thodg/got/lib/repository.c

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• Hash : d188eb19
  Author :
  Date : 2022-06-15T14:26:34
  

  remove pointless assignment at the end of got_repo_pack_fds_close()

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• lib/repository.c

• /*
   * Copyright (c) 2018, 2019, 2020 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/queue.h>
  #include <sys/tree.h>
  #include <sys/uio.h>
  #include <sys/socket.h>
  #include <sys/stat.h>
  #include <sys/mman.h>
  #include <sys/resource.h>
  
  #include <ctype.h>
  #include <endian.h>
  #include <fcntl.h>
  #include <fnmatch.h>
  #include <limits.h>
  #include <dirent.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <sha1.h>
  #include <string.h>
  #include <time.h>
  #include <unistd.h>
  #include <zlib.h>
  #include <errno.h>
  #include <libgen.h>
  #include <stdint.h>
  #include <imsg.h>
  #include <uuid.h>
  
  #include "bloom.h"
  
  #include "got_error.h"
  #include "got_reference.h"
  #include "got_repository.h"
  #include "got_path.h"
  #include "got_cancel.h"
  #include "got_object.h"
  #include "got_opentemp.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_privsep.h"
  #include "got_lib_sha1.h"
  #include "got_lib_object_cache.h"
  #include "got_lib_repository.h"
  #include "got_lib_gotconfig.h"
  
  #ifndef nitems
  #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
  #endif
  
  #define GOT_PACK_NUM_TEMPFILES		GOT_PACK_CACHE_SIZE * 2
  
  RB_PROTOTYPE(got_packidx_bloom_filter_tree, got_packidx_bloom_filter, entry,
      got_packidx_bloom_filter_cmp);
  
  const char *
  got_repo_get_path(struct got_repository *repo)
  {
  	return repo->path;
  }
  
  const char *
  got_repo_get_path_git_dir(struct got_repository *repo)
  {
  	return repo->path_git_dir;
  }
  
  int
  got_repo_get_fd(struct got_repository *repo)
  {
  	return repo->gitdir_fd;
  }
  
  const char *
  got_repo_get_gitconfig_author_name(struct got_repository *repo)
  {
  	return repo->gitconfig_author_name;
  }
  
  const char *
  got_repo_get_gitconfig_author_email(struct got_repository *repo)
  {
  	return repo->gitconfig_author_email;
  }
  
  const char *
  got_repo_get_global_gitconfig_author_name(struct got_repository *repo)
  {
  	return repo->global_gitconfig_author_name;
  }
  
  const char *
  got_repo_get_global_gitconfig_author_email(struct got_repository *repo)
  {
  	return repo->global_gitconfig_author_email;
  }
  
  const char *
  got_repo_get_gitconfig_owner(struct got_repository *repo)
  {
  	return repo->gitconfig_owner;
  }
  
  void
  got_repo_get_gitconfig_extensions(char ***extensions, int *nextensions,
      struct got_repository *repo)
  {
  	*extensions = repo->extensions;
  	*nextensions = repo->nextensions;
  }
  
  int
  got_repo_is_bare(struct got_repository *repo)
  {
  	return (strcmp(repo->path, repo->path_git_dir) == 0);
  }
  
  static char *
  get_path_git_child(struct got_repository *repo, const char *basename)
  {
  	char *path_child;
  
  	if (asprintf(&path_child, "%s/%s", repo->path_git_dir,
  	    basename) == -1)
  		return NULL;
  
  	return path_child;
  }
  
  char *
  got_repo_get_path_objects(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_OBJECTS_DIR);
  }
  
  char *
  got_repo_get_path_objects_pack(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_OBJECTS_PACK_DIR);
  }
  
  char *
  got_repo_get_path_refs(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_REFS_DIR);
  }
  
  char *
  got_repo_get_path_packed_refs(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_PACKED_REFS_FILE);
  }
  
  static char *
  get_path_head(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_HEAD_FILE);
  }
  
  char *
  got_repo_get_path_gitconfig(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_GITCONFIG);
  }
  
  char *
  got_repo_get_path_gotconfig(struct got_repository *repo)
  {
  	return get_path_git_child(repo, GOT_GOTCONFIG_FILENAME);
  }
  
  const struct got_gotconfig *
  got_repo_get_gotconfig(struct got_repository *repo)
  {
  	return repo->gotconfig;
  }
  
  void
  got_repo_get_gitconfig_remotes(int *nremotes,
      const struct got_remote_repo **remotes, struct got_repository *repo)
  {
  	*nremotes = repo->ngitconfig_remotes;
  	*remotes = repo->gitconfig_remotes;
  }
  
  static int
  is_git_repo(struct got_repository *repo)
  {
  	const char *path_git = got_repo_get_path_git_dir(repo);
  	char *path_objects = got_repo_get_path_objects(repo);
  	char *path_refs = got_repo_get_path_refs(repo);
  	char *path_head = get_path_head(repo);
  	int ret = 0;
  	struct stat sb;
  	struct got_reference *head_ref;
  
  	if (lstat(path_git, &sb) == -1)
  		goto done;
  	if (!S_ISDIR(sb.st_mode))
  		goto done;
  
  	if (lstat(path_objects, &sb) == -1)
  		goto done;
  	if (!S_ISDIR(sb.st_mode))
  		goto done;
  
  	if (lstat(path_refs, &sb) == -1)
  		goto done;
  	if (!S_ISDIR(sb.st_mode))
  		goto done;
  
  	if (lstat(path_head, &sb) == -1)
  		goto done;
  	if (!S_ISREG(sb.st_mode))
  		goto done;
  
  	/* Check if the HEAD reference can be opened. */
  	if (got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0) != NULL)
  		goto done;
  	got_ref_close(head_ref);
  
  	ret = 1;
  done:
  	free(path_objects);
  	free(path_refs);
  	free(path_head);
  	return ret;
  
  }
  
  const struct got_error *
  got_repo_pack_fds_open(int **pack_fds)
  {
  	const struct got_error *err = NULL;
  	int i, pack_fds_tmp[GOT_PACK_NUM_TEMPFILES];
  
  	*pack_fds = calloc(GOT_PACK_NUM_TEMPFILES, sizeof(**pack_fds));
  	if (*pack_fds == NULL)
  		return got_error_from_errno("calloc");
  
  	for (i = 0; i < GOT_PACK_NUM_TEMPFILES; i++) {
  		pack_fds_tmp[i] = got_opentempfd();
  		if (pack_fds_tmp[i] == -1) {
  			err = got_error_from_errno("got_opentempfd");
  			got_repo_pack_fds_close(pack_fds_tmp);
  			return err;
  		}
  	}
  	memcpy(*pack_fds, pack_fds_tmp, sizeof(pack_fds_tmp));
  	return err;
  }
  
  const struct got_error *
  got_repo_pack_fds_close(int *pack_fds)
  {
  	const struct got_error *err = NULL;
  	int i;
  
  	for (i = 0; i < GOT_PACK_NUM_TEMPFILES; i++) {
  		if (pack_fds[i] == -1)
  			continue;
  		if (close(pack_fds[i]) == -1) {
  			err = got_error_from_errno("close");
  			break;
  		}
  	}
  	free(pack_fds);
  	return err;
  }
  
  const struct got_error *
  got_repo_cache_object(struct got_repository *repo, struct got_object_id *id,
      struct got_object *obj)
  {
  #ifndef GOT_NO_OBJ_CACHE
  	const struct got_error *err = NULL;
  	err = got_object_cache_add(&repo->objcache, id, obj);
  	if (err) {
  		if (err->code == GOT_ERR_OBJ_EXISTS ||
  		    err->code == GOT_ERR_OBJ_TOO_LARGE)
  			err = NULL;
  		return err;
  	}
  	obj->refcnt++;
  #endif
  	return NULL;
  }
  
  struct got_object *
  got_repo_get_cached_object(struct got_repository *repo,
      struct got_object_id *id)
  {
  	return (struct got_object *)got_object_cache_get(&repo->objcache, id);
  }
  
  const struct got_error *
  got_repo_cache_tree(struct got_repository *repo, struct got_object_id *id,
      struct got_tree_object *tree)
  {
  #ifndef GOT_NO_OBJ_CACHE
  	const struct got_error *err = NULL;
  	err = got_object_cache_add(&repo->treecache, id, tree);
  	if (err) {
  		if (err->code == GOT_ERR_OBJ_EXISTS ||
  		    err->code == GOT_ERR_OBJ_TOO_LARGE)
  			err = NULL;
  		return err;
  	}
  	tree->refcnt++;
  #endif
  	return NULL;
  }
  
  struct got_tree_object *
  got_repo_get_cached_tree(struct got_repository *repo,
      struct got_object_id *id)
  {
  	return (struct got_tree_object *)got_object_cache_get(
  	    &repo->treecache, id);
  }
  
