Line data    Source code

       1             : /* SPDX-License-Identifier: LGPL-2.1+ */
       2             : 
       3             : #include <errno.h>
       4             : #include <unistd.h>
       5             : 
       6             : #include "alloc-util.h"
       7             : #include "fileio.h"
       8             : #include "log.h"
       9             : #include "raw-reboot.h"
      10             : #include "reboot-util.h"
      11             : #include "string-util.h"
      12             : #include "umask-util.h"
      13             : #include "virt.h"
      14             : 
      15           0 : int update_reboot_parameter_and_warn(const char *parameter, bool keep) {
      16             :         int r;
      17             : 
      18           0 :         if (isempty(parameter)) {
      19           0 :                 if (keep)
      20           0 :                         return 0;
      21             : 
      22           0 :                 if (unlink("/run/systemd/reboot-param") < 0) {
      23           0 :                         if (errno == ENOENT)
      24           0 :                                 return 0;
      25             : 
      26           0 :                         return log_warning_errno(errno, "Failed to unlink reboot parameter file: %m");
      27             :                 }
      28             : 
      29           0 :                 return 0;
      30             :         }
      31             : 
      32           0 :         RUN_WITH_UMASK(0022) {
      33           0 :                 r = write_string_file("/run/systemd/reboot-param", parameter,
      34             :                                       WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
      35           0 :                 if (r < 0)
      36           0 :                         return log_warning_errno(r, "Failed to write reboot parameter file: %m");
      37             :         }
      38             : 
      39           0 :         return 0;
      40             : }
      41             : 
      42           0 : int read_reboot_parameter(char **parameter) {
      43             :         int r;
      44             : 
      45           0 :         assert(parameter);
      46             : 
      47           0 :         r = read_one_line_file("/run/systemd/reboot-param", parameter);
      48           0 :         if (r < 0 && r != -ENOENT)
      49           0 :                 return log_debug_errno(r, "Failed to read /run/systemd/reboot-param: %m");
      50             : 
      51           0 :         return 0;
      52             : }
      53             : 
      54           0 : int reboot_with_parameter(RebootFlags flags) {
      55             :         int r;
      56             : 
      57             :         /* Reboots the system with a parameter that is read from /run/systemd/reboot-param. Returns 0 if REBOOT_DRY_RUN
      58             :          * was set and the actual reboot operation was hence skipped. If REBOOT_FALLBACK is set and the reboot with
      59             :          * parameter doesn't work out a fallback to classic reboot() is attempted. If REBOOT_FALLBACK is not set, 0 is
      60             :          * returned instead, which should be considered indication for the caller to fall back to reboot() on its own,
      61             :          * or somehow else deal with this. If REBOOT_LOG is specified will log about what it is going to do, as well as
      62             :          * all errors. */
      63             : 
      64           0 :         if (detect_container() == 0) {
      65           0 :                 _cleanup_free_ char *parameter = NULL;
      66             : 
      67           0 :                 r = read_one_line_file("/run/systemd/reboot-param", &parameter);
      68           0 :                 if (r < 0 && r != -ENOENT)
      69           0 :                         log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, r,
      70             :                                        "Failed to read reboot parameter file, ignoring: %m");
      71             : 
      72           0 :                 if (!isempty(parameter)) {
      73             : 
      74           0 :                         log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG,
      75             :                                  "Rebooting with argument '%s'.", parameter);
      76             : 
      77           0 :                         if (flags & REBOOT_DRY_RUN)
      78           0 :                                 return 0;
      79             : 
      80           0 :                         (void) raw_reboot(LINUX_REBOOT_CMD_RESTART2, parameter);
      81             : 
      82           0 :                         log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, errno,
      83             :                                        "Failed to reboot with parameter, retrying without: %m");
      84             :                 }
      85             :         }
      86             : 
      87           0 :         if (!(flags & REBOOT_FALLBACK))
      88           0 :                 return 0;
      89             : 
      90           0 :         log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG, "Rebooting.");
      91             : 
      92           0 :         if (flags & REBOOT_DRY_RUN)
      93           0 :                 return 0;
      94             : 
      95           0 :         (void) reboot(RB_AUTOBOOT);
      96             : 
      97           0 :         return log_full_errno(flags & REBOOT_LOG ? LOG_ERR : LOG_DEBUG, errno, "Failed to reboot: %m");
      98             : }