thodg/got/lib/repository_admin.c

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• Hash : d7b5a0e8
  Author :
  Date : 2022-04-20T14:00:12
  

  inline struct got_object_id in struct got_object_qid Saves us from doing a malloc/free call for every item on the list. ok op@

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• lib/repository_admin.c

• /*
   * Copyright (c) 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/stat.h>
  #include <sys/socket.h>
  #include <sys/wait.h>
  
  #include <dirent.h>
  #include <endian.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <stdint.h>
  #include <sha1.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <limits.h>
  #include <unistd.h>
  #include <imsg.h>
  
  #include "got_error.h"
  #include "got_cancel.h"
  #include "got_object.h"
  #include "got_reference.h"
  #include "got_repository.h"
  #include "got_repository_admin.h"
  #include "got_opentemp.h"
  #include "got_path.h"
  
  #include "got_lib_delta.h"
  #include "got_lib_object.h"
  #include "got_lib_object_idset.h"
  #include "got_lib_object_cache.h"
  #include "got_lib_pack.h"
  #include "got_lib_privsep.h"
  #include "got_lib_repository.h"
  #include "got_lib_pack_create.h"
  #include "got_lib_sha1.h"
  #include "got_lib_lockfile.h"
  #include "got_lib_ratelimit.h"
  
  #ifndef nitems
  #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
  #endif
  
  static const struct got_error *
  get_reflist_object_ids(struct got_object_id ***ids, int *nobjects,
      unsigned int wanted_obj_type_mask, struct got_reflist_head *refs,
      struct got_repository *repo,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err = NULL;
  	const size_t alloc_chunksz = 256;
  	size_t nalloc;
  	struct got_reflist_entry *re;
  	int i;
  
  	*ids = NULL;
  	*nobjects = 0;
  
  	err = got_reflist_sort(refs,
  	    got_ref_cmp_by_commit_timestamp_descending, repo);
  	if (err)
  		return err;
  
  	*ids = reallocarray(NULL, alloc_chunksz, sizeof(struct got_object_id *));
  	if (*ids == NULL)
  		return got_error_from_errno("reallocarray");
  	nalloc = alloc_chunksz;
  
  	TAILQ_FOREACH(re, refs, entry) {
  		struct got_object_id *id;
  
  		if (cancel_cb) {
  			err = cancel_cb(cancel_arg);
  			if (err)
  				goto done;
  		}
  
  		err = got_ref_resolve(&id, repo, re->ref);
  		if (err)
  			goto done;
  
  		if (wanted_obj_type_mask != GOT_OBJ_TYPE_ANY) {
  			int obj_type;
  			err = got_object_get_type(&obj_type, repo, id);
  			if (err)
  				goto done;
  			if ((wanted_obj_type_mask & (1 << obj_type)) == 0) {
  				free(id);
  				id = NULL;
  				continue;
  			}
  		}
  
  		if (nalloc <= *nobjects) {
  			struct got_object_id **new;
  			new = recallocarray(*ids, nalloc,
  			    nalloc + alloc_chunksz,
  			    sizeof(struct got_object_id *));
  			if (new == NULL) {
  				err = got_error_from_errno(
  				    "recallocarray");
  				goto done;
  			}
  			*ids = new;
  			nalloc += alloc_chunksz;
  		}
  		(*ids)[*nobjects] = id;
  		if ((*ids)[*nobjects] == NULL) {
  			err = got_error_from_errno("got_object_id_dup");
  			goto done;
  		}
  		(*nobjects)++;
  	}
  done:
  	if (err) {
  		for (i = 0; i < *nobjects; i++)
  			free((*ids)[i]);
  		free(*ids);
  		*ids = NULL;
  		*nobjects = 0;
  	}
  	return err;
  }
  
  const struct got_error *
  got_repo_pack_objects(FILE **packfile, struct got_object_id **pack_hash,
      struct got_reflist_head *include_refs,
      struct got_reflist_head *exclude_refs, struct got_repository *repo,
      int loose_obj_only,
      got_pack_progress_cb progress_cb, void *progress_arg,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err = NULL;
  	struct got_object_id **ours = NULL, **theirs = NULL;
  	int nours = 0, ntheirs = 0, packfd = -1, i;
  	char *tmpfile_path = NULL, *path = NULL, *packfile_path = NULL;
  	char *sha1_str = NULL;
  
  	*packfile = NULL;
  	*pack_hash = NULL;
  
  	if (asprintf(&path, "%s/%s/packing.pack",
  	    got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  	err = got_opentemp_named_fd(&tmpfile_path, &packfd, path);
  	if (err)
  		goto done;
  
  	if (fchmod(packfd, GOT_DEFAULT_FILE_MODE) != 0) {
  		err = got_error_from_errno2("fchmod", tmpfile_path);
  		goto done;
  	}
  