  const struct got_error *
  got_repo_cache_commit(struct got_repository *repo, struct got_object_id *id,
      struct got_commit_object *commit)
  {
  #ifndef GOT_NO_OBJ_CACHE
  	const struct got_error *err = NULL;
  	err = got_object_cache_add(&repo->commitcache, id, commit);
  	if (err) {
  		if (err->code == GOT_ERR_OBJ_EXISTS ||
  		    err->code == GOT_ERR_OBJ_TOO_LARGE)
  			err = NULL;
  		return err;
  	}
  	commit->refcnt++;
  #endif
  	return NULL;
  }
  
  struct got_commit_object *
  got_repo_get_cached_commit(struct got_repository *repo,
      struct got_object_id *id)
  {
  	return (struct got_commit_object *)got_object_cache_get(
  	    &repo->commitcache, id);
  }
  
  const struct got_error *
  got_repo_cache_tag(struct got_repository *repo, struct got_object_id *id,
      struct got_tag_object *tag)
  {
  #ifndef GOT_NO_OBJ_CACHE
  	const struct got_error *err = NULL;
  	err = got_object_cache_add(&repo->tagcache, id, tag);
  	if (err) {
  		if (err->code == GOT_ERR_OBJ_EXISTS ||
  		    err->code == GOT_ERR_OBJ_TOO_LARGE)
  			err = NULL;
  		return err;
  	}
  	tag->refcnt++;
  #endif
  	return NULL;
  }
  
  struct got_tag_object *
  got_repo_get_cached_tag(struct got_repository *repo, struct got_object_id *id)
  {
  	return (struct got_tag_object *)got_object_cache_get(
  	    &repo->tagcache, id);
  }
  
  const struct got_error *
  got_repo_cache_raw_object(struct got_repository *repo, struct got_object_id *id,
      struct got_raw_object *raw)
  {
  #ifndef GOT_NO_OBJ_CACHE
  	const struct got_error *err = NULL;
  	err = got_object_cache_add(&repo->rawcache, id, raw);
  	if (err) {
  		if (err->code == GOT_ERR_OBJ_EXISTS ||
  		    err->code == GOT_ERR_OBJ_TOO_LARGE)
  			err = NULL;
  		return err;
  	}
  	raw->refcnt++;
  #endif
  	return NULL;
  }
  
  
  struct got_raw_object *
  got_repo_get_cached_raw_object(struct got_repository *repo,
      struct got_object_id *id)
  {
  	return (struct got_raw_object *)got_object_cache_get(&repo->rawcache, id);
  }
  
  
  static const struct got_error *
  open_repo(struct got_repository *repo, const char *path)
  {
  	const struct got_error *err = NULL;
  
  	repo->gitdir_fd = -1;
  
  	/* bare git repository? */
  	repo->path_git_dir = strdup(path);
  	if (repo->path_git_dir == NULL)
  		return got_error_from_errno("strdup");
  	if (is_git_repo(repo)) {
  		repo->path = strdup(repo->path_git_dir);
  		if (repo->path == NULL) {
  			err = got_error_from_errno("strdup");
  			goto done;
  		}
  		repo->gitdir_fd = open(repo->path_git_dir,
  		    O_DIRECTORY | O_CLOEXEC);
  		if (repo->gitdir_fd == -1) {
  			err = got_error_from_errno2("open",
  			    repo->path_git_dir);
  			goto done;
  		}
  		return NULL;
  	}
  
  	/* git repository with working tree? */
  	free(repo->path_git_dir);
  	repo->path_git_dir = NULL;
  	if (asprintf(&repo->path_git_dir, "%s/%s", path, GOT_GIT_DIR) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  	if (is_git_repo(repo)) {
  		repo->path = strdup(path);
  		if (repo->path == NULL) {
  			err = got_error_from_errno("strdup");
  			goto done;
  		}
  		repo->gitdir_fd = open(repo->path_git_dir,
  		    O_DIRECTORY | O_CLOEXEC);
  		if (repo->gitdir_fd == -1) {
  			err = got_error_from_errno2("open",
  			    repo->path_git_dir);
  			goto done;
  		}
  		return NULL;
  	}
  
  	err = got_error(GOT_ERR_NOT_GIT_REPO);
  done:
  	if (err) {
  		free(repo->path);
  		repo->path = NULL;
  		free(repo->path_git_dir);
  		repo->path_git_dir = NULL;
  		if (repo->gitdir_fd != -1)
  			close(repo->gitdir_fd);
  		repo->gitdir_fd = -1;
  
  	}
  	return err;
  }
  
  static const struct got_error *
  parse_gitconfig_file(int *gitconfig_repository_format_version,
      char **gitconfig_author_name, char **gitconfig_author_email,
      struct got_remote_repo **remotes, int *nremotes,
      char **gitconfig_owner, char ***extensions, int *nextensions,
      const char *gitconfig_path)
  {
  	const struct got_error *err = NULL, *child_err = NULL;
  	int fd = -1;
  	int imsg_fds[2] = { -1, -1 };
  	pid_t pid;
  	struct imsgbuf *ibuf;
  
  	*gitconfig_repository_format_version = 0;
  	if (extensions)
  		*extensions = NULL;
  	if (nextensions)
  		*nextensions = 0;
  	*gitconfig_author_name = NULL;
  	*gitconfig_author_email = NULL;
  	if (remotes)
  		*remotes = NULL;
  	if (nremotes)
  		*nremotes = 0;
  	if (gitconfig_owner)
  		*gitconfig_owner = NULL;
  
  	fd = open(gitconfig_path, O_RDONLY | O_CLOEXEC);
  	if (fd == -1) {
  		if (errno == ENOENT)
  			return NULL;
  		return got_error_from_errno2("open", gitconfig_path);
  	}
  
  	ibuf = calloc(1, sizeof(*ibuf));
  	if (ibuf == NULL) {
  		err = got_error_from_errno("calloc");
  		goto done;
  	}
  
  	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_fds) == -1) {
  		err = got_error_from_errno("socketpair");
  		goto done;
  	}
  
  	pid = fork();
  	if (pid == -1) {
  		err = got_error_from_errno("fork");
  		goto done;
  	} else if (pid == 0) {
  		got_privsep_exec_child(imsg_fds, GOT_PATH_PROG_READ_GITCONFIG,
  		    gitconfig_path);
  		/* not reached */
  	}
  
  	if (close(imsg_fds[1]) == -1) {
  		err = got_error_from_errno("close");
  		goto done;
  	}
  	imsg_fds[1] = -1;
  	imsg_init(ibuf, imsg_fds[0]);
  
  	err = got_privsep_send_gitconfig_parse_req(ibuf, fd);
  	if (err)
  		goto done;
  	fd = -1;
  
  	err = got_privsep_send_gitconfig_repository_format_version_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gitconfig_int(
  	    gitconfig_repository_format_version, ibuf);
  	if (err)
  		goto done;
  
  	if (extensions && nextensions) {
  		err = got_privsep_send_gitconfig_repository_extensions_req(
  		    ibuf);
  		if (err)
  			goto done;
  		err = got_privsep_recv_gitconfig_int(nextensions, ibuf);
  		if (err)
  			goto done;
  		if (*nextensions > 0) {
  			int i;
  			*extensions = calloc(*nextensions, sizeof(char *));
  			if (*extensions == NULL) {
  				err = got_error_from_errno("calloc");
  				goto done;
  			}
  			for (i = 0; i < *nextensions; i++) {
  				char *ext;
  				err = got_privsep_recv_gitconfig_str(&ext,
  				    ibuf);
  				if (err)
  					goto done;
  				(*extensions)[i] = ext;
  			}
  		}
  	}
  
  	err = got_privsep_send_gitconfig_author_name_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gitconfig_str(gitconfig_author_name, ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_send_gitconfig_author_email_req(ibuf);
  	if (err)
  		goto done;
  
  	err = got_privsep_recv_gitconfig_str(gitconfig_author_email, ibuf);
  	if (err)
  		goto done;
  
  	if (remotes && nremotes) {
  		err = got_privsep_send_gitconfig_remotes_req(ibuf);
  		if (err)
  			goto done;
  
  		err = got_privsep_recv_gitconfig_remotes(remotes,
  		    nremotes, ibuf);
  		if (err)
  			goto done;
  	}
  
  	if (gitconfig_owner) {
  		err = got_privsep_send_gitconfig_owner_req(ibuf);
  		if (err)
  			goto done;
  		err = got_privsep_recv_gitconfig_str(gitconfig_owner, ibuf);
  		if (err)
  			goto done;
  	}
  
  	err = got_privsep_send_stop(imsg_fds[0]);
  	child_err = got_privsep_wait_for_child(pid);
  	if (child_err && err == NULL)
  		err = child_err;
  done:
  	if (imsg_fds[0] != -1 && close(imsg_fds[0]) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (imsg_fds[1] != -1 && close(imsg_fds[1]) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (fd != -1 && close(fd) == -1 && err == NULL)
  		err = got_error_from_errno2("close", gitconfig_path);
  	free(ibuf);
  	return err;
  }
  
  static const struct got_error *
  read_gitconfig(struct got_repository *repo, const char *global_gitconfig_path)
  {
  	const struct got_error *err = NULL;
  	char *repo_gitconfig_path = NULL;
  
  	if (global_gitconfig_path) {
  		/* Read settings from ~/.gitconfig. */
  		int dummy_repo_version;
  		err = parse_gitconfig_file(&dummy_repo_version,
  		    &repo->global_gitconfig_author_name,
  		    &repo->global_gitconfig_author_email,
  		    NULL, NULL, NULL, NULL, NULL, global_gitconfig_path);
  		if (err)
  			return err;
  	}
  
