./tools/notsd-move

1 files changed, 0 insertions, 167 deletions

diff --git a/src/shared/switch-root.c b/src/shared/switch-root.c
deleted file mode 100644
index 4eff4f692e..0000000000
--- a/src/shared/switch-root.c
+++ /dev/null
@@ -1,167 +0,0 @@
-/***
-  This file is part of systemd.
-
-  Copyright 2012 Harald Hoyer, 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 <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <sys/mount.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "base-filesystem.h"
-#include "fd-util.h"
-#include "log.h"
-#include "missing.h"
-#include "mkdir.h"
-#include "path-util.h"
-#include "rm-rf.h"
-#include "stdio-util.h"
-#include "string-util.h"
-#include "switch-root.h"
-#include "user-util.h"
-#include "util.h"
-
-int switch_root(const char *new_root, const char *oldroot, bool detach_oldroot,  unsigned long mountflags) {
-
-        /*  Don't try to unmount/move the old "/", there's no way to do it. */
-        static const char move_mounts[] =
-                "/dev\0"
-                "/proc\0"
-                "/sys\0"
-                "/run\0";
-
-        _cleanup_close_ int old_root_fd = -1;
-        struct stat new_root_stat;
-        bool old_root_remove;
-        const char *i, *temporary_old_root;
-
-        if (path_equal(new_root, "/"))
-                return 0;
-
-        temporary_old_root = strjoina(new_root, oldroot);
-        mkdir_p_label(temporary_old_root, 0755);
-
-        old_root_remove = in_initrd();
-
-        if (stat(new_root, &new_root_stat) < 0)
-                return log_error_errno(errno, "Failed to stat directory %s: %m", new_root);
-
-        /* Work-around for kernel design: the kernel refuses switching
-         * root if any file systems are mounted MS_SHARED. Hence
-         * remount them MS_PRIVATE here as a work-around.
-         *
-         * https://bugzilla.redhat.com/show_bug.cgi?id=847418 */
-        if (mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) < 0)
-                log_warning_errno(errno, "Failed to make \"/\" private mount: %m");
-
-        NULSTR_FOREACH(i, move_mounts) {
-                char new_mount[PATH_MAX];
-                struct stat sb;
-                size_t n;
-
-                n = snprintf(new_mount, sizeof new_mount, "%s%s", new_root, i);
-                if (n >= sizeof new_mount) {
-                        bool move = mountflags & MS_MOVE;
-
-                        log_warning("New path is too long, %s: %s%s",
-                                    move ? "forcing unmount instead" : "ignoring",
-                                    new_root, i);
-
-                        if (move)
-                                if (umount2(i, MNT_FORCE) < 0)
-                                        log_warning_errno(errno, "Failed to unmount %s: %m", i);
-                        continue;
-                }
-
-                mkdir_p_label(new_mount, 0755);
-
-                if (stat(new_mount, &sb) < 0 ||
-                    sb.st_dev != new_root_stat.st_dev) {
-
-                        /* Mount point seems to be mounted already or
-                         * stat failed. Unmount the old mount point. */
-                        if (umount2(i, MNT_DETACH) < 0)
-                                log_warning_errno(errno, "Failed to unmount %s: %m", i);
-                        continue;
-                }
-
-                if (mount(i, new_mount, NULL, mountflags, NULL) < 0) {
-                        if (mountflags & MS_MOVE) {
-                                log_error_errno(errno, "Failed to move mount %s to %s, forcing unmount: %m", i, new_mount);
-
-                                if (umount2(i, MNT_FORCE) < 0)
-                                        log_warning_errno(errno, "Failed to unmount %s: %m", i);
-
-                        } else if (mountflags & MS_BIND)
-                                log_error_errno(errno, "Failed to bind mount %s to %s: %m", i, new_mount);
-                }
-        }
-
-        /* Do not fail, if base_filesystem_create() fails. Not all
-         * switch roots are like base_filesystem_create() wants them
-         * to look like. They might even boot, if they are RO and
-         * don't have the FS layout. Just ignore the error and
-         * switch_root() nevertheless. */
-        (void) base_filesystem_create(new_root, UID_INVALID, GID_INVALID);
-
-        if (chdir(new_root) < 0)
-                return log_error_errno(errno, "Failed to change directory to %s: %m", new_root);
-
-        if (old_root_remove) {
-                old_root_fd = open("/", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_NOCTTY|O_DIRECTORY);
-                if (old_root_fd < 0)
-                        log_warning_errno(errno, "Failed to open root directory: %m");
-        }
-
-        /* We first try a pivot_root() so that we can umount the old
-         * root dir. In many cases (i.e. where rootfs is /), that's
-         * not possible however, and hence we simply overmount root */
-        if (pivot_root(new_root, temporary_old_root) >= 0) {
-
-                /* Immediately get rid of the old root, if detach_oldroot is set.
-                 * Since we are running off it we need to do this lazily. */
-                if (detach_oldroot && umount2(oldroot, MNT_DETACH) < 0)
-                        log_error_errno(errno, "Failed to lazily umount old root dir %s, %s: %m",
-                                  oldroot,
-                                  errno == ENOENT ? "ignoring" : "leaving it around");
-
-        } else if (mount(new_root, "/", NULL, MS_MOVE, NULL) < 0)
-                return log_error_errno(errno, "Failed to mount moving %s to /: %m", new_root);
-
-        if (chroot(".") < 0)
-                return log_error_errno(errno, "Failed to change root: %m");
-
-        if (chdir("/") < 0)
-                return log_error_errno(errno, "Failed to change directory: %m");
-
-        if (old_root_fd >= 0) {
-                struct stat rb;
-
-                if (fstat(old_root_fd, &rb) < 0)
-                        log_warning_errno(errno, "Failed to stat old root directory, leaving: %m");
-                else {
-                        (void) rm_rf_children(old_root_fd, 0, &rb);
-                        old_root_fd = -1;
-                }
-        }
-
-        return 0;
-}