  	*packfile = fdopen(packfd, "w");
  	if (*packfile == NULL) {
  		err = got_error_from_errno2("fdopen", tmpfile_path);
  		goto done;
  	}
  	packfd = -1;
  
  	err = get_reflist_object_ids(&ours, &nours,
  	    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
  	    include_refs, repo, cancel_cb, cancel_arg);
  	if (err)
  		goto done;
  
  	if (nours == 0) {
  		err = got_error(GOT_ERR_CANNOT_PACK);
  		goto done;
  	}
  
  	if (!TAILQ_EMPTY(exclude_refs)) {
  		err = get_reflist_object_ids(&theirs, &ntheirs,
  		    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
  		    exclude_refs, repo,
  		    cancel_cb, cancel_arg);
  		if (err)
  			goto done;
  	}
  
  	*pack_hash = calloc(1, sizeof(**pack_hash));
  	if (*pack_hash == NULL) {
  		err = got_error_from_errno("calloc");
  		goto done;
  	}
  
  	err = got_pack_create((*pack_hash)->sha1, *packfile, theirs, ntheirs,
  	    ours, nours, repo, loose_obj_only, 0, progress_cb, progress_arg,
  	    cancel_cb, cancel_arg);
  	if (err)
  		goto done;
  
  	err = got_object_id_str(&sha1_str, *pack_hash);
  	if (err)
  		goto done;
  	if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
  	    got_repo_get_path_git_dir(repo), GOT_OBJECTS_PACK_DIR,
  	    sha1_str) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  
  	if (fflush(*packfile) == -1) {
  		err = got_error_from_errno("fflush");
  		goto done;
  	}
  	if (fseek(*packfile, 0L, SEEK_SET) == -1) {
  		err = got_error_from_errno("fseek");
  		goto done;
  	}
  	if (rename(tmpfile_path, packfile_path) == -1) {
  		err = got_error_from_errno3("rename", tmpfile_path,
  		    packfile_path);
  		goto done;
  	}
  	free(tmpfile_path);
  	tmpfile_path = NULL;
  done:
  	for (i = 0; i < nours; i++)
  		free(ours[i]);
  	free(ours);
  	for (i = 0; i < ntheirs; i++)
  		free(theirs[i]);
  	free(theirs);
  	if (packfd != -1 && close(packfd) == -1 && err == NULL)
  		err = got_error_from_errno2("close", packfile_path);
  	if (tmpfile_path && unlink(tmpfile_path) == -1 && err == NULL)
  		err = got_error_from_errno2("unlink", tmpfile_path);
  	free(tmpfile_path);
  	free(packfile_path);
  	free(sha1_str);
  	free(path);
  	if (err) {
  		free(*pack_hash);
  		*pack_hash = NULL;
  		if (*packfile)
  			fclose(*packfile);
  		*packfile = NULL;
  	}
  	return err;
  }
  
  const struct got_error *
  got_repo_index_pack(FILE *packfile, struct got_object_id *pack_hash,
      struct got_repository *repo,
      got_pack_index_progress_cb progress_cb, void *progress_arg,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	size_t i;
  	char *path;
  	int imsg_idxfds[2];
  	int npackfd = -1, idxfd = -1, nidxfd = -1;
  	int tmpfds[3];
  	int idxstatus, done = 0;
  	const struct got_error *err;
  	struct imsgbuf idxibuf;
  	pid_t idxpid;
  	char *tmpidxpath = NULL;
  	char *packfile_path = NULL, *idxpath = NULL, *id_str = NULL;
  	const char *repo_path = got_repo_get_path_git_dir(repo);
  	struct stat sb;
  
  	for (i = 0; i < nitems(tmpfds); i++)
  		tmpfds[i] = -1;
  
  	if (asprintf(&path, "%s/%s/indexing.idx",
  	    repo_path, GOT_OBJECTS_PACK_DIR) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  	err = got_opentemp_named_fd(&tmpidxpath, &idxfd, path);
  	free(path);
  	if (err)
  		goto done;
  	if (fchmod(idxfd, GOT_DEFAULT_FILE_MODE) != 0) {
  		err = got_error_from_errno2("fchmod", tmpidxpath);
  		goto done;
  	}
  
  	nidxfd = dup(idxfd);
  	if (nidxfd == -1) {
  		err = got_error_from_errno("dup");
  		goto done;
  	}
  
  	for (i = 0; i < nitems(tmpfds); i++) {
  		tmpfds[i] = got_opentempfd();
  		if (tmpfds[i] == -1) {
  			err = got_error_from_errno("got_opentempfd");
  			goto done;
  		}
  	}
  
  	err = got_object_id_str(&id_str, pack_hash);
  	if (err)
  		goto done;
  
  	if (asprintf(&packfile_path, "%s/%s/pack-%s.pack",
  	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  
  	if (fstat(fileno(packfile), &sb) == -1) {
  		err = got_error_from_errno2("fstat", packfile_path);
  		goto done;
  	}
  
