summaryrefslogtreecommitdiff
path: root/src/basic/mkdir.c
blob: 1f318252a98e1e0445f54431a3ff8b1e9449f7f4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/* SPDX-License-Identifier: LGPL-2.1+ */

#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include <sys/stat.h>

#include "alloc-util.h"
#include "format-util.h"
#include "fs-util.h"
#include "macro.h"
#include "mkdir.h"
#include "path-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "user-util.h"

int mkdir_safe_internal(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdir_func_t _mkdir) {
        struct stat st;
        int r;

        assert(_mkdir != mkdir);

        if (_mkdir(path, mode) >= 0) {
                r = chmod_and_chown(path, mode, uid, gid);
                if (r < 0)
                        return r;
        }

        if (lstat(path, &st) < 0)
                return -errno;

        if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) {
                _cleanup_free_ char *p = NULL;

                r = chase_symlinks(path, NULL, CHASE_NONEXISTENT, &p, NULL);
                if (r < 0)
                        return r;
                if (r == 0)
                        return mkdir_safe_internal(p, mode, uid, gid,
                                                   flags & ~MKDIR_FOLLOW_SYMLINK,
                                                   _mkdir);

                if (lstat(p, &st) < 0)
                        return -errno;
        }

        if (!S_ISDIR(st.st_mode)) {
                log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
                         "Path \"%s\" already exists and is not a directory, refusing.", path);
                return -ENOTDIR;
        }
        if ((st.st_mode & 0007) > (mode & 0007) ||
            (st.st_mode & 0070) > (mode & 0070) ||
            (st.st_mode & 0700) > (mode & 0700)) {
                log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
                         "Directory \"%s\" already exists, but has mode %04o that is too permissive (%04o was requested), refusing.",
                         path, st.st_mode & 0777, mode);
                return -EEXIST;
        }
        if ((uid != UID_INVALID && st.st_uid != uid) ||
            (gid != GID_INVALID && st.st_gid != gid)) {
                char u[DECIMAL_STR_MAX(uid_t)] = "-", g[DECIMAL_STR_MAX(gid_t)] = "-";

                if (uid != UID_INVALID)
                        xsprintf(u, UID_FMT, uid);
                if (gid != UID_INVALID)
                        xsprintf(g, GID_FMT, gid);
                log_full(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG,
                         "Directory \"%s\" already exists, but is owned by "UID_FMT":"GID_FMT" (%s:%s was requested), refusing.",
                         path, st.st_uid, st.st_gid, u, g);
                return -EEXIST;
        }

        return 0;
}

int mkdir_errno_wrapper(const char *pathname, mode_t mode) {
        if (mkdir(pathname, mode) < 0)
                return -errno;
        return 0;
}

int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) {
        if (mkdirat(dirfd, pathname, mode) < 0)
                return -errno;
        return 0;
}

int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
        return mkdir_safe_internal(path, mode, uid, gid, flags, mkdir_errno_wrapper);
}

int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
        const char *p, *e;
        int r;

        assert(path);
        assert(_mkdir != mkdir);

        if (prefix && !path_startswith(path, prefix))
                return -ENOTDIR;

        /* return immediately if directory exists */
        e = strrchr(path, '/');
        if (!e)
                return -EINVAL;

        if (e == path)
                return 0;

        p = strndupa(path, e - path);
        r = is_dir(p, true);
        if (r > 0)
                return 0;
        if (r == 0)
                return -ENOTDIR;

        /* create every parent directory in the path, except the last component */
        p = path + strspn(path, "/");
        for (;;) {
                char t[strlen(path) + 1];

                e = p + strcspn(p, "/");
                p = e + strspn(e, "/");

                /* Is this the last component? If so, then we're done */
                if (*p == 0)
                        return 0;

                memcpy(t, path, e - path);
                t[e-path] = 0;

                if (prefix && path_startswith(prefix, t))
                        continue;

                r = _mkdir(t, mode);
                if (r < 0 && r != -EEXIST)
                        return r;
        }
}

int mkdir_parents(const char *path, mode_t mode) {
        return mkdir_parents_internal(NULL, path, mode, mkdir_errno_wrapper);
}

int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, mkdir_func_t _mkdir) {
        int r;

        /* Like mkdir -p */

        assert(_mkdir != mkdir);

        r = mkdir_parents_internal(prefix, path, mode, _mkdir);
        if (r < 0)
                return r;

        r = _mkdir(path, mode);
        if (r < 0 && (r != -EEXIST || is_dir(path, true) <= 0))
                return r;

        return 0;
}

int mkdir_p(const char *path, mode_t mode) {
        return mkdir_p_internal(NULL, path, mode, mkdir_errno_wrapper);
}