thodg/got/lib/object.c

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• Hash : 2673a8da
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  Date : 2018-09-19T20:01:20
  

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• lib/object.c

• /*
   * Copyright (c) 2018 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/syslimits.h>
  
  #include <errno.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <stdint.h>
  #include <sha1.h>
  #include <zlib.h>
  #include <ctype.h>
  #include <limits.h>
  #include <imsg.h>
  #include <time.h>
  
  #include "got_error.h"
  #include "got_object.h"
  #include "got_repository.h"
  #include "got_opentemp.h"
  
  #include "got_lib_sha1.h"
  #include "got_lib_delta.h"
  #include "got_lib_pack.h"
  #include "got_lib_path.h"
  #include "got_lib_inflate.h"
  #include "got_lib_object.h"
  #include "got_lib_privsep.h"
  #include "got_lib_object_idcache.h"
  #include "got_lib_object_cache.h"
  #include "got_lib_object_parse.h"
  #include "got_lib_repository.h"
  
  #ifndef MIN
  #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
  #endif
  
  int
  got_object_id_cmp(struct got_object_id *id1, struct got_object_id *id2)
  {
  	return memcmp(id1->sha1, id2->sha1, SHA1_DIGEST_LENGTH);
  }
  
  struct got_object_id *
  got_object_id_dup(struct got_object_id *id1)
  {
  	struct got_object_id *id2;
  
  	id2 = malloc(sizeof(*id2));
  	if (id2 == NULL)
  		return NULL;
  	memcpy(id2, id1, sizeof(*id2));
  	return id2;
  }
  
  struct got_object_id *
  got_object_get_id(struct got_object *obj)
  {
  	return &obj->id;
  }
  
  const struct got_error *
  got_object_get_id_str(char **outbuf, struct got_object *obj)
  {
  	return got_object_id_str(outbuf, &obj->id);
  }
  
  int
  got_object_get_type(struct got_object *obj)
  {
  	switch (obj->type) {
  	case GOT_OBJ_TYPE_COMMIT:
  	case GOT_OBJ_TYPE_TREE:
  	case GOT_OBJ_TYPE_BLOB:
  	case GOT_OBJ_TYPE_TAG:
  		return obj->type;
  	default:
  		abort();
  		break;
  	}
  
  	/* not reached */
  	return 0;
  }
  
  static const struct got_error *
  object_path(char **path, struct got_object_id *id, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *hex = NULL;
  	char *path_objects = got_repo_get_path_objects(repo);
  
  	*path = NULL;
  
  	if (path_objects == NULL)
  		return got_error_from_errno();
  
  	err = got_object_id_str(&hex, id);
  	if (err)
  		goto done;
  
  	if (asprintf(path, "%s/%.2x/%s", path_objects,
  	    id->sha1[0], hex + 2) == -1)
  		err = got_error_from_errno();
  
  done:
  	free(hex);
  	free(path_objects);
  	return err;
  }
  
  static const struct got_error *
  open_loose_object(int *fd, struct got_object *obj, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *path;
  
  	err = object_path(&path, &obj->id, repo);
  	if (err)
  		return err;
  	*fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
  	if (*fd == -1) {
  		err = got_error_from_errno();
  		goto done;
  	}
  done:
  	free(path);
  	return err;
  }
  
  static const struct got_error *
  get_packfile_path(char **path_packfile, struct got_packidx *packidx)
  {
  	size_t size;
  
  	/* Packfile path contains ".pack" instead of ".idx", so add one byte. */
  	size = strlen(packidx->path_packidx) + 2;
  	if (size < GOT_PACKFILE_NAMELEN + 1)
  		return got_error(GOT_ERR_BAD_PATH);
  
  	*path_packfile = calloc(size, sizeof(**path_packfile));
  	if (*path_packfile == NULL)
  		return got_error_from_errno();
  
