basic,shared: move a bunch of files to src/shared/
The goal is to move everything that requires selinux or smack away from src/basic/. This means that src/basic/label.[ch] must move, which implies btrfs-util.[ch], copy.[ch], and a bunch of other files which form a cluster of internal use. This is just moving text around, so there should be no functional difference. test-blockdev-util is new, because path_is_encrypted() is moved to blockdev-util.c, and so far we didn't have any tests for code there.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
@@ -0,0 +1,316 @@
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "btrfs-util.h"
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#include "cgroup-util.h"
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#include "dirent-util.h"
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#include "fd-util.h"
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#include "log.h"
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#include "macro.h"
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#include "mountpoint-util.h"
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#include "path-util.h"
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#include "rm-rf.h"
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#include "stat-util.h"
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#include "string-util.h"
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static bool is_physical_fs(const struct statfs *sfs) {
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return !is_temporary_fs(sfs) && !is_cgroup_fs(sfs);
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}
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static int patch_dirfd_mode(
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int dfd,
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mode_t *ret_old_mode) {
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struct stat st;
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assert(dfd >= 0);
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assert(ret_old_mode);
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if (fstat(dfd, &st) < 0)
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return -errno;
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if (!S_ISDIR(st.st_mode))
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return -ENOTDIR;
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if (FLAGS_SET(st.st_mode, 0700)) /* Already set? */
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return -EACCES; /* original error */
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if (st.st_uid != geteuid()) /* this only works if the UID matches ours */
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return -EACCES;
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if (fchmod(dfd, (st.st_mode | 0700) & 07777) < 0)
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return -errno;
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*ret_old_mode = st.st_mode;
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return 0;
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}
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int unlinkat_harder(int dfd, const char *filename, int unlink_flags, RemoveFlags remove_flags) {
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mode_t old_mode;
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int r;
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/* Like unlinkat(), but tries harder: if we get EACCESS we'll try to set the r/w/x bits on the
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* directory. This is useful if we run unprivileged and have some files where the w bit is
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* missing. */
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if (unlinkat(dfd, filename, unlink_flags) >= 0)
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return 0;
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if (errno != EACCES || !FLAGS_SET(remove_flags, REMOVE_CHMOD))
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return -errno;
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r = patch_dirfd_mode(dfd, &old_mode);
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if (r < 0)
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return r;
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if (unlinkat(dfd, filename, unlink_flags) < 0) {
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r = -errno;
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/* Try to restore the original access mode if this didn't work */
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(void) fchmod(dfd, old_mode);
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return r;
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}
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if (FLAGS_SET(remove_flags, REMOVE_CHMOD_RESTORE) && fchmod(dfd, old_mode) < 0)
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return -errno;
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/* If this worked, we won't reset the old mode by default, since we'll need it for other entries too,
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* and we should destroy the whole thing */
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return 0;
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}
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int fstatat_harder(int dfd,
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const char *filename,
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struct stat *ret,
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int fstatat_flags,
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RemoveFlags remove_flags) {
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mode_t old_mode;
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int r;
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/* Like unlink_harder() but does the same for fstatat() */
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if (fstatat(dfd, filename, ret, fstatat_flags) >= 0)
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return 0;
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if (errno != EACCES || !FLAGS_SET(remove_flags, REMOVE_CHMOD))
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return -errno;
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r = patch_dirfd_mode(dfd, &old_mode);
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if (r < 0)
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return r;
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if (fstatat(dfd, filename, ret, fstatat_flags) < 0) {
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r = -errno;
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(void) fchmod(dfd, old_mode);
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return r;
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}
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if (FLAGS_SET(remove_flags, REMOVE_CHMOD_RESTORE) && fchmod(dfd, old_mode) < 0)
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return -errno;
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return 0;
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}
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int rm_rf_children(int fd, RemoveFlags flags, struct stat *root_dev) {
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_cleanup_closedir_ DIR *d = NULL;
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struct dirent *de;
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int ret = 0, r;
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struct statfs sfs;
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assert(fd >= 0);
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/* This returns the first error we run into, but nevertheless tries to go on. This closes the passed
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* fd, in all cases, including on failure.. */
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if (!(flags & REMOVE_PHYSICAL)) {
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r = fstatfs(fd, &sfs);
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if (r < 0) {
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safe_close(fd);
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return -errno;
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}
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if (is_physical_fs(&sfs)) {
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/* We refuse to clean physical file systems with this call,
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* unless explicitly requested. This is extra paranoia just
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* to be sure we never ever remove non-state data. */
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_cleanup_free_ char *path = NULL;
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(void) fd_get_path(fd, &path);
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log_error("Attempted to remove disk file system under \"%s\", and we can't allow that.",
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strna(path));
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safe_close(fd);
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return -EPERM;
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}
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}
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d = fdopendir(fd);
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if (!d) {
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safe_close(fd);
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return errno == ENOENT ? 0 : -errno;
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}
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FOREACH_DIRENT_ALL(de, d, return -errno) {
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bool is_dir;
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struct stat st;