  	if (asprintf(&idxpath, "%s/%s/pack-%s.idx",
  	    repo_path, GOT_OBJECTS_PACK_DIR, id_str) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  
  	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, imsg_idxfds) == -1) {
  		err = got_error_from_errno("socketpair");
  		goto done;
  	}
  	idxpid = fork();
  	if (idxpid == -1) {
  		err= got_error_from_errno("fork");
  		goto done;
  	} else if (idxpid == 0)
  		got_privsep_exec_child(imsg_idxfds,
  		    GOT_PATH_PROG_INDEX_PACK, packfile_path);
  	if (close(imsg_idxfds[1]) == -1) {
  		err = got_error_from_errno("close");
  		goto done;
  	}
  	imsg_init(&idxibuf, imsg_idxfds[0]);
  
  	npackfd = dup(fileno(packfile));
  	if (npackfd == -1) {
  		err = got_error_from_errno("dup");
  		goto done;
  	}
  	err = got_privsep_send_index_pack_req(&idxibuf, pack_hash->sha1,
  	    npackfd);
  	if (err != NULL)
  		goto done;
  	npackfd = -1;
  	err = got_privsep_send_index_pack_outfd(&idxibuf, nidxfd);
  	if (err != NULL)
  		goto done;
  	nidxfd = -1;
  	for (i = 0; i < nitems(tmpfds); i++) {
  		err = got_privsep_send_tmpfd(&idxibuf, tmpfds[i]);
  		if (err != NULL)
  			goto done;
  		tmpfds[i] = -1;
  	}
  	done = 0;
  	while (!done) {
  		int nobj_total, nobj_indexed, nobj_loose, nobj_resolved;
  
  		if (cancel_cb) {
  			err = cancel_cb(cancel_arg);
  			if (err)
  				goto done;
  		}
  
  		err = got_privsep_recv_index_progress(&done, &nobj_total,
  		    &nobj_indexed, &nobj_loose, &nobj_resolved,
  		    &idxibuf);
  		if (err != NULL)
  			goto done;
  		if (nobj_indexed != 0) {
  			err = progress_cb(progress_arg, sb.st_size,
  			    nobj_total, nobj_indexed, nobj_loose,
  			    nobj_resolved);
  			if (err)
  				break;
  		}
  	}
  	if (close(imsg_idxfds[0]) == -1) {
  		err = got_error_from_errno("close");
  		goto done;
  	}
  	if (waitpid(idxpid, &idxstatus, 0) == -1) {
  		err = got_error_from_errno("waitpid");
  		goto done;
  	}
  
  	if (rename(tmpidxpath, idxpath) == -1) {
  		err = got_error_from_errno3("rename", tmpidxpath, idxpath);
  		goto done;
  	}
  	free(tmpidxpath);
  	tmpidxpath = NULL;
  
  done:
  	if (tmpidxpath && unlink(tmpidxpath) == -1 && err == NULL)
  		err = got_error_from_errno2("unlink", tmpidxpath);
  	if (npackfd != -1 && close(npackfd) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (idxfd != -1 && close(idxfd) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	for (i = 0; i < nitems(tmpfds); i++) {
  		if (tmpfds[i] != -1 && close(tmpfds[i]) == -1 && err == NULL)
  			err = got_error_from_errno("close");
  	}
  	free(tmpidxpath);
  	free(idxpath);
  	free(packfile_path);
  	return err;
  }
  
  const struct got_error *
  got_repo_find_pack(FILE **packfile, struct got_object_id **pack_hash,
      struct got_repository *repo, const char *packfile_path)
  {
  	const struct got_error *err = NULL;
  	const char *packdir_path = NULL;
  	char *packfile_name = NULL, *p, *dot;
  	struct got_object_id id;
  	int packfd = -1;
  
  	*packfile = NULL;
  	*pack_hash = NULL;
  
  	packdir_path = got_repo_get_path_objects_pack(repo);
  	if (packdir_path == NULL)
  		return got_error_from_errno("got_repo_get_path_objects_pack");
  
  	if (!got_path_is_child(packfile_path, packdir_path,
  	    strlen(packdir_path))) {
  		err = got_error_path(packfile_path, GOT_ERR_BAD_PATH);
  		goto done;
  
  	}
  
  	err = got_path_basename(&packfile_name, packfile_path);
  	if (err)
  		goto done;
  	p = packfile_name;
  
  	if (strncmp(p, "pack-", 5) != 0) {
  		err = got_error_fmt(GOT_ERR_BAD_PATH,
  		    "'%s' is not a valid pack file name",
  		    packfile_name);
  		goto done;
  	}
  	p += 5;
  	dot = strchr(p, '.');
  	if (dot == NULL) {
  		err = got_error_fmt(GOT_ERR_BAD_PATH,
  		    "'%s' is not a valid pack file name",
  		    packfile_name);
  		goto done;
  	}
  	if (strcmp(dot + 1, "pack") != 0) {
  		err = got_error_fmt(GOT_ERR_BAD_PATH,
  		    "'%s' is not a valid pack file name",
  		    packfile_name);
  		goto done;
  	}
  	*dot = '\0';
  	if (!got_parse_sha1_digest(id.sha1, p)) {
  		err = got_error_fmt(GOT_ERR_BAD_PATH,
  		    "'%s' is not a valid pack file name",
  		    packfile_name);
  		goto done;
  	}
  
