This patch requires the corresponding patch for repo_write to be
applied first.

diff 1b564763ebbf2659ed1af8474ba471640384301f c5119b16ae24d36f28af86bcbd2221a56af86a61
commit - 1b564763ebbf2659ed1af8474ba471640384301f
commit + c5119b16ae24d36f28af86bcbd2221a56af86a61
blob - 0d1b70abc84b7ffd073e85521770b144812ebcfe
blob + e3a20027002c07e25791ee436b0838e10613c439
--- gotd/gotd.c
+++ gotd/gotd.c
@@ -682,6 +682,7 @@ send_packfile(struct gotd_client *client)
 
 	ipipe.client_id = client->id;
 
+	/* Send pack pipe end 0 to repo_read. */
 	if (gotd_imsg_compose_event(&client->repo_read->iev,
 	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[0],
 	        &ipipe, sizeof(ipipe)) == -1) {
@@ -690,9 +691,9 @@ send_packfile(struct gotd_client *client)
 		return err;
 	}
 
-	if (gotd_imsg_compose_event(&client->repo_read->iev,
-	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1],
-	        &ipipe, sizeof(ipipe)) == -1)
+	/* Send pack pipe end 1 to gotsh(1) (expects just an fd, no data). */
+	if (gotd_imsg_compose_event(&client->iev,
+	    GOTD_IMSG_PACKFILE_PIPE, PROC_GOTD, pipe[1], NULL, 0) == -1)
 		err = got_error_from_errno("imsg compose PACKFILE_PIPE");
 
 	return err;
@@ -2034,7 +2035,7 @@ main(int argc, char **argv)
 		break;
 	case PROC_REPO_READ:
 #ifndef PROFILE
-		if (pledge("stdio rpath sendfd recvfd", NULL) == -1)
+		if (pledge("stdio rpath recvfd", NULL) == -1)
 			err(1, "pledge");
 #endif
 		repo_read_main(title, pack_fds, temp_fds);
blob - b1796ad22b340fe20d6d27d7e25500c103a0e37f
blob + 3acfa77b04f537a7820959d7704e095c2998cde3
--- gotd/repo_read.c
+++ gotd/repo_read.c
@@ -68,7 +68,7 @@ struct repo_read_client {
 	int				 fd;
 	int				 delta_cache_fd;
 	int				 report_progress;
-	int				 pack_pipe[2];
+	int				 pack_pipe;
 	struct gotd_object_id_array	 want_ids;
 	struct gotd_object_id_array	 have_ids;
 };
@@ -91,8 +91,7 @@ add_client(struct repo_read_client *client, uint32_t c
 	client->id = client_id;
 	client->fd = fd;
 	client->delta_cache_fd = -1;
-	client->pack_pipe[0] = -1;
-	client->pack_pipe[1] = -1;
+	client->pack_pipe = -1;
 	slot = client_hash(client->id) % nitems(repo_read_clients);
 	STAILQ_INSERT_HEAD(&repo_read_clients[slot], client, entry);
 }
@@ -641,14 +640,10 @@ receive_pack_pipe(struct repo_read_client **client, st
 	*client = find_client(ireq.client_id);
 	if (*client == NULL)
 		return got_error(GOT_ERR_CLIENT_ID);
-	if ((*client)->pack_pipe[1] != -1)
+	if ((*client)->pack_pipe != -1)
 		return got_error(GOT_ERR_PRIVSEP_MSG);
 
-	if ((*client)->pack_pipe[0] == -1)
-		(*client)->pack_pipe[0] = imsg->fd;
-	else
-		(*client)->pack_pipe[1] = imsg->fd;
-
+	(*client)->pack_pipe = imsg->fd;
 	return NULL;
 }
 
@@ -669,25 +664,11 @@ send_packfile(struct repo_read_client *client, struct 
 
 	got_ratelimit_init(&rl, 2, 0);
 
-	if (client->delta_cache_fd == -1 ||
-	    client->pack_pipe[0] == -1 ||
-	    client->pack_pipe[1] == -1)
+	if (client->delta_cache_fd == -1 || client->pack_pipe == -1)
 		return got_error(GOT_ERR_PRIVSEP_NO_FD);
 
 	imsg_init(&ibuf, client->fd);
 
