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Sync systemd boot next boot with current entry.
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| package main | |
| import ( | |
| "fmt" | |
| "io" | |
| "os" | |
| "runtime" | |
| "syscall" | |
| "unsafe" | |
| ) | |
| const ( | |
| GUID = "4a67b082-0a4c-41cf-b6c7-440b29bb8c4f" // Put your systemd-boot GUID here | |
| FS_IOC_SETFLAGS = 0x40086602 | |
| ) | |
| func deleteExisted() error { | |
| fileName := fmt.Sprintf("/sys/firmware/efi/efivars/LoaderEntryOneShot-%s", GUID) | |
| file, err := os.OpenFile(fileName, os.O_RDONLY, 0) | |
| if err != nil { | |
| if os.IsNotExist(err) { | |
| return nil | |
| } | |
| return err | |
| } | |
| defer file.Close() | |
| sysconn, err := file.SyscallConn() | |
| if err != nil { | |
| return err | |
| } | |
| var innerErr error | |
| err = sysconn.Control(func(fd uintptr) { | |
| flags := uint32(0) | |
| _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, FS_IOC_SETFLAGS, uintptr(unsafe.Pointer(&flags))) | |
| if err != 0 { | |
| innerErr = err | |
| } | |
| runtime.KeepAlive(flags) | |
| }) | |
| if err != nil { | |
| return err | |
| } | |
| if innerErr != nil { | |
| return innerErr | |
| } | |
| return os.Remove(fileName) | |
| } | |
| func main() { | |
| err := deleteExisted() | |
| if err != nil { | |
| panic(err.Error()) | |
| } | |
| current, err := os.OpenFile(fmt.Sprintf("/sys/firmware/efi/efivars/LoaderEntrySelected-%s", GUID), os.O_RDONLY, 0) | |
| if err != nil { | |
| panic(err.Error()) | |
| } | |
| defer current.Close() | |
| content, err := io.ReadAll(current) | |
| if err != nil { | |
| panic(err.Error()) | |
| } | |
| content[0] = 0x07 | |
| oneshot, err := os.OpenFile(fmt.Sprintf("/sys/firmware/efi/efivars/LoaderEntryOneShot-%s", GUID), os.O_WRONLY|os.O_CREATE, 0644) | |
| if err != nil { | |
| panic(err.Error()) | |
| } | |
| n, err := oneshot.Write(content) | |
| println(n, "written") | |
| } |
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