  	/* Copy up to and excluding ".idx". */
  	if (strlcpy(*path_packfile, packidx->path_packidx,
  	    size - strlen(GOT_PACKIDX_SUFFIX) - 1) >= size)
  		return got_error(GOT_ERR_NO_SPACE);
  
  	if (strlcat(*path_packfile, GOT_PACKFILE_SUFFIX, size) >= size)
  		return got_error(GOT_ERR_NO_SPACE);
  
  	return NULL;
  }
  
  static const struct got_error *
  open_packed_object(struct got_object **obj, struct got_object_id *id,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_pack *pack = NULL;
  	struct got_packidx *packidx = NULL;
  	int idx;
  	char *path_packfile;
  
  	err = got_repo_search_packidx(&packidx, &idx, repo, id);
  	if (err)
  		return err;
  
  	err = get_packfile_path(&path_packfile, packidx);
  	if (err)
  		return err;
  
  	pack = got_repo_get_cached_pack(repo, path_packfile);
  	if (pack == NULL) {
  		err = got_repo_cache_pack(&pack, repo, path_packfile, packidx);
  		if (err)
  			goto done;
  	}
  
  	err = got_object_packed_read_privsep(obj, repo, pack, packidx, idx, id);
  	if (err)
  		goto done;
  
  	err = got_repo_cache_pack(NULL, repo, (*obj)->path_packfile, packidx);
  done:
  	free(path_packfile);
  	return err;
  }
  
  const struct got_error *
  got_object_open(struct got_object **obj, struct got_repository *repo,
      struct got_object_id *id)
  {
  	const struct got_error *err = NULL;
  	char *path;
  	int fd;
  
  	*obj = got_repo_get_cached_object(repo, id);
  	if (*obj != NULL) {
  		(*obj)->refcnt++;
  		return NULL;
  	}
  
  	err = open_packed_object(obj, id, repo);
  	if (err && err->code != GOT_ERR_NO_OBJ)
  		return err;
  	if (*obj) {
  		(*obj)->refcnt++;
  		return got_repo_cache_object(repo, id, *obj);
  	}
  
  	err = object_path(&path, id, repo);
  	if (err)
  		return err;
  
  	fd = open(path, O_RDONLY | O_NOFOLLOW, GOT_DEFAULT_FILE_MODE);
  	if (fd == -1) {
  		if (errno == ENOENT)
  			err = got_error(GOT_ERR_NO_OBJ);
  		else
  			err = got_error_from_errno();
  		goto done;
  	} else {
  		err = got_object_read_header_privsep(obj, repo, fd);
  		if (err)
  			goto done;
  		memcpy((*obj)->id.sha1, id->sha1, SHA1_DIGEST_LENGTH);
  	}
  
  	(*obj)->refcnt++;
  	err = got_repo_cache_object(repo, id, *obj);
  done:
  	free(path);
  	if (fd != -1)
  		close(fd);
  	return err;
  
  }
  
  const struct got_error *
  got_object_open_by_id_str(struct got_object **obj, struct got_repository *repo,
      const char *id_str)
  {
  	struct got_object_id id;
  
  	if (!got_parse_sha1_digest(id.sha1, id_str))
  		return got_error(GOT_ERR_BAD_OBJ_ID_STR);
  
  	return got_object_open(obj, repo, &id);
  }
  
  static const struct got_error *
  open_commit(struct got_commit_object **commit,
      struct got_repository *repo, struct got_object *obj, int check_cache)
  {
  	const struct got_error *err = NULL;
  
  	if (check_cache) {
  		*commit = got_repo_get_cached_commit(repo, &obj->id);
  		if (*commit != NULL) {
  			(*commit)->refcnt++;
  			return NULL;
  		}
  	} else
  		*commit = NULL;
  
  	if (obj->type != GOT_OBJ_TYPE_COMMIT)
  		return got_error(GOT_ERR_OBJ_TYPE);
  
  	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
  		struct got_pack *pack;
  		pack = got_repo_get_cached_pack(repo, obj->path_packfile);
  		if (pack == NULL) {
  			err = got_repo_cache_pack(&pack, repo,
  			    obj->path_packfile, NULL);
  			if (err)
  				return err;
  		}
  		err = got_object_read_packed_commit_privsep(commit, obj, pack);
  	} else {
  		int fd;
  		err = open_loose_object(&fd, obj, repo);
  		if (err)
  			return err;
  		err = got_object_read_commit_privsep(commit, obj, fd, repo);
  		close(fd);
  	}
  
  	if (err == NULL) {
  		(*commit)->refcnt++;
  		err = got_repo_cache_commit(repo, &obj->id, *commit);
  	}
  
  	return err;
  }
  
  const struct got_error *
  got_object_open_as_commit(struct got_commit_object **commit,
      struct got_repository *repo, struct got_object_id *id)
  {
  	const struct got_error *err;
  	struct got_object *obj;
  