-	/* Send pack file pipe to gotsh(1). */
-	if (imsg_compose(&ibuf, GOTD_IMSG_PACKFILE_PIPE, PROC_REPO_READ,
-	    repo_read.pid, client->pack_pipe[1], NULL, 0) == -1) {
-		err = got_error_from_errno("imsg_compose ACK");
-		if (err)	
-			goto done;
-	}
-	client->pack_pipe[1] = -1;
-	err = gotd_imsg_flush(&ibuf);
-	if (err)
-		goto done;
-
 	delta_cache = fdopen(client->delta_cache_fd, "w+");
 	if (delta_cache == NULL) {
 		err = got_error_from_errno("fdopen");
@@ -699,7 +680,7 @@ send_packfile(struct repo_read_client *client, struct 
 	pa.ibuf = &ibuf;
 	pa.report_progress = client->report_progress;
 
-	err = got_pack_create(packsha1, client->pack_pipe[0], delta_cache,
+	err = got_pack_create(packsha1, client->pack_pipe, delta_cache,
 	    client->have_ids.ids, client->have_ids.nids,
 	    client->want_ids.ids, client->want_ids.nids,
 	    repo_read.repo, 0, 1, pack_progress, &pa, &rl,
@@ -729,7 +710,7 @@ recv_disconnect(struct imsg *imsg)
 	const struct got_error *err = NULL;
 	struct gotd_imsg_disconnect idisconnect;
 	size_t datalen;
-	int client_fd, delta_cache_fd, pipe[2];
+	int client_fd, delta_cache_fd, pack_pipe;
 	struct repo_read_client *client = NULL;
 	uint64_t slot;
 
@@ -751,17 +732,14 @@ recv_disconnect(struct imsg *imsg)
 	free_object_ids(&client->want_ids);
 	client_fd = client->fd;
 	delta_cache_fd = client->delta_cache_fd;
-	pipe[0] = client->pack_pipe[0];
-	pipe[1] = client->pack_pipe[1];
+	pack_pipe = client->pack_pipe;
 	free(client);
 	if (close(client_fd) == -1)
 		err = got_error_from_errno("close");
 	if (delta_cache_fd != -1 && close(delta_cache_fd) == -1 && err == NULL)
 		return got_error_from_errno("close");
-	if (pipe[0] != -1 && close(pipe[0]) == -1 && err == NULL)
+	if (pack_pipe != -1 && close(pack_pipe) == -1 && err == NULL)
 		return got_error_from_errno("close");
-	if (pipe[1] != -1 && close(pipe[1]) == -1 && err == NULL)
-		return got_error_from_errno("close");
 	return err;
 }
 
@@ -830,7 +808,7 @@ repo_read_dispatch(int fd, short event, void *arg)
 				    repo_read.title, err->msg);
 				break;
 			}
-			if (client->pack_pipe[1] == -1)
+			if (client->pack_pipe == -1)
 				break;
 			err = send_packfile(client, &imsg, iev);
 			if (err)
blob - 07ef39056b1ae8681d10c81839b68eb97c9a1146
blob + 4f35feba02a39ad0317cd252dc1020e7194747e1
--- lib/serve.c
+++ lib/serve.c
@@ -777,20 +777,29 @@ recv_done(int *packfd, int outfd, struct imsgbuf *ibuf
 	if (err)
 		return err;
 
-	err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
-	if (err)
-		return err;
+	while (*packfd == -1 && err == NULL) {
+		err = gotd_imsg_poll_recv(&imsg, ibuf, 0);
+		if (err)
+			break;
 
-	if (imsg.hdr.type == GOTD_IMSG_ERROR)
-		err = gotd_imsg_recv_error(NULL, &imsg);
-	else if (imsg.hdr.type != GOTD_IMSG_PACKFILE_PIPE)
-		err = got_error(GOT_ERR_PRIVSEP_MSG);
-	else if (imsg.fd == -1)
-		err = got_error(GOT_ERR_PRIVSEP_NO_FD);
-	if (err == NULL)
-		*packfd = imsg.fd;
+		switch (imsg.hdr.type) {
+		case GOTD_IMSG_ERROR:
+			err = gotd_imsg_recv_error(NULL, &imsg);
+			break;
+		case GOTD_IMSG_PACKFILE_PIPE:
+			if (imsg.fd != -1)
+				*packfd = imsg.fd;
+			else
+				err = got_error(GOT_ERR_PRIVSEP_NO_FD);
+			break;
+		default:
+			err = got_error(GOT_ERR_PRIVSEP_MSG);
+			break;
+		}
 
-	imsg_free(&imsg);
+		imsg_free(&imsg);
+	}
+
 	return err;
 }