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moby--moby/daemon/graphdriver/overlay2/mount.go
Christopher Jones 069fdc8a08
[project] change syscall to /x/sys/unix|windows
Changes most references of syscall to golang.org/x/sys/
Ones aren't changes include, Errno, Signal and SysProcAttr
as they haven't been implemented in /x/sys/.

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>

[s390x] switch utsname from unsigned to signed

per 33267e036f
char in s390x in the /x/sys/unix package is now signed, so
change the buildtags

Signed-off-by: Christopher Jones <tophj@linux.vnet.ibm.com>
2017-07-11 08:00:32 -04:00

88 lines
1.7 KiB
Go

// +build linux
package overlay2
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"os"
"runtime"
"github.com/docker/docker/pkg/reexec"
"golang.org/x/sys/unix"
)
func init() {
reexec.Register("docker-mountfrom", mountFromMain)
}
func fatal(err error) {
fmt.Fprint(os.Stderr, err)
os.Exit(1)
}
type mountOptions struct {
Device string
Target string
Type string
Label string
Flag uint32
}
func mountFrom(dir, device, target, mType string, flags uintptr, label string) error {
options := &mountOptions{
Device: device,
Target: target,
Type: mType,
Flag: uint32(flags),
Label: label,
}
cmd := reexec.Command("docker-mountfrom", dir)
w, err := cmd.StdinPipe()
if err != nil {
return fmt.Errorf("mountfrom error on pipe creation: %v", err)
}
output := bytes.NewBuffer(nil)
cmd.Stdout = output
cmd.Stderr = output
if err := cmd.Start(); err != nil {
return fmt.Errorf("mountfrom error on re-exec cmd: %v", err)
}
//write the options to the pipe for the untar exec to read
if err := json.NewEncoder(w).Encode(options); err != nil {
return fmt.Errorf("mountfrom json encode to pipe failed: %v", err)
}
w.Close()
if err := cmd.Wait(); err != nil {
return fmt.Errorf("mountfrom re-exec error: %v: output: %s", err, output)
}
return nil
}
// mountfromMain is the entry-point for docker-mountfrom on re-exec.
func mountFromMain() {
runtime.LockOSThread()
flag.Parse()
var options *mountOptions
if err := json.NewDecoder(os.Stdin).Decode(&options); err != nil {
fatal(err)
}
if err := os.Chdir(flag.Arg(0)); err != nil {
fatal(err)
}
if err := unix.Mount(options.Device, options.Target, options.Type, uintptr(options.Flag), options.Label); err != nil {
fatal(err)
}
os.Exit(0)
}