  	*commit = got_repo_get_cached_commit(repo, id);
  	if (*commit != NULL) {
  		(*commit)->refcnt++;
  		return NULL;
  	}
  
  	err = got_object_open(&obj, repo, id);
  	if (err)
  		return err;
  	if (got_object_get_type(obj) != GOT_OBJ_TYPE_COMMIT) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = open_commit(commit, repo, obj, 0);
  done:
  	got_object_close(obj);
  	return err;
  }
  
  const struct got_error *
  got_object_commit_open(struct got_commit_object **commit,
      struct got_repository *repo, struct got_object *obj)
  {
  	return open_commit(commit, repo, obj, 1);
  }
  
  const struct got_error *
  got_object_qid_alloc(struct got_object_qid **qid, struct got_object_id *id)
  {
  	const struct got_error *err = NULL;
  
  	*qid = calloc(1, sizeof(**qid));
  	if (*qid == NULL)
  		return got_error_from_errno();
  
  	(*qid)->id = got_object_id_dup(id);
  	if ((*qid)->id == NULL) {
  		err = got_error_from_errno();
  		got_object_qid_free(*qid);
  		*qid = NULL;
  		return err;
  	}
  
  	return NULL;
  }
  
  static const struct got_error *
  open_tree(struct got_tree_object **tree,
      struct got_repository *repo, struct got_object *obj, int check_cache)
  {
  	const struct got_error *err = NULL;
  
  	if (check_cache) {
  		*tree = got_repo_get_cached_tree(repo, &obj->id);
  		if (*tree != NULL) {
  			(*tree)->refcnt++;
  			return NULL;
  		}
  	} else
  		*tree = NULL;
  
  	if (obj->type != GOT_OBJ_TYPE_TREE)
  		return got_error(GOT_ERR_OBJ_TYPE);
  
  	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
  		struct got_pack *pack;
  		pack = got_repo_get_cached_pack(repo, obj->path_packfile);
  		if (pack == NULL) {
  			err = got_repo_cache_pack(&pack, repo,
  			    obj->path_packfile, NULL);
  			if (err)
  				return err;
  		}
  		err = got_object_read_packed_tree_privsep(tree, obj, pack);
  	} else {
  		int fd;
  		err = open_loose_object(&fd, obj, repo);
  		if (err)
  			return err;
  		err = got_object_read_tree_privsep(tree, obj, fd, repo);
  		close(fd);
  	}
  
  	if (err == NULL) {
  		(*tree)->refcnt++;
  		err = got_repo_cache_tree(repo, &obj->id, *tree);
  	}
  
  	return err;
  }
  
  const struct got_error *
  got_object_open_as_tree(struct got_tree_object **tree,
      struct got_repository *repo, struct got_object_id *id)
  {
  	const struct got_error *err;
  	struct got_object *obj;
  
  	*tree = got_repo_get_cached_tree(repo, id);
  	if (*tree != NULL) {
  		(*tree)->refcnt++;
  		return NULL;
  	}
  
  	err = got_object_open(&obj, repo, id);
  	if (err)
  		return err;
  	if (got_object_get_type(obj) != GOT_OBJ_TYPE_TREE) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = open_tree(tree, repo, obj, 0);
  done:
  	got_object_close(obj);
  	return err;
  }
  
  const struct got_error *
  got_object_tree_open(struct got_tree_object **tree,
      struct got_repository *repo, struct got_object *obj)
  {
  	return open_tree(tree, repo, obj, 1);
  }
  
  const struct got_tree_entries *
  got_object_tree_get_entries(struct got_tree_object *tree)
  {
  	return &tree->entries;
  }
  
  static const struct got_error *
  read_packed_blob_privsep(size_t *size, int outfd, struct got_object *obj,
      struct got_pack *pack)
  {
  	const struct got_error *err = NULL;
  	int outfd_child;
  	int basefd, accumfd; /* temporary files for delta application */
  