  	/* Read repository's .git/config file. */
  	repo_gitconfig_path = got_repo_get_path_gitconfig(repo);
  	if (repo_gitconfig_path == NULL)
  		return got_error_from_errno("got_repo_get_path_gitconfig");
  
  	err = parse_gitconfig_file(&repo->gitconfig_repository_format_version,
  	    &repo->gitconfig_author_name, &repo->gitconfig_author_email,
  	    &repo->gitconfig_remotes, &repo->ngitconfig_remotes,
  	    &repo->gitconfig_owner, &repo->extensions, &repo->nextensions,
  	    repo_gitconfig_path);
  	if (err)
  		goto done;
  done:
  	free(repo_gitconfig_path);
  	return err;
  }
  
  static const struct got_error *
  read_gotconfig(struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *gotconfig_path;
  
  	gotconfig_path = got_repo_get_path_gotconfig(repo);
  	if (gotconfig_path == NULL)
  		return got_error_from_errno("got_repo_get_path_gotconfig");
  
  	err = got_gotconfig_read(&repo->gotconfig, gotconfig_path);
  	free(gotconfig_path);
  	return err;
  }
  
  /* Supported repository format extensions. */
  static const char *const repo_extensions[] = {
  	"noop",			/* Got supports repository format version 1. */
  	"preciousObjects",	/* Supported by gotadmin cleanup. */
  	"worktreeConfig",	/* Got does not care about Git work trees. */
  };
  
  const struct got_error *
  got_repo_open(struct got_repository **repop, const char *path,
      const char *global_gitconfig_path, int *pack_fds)
  {
  	struct got_repository *repo = NULL;
  	const struct got_error *err = NULL;
  	char *repo_path = NULL;
  	size_t i, j = 0;
  	struct rlimit rl;
  
  	*repop = NULL;
  
  	if (getrlimit(RLIMIT_NOFILE, &rl) == -1)
  		return got_error_from_errno("getrlimit");
  
  	repo = calloc(1, sizeof(*repo));
  	if (repo == NULL)
  		return got_error_from_errno("calloc");
  
  	RB_INIT(&repo->packidx_bloom_filters);
  	TAILQ_INIT(&repo->packidx_paths);
  
  	for (i = 0; i < nitems(repo->privsep_children); i++) {
  		memset(&repo->privsep_children[i], 0,
  		    sizeof(repo->privsep_children[0]));
  		repo->privsep_children[i].imsg_fd = -1;
  	}
  
  	err = got_object_cache_init(&repo->objcache,
  	    GOT_OBJECT_CACHE_TYPE_OBJ);
  	if (err)
  		goto done;
  	err = got_object_cache_init(&repo->treecache,
  	    GOT_OBJECT_CACHE_TYPE_TREE);
  	if (err)
  		goto done;
  	err = got_object_cache_init(&repo->commitcache,
  	    GOT_OBJECT_CACHE_TYPE_COMMIT);
  	if (err)
  		goto done;
  	err = got_object_cache_init(&repo->tagcache,
  	    GOT_OBJECT_CACHE_TYPE_TAG);
  	if (err)
  		goto done;
  	err = got_object_cache_init(&repo->rawcache,
  	    GOT_OBJECT_CACHE_TYPE_RAW);
  	if (err)
  		goto done;
  
  	repo->pack_cache_size = GOT_PACK_CACHE_SIZE;
  	if (repo->pack_cache_size > rl.rlim_cur / 8)
  		repo->pack_cache_size = rl.rlim_cur / 8;
  	for (i = 0; i < nitems(repo->packs); i++) {
  		if (i < repo->pack_cache_size) {
  			repo->packs[i].basefd = pack_fds[j++];
  			repo->packs[i].accumfd = pack_fds[j++];
  		} else {
  			repo->packs[i].basefd = -1;
  			repo->packs[i].accumfd = -1;
  		}
  	}
  
  	repo_path = realpath(path, NULL);
  	if (repo_path == NULL) {
  		err = got_error_from_errno2("realpath", path);
  		goto done;
  	}
  
  	for (;;) {
  		char *parent_path;
  
  		err = open_repo(repo, repo_path);
  		if (err == NULL)
  			break;
  		if (err->code != GOT_ERR_NOT_GIT_REPO)
  			goto done;
  		if (repo_path[0] == '/' && repo_path[1] == '\0') {
  			err = got_error(GOT_ERR_NOT_GIT_REPO);
  			goto done;
  		}
  		err = got_path_dirname(&parent_path, repo_path);
  		if (err)
  			goto done;
  		free(repo_path);
  		repo_path = parent_path;
  	}
  
  	err = read_gotconfig(repo);
  	if (err)
  		goto done;
  
  	err = read_gitconfig(repo, global_gitconfig_path);
  	if (err)
  		goto done;
  	if (repo->gitconfig_repository_format_version != 0)
  		err = got_error_path(path, GOT_ERR_GIT_REPO_FORMAT);
  	for (i = 0; i < repo->nextensions; i++) {
  		char *ext = repo->extensions[i];
  		int j, supported = 0;
  		for (j = 0; j < nitems(repo_extensions); j++) {
  			if (strcmp(ext, repo_extensions[j]) == 0) {
  				supported = 1;
  				break;
  			}
  		}
  		if (!supported) {
  			err = got_error_path(ext, GOT_ERR_GIT_REPO_EXT);
  			goto done;
  		}
  	}
  
  	err = got_repo_list_packidx(&repo->packidx_paths, repo);
  done:
  	if (err)
  		got_repo_close(repo);
  	else
  		*repop = repo;
  	free(repo_path);
  	return err;
  }
  
  const struct got_error *
  got_repo_close(struct got_repository *repo)
  {
  	const struct got_error *err = NULL, *child_err;
  	struct got_packidx_bloom_filter *bf;
  	struct got_pathlist_entry *pe;
  	size_t i;
  
  	for (i = 0; i < repo->pack_cache_size; i++) {
  		if (repo->packidx_cache[i] == NULL)
  			break;
  		got_packidx_close(repo->packidx_cache[i]);
  	}
  
  	while ((bf = RB_MIN(got_packidx_bloom_filter_tree,
  	    &repo->packidx_bloom_filters))) {
  		RB_REMOVE(got_packidx_bloom_filter_tree,
  		    &repo->packidx_bloom_filters, bf);
  		free(bf->bloom);
  		free(bf);
  	}
  
  	for (i = 0; i < repo->pack_cache_size; i++)
  		if (repo->packs[i].path_packfile)
  			if (repo->packs[i].path_packfile)
  				got_pack_close(&repo->packs[i]);
  
  	free(repo->path);
  	free(repo->path_git_dir);
  
  	got_object_cache_close(&repo->objcache);
  	got_object_cache_close(&repo->treecache);
  	got_object_cache_close(&repo->commitcache);
  	got_object_cache_close(&repo->tagcache);
  	got_object_cache_close(&repo->rawcache);
  
  	for (i = 0; i < nitems(repo->privsep_children); i++) {
  		if (repo->privsep_children[i].imsg_fd == -1)
  			continue;
  		imsg_clear(repo->privsep_children[i].ibuf);
  		free(repo->privsep_children[i].ibuf);
  		err = got_privsep_send_stop(repo->privsep_children[i].imsg_fd);
  		child_err = got_privsep_wait_for_child(
  		    repo->privsep_children[i].pid);
  		if (child_err && err == NULL)
  			err = child_err;
  		if (close(repo->privsep_children[i].imsg_fd) == -1 &&
  		    err == NULL)
  			err = got_error_from_errno("close");
  	}
  
  	if (repo->gitdir_fd != -1 && close(repo->gitdir_fd) == -1 &&
  	    err == NULL)
  		err = got_error_from_errno("close");
  
  	if (repo->gotconfig)
  		got_gotconfig_free(repo->gotconfig);
  	free(repo->gitconfig_author_name);
  	free(repo->gitconfig_author_email);
  	for (i = 0; i < repo->ngitconfig_remotes; i++)
  		got_repo_free_remote_repo_data(&repo->gitconfig_remotes[i]);
  	free(repo->gitconfig_remotes);
  	for (i = 0; i < repo->nextensions; i++)
  		free(repo->extensions[i]);
  	free(repo->extensions);
  
