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update: extract function to other applicable exp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| package util | ||
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| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
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||
| const mountInfoPath string = "/proc/self/mountinfo" | ||
| const hostDeviceFlag string = "/etc/hosts" | ||
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| type MountInfo struct { | ||
| Device string | ||
| Fstype string | ||
| Root string | ||
| MountPoint string | ||
| Opts []string | ||
| Marjor string | ||
| Minor string | ||
| } | ||
|
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| // find block device id | ||
| func FindTargetDeviceID(mi *MountInfo) bool { | ||
| if mi.MountPoint == hostDeviceFlag { | ||
| log.Printf("found host blockDeviceId Marjor: %s Minor: %s\n", mi.Marjor, mi.Minor) | ||
| return true | ||
| } | ||
| return false | ||
| } | ||
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| func GetMountInfo() ([]MountInfo, error) { | ||
| f, err := os.Open(mountInfoPath) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer f.Close() | ||
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| var ret []string | ||
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| r := bufio.NewReader(f) | ||
| for { | ||
| line, err := r.ReadString('\n') | ||
| if err != nil { | ||
| break | ||
| } | ||
| ret = append(ret, strings.Trim(line, "\n")) | ||
| } | ||
| // 2346 2345 0:261 / /proc rw,nosuid,nodev,noexec,relatime - proc proc rw | ||
| mountInfos := make([]MountInfo, len(ret)) | ||
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| for _, r := range ret { | ||
| parts := strings.Split(r, " - ") | ||
| if len(parts) != 2 { | ||
| return nil, fmt.Errorf("found invalid mountinfo line in file %s: %s ", mountInfoPath, r) | ||
| } | ||
| mi := MountInfo{} | ||
| fields := strings.Fields(parts[0]) | ||
| mi.Root = fields[3] | ||
| mi.MountPoint = fields[4] | ||
| mi.Opts = strings.Split(fields[5], ",") | ||
| blockId := strings.Split(fields[2], ":") | ||
| if len(blockId) != 2 { | ||
| return nil, fmt.Errorf("found invalid mountinfo line in file %s: %s ", mountInfoPath, r) | ||
| } | ||
| mi.Marjor = blockId[0] | ||
| mi.Minor = blockId[1] | ||
| fields = strings.Fields(parts[1]) | ||
| mi.Device = fields[1] | ||
| mi.Fstype = fields[0] | ||
| mountInfos = append(mountInfos, mi) | ||
| } | ||
|
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| return mountInfos, err | ||
| } | ||
|
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| func MakeDev(major, minor string) int { | ||
| ret1, err := strconv.ParseInt(major, 10, 64) | ||
| if err != nil { | ||
| log.Printf("convert major number to int64 err: %v\n", err) | ||
| return 0 | ||
| } | ||
| ret2, err := strconv.ParseInt(minor, 10, 64) | ||
| if err != nil { | ||
| log.Printf("convert minor number to int64 err: %v\n", err) | ||
| return 0 | ||
| } | ||
|
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| return int(((ret1 & 0xfff) << 8) | (ret2 & 0xff) | ((ret1 &^ 0xfff) << 32) | ((ret2 & 0xfffff00) << 12)) | ||
| } | ||
|
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||
| // set all block device accessible | ||
| func SetBlockAccessible(path string) error { | ||
| f, err := os.OpenFile(path, os.O_WRONLY|os.O_SYNC, 0200) | ||
| if err != nil { | ||
| return fmt.Errorf("open devices.allow failed. %v\n", err) | ||
| } | ||
| defer f.Close() | ||
|
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| l, err := f.Write([]byte("a")) | ||
| if err != nil { | ||
| return fmt.Errorf("write devices.allow failed. %v\n", err) | ||
| } | ||
|
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| if l != 1 { | ||
| return fmt.Errorf("write \"a\" to devices.allow failed.\n") | ||
| } | ||
| log.Printf("set all block device accessible success.\n") | ||
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| return nil | ||
| } | ||
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