  	basefd = got_opentempfd();
  	if (basefd == -1)
  		return got_error_from_errno();
  	accumfd = got_opentempfd();
  	if (accumfd == -1)
  		return got_error_from_errno();
  
  	outfd_child = dup(outfd);
  	if (outfd_child == -1)
  		return got_error_from_errno();
  
  	err = got_privsep_send_obj_req(pack->privsep_child->ibuf, -1, obj);
  	if (err)
  		return err;
  
  	err = got_privsep_send_blob_outfd(pack->privsep_child->ibuf,
  	    outfd_child);
  	if (err) {
  		close(outfd_child);
  		return err;
  	}
  	err = got_privsep_send_tmpfd(pack->privsep_child->ibuf,
  	    basefd);
  	if (err) {
  		close(basefd);
  		close(accumfd);
  		close(outfd_child);
  		return err;
  	}
  
  	err = got_privsep_send_tmpfd(pack->privsep_child->ibuf,
  	    accumfd);
  	if (err) {
  		close(accumfd);
  		close(outfd_child);
  		return err;
  	}
  
  	err = got_privsep_recv_blob(size, pack->privsep_child->ibuf);
  	if (err)
  		return err;
  
  	if (lseek(outfd, SEEK_SET, 0) == -1)
  		err = got_error_from_errno();
  
  	return err;
  }
  
  const struct got_error *
  got_object_blob_open(struct got_blob_object **blob,
      struct got_repository *repo, struct got_object *obj, size_t blocksize)
  {
  	const struct got_error *err = NULL;
  	int outfd;
  	size_t size;
  	struct stat sb;
  
  	if (obj->type != GOT_OBJ_TYPE_BLOB)
  		return got_error(GOT_ERR_OBJ_TYPE);
  
  	if (blocksize < obj->hdrlen)
  		return got_error(GOT_ERR_NO_SPACE);
  
  	*blob = calloc(1, sizeof(**blob));
  	if (*blob == NULL)
  		return got_error_from_errno();
  
  	outfd = got_opentempfd();
  	if (outfd == -1)
  		return got_error_from_errno();
  
  	(*blob)->read_buf = malloc(blocksize);
  	if ((*blob)->read_buf == NULL) {
  		err = got_error_from_errno();
  		goto done;
  	}
  	if (obj->flags & GOT_OBJ_FLAG_PACKED) {
  		struct got_pack *pack;
  		pack = got_repo_get_cached_pack(repo, obj->path_packfile);
  		if (pack == NULL) {
  			err = got_repo_cache_pack(&pack, repo,
  			    obj->path_packfile, NULL);
  			if (err)
  				goto done;
  		}
  		err = read_packed_blob_privsep(&size, outfd, obj, pack);
  		if (err)
  			goto done;
  		obj->size = size;
  	} else {
  		int infd;
  
  		err = open_loose_object(&infd, obj, repo);
  		if (err)
  			goto done;
  
  		err = got_object_read_blob_privsep(&size, outfd, infd, repo);
  		close(infd);
  		if (err)
  			goto done;
  
  		if (size != obj->hdrlen + obj->size) {
  			err = got_error(GOT_ERR_PRIVSEP_LEN);
  			goto done;
  		}
  	}
  
  	if (fstat(outfd, &sb) == -1) {
  		err = got_error_from_errno();
  		goto done;
  	}
  
  	if (sb.st_size != obj->hdrlen + obj->size) {
  		err = got_error(GOT_ERR_PRIVSEP_LEN);
  		goto done;
  	}
  
  	(*blob)->f = fdopen(outfd, "rb");
  	if ((*blob)->f == NULL) {
  		err = got_error_from_errno();
  		close(outfd);
  		goto done;
  	}
  
  	(*blob)->hdrlen = obj->hdrlen;
  	(*blob)->blocksize = blocksize;
  	memcpy(&(*blob)->id.sha1, obj->id.sha1, SHA1_DIGEST_LENGTH);
  
  done:
  	if (err) {
  		if (*blob) {
  			if ((*blob)->f)
  				fclose((*blob)->f);
  			free((*blob)->read_buf);
  			free(*blob);
  			*blob = NULL;
  		} else if (outfd != -1)
  			close(outfd);
  	}
  	return err;
  }
  
  const struct got_error *
  got_object_open_as_blob(struct got_blob_object **blob,
      struct got_repository *repo, struct got_object_id *id,
      size_t blocksize)
  {
  	const struct got_error *err;
  	struct got_object *obj;
  
