thodg/got/lib/send.c

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• Hash : 535e07c7
  Author :
  Date : 2021-08-29T13:09:21
  

  make realloc_ids() malloc-like and do not overallocate Let realloc_ids() take as argument the number of entries to allocate. Do not allocate an extra chunk. ok stsp

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• lib/send.c

• /*
   * Copyright (c) 2018, 2019 Ori Bernstein <ori@openbsd.org>
   * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/queue.h>
  #include <sys/uio.h>
  #include <sys/socket.h>
  #include <sys/wait.h>
  #include <sys/resource.h>
  #include <sys/socket.h>
  
  #include <endian.h>
  #include <errno.h>
  #include <err.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdint.h>
  #include <sha1.h>
  #include <unistd.h>
  #include <zlib.h>
  #include <ctype.h>
  #include <limits.h>
  #include <imsg.h>
  #include <time.h>
  #include <uuid.h>
  #include <netdb.h>
  #include <netinet/in.h>
  
  #include "got_error.h"
  #include "got_reference.h"
  #include "got_repository.h"
  #include "got_path.h"
  #include "got_cancel.h"
  #include "got_worktree.h"
  #include "got_object.h"
  #include "got_opentemp.h"
  #include "got_send.h"
  #include "got_repository_admin.h"
  #include "got_commit_graph.h"
  
  #include "got_lib_delta.h"
  #include "got_lib_inflate.h"
  #include "got_lib_object.h"
  #include "got_lib_object_parse.h"
  #include "got_lib_object_create.h"
  #include "got_lib_pack.h"
  #include "got_lib_sha1.h"
  #include "got_lib_privsep.h"
  #include "got_lib_object_cache.h"
  #include "got_lib_repository.h"
  #include "got_lib_pack_create.h"
  
  #ifndef nitems
  #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  #endif
  
  #ifndef ssizeof
  #define ssizeof(_x) ((ssize_t)(sizeof(_x)))
  #endif
  
  #ifndef MIN
  #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  #endif
  
  static const struct got_error *
  dial_ssh(pid_t *sendpid, int *sendfd, const char *host, const char *port,
      const char *path, const char *direction, int verbosity)
  {
  	const struct got_error *error = NULL;
  	int pid, pfd[2];
  	char cmd[64];
  	char *argv[11];
  	int i = 0, j;
  
  	*sendpid = -1;
  	*sendfd = -1;
  
  	argv[i++] = GOT_SEND_PATH_SSH;
  	if (port != NULL) {
  		argv[i++] = "-p";
  		argv[i++] = (char *)port;
  	}
  	if (verbosity == -1) {
  		argv[i++] = "-q";
  	} else {
  		/* ssh(1) allows up to 3 "-v" options. */
  		for (j = 0; j < MIN(3, verbosity); j++)
  			argv[i++] = "-v";
  	}
  	argv[i++] = "--";
  	argv[i++] = (char *)host;
  	argv[i++] = (char *)cmd;
  	argv[i++] = (char *)path;
  	argv[i++] = NULL;
  
  	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pfd) == -1)
  		return got_error_from_errno("socketpair");
  
  	pid = fork();
  	if (pid == -1) {
  		error = got_error_from_errno("fork");
  		close(pfd[0]);
  		close(pfd[1]);
  		return error;
  	} else if (pid == 0) {
  		int n;
  		if (close(pfd[1]) == -1)
  			err(1, "close");
  		if (dup2(pfd[0], 0) == -1)
  			err(1, "dup2");
  		if (dup2(pfd[0], 1) == -1)
  			err(1, "dup2");
  		n = snprintf(cmd, sizeof(cmd), "git-%s-pack", direction);
  		if (n < 0 || n >= ssizeof(cmd))
  			err(1, "snprintf");
  		if (execv(GOT_SEND_PATH_SSH, argv) == -1)
  			err(1, "execv");
  		abort(); /* not reached */
  	} else {
  		if (close(pfd[0]) == -1)
  			return got_error_from_errno("close");
  		*sendpid = pid;
  		*sendfd = pfd[1];
  		return NULL;
  	}
  }
  
  static const struct got_error *
  dial_git(int *sendfd, const char *host, const char *port, const char *path,
      const char *direction)
  {
  	const struct got_error *err = NULL;
  	struct addrinfo hints, *servinfo, *p;
  	char *cmd = NULL;
  	int fd = -1, len, r, eaicode;
  
