thodg/got/lib/worktree_open.c

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• Hash : 5a950d09
  Author :
  Date : 2022-06-15T14:27:20
  

  using a local packfd variable in open_worktree() is sufficient
  

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• lib/worktree_open.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/stat.h>
  #include <sys/queue.h>
  
  #include <errno.h>
  #include <fcntl.h>
  #include <limits.h>
  #include <sha1.h>
  #include <stddef.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include <uuid.h>
  
  #include "got_cancel.h"
  #include "got_error.h"
  #include "got_reference.h"
  #include "got_path.h"
  #include "got_worktree.h"
  #include "got_repository.h"
  #include "got_gotconfig.h"
  #include "got_object.h"
  
  #include "got_lib_worktree.h"
  #include "got_lib_gotconfig.h"
  
  static const struct got_error *
  read_meta_file(char **content, const char *path_got, const char *name)
  {
  	const struct got_error *err = NULL;
  	char *path;
  	int fd = -1;
  	ssize_t n;
  	struct stat sb;
  
  	*content = NULL;
  
  	if (asprintf(&path, "%s/%s", path_got, name) == -1) {
  		err = got_error_from_errno("asprintf");
  		path = NULL;
  		goto done;
  	}
  
  	fd = open(path, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
  	if (fd == -1) {
  		if (errno == ENOENT)
  			err = got_error_path(path, GOT_ERR_WORKTREE_META);
  		else
  			err = got_error_from_errno2("open", path);
  		goto done;
  	}
  	if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
  		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
  		    : got_error_from_errno2("flock", path));
  		goto done;
  	}
  
  	if (fstat(fd, &sb) != 0) {
  		err = got_error_from_errno2("fstat", path);
  		goto done;
  	}
  	*content = calloc(1, sb.st_size);
  	if (*content == NULL) {
  		err = got_error_from_errno("calloc");
  		goto done;
  	}
  
  	n = read(fd, *content, sb.st_size);
  	if (n != sb.st_size) {
  		err = (n == -1 ? got_error_from_errno2("read", path) :
  		    got_error_path(path, GOT_ERR_WORKTREE_META));
  		goto done;
  	}
  	if ((*content)[sb.st_size - 1] != '\n') {
  		err = got_error_path(path, GOT_ERR_WORKTREE_META);
  		goto done;
  	}
  	(*content)[sb.st_size - 1] = '\0';
  
  done:
  	if (fd != -1 && close(fd) == -1 && err == NULL)
  		err = got_error_from_errno2("close", path_got);
  	free(path);
  	if (err) {
  		free(*content);
  		*content = NULL;
  	}
  	return err;
  }
  
  static const struct got_error *
  open_worktree(struct got_worktree **worktree, const char *path)
  {
  	const struct got_error *err = NULL;
  	char *path_got;
  	char *formatstr = NULL;
  	char *uuidstr = NULL;
  	char *path_lock = NULL;
  	char *base_commit_id_str = NULL;
  	int version, fd = -1;
  	const char *errstr;
  	struct got_repository *repo = NULL;
  	int *pack_fds = NULL;
  	uint32_t uuid_status;
  
  	*worktree = NULL;
  
  	if (asprintf(&path_got, "%s/%s", path, GOT_WORKTREE_GOT_DIR) == -1) {
  		err = got_error_from_errno("asprintf");
  		path_got = NULL;
  		goto done;
  	}
  
  	if (asprintf(&path_lock, "%s/%s", path_got, GOT_WORKTREE_LOCK) == -1) {
  		err = got_error_from_errno("asprintf");
  		path_lock = NULL;
  		goto done;
  	}
  
  	fd = open(path_lock, O_RDWR | O_EXLOCK | O_NONBLOCK | O_CLOEXEC);
  	if (fd == -1) {
  		err = (errno == EWOULDBLOCK ? got_error(GOT_ERR_WORKTREE_BUSY)
  		    : got_error_from_errno2("open", path_lock));
  		goto done;
  	}
  
  	err = read_meta_file(&formatstr, path_got, GOT_WORKTREE_FORMAT);
  	if (err)
  		goto done;
  
  	version = strtonum(formatstr, 1, INT_MAX, &errstr);
  	if (errstr) {
  		err = got_error_msg(GOT_ERR_WORKTREE_META,
  		    "could not parse work tree format version number");
  		goto done;
  	}
  	if (version != GOT_WORKTREE_FORMAT_VERSION) {
  		err = got_error(GOT_ERR_WORKTREE_VERS);
  		goto done;
  	}
  
  	*worktree = calloc(1, sizeof(**worktree));
  	if (*worktree == NULL) {
  		err = got_error_from_errno("calloc");
  		goto done;
  	}
  	(*worktree)->lockfd = -1;
  