  	*blob = NULL;
  
  	err = got_object_open(&obj, repo, id);
  	if (err)
  		return err;
  	if (got_object_get_type(obj) != GOT_OBJ_TYPE_BLOB) {
  		err = got_error(GOT_ERR_OBJ_TYPE);
  		goto done;
  	}
  
  	err = got_object_blob_open(blob, repo, obj, blocksize);
  done:
  	got_object_close(obj);
  	return err;
  }
  
  void
  got_object_blob_close(struct got_blob_object *blob)
  {
  	free(blob->read_buf);
  	fclose(blob->f);
  	free(blob);
  }
  
  char *
  got_object_blob_id_str(struct got_blob_object *blob, char *buf, size_t size)
  {
  	return got_sha1_digest_to_str(blob->id.sha1, buf, size);
  }
  
  size_t
  got_object_blob_get_hdrlen(struct got_blob_object *blob)
  {
  	return blob->hdrlen;
  }
  
  const uint8_t *
  got_object_blob_get_read_buf(struct got_blob_object *blob)
  {
  	return blob->read_buf;
  }
  
  const struct got_error *
  got_object_blob_read_block(size_t *outlenp, struct got_blob_object *blob)
  {
  	size_t n;
  
  	n = fread(blob->read_buf, 1, blob->blocksize, blob->f);
  	if (n == 0 && ferror(blob->f))
  		return got_ferror(blob->f, GOT_ERR_IO);
  	*outlenp = n;
  	return NULL;
  }
  
  const struct got_error *
  got_object_blob_dump_to_file(size_t *total_len, size_t *nlines,
      FILE *outfile, struct got_blob_object *blob)
  {
  	const struct got_error *err = NULL;
  	size_t len, hdrlen;
  	const uint8_t *buf;
  	int i;
  
  	if (total_len)
  		*total_len = 0;
  	if (nlines)
  		*nlines = 0;
  
  	hdrlen = got_object_blob_get_hdrlen(blob);
  	do {
  		err = got_object_blob_read_block(&len, blob);
  		if (err)
  			return err;
  		if (len == 0)
  			break;
  		if (total_len)
  			*total_len += len;
  		buf = got_object_blob_get_read_buf(blob);
  		if (nlines) {
  			for (i = 0; i < len; i++) {
  				if (buf[i] == '\n')
  					(*nlines)++;
  			}
  		}
  		/* Skip blob object header first time around. */
  		fwrite(buf + hdrlen, len - hdrlen, 1, outfile);
  		hdrlen = 0;
  	} while (len != 0);
  
  	fflush(outfile);
  	rewind(outfile);
  
  	return NULL;
  }
  
  static struct got_tree_entry *
  find_entry_by_name(struct got_tree_object *tree, const char *name, size_t len)
  {
  	struct got_tree_entry *te;
  
  	SIMPLEQ_FOREACH(te, &tree->entries.head, entry) {
  		if (strncmp(te->name, name, len) == 0 && te->name[len] == '\0')
  			return te;
  	}
  	return NULL;
  }
  
  const struct got_error *
  got_object_id_by_path(struct got_object_id **id, struct got_repository *repo,
      struct got_object_id *commit_id, const char *path)
  {
  	const struct got_error *err = NULL;
  	struct got_commit_object *commit = NULL;
  	struct got_tree_object *tree = NULL;
  	struct got_tree_entry *te = NULL;
  	const char *seg, *s;
  	size_t seglen, len = strlen(path);
  
  	*id = NULL;
  
  	/* We are expecting an absolute in-repository path. */
  	if (path[0] != '/')
  		return got_error(GOT_ERR_NOT_ABSPATH);
  
  	err = got_object_open_as_commit(&commit, repo, commit_id);
  	if (err)
  		goto done;
  