  	*sendfd = -1;
  
  	if (port == NULL)
  		port = GOT_DEFAULT_GIT_PORT_STR;
  
  	memset(&hints, 0, sizeof hints);
  	hints.ai_family = AF_UNSPEC;
  	hints.ai_socktype = SOCK_STREAM;
  	eaicode = getaddrinfo(host, port, &hints, &servinfo);
  	if (eaicode) {
  		char msg[512];
  		snprintf(msg, sizeof(msg), "%s: %s", host,
  		    gai_strerror(eaicode));
  		return got_error_msg(GOT_ERR_ADDRINFO, msg);
  	}
  
  	for (p = servinfo; p != NULL; p = p->ai_next) {
  		if ((fd = socket(p->ai_family, p->ai_socktype,
  		    p->ai_protocol)) == -1)
  			continue;
  		if (connect(fd, p->ai_addr, p->ai_addrlen) == 0) {
  			err = NULL;
  			break;
  		}
  		err = got_error_from_errno("connect");
  		close(fd);
  	}
  	if (p == NULL)
  		goto done;
  
  	if (asprintf(&cmd, "git-%s-pack %s", direction, path) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  	len = 4 + strlen(cmd) + 1 + strlen("host=") + strlen(host) + 1;
  	r = dprintf(fd, "%04x%s%chost=%s%c", len, cmd, '\0', host, '\0');
  	if (r < 0)
  		err = got_error_from_errno("dprintf");
  done:
  	free(cmd);
  	if (err) {
  		if (fd != -1)
  			close(fd);
  	} else
  		*sendfd = fd;
  	return err;
  }
  
  const struct got_error *
  got_send_connect(pid_t *sendpid, int *sendfd, const char *proto,
      const char *host, const char *port, const char *server_path, int verbosity)
  {
  	const struct got_error *err = NULL;
  
  	*sendpid = -1;
  	*sendfd = -1;
  
  	if (strcmp(proto, "ssh") == 0 || strcmp(proto, "git+ssh") == 0)
  		err = dial_ssh(sendpid, sendfd, host, port, server_path,
  		    "receive", verbosity);
  	else if (strcmp(proto, "git") == 0)
  		err = dial_git(sendfd, host, port, server_path, "receive");
  	else if (strcmp(proto, "http") == 0 || strcmp(proto, "git+http") == 0)
  		err = got_error_path(proto, GOT_ERR_NOT_IMPL);
  	else
  		err = got_error_path(proto, GOT_ERR_BAD_PROTO);
  	return err;
  }
  
  struct pack_progress_arg {
      got_send_progress_cb progress_cb;
      void *progress_arg;
  
      off_t packfile_size;
      int ncommits;
      int nobj_total;
      int nobj_deltify;
      int nobj_written;
  };
  
  static const struct got_error *
  pack_progress(void *arg, off_t packfile_size, int ncommits,
      int nobj_total, int nobj_deltify, int nobj_written)
  {
  	const struct got_error *err;
  	struct pack_progress_arg *a = arg;
  
  	err = a->progress_cb(a->progress_arg, packfile_size, ncommits,
  	    nobj_total, nobj_deltify, nobj_written, 0, NULL, 0);
  	if (err)
  		return err;
  
  	a->packfile_size = packfile_size;
  	a->ncommits = ncommits;
  	a->nobj_total = nobj_total;
  	a->nobj_deltify = nobj_deltify;
  	a->nobj_written = nobj_written;
  	return NULL;
  }
  
