src/basic/path-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 /***
   5   This file is part of systemd.
   6
   7   Copyright 2010-2012 Lennart Poettering
   8 ***/
   9
  10 #include <alloca.h>
  11 #include <stdbool.h>
  12 #include <stddef.h>
  13
  14 #include "macro.h"
  15 #include "string-util.h"
  16 #include "time-util.h"
  17
  18 #if HAVE_SPLIT_BIN
  19 #  define PATH_SBIN_BIN(x) x "sbin:" x "bin"
  20 #else
  21 #  define PATH_SBIN_BIN(x) x "bin"
  22 #endif
  23
  24 #define DEFAULT_PATH_NORMAL PATH_SBIN_BIN("/usr/local/") ":" PATH_SBIN_BIN("/usr/")
  25 #define DEFAULT_PATH_SPLIT_USR DEFAULT_PATH_NORMAL ":" PATH_SBIN_BIN("/")
  26
  27 #if HAVE_SPLIT_USR
  28 #  define DEFAULT_PATH DEFAULT_PATH_SPLIT_USR
  29 #else
  30 #  define DEFAULT_PATH DEFAULT_PATH_NORMAL
  31 #endif
  32
  33 bool is_path(const char *p) _pure_;
  34 int path_split_and_make_absolute(const char *p, char ***ret);
  35 bool path_is_absolute(const char *p) _pure_;
  36 char* path_make_absolute(const char *p, const char *prefix);
  37 int safe_getcwd(char **ret);
  38 int path_make_absolute_cwd(const char *p, char **ret);
  39 int path_make_relative(const char *from_dir, const char *to_path, char **_r);
  40 char* path_kill_slashes(char *path);
  41 char* path_startswith(const char *path, const char *prefix) _pure_;
  42 int path_compare(const char *a, const char *b) _pure_;
  43 bool path_equal(const char *a, const char *b) _pure_;
  44 bool path_equal_or_files_same(const char *a, const char *b, int flags);
  45 char* path_join(const char *root, const char *path, const char *rest);
  46
  47 static inline bool path_equal_ptr(const char *a, const char *b) {
  48         return !!a == !!b && (!a || path_equal(a, b));
  49 }
  50
  51 /* Note: the search terminates on the first NULL item. */
  52 #define PATH_IN_SET(p, ...)                                     \
  53         ({                                                      \
  54                 char **s;                                       \
  55                 bool _found = false;                            \
  56                 STRV_FOREACH(s, STRV_MAKE(__VA_ARGS__))         \
  57                         if (path_equal(p, *s)) {                \
  58                                _found = true;                   \
  59                                break;                           \
  60                         }                                       \
  61                 _found;                                         \
  62         })
  63
  64 #define PATH_STARTSWITH_SET(p, ...)                             \
  65         ({                                                      \
  66                 char **s;                                       \
  67                 bool _found = false;                            \
  68                 STRV_FOREACH(s, STRV_MAKE(__VA_ARGS__))         \
  69                         if (path_startswith(p, *s)) {           \
  70                                _found = true;                   \
  71                                break;                           \
  72                         }                                       \
  73                 _found;                                         \
  74         })
  75
  76 int path_strv_make_absolute_cwd(char **l);
  77 char** path_strv_resolve(char **l, const char *root);
  78 char** path_strv_resolve_uniq(char **l, const char *root);
  79
  80 int find_binary(const char *name, char **filename);
  81
  82 bool paths_check_timestamp(const char* const* paths, usec_t *paths_ts_usec, bool update);
  83
  84 int fsck_exists(const char *fstype);
  85 int mkfs_exists(const char *fstype);
  86
  87 /* Iterates through the path prefixes of the specified path, going up
  88  * the tree, to root. Also returns "" (and not "/"!) for the root
  89  * directory. Excludes the specified directory itself */
  90 #define PATH_FOREACH_PREFIX(prefix, path) \
  91         for (char *_slash = ({ path_kill_slashes(strcpy(prefix, path)); streq(prefix, "/") ? NULL : strrchr(prefix, '/'); }); _slash && ((*_slash = 0), true); _slash = strrchr((prefix), '/'))
  92
  93 /* Same as PATH_FOREACH_PREFIX but also includes the specified path itself */
  94 #define PATH_FOREACH_PREFIX_MORE(prefix, path) \
  95         for (char *_slash = ({ path_kill_slashes(strcpy(prefix, path)); if (streq(prefix, "/")) prefix[0] = 0; strrchr(prefix, 0); }); _slash && ((*_slash = 0), true); _slash = strrchr((prefix), '/'))
  96
  97 char *prefix_root(const char *root, const char *path);
  98
  99 /* Similar to prefix_root(), but returns an alloca() buffer, or
 100  * possibly a const pointer into the path parameter */
 101 #define prefix_roota(root, path)                                        \
 102         ({                                                              \
 103                 const char* _path = (path), *_root = (root), *_ret;     \
 104                 char *_p, *_n;                                          \
 105                 size_t _l;                                              \
 106                 while (_path[0] == '/' && _path[1] == '/')              \
 107                         _path ++;                                       \
 108                 if (isempty(_root) || path_equal(_root, "/"))           \
 109                         _ret = _path;                                   \
 110                 else {                                                  \
 111                         _l = strlen(_root) + 1 + strlen(_path) + 1;     \
 112                         _n = alloca(_l);                                \
 113                         _p = stpcpy(_n, _root);                         \
 114                         while (_p > _n && _p[-1] == '/')                \
 115                                 _p--;                                   \
 116                         if (_path[0] != '/')                            \
 117                                 *(_p++) = '/';                          \
 118                         strcpy(_p, _path);                              \
 119                         _ret = _n;                                      \
 120                 }                                                       \
 121                 _ret;                                                   \
 122         })
 123
 124 int parse_path_argument_and_warn(const char *path, bool suppress_root, char **arg);
 125
 126 char* dirname_malloc(const char *path);
 127 const char *last_path_component(const char *path);
 128
 129 bool filename_is_valid(const char *p) _pure_;
 130 bool path_is_normalized(const char *p) _pure_;
 131
 132 char *file_in_same_dir(const char *path, const char *filename);
 133
 134 bool hidden_or_backup_file(const char *filename) _pure_;
 135
 136 bool is_device_path(const char *path);
 137 bool is_deviceallow_pattern(const char *path);
 138
 139 int systemd_installation_has_version(const char *root, unsigned minimal_version);
 140
 141 bool dot_or_dot_dot(const char *path);
 142
 143 static inline const char *skip_dev_prefix(const char *p) {
 144         const char *e;
 145
 146         /* Drop any /dev prefix if there is any */
 147
 148         e = path_startswith(p, "/dev/");
 149
 150         return e ?: p;
 151 }