diff options
Diffstat (limited to 'src/shared/rm-rf.c')
| -rw-r--r-- | src/shared/rm-rf.c | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/src/shared/rm-rf.c b/src/shared/rm-rf.c deleted file mode 100644 index bafd483be2..0000000000 --- a/src/shared/rm-rf.c +++ /dev/null @@ -1,224 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2015 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 "util.h" -#include "path-util.h" -#include "btrfs-util.h" -#include "rm-rf.h" - -int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) { - _cleanup_closedir_ DIR *d = NULL; - int ret = 0, r; - - assert(fd >= 0); - - /* This returns the first error we run into, but nevertheless - * tries to go on. This closes the passed fd. */ - - if (!(flags & REMOVE_PHYSICAL)) { - - r = fd_is_temporary_fs(fd); - if (r < 0) { - safe_close(fd); - return r; - } - - if (!r) { - /* We refuse to clean physical file systems - * with this call, unless explicitly - * requested. This is extra paranoia just to - * be sure we never ever remove non-state - * data */ - - log_error("Attempted to remove disk file system, and we can't allow that."); - safe_close(fd); - return -EPERM; - } - } - - d = fdopendir(fd); - if (!d) { - safe_close(fd); - return errno == ENOENT ? 0 : -errno; - } - - for (;;) { - struct dirent *de; - bool is_dir; - struct stat st; - - errno = 0; - de = readdir(d); - if (!de) { - if (errno != 0 && ret == 0) - ret = -errno; - return ret; - } - - if (streq(de->d_name, ".") || streq(de->d_name, "..")) - continue; - - if (de->d_type == DT_UNKNOWN || - (de->d_type == DT_DIR && (root_dev || (flags & REMOVE_SUBVOLUME)))) { - if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - continue; - } - - is_dir = S_ISDIR(st.st_mode); - } else - is_dir = de->d_type == DT_DIR; - - if (is_dir) { - int subdir_fd; - - /* if root_dev is set, remove subdirectories only if device is same */ - 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; - } - - /* Stop at mount points */ - r = fd_is_mount_point(fd, de->d_name, 0); - if (r < 0) { - if (ret == 0 && r != -ENOENT) - ret = r; - - safe_close(subdir_fd); - continue; - } - if (r) { - safe_close(subdir_fd); - continue; - } - - if ((flags & REMOVE_SUBVOLUME) && st.st_ino == 256) { - - /* This could be a subvolume, try to remove it */ - - r = btrfs_subvol_remove_fd(fd, de->d_name, true); - if (r < 0) { - if (r != -ENOTTY && r != -EINVAL) { - if (ret == 0) - ret = r; - - safe_close(subdir_fd); - continue; - } - - /* ENOTTY, then it wasn't a - * btrfs subvolume, continue - * below. */ - } else { - /* It was a subvolume, continue. */ - safe_close(subdir_fd); - continue; - } - } - - /* We pass REMOVE_PHYSICAL here, to avoid - * doing the fstatfs() to check the file - * system type again for each directory */ - r = rm_rf_children(subdir_fd, flags | REMOVE_PHYSICAL, root_dev); - if (r < 0 && ret == 0) - ret = r; - - if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - } - - } else if (!(flags & REMOVE_ONLY_DIRECTORIES)) { - - if (unlinkat(fd, de->d_name, 0) < 0) { - if (ret == 0 && errno != ENOENT) - ret = -errno; - } - } - } -} - -int rm_rf(const char *path, RemoveFlags flags) { - int fd, r; - struct statfs s; - - assert(path); - - /* We refuse to clean the root file system with this - * call. This is extra paranoia to never cause a really - * seriously broken system. */ - if (path_equal(path, "/")) { - log_error("Attempted to remove entire root file system, and we can't allow that."); - return -EPERM; - } - - if ((flags & (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) == (REMOVE_SUBVOLUME|REMOVE_ROOT|REMOVE_PHYSICAL)) { - /* Try to remove as subvolume first */ - r = btrfs_subvol_remove(path, true); - if (r >= 0) - return r; - - if (r != -ENOTTY && r != -EINVAL) - return r; - - /* Not btrfs or not a subvolume */ - } - - fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME); - if (fd < 0) { - - if (errno != ENOTDIR && errno != ELOOP) - return -errno; - - if (!(flags & REMOVE_PHYSICAL)) { - if (statfs(path, &s) < 0) - return -errno; - - if (!is_temporary_fs(&s)) { - log_error("Attempted to remove disk file system, and we can't allow that."); - return -EPERM; - } - } - - if ((flags & REMOVE_ROOT) && !(flags & REMOVE_ONLY_DIRECTORIES)) - if (unlink(path) < 0 && errno != ENOENT) - return -errno; - - return 0; - } - - r = rm_rf_children(fd, flags, NULL); - - if (flags & REMOVE_ROOT) { - if (rmdir(path) < 0) { - if (r == 0 && errno != ENOENT) - r = -errno; - } - } - - return r; -} |