  static const struct got_error *
  insert_ref(struct got_reflist_head *refs, const char *refname,
      struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_reference *ref;
  	struct got_reflist_entry *new;
  
  	err = got_ref_open(&ref, repo, refname, 0);
  	if (err)
  		return err;
  
  	err = got_reflist_insert(&new, refs, ref, got_ref_cmp_by_name, NULL);
  	if (err || new == NULL /* duplicate */)
  		got_ref_close(ref);
  
  	return err;
  }
  
  static const struct got_error *
  check_linear_ancestry(const char *refname, struct got_object_id *my_id,
      struct got_object_id *their_id, struct got_repository *repo,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err = NULL;
  	struct got_object_id *yca_id;
  	int obj_type;
  
  	err = got_object_get_type(&obj_type, repo, their_id);
  	if (err)
  		return err;
  	if (obj_type != GOT_OBJ_TYPE_COMMIT)
  		return got_error_fmt(GOT_ERR_OBJ_TYPE,
  		    "bad object type on server for %s", refname);
  
  	err = got_commit_graph_find_youngest_common_ancestor(&yca_id,
  	    my_id, their_id, repo, cancel_cb, cancel_arg);
  	if (err)
  		return err;
  	if (yca_id == NULL)
  		return got_error_fmt(GOT_ERR_SEND_ANCESTRY, "%s", refname);
  
  	/*
  	 * Require a straight line of history between the two commits,
  	 * with their commit being older than my commit.
  	 *
  	 * Non-linear situations such as this require a rebase:
  	 *
  	 * (theirs) D       F (mine)
  	 *           \     /
  	 *            C   E
  	 *             \ /
  	 *              B (yca)
  	 *              |
  	 *              A
  	 */
  	if (got_object_id_cmp(their_id, yca_id) != 0)
  		err = got_error_fmt(GOT_ERR_SEND_ANCESTRY, "%s", refname);
  
  	free(yca_id);
  	return err;
  }
  
  static const struct got_error *
  realloc_ids(struct got_object_id ***ids, size_t *nalloc, size_t n)
  {
  	struct got_object_id **new;
  	const size_t alloc_chunksz = 256;
  
  	if (*nalloc >= n)
  		return NULL;
  
  	new = recallocarray(*ids, *nalloc, *nalloc + alloc_chunksz,
  	    sizeof(struct got_object_id));
  	if (new == NULL)
  		return got_error_from_errno("recallocarray");
  
  	*ids = new;
  	*nalloc += alloc_chunksz;
  	return NULL;
  }
  
  static struct got_reference *
  find_ref(struct got_reflist_head *refs, const char *refname)
  {
  	struct got_reflist_entry *re;
  
  	TAILQ_FOREACH(re, refs, entry) {
  		if (got_path_cmp(got_ref_get_name(re->ref), refname,
  		    strlen(got_ref_get_name(re->ref)),
  		    strlen(refname)) == 0) {
  			return re->ref;
  		}
  	}
  
  	return NULL;
  }
  
  static struct got_pathlist_entry *
  find_their_ref(struct got_pathlist_head *their_refs, const char *refname)
  {
  	struct got_pathlist_entry *pe;
  
  	TAILQ_FOREACH(pe, their_refs, entry) {
  		const char *their_refname = pe->path;
  		if (got_path_cmp(their_refname, refname,
  		    strlen(their_refname), strlen(refname)) == 0) {
  			return pe;
  		}
  	}
  
  	return NULL;
  }
  
  static const struct got_error *
  get_remote_refname(char **remote_refname, const char *remote_name,
      const char *refname)
  {
  	if (strncmp(refname, "refs/", 5) == 0)
  		refname += 5;
  	if (strncmp(refname, "heads/", 6) == 0)
  		refname += 6;
  
  	if (asprintf(remote_refname, "refs/remotes/%s/%s",
  	    remote_name, refname) == -1)
  		return got_error_from_errno("asprintf");
  
