return 0;
}
-int rm_rf_children(int fd, bool only_dirs, bool honour_sticky) {
+int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
DIR *d;
int ret = 0;
assert(fd >= 0);
/* This returns the first error we run into, but nevertheless
- * tries to go on */
+ * tries to go on. This closes the passed fd. */
d = fdopendir(fd);
if (!d) {
for (;;) {
struct dirent buf, *de;
- bool is_dir, keep_around = false;
+ bool is_dir, keep_around;
+ struct stat st;
int r;
r = readdir_r(d, &buf, &de);
if (streq(de->d_name, ".") || streq(de->d_name, ".."))
continue;
- if (de->d_type == DT_UNKNOWN) {
- struct stat st;
-
+ if (de->d_type == DT_UNKNOWN ||
+ honour_sticky ||
+ (de->d_type == DT_DIR && root_dev)) {
if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
if (ret == 0 && errno != ENOENT)
ret = -errno;
continue;
}
- if (honour_sticky)
- keep_around =
- (st.st_uid == 0 || st.st_uid == getuid()) &&
- (st.st_mode & S_ISVTX);
-
is_dir = S_ISDIR(st.st_mode);
-
+ keep_around =
+ honour_sticky &&
+ (st.st_uid == 0 || st.st_uid == getuid()) &&
+ (st.st_mode & S_ISVTX);
} else {
- if (honour_sticky) {
- struct stat st;
-
- if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
- if (ret == 0 && errno != ENOENT)
- ret = -errno;
- continue;
- }
-
- keep_around =
- (st.st_uid == 0 || st.st_uid == getuid()) &&
- (st.st_mode & S_ISVTX);
- }
-
is_dir = de->d_type == DT_DIR;
+ keep_around = false;
}
if (is_dir) {
int subdir_fd;
- subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
+ /* if root_dev is set, remove subdirectories only, if device is same as dir */
+ if (root_dev && st.st_dev != root_dev->st_dev)
+ continue;
+
+ subdir_fd = openat(fd, de->d_name,
+ O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
if (subdir_fd < 0) {
if (ret == 0 && errno != ENOENT)
ret = -errno;
continue;
}
- r = rm_rf_children(subdir_fd, only_dirs, honour_sticky);
+ r = rm_rf_children(subdir_fd, only_dirs, honour_sticky, root_dev);
if (r < 0 && ret == 0)
ret = r;
return 0;
}
- r = rm_rf_children(fd, only_dirs, honour_sticky);
+ r = rm_rf_children(fd, only_dirs, honour_sticky, NULL);
if (delete_root) {
}
bool in_initrd(void) {
- static bool checked=false;
- static bool is_in_initrd=false;
-
- if (!checked) {
- struct stat sb;
- if (stat("/", &sb) == 0) {
- is_in_initrd = (sb.st_dev == 1);
- checked = true;
- }
- }
+ static int saved = -1;
+
+ if (saved < 0)
+ saved = access("/etc/initrd-release", F_OK) >= 0;
- return is_in_initrd;
+ return saved;
}