115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
package containerd
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import (
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"os"
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"os/exec"
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"strings"
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"syscall"
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)
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// Mount is the lingua franca of containerd. A mount represents a
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// serialized mount syscall. Components either emit or consume mounts.
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type Mount struct {
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// Type specifies the host-specific of the mount.
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Type string
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// Source specifies where to mount from. Depending on the host system, this
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// can be a source path or device.
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Source string
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// Target is the filesystem mount location.
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Target string
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// Options contains zero or more fstab-style mount options. Typically,
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// these are platform specific.
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Options []string
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}
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// MountCommand converts the provided mount into a CLI arguments that can be used to mount the
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func MountCommand(m Mount) []string {
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return []string{
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"mount",
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"-t", strings.ToLower(m.Type),
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m.Source,
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m.Target,
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"-o", strings.Join(m.Options, ","),
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}
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}
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func MountAll(mounts ...Mount) error {
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for _, mount := range mounts {
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cmd := exec.Command("mount", MountCommand(mount)[1:]...)
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cmd.Stderr = os.Stderr
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cmd.Stdout = os.Stdout
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if err := cmd.Run(); err != nil {
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return err
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}
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}
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return nil
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}
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func MountFS(mounts []Mount, target string) error {
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for _, m := range mounts {
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flags, data := parseMountOptions(m.Options)
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if err := syscall.Mount(m.Source, target, m.Type, uintptr(flags), data); err != nil {
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return err
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}
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}
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return nil
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}
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// parseMountOptions takes fstab style mount options and parses them for
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// use with a standard mount() syscall
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func parseMountOptions(options []string) (int, string) {
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var (
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flag int
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data []string
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)
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flags := map[string]struct {
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clear bool
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flag int
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}{
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"async": {true, syscall.MS_SYNCHRONOUS},
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"atime": {true, syscall.MS_NOATIME},
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"bind": {false, syscall.MS_BIND},
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"defaults": {false, 0},
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"dev": {true, syscall.MS_NODEV},
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"diratime": {true, syscall.MS_NODIRATIME},
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"dirsync": {false, syscall.MS_DIRSYNC},
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"exec": {true, syscall.MS_NOEXEC},
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"mand": {false, syscall.MS_MANDLOCK},
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"noatime": {false, syscall.MS_NOATIME},
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"nodev": {false, syscall.MS_NODEV},
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"nodiratime": {false, syscall.MS_NODIRATIME},
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"noexec": {false, syscall.MS_NOEXEC},
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"nomand": {true, syscall.MS_MANDLOCK},
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"norelatime": {true, syscall.MS_RELATIME},
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"nostrictatime": {true, syscall.MS_STRICTATIME},
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"nosuid": {false, syscall.MS_NOSUID},
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"rbind": {false, syscall.MS_BIND | syscall.MS_REC},
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"relatime": {false, syscall.MS_RELATIME},
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"remount": {false, syscall.MS_REMOUNT},
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"ro": {false, syscall.MS_RDONLY},
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"rw": {true, syscall.MS_RDONLY},
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"strictatime": {false, syscall.MS_STRICTATIME},
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"suid": {true, syscall.MS_NOSUID},
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"sync": {false, syscall.MS_SYNCHRONOUS},
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}
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for _, o := range options {
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// If the option does not exist in the flags table or the flag
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// is not supported on the platform,
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// then it is a data value for a specific fs type
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if f, exists := flags[o]; exists && f.flag != 0 {
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if f.clear {
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flag &= ^f.flag
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} else {
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flag |= f.flag
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}
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} else {
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data = append(data, o)
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}
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}
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return flag, strings.Join(data, ",")
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}
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