  	return NULL;
  }
  
  static const struct got_error *
  update_remote_ref(struct got_reference *my_ref, const char *remote_name,
      struct got_repository *repo)
  {
  	const struct got_error *err, *unlock_err;
  	struct got_object_id *my_id;
  	struct got_reference *ref = NULL;
  	char *remote_refname = NULL;
  	int ref_locked = 0;
  
  	err = got_ref_resolve(&my_id, repo, my_ref);
  	if (err)
  		return err;
  
  	err = get_remote_refname(&remote_refname, remote_name,
  	    got_ref_get_name(my_ref));
  	if (err)
  		goto done;
  
  	err = got_ref_open(&ref, repo, remote_refname, 1 /* lock */);
  	if (err) {
  		if (err->code != GOT_ERR_NOT_REF)
  			goto done;
  		err = got_ref_alloc(&ref, remote_refname, my_id);
  		if (err)
  			goto done;
  	} else {
  		ref_locked = 1;
  		err = got_ref_change_ref(ref, my_id);
  		if (err)
  			goto done;
  	}
  
  	err = got_ref_write(ref, repo);
  done:
  	if (ref) {
  		if (ref_locked) {
  			unlock_err = got_ref_unlock(ref);
  			if (unlock_err && err == NULL)
  				err = unlock_err;
  		}
  		got_ref_close(ref);
  	}
  	free(my_id);
  	free(remote_refname);
  	return err;
  }
  
  const struct got_error*
  got_send_pack(const char *remote_name, struct got_pathlist_head *branch_names,
      struct got_pathlist_head *tag_names,
      struct got_pathlist_head *delete_branches,
      int verbosity, int overwrite_refs, int sendfd,
      struct got_repository *repo, got_send_progress_cb progress_cb,
      void *progress_arg, got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	int imsg_sendfds[2];
  	int npackfd = -1, nsendfd = -1;
  	int sendstatus, done = 0;
  	const struct got_error *err;
  	struct imsgbuf sendibuf;
  	pid_t sendpid = -1;
  	struct got_reflist_head refs;
  	struct got_pathlist_head have_refs;
  	struct got_pathlist_head their_refs;
  	struct got_pathlist_entry *pe;
  	struct got_reflist_entry *re;
  	struct got_object_id **our_ids = NULL;
  	struct got_object_id **their_ids = NULL;
  	struct got_object_id *my_id = NULL;
  	int i, nours = 0, ntheirs = 0;
  	size_t nalloc_ours = 0, nalloc_theirs = 0;
  	int refs_to_send = 0, refs_to_delete = 0;
  	off_t bytes_sent = 0;
  	struct pack_progress_arg ppa;
  	uint8_t packsha1[SHA1_DIGEST_LENGTH];
  	FILE *packfile = NULL;
  
  	TAILQ_INIT(&refs);
  	TAILQ_INIT(&have_refs);
  	TAILQ_INIT(&their_refs);
  
  	TAILQ_FOREACH(pe, branch_names, entry) {
  		const char *branchname = pe->path;
  		if (strncmp(branchname, "refs/heads/", 11) != 0) {
  			char *s;
  			if (asprintf(&s, "refs/heads/%s", branchname) == -1) {
  				err = got_error_from_errno("asprintf");
  				goto done;
  			}
  			err = insert_ref(&refs, s, repo);
  			free(s);
  		} else {
  			err = insert_ref(&refs, branchname, repo);
  		}
  		if (err)
  			goto done;
  	}
  
  	TAILQ_FOREACH(pe, delete_branches, entry) {
  		const char *branchname = pe->path;
  		struct got_reference *ref;
  		if (strncmp(branchname, "refs/heads/", 11) != 0) {
  			err = got_error_fmt(GOT_ERR_SEND_DELETE_REF, "%s",
  			    branchname);
  			goto done;
  		}
  		ref = find_ref(&refs, branchname);
  		if (ref) {
  			err = got_error_fmt(GOT_ERR_SEND_DELETE_REF,
  			    "changes on %s will be sent to server",
  			    branchname);
  			goto done;
  		}
  	}
  