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if (dot_or_dot_dot(de->d_name))
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continue;
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if (de->d_type == DT_UNKNOWN ||
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(de->d_type == DT_DIR && (root_dev || (flags & REMOVE_SUBVOLUME)))) {
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r = fstatat_harder(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW, flags);
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if (r < 0) {
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if (ret == 0 && r != -ENOENT)
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ret = r;
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continue;
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}
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is_dir = S_ISDIR(st.st_mode);
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} else
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is_dir = de->d_type == DT_DIR;
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if (is_dir) {
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_cleanup_close_ int subdir_fd = -1;
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/* if root_dev is set, remove subdirectories only if device is same */
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if (root_dev && st.st_dev != root_dev->st_dev)
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continue;
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subdir_fd = openat(fd, de->d_name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
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if (subdir_fd < 0) {
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if (ret == 0 && errno != ENOENT)
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ret = -errno;
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continue;
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}
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/* Stop at mount points */
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r = fd_is_mount_point(fd, de->d_name, 0);
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if (r < 0) {
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if (ret == 0 && r != -ENOENT)
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ret = r;
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continue;
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}
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if (r > 0)
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continue;
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if ((flags & REMOVE_SUBVOLUME) && btrfs_might_be_subvol(&st)) {
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/* This could be a subvolume, try to remove it */
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r = btrfs_subvol_remove_fd(fd, de->d_name, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
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if (r < 0) {
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if (!IN_SET(r, -ENOTTY, -EINVAL)) {
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if (ret == 0)
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ret = r;
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continue;
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}
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/* ENOTTY, then it wasn't a btrfs subvolume, continue below. */
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} else
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/* It was a subvolume, continue. */
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continue;
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}
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/* We pass REMOVE_PHYSICAL here, to avoid doing the fstatfs() to check the file
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* system type again for each directory */
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r = rm_rf_children(TAKE_FD(subdir_fd), flags | REMOVE_PHYSICAL, root_dev);
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if (r < 0 && ret == 0)
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ret = r;
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r = unlinkat_harder(fd, de->d_name, AT_REMOVEDIR, flags);
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if (r < 0 && r != -ENOENT && ret == 0)
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ret = r;
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} else if (!(flags & REMOVE_ONLY_DIRECTORIES)) {
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r = unlinkat_harder(fd, de->d_name, 0, flags);
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if (r < 0 && r != -ENOENT && ret == 0)
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ret = r;
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}
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}
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return ret;
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}
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int rm_rf(const char *path, RemoveFlags flags) {
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int fd, r;
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struct statfs s;
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assert(path);
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/* For now, don't support dropping subvols when also only dropping directories, since we can't do
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* this race-freely. */
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if (FLAGS_SET(flags, REMOVE_ONLY_DIRECTORIES|REMOVE_SUBVOLUME))
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return -EINVAL;
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/* We refuse to clean the root file system with this call. This is extra paranoia to never cause a
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* really seriously broken system. */
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if (path_equal_or_files_same(path, "/", AT_SYMLINK_NOFOLLOW))
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return log_error_errno(SYNTHETIC_ERRNO(EPERM),
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"Attempted to remove entire root file system (\"%s\"), and we can't allow that.",
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path);
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if (FLAGS_SET(flags, REMOVE_SUBVOLUME | REMOVE_ROOT | REMOVE_PHYSICAL)) {
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/* Try to remove as subvolume first */
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r = btrfs_subvol_remove(path, BTRFS_REMOVE_RECURSIVE|BTRFS_REMOVE_QUOTA);
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if (r >= 0)
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return r;
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if (FLAGS_SET(flags, REMOVE_MISSING_OK) && r == -ENOENT)
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return 0;
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if (!IN_SET(r, -ENOTTY, -EINVAL, -ENOTDIR))
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return r;
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/* Not btrfs or not a subvolume */
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}
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fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
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if (fd < 0) {
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if (FLAGS_SET(flags, REMOVE_MISSING_OK) && errno == ENOENT)
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return 0;
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if (!IN_SET(errno, ENOTDIR, ELOOP))
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return -errno;
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if (FLAGS_SET(flags, REMOVE_ONLY_DIRECTORIES))
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return 0;
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if (FLAGS_SET(flags, REMOVE_ROOT)) {
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if (!FLAGS_SET(flags, REMOVE_PHYSICAL)) {
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if (statfs(path, &s) < 0)
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return -errno;
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if (is_physical_fs(&s))
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return log_error_errno(SYNTHETIC_ERRNO(EPERM),
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"Attempted to remove files from a disk file system under \"%s\", refusing.",
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path);
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}
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if (unlink(path) < 0) {
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if (FLAGS_SET(flags, REMOVE_MISSING_OK) && errno == ENOENT)
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return 0;
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return -errno;
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}
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}
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return 0;
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}
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r = rm_rf_children(fd, flags, NULL);
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if (FLAGS_SET(flags, REMOVE_ROOT) &&
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rmdir(path) < 0 &&
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r >= 0 &&
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(!FLAGS_SET(flags, REMOVE_MISSING_OK) || errno != ENOENT))
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r = -errno;
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return r;
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}
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