  	(*worktree)->root_path = realpath(path, NULL);
  	if ((*worktree)->root_path == NULL) {
  		err = got_error_from_errno2("realpath", path);
  		goto done;
  	}
  	err = read_meta_file(&(*worktree)->repo_path, path_got,
  	    GOT_WORKTREE_REPOSITORY);
  	if (err)
  		goto done;
  
  	err = read_meta_file(&(*worktree)->path_prefix, path_got,
  	    GOT_WORKTREE_PATH_PREFIX);
  	if (err)
  		goto done;
  
  	err = read_meta_file(&base_commit_id_str, path_got,
  	    GOT_WORKTREE_BASE_COMMIT);
  	if (err)
  		goto done;
  
  	err = read_meta_file(&uuidstr, path_got, GOT_WORKTREE_UUID);
  	if (err)
  		goto done;
  	uuid_from_string(uuidstr, &(*worktree)->uuid, &uuid_status);
  	if (uuid_status != uuid_s_ok) {
  		err = got_error_uuid(uuid_status, "uuid_from_string");
  		goto done;
  	}
  
  	err = got_repo_pack_fds_open(&pack_fds);
  	if (err)
  		goto done;
  
  	err = got_repo_open(&repo, (*worktree)->repo_path, NULL, pack_fds);
  	if (err)
  		goto done;
  
  	err = got_object_resolve_id_str(&(*worktree)->base_commit_id, repo,
  	    base_commit_id_str);
  	if (err)
  		goto done;
  
  	err = read_meta_file(&(*worktree)->head_ref_name, path_got,
  	    GOT_WORKTREE_HEAD_REF);
  	if (err)
  		goto done;
  
  	if (asprintf(&(*worktree)->gotconfig_path, "%s/%s/%s",
  	    (*worktree)->root_path,
  	    GOT_WORKTREE_GOT_DIR, GOT_GOTCONFIG_FILENAME) == -1) {
  		err = got_error_from_errno("asprintf");
  		goto done;
  	}
  
  	err = got_gotconfig_read(&(*worktree)->gotconfig,
  	    (*worktree)->gotconfig_path);
  
  	(*worktree)->root_fd = open((*worktree)->root_path,
  	    O_DIRECTORY | O_CLOEXEC);
  	if ((*worktree)->root_fd == -1) {
  		err = got_error_from_errno2("open", (*worktree)->root_path);
  		goto done;
  	}
  done:
  	if (repo) {
  		const struct got_error *close_err = got_repo_close(repo);
  		if (err == NULL)
  			err = close_err;
  	}
  	if (pack_fds) {
  		const struct got_error *pack_err =
  		    got_repo_pack_fds_close(pack_fds);
  		if (err == NULL)
  			err = pack_err;
  	}
  	free(path_got);
  	free(path_lock);
  	free(base_commit_id_str);
  	free(uuidstr);
  	free(formatstr);
  	if (err) {
  		if (fd != -1)
  			close(fd);
  		if (*worktree != NULL)
  			got_worktree_close(*worktree);
  		*worktree = NULL;
  	} else
  		(*worktree)->lockfd = fd;
  
  	return err;
  }
  
  const struct got_error *
  got_worktree_open(struct got_worktree **worktree, const char *path)
  {
  	const struct got_error *err = NULL;
  	char *worktree_path;
  
  	worktree_path = strdup(path);
  	if (worktree_path == NULL)
  		return got_error_from_errno("strdup");
  
  	for (;;) {
  		char *parent_path;
  
  		err = open_worktree(worktree, worktree_path);
  		if (err && !(err->code == GOT_ERR_ERRNO && errno == ENOENT)) {
  			free(worktree_path);
  			return err;
  		}
  		if (*worktree) {
  			free(worktree_path);
  			return NULL;
  		}
  		if (worktree_path[0] == '/' && worktree_path[1] == '\0')
  			break;
  		err = got_path_dirname(&parent_path, worktree_path);
  		if (err) {
  			if (err->code != GOT_ERR_BAD_PATH) {
  				free(worktree_path);
  				return err;
  			}
  			break;
  		}
  		free(worktree_path);
  		worktree_path = parent_path;
  	}
  
  	free(worktree_path);
  	return got_error(GOT_ERR_NOT_WORKTREE);
  }
  
  const struct got_error *
  got_worktree_close(struct got_worktree *worktree)
  {
  	const struct got_error *err = NULL;
  
  	if (worktree->lockfd != -1) {
  		if (close(worktree->lockfd) == -1)
  			err = got_error_from_errno2("close",
  			    got_worktree_get_root_path(worktree));
  	}
  	if (close(worktree->root_fd) == -1 && err == NULL)
  		err = got_error_from_errno2("close",
  		    got_worktree_get_root_path(worktree));
  	free(worktree->repo_path);
  	free(worktree->path_prefix);
  	free(worktree->base_commit_id);
  	free(worktree->head_ref_name);
  	free(worktree->root_path);
  	free(worktree->gotconfig_path);
  	got_gotconfig_free(worktree->gotconfig);
  	free(worktree);
  	return err;
  }
  
  const char *
  got_worktree_get_root_path(struct got_worktree *worktree)
  {
  	return worktree->root_path;
  }
  
  const char *
  got_worktree_get_repo_path(struct got_worktree *worktree)
  {
  	return worktree->repo_path;
  }
  
  const char *
  got_worktree_get_path_prefix(struct got_worktree *worktree)
  {
  	return worktree->path_prefix;
  }
  

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