  	*pack_hash = got_object_id_dup(&id);
  	if (*pack_hash == NULL) {
  		err = got_error_from_errno("got_object_id_dup");
  		goto done;
  	}
  
  	packfd = open(packfile_path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
  	if (packfd == -1) {
  		err = got_error_from_errno2("open", packfile_path);
  		goto done;
  	}
  
  	*packfile = fdopen(packfd, "r");
  	if (*packfile == NULL) {
  		err = got_error_from_errno2("fdopen", packfile_path);
  		goto done;
  	}
  	packfd = -1;
  done:
  	if (packfd != -1 && close(packfd) == -1 && err == NULL)
  		err = got_error_from_errno2("close", packfile_path);
  	free(packfile_name);
  	if (err) {
  		free(*pack_hash);
  		*pack_hash = NULL;
  	}
  	return err;
  }
  
  const struct got_error *
  got_repo_list_pack(FILE *packfile, struct got_object_id *pack_hash,
      struct got_repository *repo, got_pack_list_cb list_cb, void *list_arg,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err = NULL;
  	char *id_str = NULL, *idxpath = NULL, *packpath = NULL;
  	struct got_packidx *packidx = NULL;
  	struct got_pack *pack = NULL;
  	uint32_t nobj, i;
  
  	err = got_object_id_str(&id_str, pack_hash);
  	if (err)
  		goto done;
  
  	if (asprintf(&packpath, "%s/pack-%s.pack",
  	    GOT_OBJECTS_PACK_DIR, id_str) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  	if (asprintf(&idxpath, "%s/pack-%s.idx",
  	    GOT_OBJECTS_PACK_DIR, id_str) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  
  	err = got_packidx_open(&packidx, got_repo_get_fd(repo), idxpath, 1);
  	if (err)
  		goto done;
  
  	err = got_repo_cache_pack(&pack, repo, packpath, packidx);
  	if (err)
  		goto done;
  
  	nobj = be32toh(packidx->hdr.fanout_table[0xff]);
  	for (i = 0; i < nobj; i++) {
  		struct got_packidx_object_id *oid;
  		struct got_object_id id, base_id;
  		off_t offset, base_offset = 0;
  		uint8_t type;
  		uint64_t size;
  		size_t tslen, len;
  
  		if (cancel_cb) {
  			err = cancel_cb(cancel_arg);
  			if (err)
  				break;
  		}
  		oid = &packidx->hdr.sorted_ids[i];
  		memcpy(id.sha1, oid->sha1, SHA1_DIGEST_LENGTH);
  
  		offset = got_packidx_get_object_offset(packidx, i);
  		if (offset == -1) {
  			err = got_error(GOT_ERR_BAD_PACKIDX);
  			goto done;
  		}
  
  		err = got_pack_parse_object_type_and_size(&type, &size, &tslen,
  		    pack, offset);
  		if (err)
  			goto done;
  
  		switch (type) {
  		case GOT_OBJ_TYPE_OFFSET_DELTA:
  			err = got_pack_parse_offset_delta(&base_offset, &len,
  			    pack, offset, tslen);
  			if (err)
  				goto done;
  			break;
  		case GOT_OBJ_TYPE_REF_DELTA:
  			err = got_pack_parse_ref_delta(&base_id,
  			    pack, offset, tslen);
  			if (err)
  				goto done;
  			break;
  		}
  		err = (*list_cb)(list_arg, &id, type, offset, size,
  		    base_offset, &base_id);
  		if (err)
  			goto done;
  	}
  
  done:
  	free(id_str);
  	free(idxpath);
  	free(packpath);
  	if (packidx)
  		got_packidx_close(packidx);
  	return err;
  }
  
  static const struct got_error *
  report_cleanup_progress(got_cleanup_progress_cb progress_cb,
      void *progress_arg, struct got_ratelimit *rl,
      int nloose, int ncommits, int npurged)
  {
  	const struct got_error *err;
  	int elapsed;
  
  	if (progress_cb == NULL)
  		return NULL;
  
  	err = got_ratelimit_check(&elapsed, rl);
  	if (err || !elapsed)
  		return err;
  
  	return progress_cb(progress_arg, nloose, ncommits, npurged);
  }
  
  static const struct got_error *
  get_loose_object_ids(struct got_object_idset **loose_ids, off_t *ondisk_size,
      got_cleanup_progress_cb progress_cb, void *progress_arg,
      struct got_ratelimit *rl, struct got_repository *repo)
  {
  	const struct got_error *err = NULL;
  	char *path_objects = NULL, *path = NULL;
  	DIR *dir = NULL;
  	struct got_object *obj = NULL;
  	struct got_object_id id;
  	int i, fd = -1;
  	struct stat sb;
  