  	TAILQ_FOREACH(pe, &repo->packidx_paths, entry)
  		free((void *)pe->path);
  	got_pathlist_free(&repo->packidx_paths);
  	free(repo);
  
  	return err;
  }
  
  void
  got_repo_free_remote_repo_data(struct got_remote_repo *repo)
  {
  	int i;
  
  	free(repo->name);
  	repo->name = NULL;
  	free(repo->fetch_url);
  	repo->fetch_url = NULL;
  	free(repo->send_url);
  	repo->send_url = NULL;
  	for (i = 0; i < repo->nfetch_branches; i++)
  		free(repo->fetch_branches[i]);
  	free(repo->fetch_branches);
  	repo->fetch_branches = NULL;
  	repo->nfetch_branches = 0;
  	for (i = 0; i < repo->nsend_branches; i++)
  		free(repo->send_branches[i]);
  	free(repo->send_branches);
  	repo->send_branches = NULL;
  	repo->nsend_branches = 0;
  }
  
  const struct got_error *
  got_repo_map_path(char **in_repo_path, struct got_repository *repo,
      const char *input_path)
  {
  	const struct got_error *err = NULL;
  	const char *repo_abspath = NULL;
  	size_t repolen, len;
  	char *canonpath, *path = NULL;
  
  	*in_repo_path = NULL;
  
  	canonpath = strdup(input_path);
  	if (canonpath == NULL) {
  		err = got_error_from_errno("strdup");
  		goto done;
  	}
  	err = got_canonpath(input_path, canonpath, strlen(canonpath) + 1);
  	if (err)
  		goto done;
  
  	repo_abspath = got_repo_get_path(repo);
  
  	if (canonpath[0] == '\0') {
  		path = strdup(canonpath);
  		if (path == NULL) {
  			err = got_error_from_errno("strdup");
  			goto done;
  		}
  	} else {
  		path = realpath(canonpath, NULL);
  		if (path == NULL) {
  			if (errno != ENOENT) {
  				err = got_error_from_errno2("realpath",
  				    canonpath);
  				goto done;
  			}
  			/*
  			 * Path is not on disk.
  			 * Assume it is already relative to repository root.
  			 */
  			path = strdup(canonpath);
  			if (path == NULL) {
  				err = got_error_from_errno("strdup");
  				goto done;
  			}
  		}
  
  		repolen = strlen(repo_abspath);
  		len = strlen(path);
  
  
  		if (strcmp(path, repo_abspath) == 0) {
  			free(path);
  			path = strdup("");
  			if (path == NULL) {
  				err = got_error_from_errno("strdup");
  				goto done;
  			}
  		} else if (len > repolen &&
  		    got_path_is_child(path, repo_abspath, repolen)) {
  			/* Matched an on-disk path inside repository. */
  			if (got_repo_is_bare(repo)) {
  				/*
  				 * Matched an on-disk path inside repository
  				 * database. Treat input as repository-relative.
  				 */
  				free(path);
  				path = canonpath;
  				canonpath = NULL;
  			} else {
  				char *child;
  				/* Strip common prefix with repository path. */
  				err = got_path_skip_common_ancestor(&child,
  				    repo_abspath, path);
  				if (err)
  					goto done;
  				free(path);
  				path = child;
  			}
  		} else {
  			/*
  			 * Matched unrelated on-disk path.
  			 * Treat input as repository-relative.
  			 */
  			free(path);
  			path = canonpath;
  			canonpath = NULL;
  		}
  	}
  
  	/* Make in-repository path absolute */
  	if (path[0] != '/') {
  		char *abspath;
  		if (asprintf(&abspath, "/%s", path) == -1) {
  			err = got_error_from_errno("asprintf");
  			goto done;
  		}
  		free(path);
  		path = abspath;
  	}
  
  done:
  	free(canonpath);
  	if (err)
  		free(path);
  	else
  		*in_repo_path = path;
  	return err;
  }
  
  static const struct got_error *
  cache_packidx(struct got_repository *repo, struct got_packidx *packidx,
      const char *path_packidx)
  {
  	const struct got_error *err = NULL;
  	size_t i;
  
  	for (i = 0; i < repo->pack_cache_size; i++) {
  		if (repo->packidx_cache[i] == NULL)
  			break;
  		if (strcmp(repo->packidx_cache[i]->path_packidx,
  		    path_packidx) == 0) {
  			return got_error(GOT_ERR_CACHE_DUP_ENTRY);
  		}
  	}
  	if (i == repo->pack_cache_size) {
  		i = repo->pack_cache_size - 1;
  		err = got_packidx_close(repo->packidx_cache[i]);
  		if (err)
  			return err;
  	}
  
  	repo->packidx_cache[i] = packidx;
  
  	return NULL;
  }
  
  int
  got_repo_is_packidx_filename(const char *name, size_t len)
  {
  	if (len != GOT_PACKIDX_NAMELEN)
  		return 0;
  
  	if (strncmp(name, GOT_PACK_PREFIX, strlen(GOT_PACK_PREFIX)) != 0)
  		return 0;
  
  	if (strcmp(name + strlen(GOT_PACK_PREFIX) +
  	    SHA1_DIGEST_STRING_LENGTH - 1, GOT_PACKIDX_SUFFIX) != 0)
  		return 0;
  
  	return 1;
  }
  
  static struct got_packidx_bloom_filter *
  get_packidx_bloom_filter(struct got_repository *repo,
      const char *path, size_t path_len)
  {
  	struct got_packidx_bloom_filter key;
  
  	if (strlcpy(key.path, path, sizeof(key.path)) >= sizeof(key.path))
  		return NULL; /* XXX */
  	key.path_len = path_len;
  
  	return RB_FIND(got_packidx_bloom_filter_tree,
  	    &repo->packidx_bloom_filters, &key);
  }
  
  int
  got_repo_check_packidx_bloom_filter(struct got_repository *repo,
      const char *path_packidx, struct got_object_id *id)
  {
  	struct got_packidx_bloom_filter *bf;
  
  	bf = get_packidx_bloom_filter(repo, path_packidx, strlen(path_packidx));
  	if (bf)
  		return bloom_check(bf->bloom, id->sha1, sizeof(id->sha1));
  
  	/* No bloom filter means this pack index must be searched. */
  	return 1;
  }
  
  static const struct got_error *
  add_packidx_bloom_filter(struct got_repository *repo,
      struct got_packidx *packidx, const char *path_packidx)
  {
  	int i, nobjects = be32toh(packidx->hdr.fanout_table[0xff]);
  	struct got_packidx_bloom_filter *bf;
  	size_t len;
  
  	/*
  	 * Don't use bloom filters for very large pack index files.
  	 * Large pack files will contain a relatively large fraction
  	 * of our objects so we will likely need to visit them anyway.
  	 * The more objects a pack file contains the higher the probability
  	 * of a false-positive match from the bloom filter. And reading
  	 * all object IDs from a large pack index file can be expensive.
  	 */
  	if (nobjects > 100000) /* cut-off at about 2MB, at 20 bytes per ID */
  		return NULL;
  
  	/* Do we already have a filter for this pack index? */
  	if (get_packidx_bloom_filter(repo, path_packidx,
  	    strlen(path_packidx)) != NULL)
  		return NULL;
  
  	bf = calloc(1, sizeof(*bf));
  	if (bf == NULL)
  		return got_error_from_errno("calloc");
  	bf->bloom = calloc(1, sizeof(*bf->bloom));
  	if (bf->bloom == NULL) {
  		free(bf);
  		return got_error_from_errno("calloc");
  	}
  	
  	len = strlcpy(bf->path, path_packidx, sizeof(bf->path));
  	if (len >= sizeof(bf->path)) {
  		free(bf->bloom);
  		free(bf);
  		return got_error(GOT_ERR_NO_SPACE);
  	}
  	bf->path_len = len;
  
  	/* Minimum size supported by our bloom filter is 1000 entries. */
  	bloom_init(bf->bloom, nobjects < 1000 ? 1000 : nobjects, 0.1);
  	for (i = 0; i < nobjects; i++) {
  		struct got_packidx_object_id *id;
  		id = &packidx->hdr.sorted_ids[i];
  		bloom_add(bf->bloom, id->sha1, sizeof(id->sha1));
  	}
  