  	TAILQ_FOREACH(pe, tag_names, entry) {
  		const char *tagname = pe->path;
  		if (strncmp(tagname, "refs/tags/", 10) != 0) {
  			char *s;
  			if (asprintf(&s, "refs/tags/%s", tagname) == -1) {
  				err = got_error_from_errno("asprintf");
  				goto done;
  			}
  			err = insert_ref(&refs, s, repo);
  			free(s);
  		} else {
  			err = insert_ref(&refs, tagname, repo);
  		}
  		if (err)
  			goto done;
  	}
  
  	if (TAILQ_EMPTY(&refs) && TAILQ_EMPTY(delete_branches)) {
  		err = got_error(GOT_ERR_SEND_EMPTY);
  		goto done;
  	}
  
  	TAILQ_FOREACH(re, &refs, entry) {
  		struct got_object_id *id;
  		int obj_type;
  
  		if (got_ref_is_symbolic(re->ref)) {
  			err = got_error_fmt(GOT_ERR_BAD_REF_TYPE,
  			    "cannot send symbolic reference %s",
  			    got_ref_get_name(re->ref));
  			goto done;
  		}
  
  		err = got_ref_resolve(&id, repo, re->ref);
  		if (err)
  			goto done;
  		err = got_object_get_type(&obj_type, repo, id);
  		free(id);
  		if (err)
  			goto done;
  		switch (obj_type) {
  		case GOT_OBJ_TYPE_COMMIT:
  		case GOT_OBJ_TYPE_TAG:
  			break;
  		default:
  			err = got_error_fmt(GOT_ERR_OBJ_TYPE,
  			    "cannot send %s", got_ref_get_name(re->ref));
  			goto done;
  		}
  	}
  
  	packfile = got_opentemp();
  	if (packfile == NULL) {
  		err = got_error_from_errno("got_opentemp");
  		goto done;
  	}
  
  	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_sendfds) == -1) {
  		err = got_error_from_errno("socketpair");
  		goto done;
  	}
  
  	sendpid = fork();
  	if (sendpid == -1) {
  		err = got_error_from_errno("fork");
  		goto done;
  	} else if (sendpid == 0){
  		got_privsep_exec_child(imsg_sendfds,
  		    GOT_PATH_PROG_SEND_PACK, got_repo_get_path(repo));
  	}
  
  	if (close(imsg_sendfds[1]) == -1) {
  		err = got_error_from_errno("close");
  		goto done;
  	}
  	imsg_init(&sendibuf, imsg_sendfds[0]);
  	nsendfd = dup(sendfd);
  	if (nsendfd == -1) {
  		err = got_error_from_errno("dup");
  		goto done;
  	}
  
  	/*
  	 * Convert reflist to pathlist since the privsep layer
  	 * is linked into helper programs which lack reference.c.
  	 */
  	TAILQ_FOREACH(re, &refs, entry) {
  		struct got_object_id *id;
  		err = got_ref_resolve(&id, repo, re->ref);
  		if (err)
  			goto done;
  		err = got_pathlist_append(&have_refs,
  		    got_ref_get_name(re->ref), id);
  		if (err)
  			goto done;
  		/*
  		 * Also prepare the array of our object IDs which
  		 * will be needed for generating a pack file.
  		 */
  		err = realloc_ids(&our_ids, &nalloc_ours, nours + 1);
  		if (err)
  			goto done;
  		our_ids[nours] = id;
  		nours++;
  	}
  
  	err = got_privsep_send_send_req(&sendibuf, nsendfd, &have_refs,
  	    delete_branches, verbosity);
  	if (err)
  		goto done;
  	nsendfd = -1;
  
  	err = got_privsep_recv_send_remote_refs(&their_refs, &sendibuf);
  	if (err)
  		goto done;
  