  	*ondisk_size = 0;
  	*loose_ids = got_object_idset_alloc();
  	if (*loose_ids == NULL)
  		return got_error_from_errno("got_object_idset_alloc");
  
  	path_objects = got_repo_get_path_objects(repo);
  	if (path_objects == NULL) {
  		err = got_error_from_errno("got_repo_get_path_objects");
  		goto done;
  	}
  
  	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;
  
  			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;
  			}
  
  			memset(&id, 0, sizeof(id));
  			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");
  				goto done;
  			}
  			err = got_object_read_header_privsep(&obj, &id, repo,
  			    fd);
  			if (err)
  				goto done;
  			fd = -1; /* already closed */
  
  			switch (obj->type) {
  			case GOT_OBJ_TYPE_COMMIT:
  			case GOT_OBJ_TYPE_TREE:
  			case GOT_OBJ_TYPE_BLOB:
  			case GOT_OBJ_TYPE_TAG:
  				break;
  			default:
  				err = got_error_fmt(GOT_ERR_OBJ_TYPE,
  				    "%d", obj->type);
  				goto done;
  			}
  			got_object_close(obj);
  			obj = NULL;
  			(*ondisk_size) += sb.st_size;
  			err = got_object_idset_add(*loose_ids, &id, NULL);
  			if (err)
  				goto done;
  			err = report_cleanup_progress(progress_cb,
  			    progress_arg, rl,
  			    got_object_idset_num_elements(*loose_ids), -1, -1);
  			if (err)
  				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 (fd != -1 && close(fd) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	if (err) {
  		got_object_idset_free(*loose_ids);
  		*loose_ids = NULL;
  	}
  	if (obj)
  		got_object_close(obj);
  	free(path_objects);
  	free(path);
  	return err;
  }
  
  static const struct got_error *
  preserve_loose_object(struct got_object_idset *loose_ids,
      struct got_object_id *id, struct got_repository *repo, int *npacked)
  {
  	const struct got_error *err = NULL;
  	struct got_object *obj;
  
  	if (!got_object_idset_contains(loose_ids, id))
  		return NULL;
  
  	/*
  	 * Try to open this object from a pack file. This ensures that
  	 * we do in fact have a valid packed copy of the object. Otherwise
  	 * we should not delete the loose representation of this object.
  	 */
  	err = got_object_open_packed(&obj, id, repo);
  	if (err == NULL) {
  		got_object_close(obj);
  		/*
  		 * The object is referenced and packed.
  		 * We can purge the redundantly stored loose object.
  		 */
  		(*npacked)++;
  		return NULL;
  	} else if (err->code != GOT_ERR_NO_OBJ)
  		return err;
  
  	/*
  	 * This object is referenced and not packed.
  	 * Remove it from our purge set.
  	 */
  	return got_object_idset_remove(NULL, loose_ids, id);
  }
  
  static const struct got_error *
  load_tree_entries(struct got_object_id_queue *ids,
      struct got_object_idset *loose_ids,
      struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
      const char *dpath, struct got_repository *repo, int *npacked,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err;
  	struct got_tree_object *tree;
  	char *p = NULL;
  	int i;
  
  	err = got_object_open_as_tree(&tree, repo, tree_id);
  	if (err)
  		return err;
  
  	for (i = 0; i < got_object_tree_get_nentries(tree); i++) {
  		struct got_tree_entry *e = got_object_tree_get_entry(tree, i);
  		struct got_object_id *id = got_tree_entry_get_id(e);
  		mode_t mode = got_tree_entry_get_mode(e);
  
  		if (cancel_cb) {
  			err = (*cancel_cb)(cancel_arg);
  			if (err)
  				break;
  		}
  
  		if (got_object_tree_entry_is_symlink(e) ||
  		    got_object_tree_entry_is_submodule(e) ||
  		    got_object_idset_contains(traversed_ids, id))
  			continue;
  
  		if (asprintf(&p, "%s%s%s", dpath, dpath[0] != '\0' ? "/" : "",
  		    got_tree_entry_get_name(e)) == -1) {
  			err = got_error_from_errno("asprintf");
  			break;
  		}
  
  		if (S_ISDIR(mode)) {
  			struct got_object_qid *qid;
  			err = got_object_qid_alloc(&qid, id);
  			if (err)
  				break;
  			STAILQ_INSERT_TAIL(ids, qid, entry);
  		} else if (S_ISREG(mode)) {
  			/* This blob is referenced. */
  			err = preserve_loose_object(loose_ids, id, repo,
  			    npacked);
  			if (err)
  				break;
  			err = got_object_idset_add(traversed_ids, id, NULL);
  			if (err)
  				break;
  			
  		}
  		free(p);
  		p = NULL;
  	}
  
  	got_object_tree_close(tree);
  	free(p);
  	return err;
  }
  
  static const struct got_error *
  load_tree(struct got_object_idset *loose_ids,
      struct got_object_idset *traversed_ids, struct got_object_id *tree_id,
      const char *dpath, struct got_repository *repo, int *npacked,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err = NULL;
  	struct got_object_id_queue tree_ids;
  	struct got_object_qid *qid;
  
  	err = got_object_qid_alloc(&qid, tree_id);
  	if (err)
  		return err;
  
