0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
141 lines
4.4 KiB
C
141 lines
4.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <sys/mount.h>
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#include "alloc-util.h"
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#include "fs-util.h"
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#include "mkdir.h"
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#include "mount-util.h"
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#include "stat-util.h"
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#include "volatile-util.h"
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#include "string-util.h"
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#include "path-util.h"
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static int make_volatile(const char *path) {
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_cleanup_free_ char *old_usr = NULL;
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int r;
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r = path_is_mount_point(path, NULL, AT_SYMLINK_FOLLOW);
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if (r < 0)
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return log_error_errno(r, "Couldn't determine whether %s is a mount point: %m", path);
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if (r == 0) {
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log_error("%s is not a mount point.", path);
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return -EINVAL;
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}
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r = path_is_temporary_fs(path);
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if (r < 0)
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return log_error_errno(r, "Couldn't determine whether %s is a temporary file system: %m", path);
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if (r > 0) {
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log_info("%s already is a temporary file system.", path);
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return 0;
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}
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r = chase_symlinks("/usr", path, CHASE_PREFIX_ROOT, &old_usr);
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if (r < 0)
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return log_error_errno(r, "/usr not available in old root: %m");
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r = mkdir_p("/run/systemd/volatile-sysroot", 0700);
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if (r < 0)
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return log_error_errno(r, "Couldn't generate volatile sysroot directory: %m");
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r = mount_verbose(LOG_ERR, "tmpfs", "/run/systemd/volatile-sysroot", "tmpfs", MS_STRICTATIME, "mode=755");
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if (r < 0)
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goto finish_rmdir;
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if (mkdir("/run/systemd/volatile-sysroot/usr", 0755) < 0) {
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r = -errno;
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goto finish_umount;
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}
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r = mount_verbose(LOG_ERR, old_usr, "/run/systemd/volatile-sysroot/usr", NULL, MS_BIND|MS_REC, NULL);
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if (r < 0)
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goto finish_umount;
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r = bind_remount_recursive("/run/systemd/volatile-sysroot/usr", true, NULL);
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if (r < 0)
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goto finish_umount;
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r = umount_recursive(path, 0);
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if (r < 0) {
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log_error_errno(r, "Failed to unmount %s: %m", path);
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goto finish_umount;
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}
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if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
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log_warning_errno(errno, "Failed to remount %s MS_SLAVE|MS_REC: %m", path);
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r = mount_verbose(LOG_ERR, "/run/systemd/volatile-sysroot", path, NULL, MS_MOVE, NULL);
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finish_umount:
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(void) umount_recursive("/run/systemd/volatile-sysroot", 0);
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finish_rmdir:
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(void) rmdir("/run/systemd/volatile-sysroot");
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return r;
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}
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int main(int argc, char *argv[]) {
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VolatileMode m = _VOLATILE_MODE_INVALID;
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const char *path;
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int r;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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if (argc > 3) {
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log_error("Too many arguments. Expected directory and mode.");
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r = -EINVAL;
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goto finish;
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}
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r = query_volatile_mode(&m);
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if (r < 0) {
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log_error_errno(r, "Failed to determine volatile mode from kernel command line.");
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goto finish;
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}
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if (r == 0 && argc >= 2) {
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/* The kernel command line always wins. However if nothing was set there, the argument passed here wins instead. */
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m = volatile_mode_from_string(argv[1]);
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if (m < 0) {
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log_error("Couldn't parse volatile mode: %s", argv[1]);
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r = -EINVAL;
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goto finish;
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}
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}
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if (argc < 3)
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path = "/sysroot";
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else {
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path = argv[2];
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if (isempty(path)) {
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log_error("Directory name cannot be empty.");
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r = -EINVAL;
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goto finish;
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}
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if (!path_is_absolute(path)) {
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log_error("Directory must be specified as absolute path.");
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r = -EINVAL;
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goto finish;
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}
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if (path_equal(path, "/")) {
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log_error("Directory cannot be the root directory.");
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r = -EINVAL;
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goto finish;
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}
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}
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if (m != VOLATILE_YES) {
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r = 0;
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goto finish;
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}
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r = make_volatile(path);
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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