  	RB_INSERT(got_packidx_bloom_filter_tree,
  	    &repo->packidx_bloom_filters, bf);
  	return NULL;
  }
  
  const struct got_error *
  got_repo_search_packidx(struct got_packidx **packidx, int *idx,
      struct got_repository *repo, struct got_object_id *id)
  {
  	const struct got_error *err;
  	struct got_pathlist_entry *pe;
  	size_t i;
  
  	/* Search pack index cache. */
  	for (i = 0; i < repo->pack_cache_size; i++) {
  		if (repo->packidx_cache[i] == NULL)
  			break;
  		if (!got_repo_check_packidx_bloom_filter(repo,
  		    repo->packidx_cache[i]->path_packidx, id))
  			continue; /* object will not be found in this index */
  		*idx = got_packidx_get_object_idx(repo->packidx_cache[i], id);
  		if (*idx != -1) {
  			*packidx = repo->packidx_cache[i];
  			/*
  			 * Move this cache entry to the front. Repeatedly
  			 * searching a wrong pack index can be expensive.
  			 */
  			if (i > 0) {
  				memmove(&repo->packidx_cache[1],
  				    &repo->packidx_cache[0],
  				    i * sizeof(repo->packidx_cache[0]));
  				repo->packidx_cache[0] = *packidx;
  			}
  			return NULL;
  		}
  	}
  	/* No luck. Search the filesystem. */
  
  	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
  		const char *path_packidx = pe->path;
  		int is_cached = 0;
  
  		if (!got_repo_check_packidx_bloom_filter(repo,
  		    pe->path, id))
  			continue; /* object will not be found in this index */
  
  		for (i = 0; i < repo->pack_cache_size; i++) {
  			if (repo->packidx_cache[i] == NULL)
  				break;
  			if (strcmp(repo->packidx_cache[i]->path_packidx,
  			    path_packidx) == 0) {
  				is_cached = 1;
  				break;
  			}
  		}
  		if (is_cached)
  			continue; /* already searched */
  
  		err = got_packidx_open(packidx, got_repo_get_fd(repo),
  		    path_packidx, 0);
  		if (err)
  			goto done;
  
  		err = add_packidx_bloom_filter(repo, *packidx, path_packidx);
  		if (err)
  			goto done;
  
  		err = cache_packidx(repo, *packidx, path_packidx);
  		if (err)
  			goto done;
  
  		*idx = got_packidx_get_object_idx(*packidx, id);
  		if (*idx != -1) {
  			err = NULL; /* found the object */
  			goto done;
  		}
  	}
  
  	err = got_error_no_obj(id);
  done:
  	return err;
  }
  
  const struct got_error *
  got_repo_list_packidx(struct got_pathlist_head *packidx_paths,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	DIR *packdir = NULL;
  	struct dirent *dent;
  	char *path_packidx = NULL;
  	int packdir_fd;
  
  	packdir_fd = openat(got_repo_get_fd(repo),
  	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY | O_CLOEXEC);
  	if (packdir_fd == -1) {
  		return got_error_from_errno_fmt("openat: %s/%s",
  		    got_repo_get_path_git_dir(repo),
  		    GOT_OBJECTS_PACK_DIR);
  	}
  
  	packdir = fdopendir(packdir_fd);
  	if (packdir == NULL) {
  		err = got_error_from_errno("fdopendir");
  		goto done;
  	}
  
  	while ((dent = readdir(packdir)) != NULL) {
  		if (!got_repo_is_packidx_filename(dent->d_name, dent->d_namlen))
  			continue;
  
  		if (asprintf(&path_packidx, "%s/%s", GOT_OBJECTS_PACK_DIR,
  		    dent->d_name) == -1) {
  			err = got_error_from_errno("asprintf");
  			path_packidx = NULL;
  			break;
  		}
  
  		err = got_pathlist_append(packidx_paths, path_packidx, NULL);
  		if (err)
  			break;
  	}
  done:
  	if (err)
  		free(path_packidx);
  	if (packdir && closedir(packdir) != 0 && err == NULL)
  		err = got_error_from_errno("closedir");
  	return err;
  }
  
  const struct got_error *
  got_repo_get_packidx(struct got_packidx **packidx, const char *path_packidx,
      struct got_repository *repo)
  {
  	const struct got_error *err;
  	size_t i;
  
  	*packidx = NULL;
  
  	/* Search pack index cache. */
  	for (i = 0; i < repo->pack_cache_size; i++) {
  		if (repo->packidx_cache[i] == NULL)
  			break;
  		if (strcmp(repo->packidx_cache[i]->path_packidx,
  		    path_packidx) == 0) {
  			*packidx = repo->packidx_cache[i];
  			return NULL;
  		}
  	}
  	/* No luck. Search the filesystem. */
  
  	err = got_packidx_open(packidx, got_repo_get_fd(repo),
  	    path_packidx, 0);
  	if (err)
  		return err;
  
  	err = add_packidx_bloom_filter(repo, *packidx, path_packidx);
  	if (err)
  		goto done;
  
  	err = cache_packidx(repo, *packidx, path_packidx);
  done:
  	if (err) {
  		got_packidx_close(*packidx);
  		*packidx = NULL;
  	}
  	return err;
  }
  
  static const struct got_error *
  read_packfile_hdr(int fd, struct got_packidx *packidx)
  {
  	const struct got_error *err = NULL;
  	uint32_t totobj = be32toh(packidx->hdr.fanout_table[0xff]);
  	struct got_packfile_hdr hdr;
  	ssize_t n;
  
  	n = read(fd, &hdr, sizeof(hdr));
  	if (n < 0)
  		return got_error_from_errno("read");
  	if (n != sizeof(hdr))
  		return got_error(GOT_ERR_BAD_PACKFILE);
  
  	if (be32toh(hdr.signature) != GOT_PACKFILE_SIGNATURE ||
  	    be32toh(hdr.version) != GOT_PACKFILE_VERSION ||
  	    be32toh(hdr.nobjects) != totobj)
  		err = got_error(GOT_ERR_BAD_PACKFILE);
  
  	return err;
  }
  
  static const struct got_error *
  open_packfile(int *fd, struct got_repository *repo,
      const char *relpath, struct got_packidx *packidx)
  {
  	const struct got_error *err = NULL;
  
  	*fd = openat(got_repo_get_fd(repo), relpath,
  	    O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
  	if (*fd == -1)
  		return got_error_from_errno_fmt("openat: %s/%s",
  		    got_repo_get_path_git_dir(repo), relpath);
  
  	if (packidx) {
  		err = read_packfile_hdr(*fd, packidx);
  		if (err) {
  			close(*fd);
  			*fd = -1;
  		}
  	}
  
  	return err;
  }
  
  const struct got_error *
  got_repo_cache_pack(struct got_pack **packp, struct got_repository *repo,
      const char *path_packfile, struct got_packidx *packidx)
  {
  	const struct got_error *err = NULL;
  	struct got_pack *pack = NULL;
  	struct stat sb;
  	size_t i;
  
  	if (packp)
  		*packp = NULL;
  
  	for (i = 0; i < repo->pack_cache_size; i++) {
  		pack = &repo->packs[i];
  		if (pack->path_packfile == NULL)
  			break;
  		if (strcmp(pack->path_packfile, path_packfile) == 0)
  			return got_error(GOT_ERR_CACHE_DUP_ENTRY);
  	}
  
  	if (i == repo->pack_cache_size) {
  		struct got_pack tmp;
  		err = got_pack_close(&repo->packs[i - 1]);
  		if (err)
  			return err;
  		if (ftruncate(repo->packs[i - 1].basefd, 0L) == -1)
  			return got_error_from_errno("ftruncate");
  		if (ftruncate(repo->packs[i - 1].accumfd, 0L) == -1)
  			return got_error_from_errno("ftruncate");
  		memcpy(&tmp, &repo->packs[i - 1], sizeof(tmp)); 
  		memcpy(&repo->packs[i - 1], &repo->packs[0],
  		    sizeof(repo->packs[i - 1]));
  		memcpy(&repo->packs[0], &tmp, sizeof(repo->packs[0]));
  		i = 0;
  	}
  
  	pack = &repo->packs[i];
  
  	pack->path_packfile = strdup(path_packfile);
  	if (pack->path_packfile == NULL) {
  		err = got_error_from_errno("strdup");
  		goto done;
  	}
  
  	err = open_packfile(&pack->fd, repo, path_packfile, packidx);
  	if (err)
  		goto done;
  
  	if (fstat(pack->fd, &sb) != 0) {
  		err = got_error_from_errno("fstat");
  		goto done;
  	}
  	pack->filesize = sb.st_size;
  
  	pack->privsep_child = NULL;
  