  	STAILQ_INIT(&tree_ids);
  	STAILQ_INSERT_TAIL(&tree_ids, qid, entry);
  
  	while (!STAILQ_EMPTY(&tree_ids)) {
  		if (cancel_cb) {
  			err = (*cancel_cb)(cancel_arg);
  			if (err)
  				break;
  		}
  
  		qid = STAILQ_FIRST(&tree_ids);
  		STAILQ_REMOVE_HEAD(&tree_ids, entry);
  
  		if (got_object_idset_contains(traversed_ids, &qid->id)) {
  			got_object_qid_free(qid);
  			continue;
  		}
  
  		err = got_object_idset_add(traversed_ids, &qid->id, NULL);
  		if (err) {
  			got_object_qid_free(qid);
  			break;
  		}
  
  		/* This tree is referenced. */
  		err = preserve_loose_object(loose_ids, &qid->id, repo, npacked);
  		if (err)
  			break;
  
  		err = load_tree_entries(&tree_ids, loose_ids, traversed_ids,
  		    &qid->id, dpath, repo, npacked, cancel_cb, cancel_arg);
  		got_object_qid_free(qid);
  		if (err)
  			break;
  	}
  
  	got_object_id_queue_free(&tree_ids);
  	return err;
  }
  
  static const struct got_error *
  load_commit_or_tag(struct got_object_idset *loose_ids, int *ncommits,
      int *npacked, struct got_object_idset *traversed_ids,
      struct got_object_id *id, struct got_repository *repo,
      got_cleanup_progress_cb progress_cb, void *progress_arg,
      struct got_ratelimit *rl, int nloose,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err;
  	struct got_commit_object *commit = NULL;
  	struct got_tag_object *tag = NULL;
  	struct got_object_id *tree_id = NULL;
  	struct got_object_id_queue ids;
  	struct got_object_qid *qid;
  	int obj_type;
  
  	err = got_object_qid_alloc(&qid, id);
  	if (err)
  		return err;
  
  	STAILQ_INIT(&ids);
  	STAILQ_INSERT_TAIL(&ids, qid, entry);
  
  	while (!STAILQ_EMPTY(&ids)) {
  		if (cancel_cb) {
  			err = (*cancel_cb)(cancel_arg);
  			if (err)
  				break;
  		}
  
  		qid = STAILQ_FIRST(&ids);
  		STAILQ_REMOVE_HEAD(&ids, entry);
  
  		if (got_object_idset_contains(traversed_ids, &qid->id)) {
  			got_object_qid_free(qid);
  			qid = NULL;
  			continue;
  		}
  
  		err = got_object_idset_add(traversed_ids, &qid->id, NULL);
  		if (err)
  			break;
  
  		/* This commit or tag is referenced. */
  		err = preserve_loose_object(loose_ids, &qid->id, repo, npacked);
  		if (err)
  			break;
  
  		err = got_object_get_type(&obj_type, repo, &qid->id);
  		if (err)
  			break;
  		switch (obj_type) {
  		case GOT_OBJ_TYPE_COMMIT:
  			err = got_object_open_as_commit(&commit, repo,
  			    &qid->id);
  			if (err)
  				goto done;
  			break;
  		case GOT_OBJ_TYPE_TAG:
  			err = got_object_open_as_tag(&tag, repo, &qid->id);
  			if (err)
  				goto done;
  			break;
  		default:
  			/* should not happen */
  			err = got_error(GOT_ERR_OBJ_TYPE);
  			goto done;
  		}
  
  		/* Find a tree object to scan. */
  		if (commit) {
  			tree_id = got_object_commit_get_tree_id(commit);
  		} else if (tag) {
  			obj_type = got_object_tag_get_object_type(tag);
  			switch (obj_type) {
  			case GOT_OBJ_TYPE_COMMIT:
  				err = got_object_open_as_commit(&commit, repo,
  				    got_object_tag_get_object_id(tag));
  				if (err)
  					goto done;
  				tree_id = got_object_commit_get_tree_id(commit);
  				break;
  			case GOT_OBJ_TYPE_TREE:
  				tree_id = got_object_tag_get_object_id(tag);
  				break;
  			default:
  				/*
  				 * Tag points at something other than a
  				 * commit or tree. Leave this weird tag object
  				 * and the object it points to on disk.
  				 */
  				err = got_object_idset_remove(NULL, loose_ids,
  				    &qid->id);
  				if (err && err->code != GOT_ERR_NO_OBJ)
  					goto done;
  				err = got_object_idset_remove(NULL, loose_ids,
  				    got_object_tag_get_object_id(tag));
  				if (err && err->code != GOT_ERR_NO_OBJ)
  					goto done;
  				err = NULL;
  				break;
  			}
  		}
  
  		if (tree_id) {
  			err = load_tree(loose_ids, traversed_ids, tree_id, "",
  			    repo, npacked, cancel_cb, cancel_arg);
  			if (err)
  				break;
  		}
  
