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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include "label.h"
#include "util.h"
#include "mkdir.h"
static int is_dir(const char* path) {
struct stat st;
if (stat(path, &st) < 0)
return -errno;
return S_ISDIR(st.st_mode);
}
char* path_startswith(const char *path, const char *prefix) {
assert(path);
assert(prefix);
if ((path[0] == '/') != (prefix[0] == '/'))
return NULL;
for (;;) {
size_t a, b;
path += strspn(path, "/");
prefix += strspn(prefix, "/");
if (*prefix == 0)
return (char*) path;
if (*path == 0)
return NULL;
a = strcspn(path, "/");
b = strcspn(prefix, "/");
if (a != b)
return NULL;
if (memcmp(path, prefix, a) != 0)
return NULL;
path += a;
prefix += b;
}
}
static int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, bool apply) {
const char *p, *e;
int r;
assert(path);
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;
char buf[PATH_MAX + 1];
p = buf;
assert(e-path < sizeof(buf));
memcpy(buf, path, e-path);
buf[e-path] = 0;
r = is_dir(p);
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 = label_mkdir(t, mode, apply);
if (r < 0 && errno != EEXIST)
return -errno;
}
}
int mkdir_parents(const char *path, mode_t mode) {
return mkdir_parents_internal(NULL, path, mode, false);
}
int mkdir_parents_label(const char *path, mode_t mode) {
return mkdir_parents_internal(NULL, path, mode, true);
}
static int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, bool apply) {
int r;
/* Like mkdir -p */
r = mkdir_parents_internal(prefix, path, mode, apply);
if (r < 0)
return r;
r = label_mkdir(path, mode, apply);
if (r < 0 && (errno != EEXIST || is_dir(path) <= 0))
return -errno;
return 0;
}
int mkdir_p(const char *path, mode_t mode) {
return mkdir_p_internal(NULL, path, mode, false);
}
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