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v261
src/basic/chase.h
60 строк
5 KB
Daan De Meyer
chase: add explicit root_fd parameter to chaseat() and drop CHASE_AT_RESOLVE_IN_ROOT
21 апр 2026, 00:35
21 апр 2026, 00:35
79862d3
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/* SPDX-License-Identifier: LGPL-2.1-or-later */ #pragma once #include "basic-forward.h" typedef enum ChaseFlags { CHASE_PREFIX_ROOT = 1 << 0, /* The specified path will be prefixed by the specified root before beginning the iteration */ CHASE_NONEXISTENT = 1 << 1, /* It's OK if the path doesn't actually exist. */ CHASE_NO_AUTOFS = 1 << 2, /* Return -EREMOTE if autofs mount point found */ CHASE_TRIGGER_AUTOFS = 1 << 3, /* Use open_tree() rather than openat() to trigger autofs mount */ CHASE_SAFE = 1 << 4, /* Return -EPERM if we ever traverse from unprivileged to privileged files or directories */ CHASE_TRAIL_SLASH = 1 << 5, /* Any trailing slash will be preserved */ CHASE_STEP = 1 << 6, /* Just execute a single step of the normalization */ CHASE_NOFOLLOW = 1 << 7, /* Do not follow the path's right-most component. With ret_fd, when the path's * right-most component refers to symlink, return O_PATH fd of the symlink. */ CHASE_WARN = 1 << 8, /* Emit an appropriate warning when an error is encountered. * Note: this may do an NSS lookup, hence this flag cannot be used in PID 1. */ CHASE_PROHIBIT_SYMLINKS = 1 << 9, /* Refuse all symlinks */ CHASE_PARENT = 1 << 10, /* Chase the parent directory of the given path. Note that the * full path is still stored in ret_path and only the returned * file descriptor will point to the parent directory. Note that * the result path is the root or '.', then the file descriptor * also points to the result path even if this flag is set. * When this specified, chase() will succeed with 1 even if the * file points to the last path component does not exist. */ CHASE_MKDIR_0755 = 1 << 11, /* Create any missing directories in the given path. */ CHASE_EXTRACT_FILENAME = 1 << 12, /* Only return the last component of the resolved path */ CHASE_MUST_BE_DIRECTORY = 1 << 13, /* Fail if returned inode fd is not a dir */ CHASE_MUST_BE_REGULAR = 1 << 14, /* Fail if returned inode fd is not a regular file */ CHASE_MUST_BE_SOCKET = 1 << 15, /* Fail if returned inode fd is not a socket */ } ChaseFlags; int statx_unsafe_transition(const struct statx *a, const struct statx *b); bool stat_unsafe_transition(const struct stat *a, const struct stat *b); /* How many iterations to execute before returning -ELOOP */ #define CHASE_MAX 128U int chase(const char *path_with_prefix, const char *root, ChaseFlags flags, char **ret_path, int *ret_fd); int chaseat_prefix_root(const char *path, const char *root, char **ret); int chase_extract_filename(const char *path, const char *root, char **ret); int chase_and_open(const char *path, const char *root, ChaseFlags chase_flags, int open_flags, char **ret_path); int chase_and_opendir(const char *path, const char *root, ChaseFlags chase_flags, char **ret_path, DIR **ret_dir); int chase_and_stat(const char *path, const char *root, ChaseFlags chase_flags, char **ret_path, struct stat *ret_stat); int chase_and_access(const char *path, const char *root, ChaseFlags chase_flags, int access_mode, char **ret_path); int chase_and_fopen_unlocked(const char *path, const char *root, ChaseFlags chase_flags, const char *open_flags, char **ret_path, FILE **ret_file); int chase_and_unlink(const char *path, const char *root, ChaseFlags chase_flags, int unlink_flags, char **ret_path); int chase_and_open_parent(const char *path, const char *root, ChaseFlags chase_flags, char **ret_filename); int chaseat(int root_fd, int dir_fd, const char *path, ChaseFlags flags, char **ret_path, int *ret_fd); int chase_and_openat(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, int open_flags, char **ret_path); int chase_and_opendirat(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, char **ret_path, DIR **ret_dir); int chase_and_statat(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, char **ret_path, struct stat *ret_stat); int chase_and_accessat(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, int access_mode, char **ret_path); int chase_and_fopenat_unlocked(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, const char *open_flags, char **ret_path, FILE **ret_file); int chase_and_unlinkat(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, int unlink_flags, char **ret_path); int chase_and_open_parent_at(int root_fd, int dir_fd, const char *path, ChaseFlags chase_flags, char **ret_filename);