  #ifndef GOT_PACK_NO_MMAP
  	pack->map = mmap(NULL, pack->filesize, PROT_READ, MAP_PRIVATE,
  	    pack->fd, 0);
  	if (pack->map == MAP_FAILED) {
  		if (errno != ENOMEM) {
  			err = got_error_from_errno("mmap");
  			goto done;
  		}
  		pack->map = NULL; /* fall back to read(2) */
  	}
  #endif
  done:
  	if (err) {
  		if (pack) {
  			free(pack->path_packfile);
  			memset(pack, 0, sizeof(*pack));
  		}
  	} else if (packp)
  		*packp = pack;
  	return err;
  }
  
  struct got_pack *
  got_repo_get_cached_pack(struct got_repository *repo, const char *path_packfile)
  {
  	struct got_pack *pack = NULL;
  	size_t i;
  
  	for (i = 0; i < repo->pack_cache_size; i++) {
  		pack = &repo->packs[i];
  		if (pack->path_packfile == NULL)
  			break;
  		if (strcmp(pack->path_packfile, path_packfile) == 0)
  			return pack;
  	}
  
  	return NULL;
  }
  
  const struct got_error *
  got_repo_init(const char *repo_path)
  {
  	const struct got_error *err = NULL;
  	const char *dirnames[] = {
  		GOT_OBJECTS_DIR,
  		GOT_OBJECTS_PACK_DIR,
  		GOT_REFS_DIR,
  	};
  	const char *description_str = "Unnamed repository; "
  	    "edit this file 'description' to name the repository.";
  	const char *headref_str = "ref: refs/heads/main";
  	const char *gitconfig_str = "[core]\n"
  	    "\trepositoryformatversion = 0\n"
  	    "\tfilemode = true\n"
  	    "\tbare = true\n";
  	char *path;
  	size_t i;
  
  	if (!got_path_dir_is_empty(repo_path))
  		return got_error(GOT_ERR_DIR_NOT_EMPTY);
  
  	for (i = 0; i < nitems(dirnames); i++) {
  		if (asprintf(&path, "%s/%s", repo_path, dirnames[i]) == -1) {
  			return got_error_from_errno("asprintf");
  		}
  		err = got_path_mkdir(path);
  		free(path);
  		if (err)
  			return err;
  	}
  
  	if (asprintf(&path, "%s/%s", repo_path, "description") == -1)
  		return got_error_from_errno("asprintf");
  	err = got_path_create_file(path, description_str);
  	free(path);
  	if (err)
  		return err;
  
  	if (asprintf(&path, "%s/%s", repo_path, GOT_HEAD_FILE) == -1)
  		return got_error_from_errno("asprintf");
  	err = got_path_create_file(path, headref_str);
  	free(path);
  	if (err)
  		return err;
  
  	if (asprintf(&path, "%s/%s", repo_path, "config") == -1)
  		return got_error_from_errno("asprintf");
  	err = got_path_create_file(path, gitconfig_str);
  	free(path);
  	if (err)
  		return err;
  
  	return NULL;
  }
  
  static const struct got_error *
  match_packed_object(struct got_object_id **unique_id,
      struct got_repository *repo, const char *id_str_prefix, int obj_type)
  {
  	const struct got_error *err = NULL;
  	struct got_object_id_queue matched_ids;
  	struct got_pathlist_entry *pe;
  
  	STAILQ_INIT(&matched_ids);
  
  	TAILQ_FOREACH(pe, &repo->packidx_paths, entry) {
  		const char *path_packidx = pe->path;
  		struct got_packidx *packidx;
  		struct got_object_qid *qid;
  
  		err = got_packidx_open(&packidx, got_repo_get_fd(repo),
  		    path_packidx, 0);
  		if (err)
  			break;
  
  		err = got_packidx_match_id_str_prefix(&matched_ids,
  		    packidx, id_str_prefix);
  		if (err) {
  			got_packidx_close(packidx);
  			break;
  		}
  		err = got_packidx_close(packidx);
  		if (err)
  			break;
  
  		STAILQ_FOREACH(qid, &matched_ids, entry) {
  			if (obj_type != GOT_OBJ_TYPE_ANY) {
  				int matched_type;
  				err = got_object_get_type(&matched_type, repo,
  				    &qid->id);
  				if (err)
  					goto done;
  				if (matched_type != obj_type)
  					continue;
  			}
  			if (*unique_id == NULL) {
  				*unique_id = got_object_id_dup(&qid->id);
  				if (*unique_id == NULL) {
  					err = got_error_from_errno("malloc");
  					goto done;
  				}
  			} else {
  				if (got_object_id_cmp(*unique_id,
  				    &qid->id) == 0)
  					continue; /* packed multiple times */
  				err = got_error(GOT_ERR_AMBIGUOUS_ID);
  				goto done;
  			}
  		}
  	}
  done:
  	got_object_id_queue_free(&matched_ids);
  	if (err) {
  		free(*unique_id);
  		*unique_id = NULL;
  	}
  	return err;
  }
  
  static const struct got_error *
  match_loose_object(struct got_object_id **unique_id, const char *path_objects,
      const char *object_dir, const char *id_str_prefix, int obj_type,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *path;
  	DIR *dir = NULL;
  	struct dirent *dent;
  	struct got_object_id id;
  
  	if (asprintf(&path, "%s/%s", path_objects, object_dir) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  
  	dir = opendir(path);
  	if (dir == NULL) {
  		if (errno == ENOENT) {
  			err = NULL;
  			goto done;
  		}
  		err = got_error_from_errno2("opendir", path);
  		goto done;
  	}
  	while ((dent = readdir(dir)) != NULL) {
  		char *id_str;
  		int cmp;
  
  		if (strcmp(dent->d_name, ".") == 0 ||
  		    strcmp(dent->d_name, "..") == 0)
  			continue;
  
  		if (asprintf(&id_str, "%s%s", object_dir, dent->d_name) == -1) {
  			err = got_error_from_errno("asprintf");
  			goto done;
  		}
  
  		if (!got_parse_sha1_digest(id.sha1, id_str))
  			continue;
  
  		/*
  		 * Directory entries do not necessarily appear in
  		 * sorted order, so we must iterate over all of them.
  		 */
  		cmp = strncmp(id_str, id_str_prefix, strlen(id_str_prefix));
  		if (cmp != 0) {
  			free(id_str);
  			continue;
  		}
  
  		if (*unique_id == NULL) {
  			if (obj_type != GOT_OBJ_TYPE_ANY) {
  				int matched_type;
  				err = got_object_get_type(&matched_type, repo,
  				    &id);
  				if (err)
  					goto done;
  				if (matched_type != obj_type)
  					continue;
  			}
  			*unique_id = got_object_id_dup(&id);
  			if (*unique_id == NULL) {
  				err = got_error_from_errno("got_object_id_dup");
  				free(id_str);
  				goto done;
  			}
  		} else {
  			if (got_object_id_cmp(*unique_id, &id) == 0)
  				continue; /* both packed and loose */
  			err = got_error(GOT_ERR_AMBIGUOUS_ID);
  			free(id_str);
  			goto done;
  		}
  	}
  done:
  	if (dir && closedir(dir) != 0 && err == NULL)
  		err = got_error_from_errno("closedir");
  	if (err) {
  		free(*unique_id);
  		*unique_id = NULL;
  	}
  	free(path);
  	return err;
  }
  
  const struct got_error *
  got_repo_match_object_id_prefix(struct got_object_id **id,
      const char *id_str_prefix, int obj_type, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *path_objects = got_repo_get_path_objects(repo);
  	char *object_dir = NULL;
  	size_t len;
  	int i;
  
  	*id = NULL;
  
  	len = strlen(id_str_prefix);
  	if (len > SHA1_DIGEST_STRING_LENGTH - 1)
  		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
  
  	for (i = 0; i < len; i++) {
  		if (isxdigit((unsigned char)id_str_prefix[i]))
  			continue;
  		return got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
  	}
  
  	if (len >= 2) {
  		err = match_packed_object(id, repo, id_str_prefix, obj_type);
  		if (err)
  			goto done;
  		object_dir = strndup(id_str_prefix, 2);
  		if (object_dir == NULL) {
  			err = got_error_from_errno("strdup");
  			goto done;
  		}
  		err = match_loose_object(id, path_objects, object_dir,
  		    id_str_prefix, obj_type, repo);
  	} else if (len == 1) {
  		int i;
  		for (i = 0; i < 0xf; i++) {
  			if (asprintf(&object_dir, "%s%.1x", id_str_prefix, i)
  			    == -1) {
  				err = got_error_from_errno("asprintf");
  				goto done;
  			}
  			err = match_packed_object(id, repo, object_dir,
  			    obj_type);
  			if (err)
  				goto done;
  			err = match_loose_object(id, path_objects, object_dir,
  			    id_str_prefix, obj_type, repo);
  			if (err)
  				goto done;
  		}
  	} else {
  		err = got_error_path(id_str_prefix, GOT_ERR_BAD_OBJ_ID_STR);
  		goto done;
  	}
  done:
  	free(object_dir);
  	if (err) {
  		free(*id);
  		*id = NULL;
  	} else if (*id == NULL) {
  		switch (obj_type) {
  		case GOT_OBJ_TYPE_BLOB:
  			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
  			    GOT_OBJ_LABEL_BLOB, id_str_prefix);
  			break;
  		case GOT_OBJ_TYPE_TREE:
  			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
  			    GOT_OBJ_LABEL_TREE, id_str_prefix);
  			break;
  		case GOT_OBJ_TYPE_COMMIT:
  			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
  			    GOT_OBJ_LABEL_COMMIT, id_str_prefix);
  			break;
  		case GOT_OBJ_TYPE_TAG:
  			err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
  			    GOT_OBJ_LABEL_TAG, id_str_prefix);
  			break;
  		default:
  			err = got_error_path(id_str_prefix, GOT_ERR_NO_OBJ);
  			break;
  		}
  	}
  
  	return err;
  }
  
  const struct got_error *
  got_repo_match_object_id(struct got_object_id **id, char **label,
      const char *id_str, int obj_type, struct got_reflist_head *refs,
      struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_tag_object *tag;
  	struct got_reference *ref = NULL;
  