  		if (commit || tag)
  			(*ncommits)++; /* scanned tags are counted as commits */
  
  		err = report_cleanup_progress(progress_cb, progress_arg, rl,
  		    nloose, *ncommits, -1);
  		if (err)
  			break;
   
  		if (commit) {
  			/* Find parent commits to scan. */
  			const struct got_object_id_queue *parent_ids;
  			parent_ids = got_object_commit_get_parent_ids(commit);
  			err = got_object_id_queue_copy(parent_ids, &ids);
  			if (err)
  				break;
  			got_object_commit_close(commit);
  			commit = NULL;
  		}
  		if (tag) {
  			got_object_tag_close(tag);
  			tag = NULL;
  		}
  		got_object_qid_free(qid);
  		qid = NULL;
  	}
  done:
  	if (qid)
  		got_object_qid_free(qid);
  	if (commit)
  		got_object_commit_close(commit);
  	if (tag)
  		got_object_tag_close(tag);
  	got_object_id_queue_free(&ids);
  	return err;
  }
  
  struct purge_loose_object_arg {
  	struct got_repository *repo;
  	got_cleanup_progress_cb progress_cb;
  	void *progress_arg;
  	struct got_ratelimit *rl;
  	int nloose;
  	int ncommits;
  	int npurged;
  	off_t size_purged;
  	int dry_run;
  	time_t max_mtime;
  	int ignore_mtime;
  };
  
  static const struct got_error *
  purge_loose_object(struct got_object_id *id, void *data, void *arg)
  {
  	struct purge_loose_object_arg *a = arg;
  	const struct got_error *err, *unlock_err = NULL;
  	char *path = NULL;
  	int fd = -1;
  	struct stat sb;
  	struct got_lockfile *lf = NULL;
  
  	err = got_object_get_path(&path, id, a->repo);
  	if (err)
  		return err;
  
  	err = got_object_open_loose_fd(&fd, id, a->repo);
  	if (err)
  		goto done;
  
  	if (fstat(fd, &sb) == -1) {
  		err = got_error_from_errno("fstat");
  		goto done;
  	}
  
  	/*
  	 * Do not delete objects which are younger than our maximum
  	 * modification time threshold. This prevents a race where
  	 * new objects which are being added to the repository
  	 * concurrently would be deleted.
  	 */
  	if (a->ignore_mtime || sb.st_mtime <= a->max_mtime) {
  		if (!a->dry_run) {
  			err = got_lockfile_lock(&lf, path, -1);
  			if (err)
  				goto done;
  			if (unlink(path) == -1) {
  				err = got_error_from_errno2("unlink", path);
  				goto done;
  			}
  		}
  
  		a->npurged++;
  		a->size_purged += sb.st_size;
  		err = report_cleanup_progress(a->progress_cb, a->progress_arg,
  		    a->rl, a->nloose, a->ncommits, a->npurged);
  		if (err)
  			goto done;
  	}
  done:
  	if (fd != -1 && close(fd) == -1 && err == NULL)
  		err = got_error_from_errno("close");
  	free(path);
  	if (lf)
  		unlock_err = got_lockfile_unlock(lf, -1);
  	return err ? err : unlock_err;
  }
  
  const struct got_error *
  got_repo_purge_unreferenced_loose_objects(struct got_repository *repo,
      off_t *size_before, off_t *size_after, int *npacked, int dry_run,
      int ignore_mtime, got_cleanup_progress_cb progress_cb, void *progress_arg,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err;
  	struct got_object_idset *loose_ids;
  	struct got_object_idset *traversed_ids;
  	struct got_object_id **referenced_ids;
  	int i, nreferenced, nloose, ncommits = 0;
  	struct got_reflist_head refs;
  	struct got_reflist_entry *re;
  	struct purge_loose_object_arg arg;
  	time_t max_mtime = 0;
  	struct got_ratelimit rl;
  
  	TAILQ_INIT(&refs);
  	got_ratelimit_init(&rl, 0, 500);
  
  	*size_before = 0;
  	*size_after = 0;
  	*npacked = 0;
  
  	err = get_loose_object_ids(&loose_ids, size_before,
  	    progress_cb, progress_arg, &rl, repo);
  	if (err)
  		return err;
  	nloose = got_object_idset_num_elements(loose_ids);
  	if (nloose == 0) {
  		got_object_idset_free(loose_ids);
  		if (progress_cb) {
  			err = progress_cb(progress_arg, 0, 0, 0);
  			if (err)
  				return err;
  		}
  		return NULL;
  	}
  
  	traversed_ids = got_object_idset_alloc();
  	if (traversed_ids == NULL) {
  		err = got_error_from_errno("got_object_idset_alloc");
  		goto done;
  	}
  