  	/*
  	 * Process references reported by the server.
  	 * Push appropriate object IDs onto the "their IDs" array.
  	 * This array will be used to exclude objects which already
  	 * exist on the server from our pack file.
  	 */
  	TAILQ_FOREACH(pe, &their_refs, entry) {
  		const char *refname = pe->path;
  		struct got_object_id *their_id = pe->data;
  		int have_their_id;
  		struct got_object *obj;
  		struct got_reference *my_ref = NULL;
  		int is_tag = 0;
  
  		/* Don't blindly trust the server to send us valid names. */
  		if (!got_ref_name_is_valid(refname))
  			continue;
  
  		/*
  		 * Find out whether this is a reference we want to upload.
  		 * Otherwise we can still use this reference as a hint to
  		 * avoid uploading any objects the server already has.
  		 */
  		my_ref = find_ref(&refs, refname);
  		if (my_ref) {
  			err = got_ref_resolve(&my_id, repo, my_ref);
  			if (err)
  				goto done;
  			if (got_object_id_cmp(my_id, their_id) == 0) {
  				free(my_id);
  				my_id = NULL;
  				continue;
  			}
  			refs_to_send++;
  
  		}
  
  		if (strncmp(refname, "refs/tags/", 10) == 0)
  			is_tag = 1;
  
  		/* Prevent tags from being overwritten by default. */ 
  		if (!overwrite_refs && my_ref && is_tag) {
  			err = got_error_fmt(GOT_ERR_SEND_TAG_EXISTS,
  			    "%s", refname);
  			goto done;
  		}
  
  		/* Check if their object exists locally. */
  		err = got_object_open(&obj, repo, their_id);
  		if (err) {
  			if (err->code != GOT_ERR_NO_OBJ)
  				goto done;
  			if (!overwrite_refs && my_ref != NULL) {
  				err = got_error_fmt(GOT_ERR_SEND_ANCESTRY,
  				    "%s", refname);
  				goto done;
  			}
  			have_their_id = 0;
  		} else {
  			got_object_close(obj);
  			have_their_id = 1;
  		}
  
  		err = realloc_ids(&their_ids, &nalloc_theirs, ntheirs + 1);
  		if (err)
  			goto done;
  
  		if (have_their_id) {
  			/* Enforce linear ancestry if required. */
  			if (!overwrite_refs && my_ref && !is_tag) {
  				struct got_object_id *my_id;
  				err = got_ref_resolve(&my_id, repo, my_ref);
  				if (err)
  					goto done;
  				err = check_linear_ancestry(refname, my_id,
  				    their_id, repo, cancel_cb, cancel_arg);
  				free(my_id);
  				my_id = NULL;
  				if (err)
  					goto done;
  			}
  			/* Exclude any objects reachable via their ID. */
  			their_ids[ntheirs] = got_object_id_dup(their_id);
  			if (their_ids[ntheirs] == NULL) {
  				err = got_error_from_errno("got_object_id_dup");
  				goto done;
  			}
  			ntheirs++;
  		} else if (!is_tag) {
  			char *remote_refname;
  			struct got_reference *ref;
  			/*
  			 * Exclude any objects which exist on the server
  			 * according to a locally cached remote reference.
  			 */
  			err = get_remote_refname(&remote_refname,
  			    remote_name, refname);
  			if (err)
  				goto done;
  			err = got_ref_open(&ref, repo, remote_refname, 0);
  			free(remote_refname);
  			if (err) {
  				if (err->code != GOT_ERR_NOT_REF)
  					goto done;
  			} else {
  				err = got_ref_resolve(&their_ids[ntheirs],
  				    repo, ref);
  				got_ref_close(ref);
  				if (err)
  					goto done;
  				ntheirs++;
  			}
  		}
  	}
  
