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Diffstat (limited to '')
-rw-r--r-- | src/shared/reboot-util.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/shared/reboot-util.c b/src/shared/reboot-util.c new file mode 100644 index 0000000..ca40159 --- /dev/null +++ b/src/shared/reboot-util.c @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <errno.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "fileio.h" +#include "log.h" +#include "raw-reboot.h" +#include "reboot-util.h" +#include "string-util.h" +#include "umask-util.h" +#include "virt.h" + +int update_reboot_parameter_and_warn(const char *parameter) { + int r; + + if (isempty(parameter)) { + if (unlink("/run/systemd/reboot-param") < 0) { + if (errno == ENOENT) + return 0; + + return log_warning_errno(errno, "Failed to unlink reboot parameter file: %m"); + } + + return 0; + } + + RUN_WITH_UMASK(0022) { + r = write_string_file("/run/systemd/reboot-param", parameter, + WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC); + if (r < 0) + return log_warning_errno(r, "Failed to write reboot parameter file: %m"); + } + + return 0; +} + +int reboot_with_parameter(RebootFlags flags) { + int r; + + /* Reboots the system with a parameter that is read from /run/systemd/reboot-param. Returns 0 if REBOOT_DRY_RUN + * was set and the actual reboot operation was hence skipped. If REBOOT_FALLBACK is set and the reboot with + * parameter doesn't work out a fallback to classic reboot() is attempted. If REBOOT_FALLBACK is not set, 0 is + * returned instead, which should be considered indication for the caller to fall back to reboot() on its own, + * or somehow else deal with this. If REBOOT_LOG is specified will log about what it is going to do, as well as + * all errors. */ + + if (detect_container() == 0) { + _cleanup_free_ char *parameter = NULL; + + r = read_one_line_file("/run/systemd/reboot-param", ¶meter); + if (r < 0 && r != -ENOENT) + log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, r, + "Failed to read reboot parameter file, ignoring: %m"); + + if (!isempty(parameter)) { + + log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG, + "Rebooting with argument '%s'.", parameter); + + if (flags & REBOOT_DRY_RUN) + return 0; + + (void) raw_reboot(LINUX_REBOOT_CMD_RESTART2, parameter); + + log_full_errno(flags & REBOOT_LOG ? LOG_WARNING : LOG_DEBUG, errno, + "Failed to reboot with parameter, retrying without: %m"); + } + } + + if (!(flags & REBOOT_FALLBACK)) + return 0; + + log_full(flags & REBOOT_LOG ? LOG_INFO : LOG_DEBUG, "Rebooting."); + + if (flags & REBOOT_DRY_RUN) + return 0; + + (void) reboot(RB_AUTOBOOT); + + return log_full_errno(flags & REBOOT_LOG ? LOG_ERR : LOG_DEBUG, errno, "Failed to reboot: %m"); +} |