  	err = got_ref_list(&refs, repo, "", got_ref_cmp_by_name, NULL);
  	if (err)
  		goto done;
  	if (!ignore_mtime) {
  		TAILQ_FOREACH(re, &refs, entry) {
  			time_t mtime = got_ref_get_mtime(re->ref);
  			if (mtime > max_mtime)
  				max_mtime = mtime;
  		}
  		/*
  		 * For safety, keep objects created within 10 minutes
  		 * before the youngest reference was created.
  		 */
  		if (max_mtime >= 600)
  			max_mtime -= 600;
  	}
  
  	err = get_reflist_object_ids(&referenced_ids, &nreferenced,
  	    (1 << GOT_OBJ_TYPE_COMMIT) | (1 << GOT_OBJ_TYPE_TAG),
  	    &refs, repo, cancel_cb, cancel_arg);
  	if (err)
  		goto done;
  
  	for (i = 0; i < nreferenced; i++) {
  		struct got_object_id *id = referenced_ids[i];
  		err = load_commit_or_tag(loose_ids, &ncommits, npacked,
  		    traversed_ids, id, repo, progress_cb, progress_arg, &rl,
  		    nloose, cancel_cb, cancel_arg);
  		if (err)
  			goto done;
  	}
  
  	/* Any remaining loose objects are unreferenced and can be purged. */
  	arg.repo = repo;
  	arg.progress_arg = progress_arg;
  	arg.progress_cb = progress_cb;
  	arg.rl = &rl;
  	arg.nloose = nloose;
  	arg.npurged = 0;
  	arg.size_purged = 0;
  	arg.ncommits = ncommits;
  	arg.dry_run = dry_run;
  	arg.max_mtime = max_mtime;
  	arg.ignore_mtime = ignore_mtime;
  	err = got_object_idset_for_each(loose_ids, purge_loose_object, &arg);
  	if (err)
  		goto done;
  	*size_after = *size_before - arg.size_purged;
  
  	/* Produce a final progress report. */
  	if (progress_cb) {
  		err = progress_cb(progress_arg, nloose, ncommits, arg.npurged);
  		if (err)
  			goto done;
  	}
  done:
  	got_object_idset_free(loose_ids);
  	got_object_idset_free(traversed_ids);
  	return err;
  }
  
  static const struct got_error *
  remove_packidx(int dir_fd, const char *relpath)
  {
  	const struct got_error *err, *unlock_err;
  	struct got_lockfile *lf;
  
  	err = got_lockfile_lock(&lf, relpath, dir_fd);
  	if (err)
  		return err;
  	if (unlinkat(dir_fd, relpath, 0) == -1)
  		err = got_error_from_errno("unlinkat");
  	unlock_err = got_lockfile_unlock(lf, dir_fd);
  	return err ? err : unlock_err;
  }
  
  const struct got_error *
  got_repo_remove_lonely_packidx(struct got_repository *repo, int dry_run,
      got_lonely_packidx_progress_cb progress_cb, void *progress_arg,
      got_cancel_cb cancel_cb, void *cancel_arg)
  {
  	const struct got_error *err;
  	DIR *packdir = NULL;
  	struct dirent *dent;
  	char *pack_relpath = NULL;
  	int packdir_fd;
  	struct stat sb;
  
  	packdir_fd = openat(got_repo_get_fd(repo),
  	    GOT_OBJECTS_PACK_DIR, O_DIRECTORY | O_CLOEXEC);
  	if (packdir_fd == -1) {
  		if (errno == ENOENT)
  			return NULL;
  		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 (cancel_cb) {
  			err = cancel_cb(cancel_arg);
  			if (err)
  				goto done;
  		}
  
  		if (!got_repo_is_packidx_filename(dent->d_name, dent->d_namlen))
  			continue;
  
  		err = got_packidx_get_packfile_path(&pack_relpath,
  		    dent->d_name);
  		if (err)
  			goto done;
  
  		if (fstatat(packdir_fd, pack_relpath, &sb, 0) != -1) {
  			free(pack_relpath);
  			pack_relpath = NULL;
  			continue;
  		}
  		if (errno != ENOENT) {
  			err = got_error_from_errno_fmt("fstatat: %s/%s/%s",
  			    got_repo_get_path_git_dir(repo),
  			    GOT_OBJECTS_PACK_DIR,
  			    pack_relpath);
  			goto done;
  		}
  
  		if (!dry_run) {
  			err = remove_packidx(packdir_fd, dent->d_name);
  			if (err)
  				goto done;
  		}
  		if (progress_cb) {
  			char *path;
  			if (asprintf(&path, "%s/%s/%s",
  			    got_repo_get_path_git_dir(repo),
  			    GOT_OBJECTS_PACK_DIR,
  			    dent->d_name) == -1) {
  				err = got_error_from_errno("asprintf");
  				goto done;
  			}
  			err = progress_cb(progress_arg, path);
  			free(path);
  			if (err)
  				goto done;
  		}
  		free(pack_relpath);
  		pack_relpath = NULL;
  	}
  done:
  	if (packdir && closedir(packdir) != 0 && err == NULL)
  		err = got_error_from_errno("closedir");
  	free(pack_relpath);
  	return err;
  }
  

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