  	*id = NULL;
  	if (label)
  		*label = NULL;
  
  	if (refs) {
  		err = got_repo_object_match_tag(&tag, id_str, obj_type,
  		    refs, repo);
  		if (err == NULL) {
  			*id = got_object_id_dup(
  			    got_object_tag_get_object_id(tag));
  			if (*id == NULL)
  				err = got_error_from_errno("got_object_id_dup");
  			else if (label && asprintf(label, "refs/tags/%s",
  			    got_object_tag_get_name(tag)) == -1) {
  				err = got_error_from_errno("asprintf");
  				free(*id);
  				*id = NULL;
  			}
  			got_object_tag_close(tag);
  			return err;
  		} else if (err->code != GOT_ERR_OBJ_TYPE &&
  		    err->code != GOT_ERR_NO_OBJ)
  			return err;
  	}
  
  	err = got_ref_open(&ref, repo, id_str, 0);
  	if (err == NULL) {
  		err = got_ref_resolve(id, repo, ref);
  		if (err)
  			goto done;
  		if (label) {
  			*label = strdup(got_ref_get_name(ref));
  			if (*label == NULL) {
  				err = got_error_from_errno("strdup");
  				goto done;
  			}
  		}
  	} else {
  		if (err->code != GOT_ERR_NOT_REF &&
  		    err->code != GOT_ERR_BAD_REF_NAME)
  			goto done;
  		err = got_repo_match_object_id_prefix(id, id_str,
  		    obj_type, repo);
  		if (err) {
  			if (err->code == GOT_ERR_BAD_OBJ_ID_STR)
  				err = got_error_not_ref(id_str);
  			goto done;
  		}
  		if (label) {
  			err = got_object_id_str(label, *id);
  			if (*label == NULL) {
  				err = got_error_from_errno("strdup");
  				goto done;
  			}
  		}
  	}
  done:
  	if (ref)
  		got_ref_close(ref);
  	return err;
  }
  
  const struct got_error *
  got_repo_object_match_tag(struct got_tag_object **tag, const char *name,
      int obj_type, struct got_reflist_head *refs, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	struct got_reflist_entry *re;
  	struct got_object_id *tag_id;
  	int name_is_absolute = (strncmp(name, "refs/", 5) == 0);
  
  	*tag = NULL;
  
  	TAILQ_FOREACH(re, refs, entry) {
  		const char *refname;
  		refname = got_ref_get_name(re->ref);
  		if (got_ref_is_symbolic(re->ref))
  			continue;
  		if (strncmp(refname, "refs/tags/", 10) != 0)
  			continue;
  		if (!name_is_absolute)
  			refname += strlen("refs/tags/");
  		if (strcmp(refname, name) != 0)
  			continue;
  		err = got_ref_resolve(&tag_id, repo, re->ref);
  		if (err)
  			break;
  		err = got_object_open_as_tag(tag, repo, tag_id);
  		free(tag_id);
  		if (err)
  			break;
  		if (obj_type == GOT_OBJ_TYPE_ANY ||
  		    got_object_tag_get_object_type(*tag) == obj_type)
  			break;
  		got_object_tag_close(*tag);
  		*tag = NULL;
  	}
  
  	if (err == NULL && *tag == NULL)
  		err = got_error_fmt(GOT_ERR_NO_OBJ, "%s %s",
  		    GOT_OBJ_LABEL_TAG, name);
  	return err;
  }
  
  static const struct got_error *
  alloc_added_blob_tree_entry(struct got_tree_entry **new_te,
      const char *name, mode_t mode, struct got_object_id *blob_id)
  {
  	const struct got_error *err = NULL;
  
  	 *new_te = NULL;
  
  	*new_te = calloc(1, sizeof(**new_te));
  	if (*new_te == NULL)
  		return got_error_from_errno("calloc");
  
  	if (strlcpy((*new_te)->name, name, sizeof((*new_te)->name)) >=
  	    sizeof((*new_te)->name)) {
  		err = got_error(GOT_ERR_NO_SPACE);
  		goto done;
  	}
  
  	if (S_ISLNK(mode)) {
  		(*new_te)->mode = S_IFLNK;
  	} else {
  		(*new_te)->mode = S_IFREG;
  		(*new_te)->mode |= (mode & (S_IRWXU | S_IRWXG | S_IRWXO));
  	}
  	memcpy(&(*new_te)->id, blob_id, sizeof((*new_te)->id));
  done:
  	if (err && *new_te) {
  		free(*new_te);
  		*new_te = NULL;
  	}
  	return err;
  }
  
  static const struct got_error *
  import_file(struct got_tree_entry **new_te, struct dirent *de,
      const char *path, struct got_repository *repo)
  {
  	const struct got_error *err;
  	struct got_object_id *blob_id = NULL;
  	char *filepath;
  	struct stat sb;
  
  	if (asprintf(&filepath, "%s%s%s", path,
  	    path[0] == '\0' ? "" : "/", de->d_name) == -1)
  		return got_error_from_errno("asprintf");
  
  	if (lstat(filepath, &sb) != 0) {
  		err = got_error_from_errno2("lstat", path);
  		goto done;
  	}
  
  	err = got_object_blob_create(&blob_id, filepath, repo);
  	if (err)
  		goto done;
  
  	err = alloc_added_blob_tree_entry(new_te, de->d_name, sb.st_mode,
  	    blob_id);
  done:
  	free(filepath);
  	if (err)
  		free(blob_id);
  	return err;
  }
  
  static const struct got_error *
  insert_tree_entry(struct got_tree_entry *new_te,
      struct got_pathlist_head *paths)
  {
  	const struct got_error *err = NULL;
  	struct got_pathlist_entry *new_pe;
  
  	err = got_pathlist_insert(&new_pe, paths, new_te->name, new_te);
  	if (err)
  		return err;
  	if (new_pe == NULL)
  		return got_error(GOT_ERR_TREE_DUP_ENTRY);
  	return NULL;
  }
  
  static const struct got_error *write_tree(struct got_object_id **,
      const char *, struct got_pathlist_head *, struct got_repository *,
      got_repo_import_cb progress_cb, void *progress_arg);
  
  static const struct got_error *
  import_subdir(struct got_tree_entry **new_te, struct dirent *de,
      const char *path, struct got_pathlist_head *ignores,
      struct got_repository *repo,
      got_repo_import_cb progress_cb, void *progress_arg)
  {
  	const struct got_error *err;
  	struct got_object_id *id = NULL;
  	char *subdirpath;
  
  	if (asprintf(&subdirpath, "%s%s%s", path,
  	    path[0] == '\0' ? "" : "/", de->d_name) == -1)
  		return got_error_from_errno("asprintf");
  
  	(*new_te) = calloc(1, sizeof(**new_te));
  	if (*new_te == NULL)
  		return got_error_from_errno("calloc");
  	(*new_te)->mode = S_IFDIR;
  	if (strlcpy((*new_te)->name, de->d_name, sizeof((*new_te)->name)) >=
  	    sizeof((*new_te)->name)) {
  		err = got_error(GOT_ERR_NO_SPACE);
  		goto done;
  	}
  	err = write_tree(&id, subdirpath, ignores,  repo,
  	    progress_cb, progress_arg);
  	if (err)
  		goto done;
  	memcpy(&(*new_te)->id, id, sizeof((*new_te)->id));
  	
  done:
  	free(id);
  	free(subdirpath);
  	if (err) {
  		free(*new_te);
  		*new_te = NULL;
  	}
  	return err;
  }
  
  static const struct got_error *
  write_tree(struct got_object_id **new_tree_id, const char *path_dir,
      struct got_pathlist_head *ignores, struct got_repository *repo,
      got_repo_import_cb progress_cb, void *progress_arg)
  {
  	const struct got_error *err = NULL;
  	DIR *dir;
  	struct dirent *de;
  	int nentries;
  	struct got_tree_entry *new_te = NULL;
  	struct got_pathlist_head paths;
  	struct got_pathlist_entry *pe;
  