  	/* Account for any new references we are going to upload. */
  	TAILQ_FOREACH(re, &refs, entry) {
  		if (find_their_ref(&their_refs,
  		    got_ref_get_name(re->ref)) == NULL)
  			refs_to_send++;
  	}
  
  	/* Account for any existing references we are going to delete. */
  	TAILQ_FOREACH(pe, delete_branches, entry) {
  		const char *branchname = pe->path;
  		if (find_their_ref(&their_refs, branchname))
  			refs_to_delete++;
  	}
  
  	if (refs_to_send == 0 && refs_to_delete == 0) {
  		got_privsep_send_stop(imsg_sendfds[0]);
  		goto done;
  	}
  
  	if (refs_to_send > 0) {
  		memset(&ppa, 0, sizeof(ppa));
  		ppa.progress_cb = progress_cb;
  		ppa.progress_arg = progress_arg;
  		err = got_pack_create(packsha1, packfile, their_ids, ntheirs,
  		    our_ids, nours, repo, 0, 1, pack_progress, &ppa,
  		    cancel_cb, cancel_arg);
  		if (err)
  			goto done;
  
  		if (fflush(packfile) == -1) {
  			err = got_error_from_errno("fflush");
  			goto done;
  		}
  
  		npackfd = dup(fileno(packfile));
  		if (npackfd == -1) {
  			err = got_error_from_errno("dup");
  			goto done;
  		}
  		err = got_privsep_send_packfd(&sendibuf, npackfd);
  		if (err != NULL)
  			goto done;
  		npackfd = -1;
  	} else {
  		err = got_privsep_send_packfd(&sendibuf, -1);
  		if (err != NULL)
  			goto done;
  	}
  
  	while (!done) {
  		int success = 0;
  		char *refname = NULL;
  		off_t bytes_sent_cur = 0;
  		if (cancel_cb) {
  			err = (*cancel_cb)(cancel_arg);
  			if (err)
  				goto done;
  		}
  		err = got_privsep_recv_send_progress(&done, &bytes_sent,
  		    &success, &refname, &sendibuf);
  		if (err)
  			goto done;
  		if (refname && got_ref_name_is_valid(refname) && success &&
  		    strncmp(refname, "refs/tags/", 10) != 0) {
  			struct got_reference *my_ref;
  			/*
  			 * The server has accepted our changes.
  			 * Update our reference in refs/remotes/ accordingly.
  			 */
  			my_ref = find_ref(&refs, refname);
  			if (my_ref) {
  				err = update_remote_ref(my_ref, remote_name,
  				    repo);
  				if (err)
  					goto done;
  			}
  		}
  		if (refname != NULL ||
  		    bytes_sent_cur != bytes_sent) {
  			err = progress_cb(progress_arg, ppa.packfile_size,
  			    ppa.ncommits, ppa.nobj_total, ppa.nobj_deltify,
  			    ppa.nobj_written, bytes_sent,
  			    refname, success);
  			if (err) {
  				free(refname);
  				goto done;
  			}
  			bytes_sent_cur = bytes_sent;
  		}
  		free(refname);
  	}
  done:
  	if (sendpid != -1) {
  		if (err)
  			got_privsep_send_stop(imsg_sendfds[0]);
  		if (waitpid(sendpid, &sendstatus, 0) == -1 && err == NULL)
  			err = got_error_from_errno("waitpid");
  	}
  	if (packfile && fclose(packfile) == EOF && err == NULL)
  		err = got_error_from_errno("fclose");
  	if (nsendfd != -1 && close(nsendfd) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  
  	got_ref_list_free(&refs);
  	got_pathlist_free(&have_refs);
  	got_pathlist_free(&their_refs);
  	for (i = 0; i < nours; i++)
  		free(our_ids[i]);
  	free(our_ids);
  	for (i = 0; i < ntheirs; i++)
  		free(their_ids[i]);
  	free(their_ids);
  	free(my_id);
  	return err;
  }
  

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