)
 		o = want_obj.objects[i].item;
 		if (is_our_ref(o))
 			continue;
-		memcpy(namebuf, sha1_to_hex(o->sha1), 40);
+		memcpy(namebuf, oid_to_hex(&o->oid), GIT_SHA1_HEXSZ);
 		if (write_in_full(cmd.in, namebuf, 41) < 0)
 			goto error;
 	}
@@ -527,7 +534,7 @@ error:
 		o = want_obj.objects[i].item;
 		if (!is_our_ref(o))
 			die("git upload-pack: not our ref %s",
-			    sha1_to_hex(o->sha1));
+			    oid_to_hex(&o->oid));
 	}
 }
 
@@ -639,8 +646,8 @@ static void receive_needs(void)
 			struct object *object = &result->item->object;
 			if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
 				packet_write(1, "shallow %s",
-						sha1_to_hex(object->sha1));
-				register_shallow(object->sha1);
+						oid_to_hex(&object->oid));
+				register_shallow(object->oid.hash);
 				shallow_nr++;
 			}
 			result = result->next;
@@ -651,10 +658,10 @@ static void receive_needs(void)
 			if (object->flags & NOT_SHALLOW) {
 				struct commit_list *parents;
 				packet_write(1, "unshallow %s",
-					sha1_to_hex(object->sha1));
+					oid_to_hex(&object->oid));
 				object->flags &= ~CLIENT_SHALLOW;
 				/* make sure the real parents are parsed */
-				unregister_shallow(object->sha1);
+				unregister_shallow(object->oid.hash);
 				object->parsed = 0;
 				parse_commit_or_die((struct commit *)object);
 				parents = ((struct commit *)object)->parents;
@@ -666,14 +673,14 @@ static void receive_needs(void)
 				add_object_array(object, NULL, &extra_edge_obj);
 			}
 			/* make sure commit traversal conforms to client */
-			register_shallow(object->sha1);
+			register_shallow(object->oid.hash);
 		}
 		packet_flush(1);
 	} else
 		if (shallows.nr > 0) {
 			int i;
 			for (i = 0; i < shallows.nr; i++)
-				register_shallow(shallows.objects[i].item->sha1);
+				register_shallow(shallows.objects[i].item->oid.hash);
 		}
 
 	shallow_nr += shallows.nr;
@@ -681,11 +688,12 @@ static void receive_needs(void)
 }
 
 /* return non-zero if the ref is hidden, otherwise 0 */
-static int mark_our_ref(const char *refname, const unsigned char *sha1)
+static int mark_our_ref(const char *refname, const char *refname_full,
+			const struct object_id *oid)
 {
-	struct object *o = lookup_unknown_object(sha1);
+	struct object *o = lookup_unknown_object(oid->hash);
 
-	if (ref_is_hidden(refname)) {
+	if (ref_is_hidden(refname, refname_full)) {
 		o->flags |= HIDDEN_REF;
 		return 1;
 	}
@@ -693,9 +701,12 @@ static int mark_our_ref(const char *refname, const unsigned char *sha1)
 	return 0;
 }
 
-static int check_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+static int check_ref(const char *refname_full, const struct object_id *oid,
+		     int flag, void *cb_data)
 {
-	mark_our_ref(refname, sha1);
+	const char *refname = strip_namespace(refname_full);
+
+	mark_our_ref(refname, refname_full, oid);
 	return 0;
 }
 
@@ -709,48 +720,52 @@ static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 		strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 }
 
-static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
+static int send_ref(const char *refname, const struct object_id *oid,
+		    int flag, void *cb_data)
 {
 	static const char *capabilities = "multi_ack thin-pack side-band"
 		" side-band-64k ofs-delta shallow no-progress"
 		" include-tag multi_ack_detailed";
 	const char *refname_nons = strip_namespace(refname);
-	unsigned char peeled[20];
+	struct object_id peeled;
 
-	if (mark_our_ref(refname, sha1))
+	if (mark_our_ref(refname_nons, refname, oid))
 		return 0;
 
 	if (capabilities) {
 		struct strbuf symref_info = STRBUF_INIT;
 
 		format_symref_info(&symref_info, cb_data);
-		packet_write(1, "%s %s%c%s%s%s%s agent=%s\n",
-			     sha1_to_hex(sha1), refname_nons,
+		packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
+			     oid_to_hex(oid), refname_nons,
 			     0, capabilities,
-			     allow_tip_sha1_in_want ? " allow-tip-sha1-in-want" : "",
+			     (allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
+				     " allow-tip-sha1-in-want" : "",
+			     (allow_unadvertised_object_request & ALLOW_REACHABLE_SHA1) ?
+				     " allow-reachable-sha1-in-want" : "",
 			     stateless_rpc ? " no-done" : "",
 			     symref_info.buf,
 			     git_user_agent_sanitized());
 		strbuf_release(&symref_info);
 	} else {
-		packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname_nons);
+		packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
 	}
 	capabilities = NULL;
-	if (!peel_ref(refname, peeled))
-		packet_write(1, "%s %s^{}\n", sha1_to_hex(peeled), refname_nons);
+	if (!peel_ref(refname, peeled.hash))
+		packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
 	return 0;
 }
 
-static int find_symref(const char *refname, const unsigned char *sha1, int flag,
-		       void *cb_data)
+static int find_symref(const char *refname, const struct object_id *oid,
+		       int flag, void *cb_data)
 {
 	const char *symref_target;
 	struct string_list_item *item;
-	unsigned char unused[20];
+	struct object_id unused;
 
 	if ((flag & REF_ISSYMREF) == 0)
 		return 0;
-	symref_target = resolve_ref_unsafe(refname, 0, unused, &flag);
+	symref_target = resolve_ref_unsafe(refname, 0, unused.hash, &flag);
 	if (!symref_target || (flag & REF_ISSYMREF) == 0)
 		die("'%s' is a symref but it is not?", refname);
 	item = string_list_append(cb_data, refname);
@@ -787,9 +802,17 @@ static void upload_pack(void)
 
 static int upload_pack_config(const char *var, const char *value, void *unused)
 {
-	if (!strcmp("uploadpack.allowtipsha1inwant", var))
-		allow_tip_sha1_in_want = git_config_bool(var, value);
-	else if (!strcmp("uploadpack.keepalive", var)) {
+	if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
+		if (git_config_bool(var, value))
+			allow_unadvertised_object_request |= ALLOW_TIP_SHA1;
+		else
+			allow_unadvertised_object_request &= ~ALLOW_TIP_SHA1;
+	} else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
+		if (git_config_bool(var, value))
+			allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
+		else
+			allow_unadvertised_object_request &= ~ALLOW_REACHABLE_SHA1;
+	} else if (!strcmp("uploadpack.keepalive", var)) {
 		keepalive = git_config_int(var, value);
 		if (!keepalive)
 			keepalive = -1;