  	*new_tree_id = NULL;
  
  	TAILQ_INIT(&paths);
  
  	dir = opendir(path_dir);
  	if (dir == NULL) {
  		err = got_error_from_errno2("opendir", path_dir);
  		goto done;
  	}
  
  	nentries = 0;
  	while ((de = readdir(dir)) != NULL) {
  		int ignore = 0;
  		int type;
  
  		if (strcmp(de->d_name, ".") == 0 ||
  		    strcmp(de->d_name, "..") == 0)
  			continue;
  
  		TAILQ_FOREACH(pe, ignores, entry) {
  			if (fnmatch(pe->path, de->d_name, 0) == 0) {
  				ignore = 1;
  				break;
  			}
  		}
  		if (ignore)
  			continue;
  
  		err = got_path_dirent_type(&type, path_dir, de);
  		if (err)
  			goto done;
  
  		if (type == DT_DIR) {
  			err = import_subdir(&new_te, de, path_dir,
  			    ignores, repo, progress_cb, progress_arg);
  			if (err) {
  				if (err->code != GOT_ERR_NO_TREE_ENTRY)
  					goto done;
  				err = NULL;
  				continue;
  			}
  		} else if (type == DT_REG || type == DT_LNK) {
  			err = import_file(&new_te, de, path_dir, repo);
  			if (err)
  				goto done;
  		} else
  			continue;
  
  		err = insert_tree_entry(new_te, &paths);
  		if (err)
  			goto done;
  		nentries++;
  	}
  
  	if (TAILQ_EMPTY(&paths)) {
  		err = got_error_msg(GOT_ERR_NO_TREE_ENTRY,
  		    "cannot create tree without any entries");
  		goto done;
  	}
  
  	TAILQ_FOREACH(pe, &paths, entry) {
  		struct got_tree_entry *te = pe->data;
  		char *path;
  		if (!S_ISREG(te->mode) && !S_ISLNK(te->mode))
  			continue;
  		if (asprintf(&path, "%s/%s", path_dir, pe->path) == -1) {
  			err = got_error_from_errno("asprintf");
  			goto done;
  		}
  		err = (*progress_cb)(progress_arg, path);
  		free(path);
  		if (err)
  			goto done;
  	}
  
  	err = got_object_tree_create(new_tree_id, &paths, nentries, repo);
  done:
  	if (dir)
  		closedir(dir);
  	got_pathlist_free(&paths);
  	return err;
  }
  
  const struct got_error *
  got_repo_import(struct got_object_id **new_commit_id, const char *path_dir,
      const char *logmsg, const char *author, struct got_pathlist_head *ignores,
      struct got_repository *repo, got_repo_import_cb progress_cb,
      void *progress_arg)
  {
  	const struct got_error *err;
  	struct got_object_id *new_tree_id;
  
  	err = write_tree(&new_tree_id, path_dir, ignores, repo,
  	    progress_cb, progress_arg);
  	if (err)
  		return err;
  
  	err = got_object_commit_create(new_commit_id, new_tree_id, NULL, 0,
  	    author, time(NULL), author, time(NULL), logmsg, repo);
  	free(new_tree_id);
  	return err;
  }
  
  const struct got_error *
  got_repo_get_loose_object_info(int *nobjects, off_t *ondisk_size,
      struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *path_objects = NULL, *path = NULL;
  	DIR *dir = NULL;
  	struct got_object_id id;
  	int i;
  
  	*nobjects = 0;
  	*ondisk_size = 0;
  
  	path_objects = got_repo_get_path_objects(repo);
  	if (path_objects == NULL)
  		return got_error_from_errno("got_repo_get_path_objects");
  
  	for (i = 0; i <= 0xff; i++) {
  		struct dirent *dent;
  
  		if (asprintf(&path, "%s/%.2x", path_objects, i) == -1) {
  			err = got_error_from_errno("asprintf");
  			break;
  		}
  
  		dir = opendir(path);
  		if (dir == NULL) {
  			if (errno == ENOENT) {
  				err = NULL;
  				continue;
  			}
  			err = got_error_from_errno2("opendir", path);
  			break;
  		}
  
  		while ((dent = readdir(dir)) != NULL) {
  			char *id_str;
  			int fd;
  			struct stat sb;
  
  			if (strcmp(dent->d_name, ".") == 0 ||
  			    strcmp(dent->d_name, "..") == 0)
  				continue;
  
  			if (asprintf(&id_str, "%.2x%s", i, dent->d_name) == -1) {
  				err = got_error_from_errno("asprintf");
  				goto done;
  			}
  
  			if (!got_parse_sha1_digest(id.sha1, id_str)) {
  				free(id_str);
  				continue;
  			}
  			free(id_str);
  
  			err = got_object_open_loose_fd(&fd, &id, repo);
  			if (err)
  				goto done;
  
  			if (fstat(fd, &sb) == -1) {
  				err = got_error_from_errno("fstat");
  				close(fd);
  				goto done;
  			}
  			(*nobjects)++;
  			(*ondisk_size) += sb.st_size;
  
  			if (close(fd) == -1) {
  				err = got_error_from_errno("close");
  				goto done;
  			}
  		}
  
  		if (closedir(dir) != 0) {
  			err = got_error_from_errno("closedir");
  			goto done;
  		}
  		dir = NULL;
  
  		free(path);
  		path = NULL;
  	}
  done:
  	if (dir && closedir(dir) != 0 && err == NULL)
  		err = got_error_from_errno("closedir");
  
  	if (err) {
  		*nobjects = 0;
  		*ondisk_size = 0;
  	}
  	free(path_objects);
  	free(path);
  	return err;
  }
  
  const struct got_error *
  got_repo_get_packfile_info(int *npackfiles, int *nobjects,
      off_t *total_packsize, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	DIR *packdir = NULL;
  	struct dirent *dent;
  	struct got_packidx *packidx = NULL;
  	char *path_packidx;
  	char *path_packfile;
  	int packdir_fd;
  	struct stat sb;
  
  	*npackfiles = 0;
  	*nobjects = 0;
  	*total_packsize = 0;
  
  	packdir_fd = openat(got_repo_get_fd(repo),
  	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY);
  	if (packdir_fd == -1) {
  		return got_error_from_errno_fmt("openat: %s/%s",
  		    got_repo_get_path_git_dir(repo),
  		    GOT_OBJECTS_PACK_DIR);
  	}
  
  	packdir = fdopendir(packdir_fd);
  	if (packdir == NULL) {
  		err = got_error_from_errno("fdopendir");
  		goto done;
  	}
  
  	while ((dent = readdir(packdir)) != NULL) {
  		if (!got_repo_is_packidx_filename(dent->d_name, dent->d_namlen))
  			continue;
  
  		if (asprintf(&path_packidx, "%s/%s", GOT_OBJECTS_PACK_DIR,
  		    dent->d_name) == -1) {
  			err = got_error_from_errno("asprintf");
  			goto done;
  		}
  
  		err = got_packidx_open(&packidx, got_repo_get_fd(repo),
  		    path_packidx, 0);
  		free(path_packidx);
  		if (err)
  			goto done;
  
  		if (fstat(packidx->fd, &sb) == -1)
  			goto done;
  		*total_packsize += sb.st_size;
  
  		err = got_packidx_get_packfile_path(&path_packfile,
  		    packidx->path_packidx);
  		if (err)
  			goto done;
  
  		if (fstatat(got_repo_get_fd(repo), path_packfile, &sb,
  		    0) == -1) {
  			free(path_packfile);
  			goto done;
  		}
  		free(path_packfile);
  		*total_packsize += sb.st_size;
  
  		*nobjects += be32toh(packidx->hdr.fanout_table[0xff]);
  
  		(*npackfiles)++;
  
  		got_packidx_close(packidx);
  		packidx = NULL;
  	}
  done:
  	if (packidx)
  		got_packidx_close(packidx);
  	if (packdir && closedir(packdir) != 0 && err == NULL)
  		err = got_error_from_errno("closedir");
  	if (err) {
  		*npackfiles = 0;
  		*nobjects = 0;
  		*total_packsize = 0;
  	}
  	return err;
  }
  
  RB_GENERATE(got_packidx_bloom_filter_tree, got_packidx_bloom_filter, entry,
      got_packidx_bloom_filter_cmp);
  

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