  	/* Handle opening of root of commit's tree. */
  	if (path[1] == '\0') {
  		*id = got_object_id_dup(commit->tree_id);
  		if (*id == NULL)
  			err = got_error_from_errno();
  		goto done;
  	}
  
  	err = got_object_open_as_tree(&tree, repo, commit->tree_id);
  	if (err)
  		goto done;
  
  	s = path;
  	s++; /* skip leading '/' */
  	len--;
  	seg = s;
  	seglen = 0;
  	while (len > 0) {
  		struct got_tree_object *next_tree;
  
  		if (*s != '/') {
  			s++;
  			len--;
  			seglen++;
  			if (*s)
  				continue;
  		}
  
  		te = find_entry_by_name(tree, seg, seglen);
  		if (te == NULL) {
  			err = got_error(GOT_ERR_NO_OBJ);
  			goto done;
  		}
  
  		if (len == 0)
  			break;
  
  		seg = s + 1;
  		seglen = 0;
  		s++;
  		len--;
  		if (*s) {
  			err = got_object_open_as_tree(&next_tree, repo,
  			    te->id);
  			te = NULL;
  			if (err)
  				goto done;
  			got_object_tree_close(tree);
  			tree = next_tree;
  		}
  	}
  
  	if (te) {
  		*id = got_object_id_dup(te->id);
  		if (*id == NULL)
  			return got_error_from_errno();
  	} else
  		err = got_error(GOT_ERR_NO_OBJ);
  done:
  	if (commit)
  		got_object_commit_close(commit);
  	if (tree)
  		got_object_tree_close(tree);
  	return err;
  }
  
  const struct got_error *
  got_object_tree_path_changed(int *changed,
      struct got_tree_object *tree01, struct got_tree_object *tree02,
      const char *path, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
  	struct got_tree_entry *te1 = NULL, *te2 = NULL;
  	const char *seg, *s;
  	size_t seglen, len = strlen(path);
  
  	*changed = 0;
  
  	/* We are expecting an absolute in-repository path. */
  	if (path[0] != '/')
  		return got_error(GOT_ERR_NOT_ABSPATH);
  
  	/* We not do support comparing the root path. */
  	if (path[1] == '\0')
  		return got_error(GOT_ERR_BAD_PATH);
  
  	tree1 = tree01;
  	tree2 = tree02;
  	s = path;
  	s++; /* skip leading '/' */
  	len--;
  	seg = s;
  	seglen = 0;
  	while (len > 0) {
  		struct got_tree_object *next_tree1, *next_tree2;
  
  		if (*s != '/') {
  			s++;
  			len--;
  			seglen++;
  			if (*s)
  				continue;
  		}
  
  		te1 = find_entry_by_name(tree1, seg, seglen);
  		if (te1 == NULL) {
  			err = got_error(GOT_ERR_NO_OBJ);
  			goto done;
  		}
  
  		te2 = find_entry_by_name(tree2, seg, seglen);
  		if (te2 == NULL) {
  			*changed = 1;
  			goto done;
  		}
  
  		if (te1->mode != te2->mode) {
  			*changed = 1;
  			goto done;
  		}
  
  		if (got_object_id_cmp(te1->id, te2->id) == 0) {
  			*changed = 0;
  			goto done;
  		}
  
  		if (len == 0) { /* final path element */
  			*changed = 1;
  			goto done;
  		}
  
  		seg = s + 1;
  		s++;
  		len--;
  		seglen = 0;
  		if (*s) {
  			err = got_object_open_as_tree(&next_tree1, repo,
  			    te1->id);
  			te1 = NULL;
  			if (err)
  				goto done;
  			if (tree1 != tree01)
  				got_object_tree_close(tree1);
  			tree1 = next_tree1;
  
  			err = got_object_open_as_tree(&next_tree2, repo,
  			    te2->id);
  			te2 = NULL;
  			if (err)
  				goto done;
  			if (tree2 != tree02)
  				got_object_tree_close(tree2);
  			tree2 = next_tree2;
  		}
  	}
  done:
  	if (tree1 && tree1 != tree01)
  		got_object_tree_close(tree1);
  	if (tree2 && tree2 != tree02)
  		got_object_tree_close(tree2);
  	return err;
  }
  

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