mirror of
https://github.com/genuinetools/reg.git
synced 2024-08-20 22:00:23 -04:00
94 lines
2.6 KiB
Go
94 lines
2.6 KiB
Go
package mount // import "github.com/docker/docker/pkg/mount"
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
/* 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
|
|
(1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
|
|
|
|
(1) mount ID: unique identifier of the mount (may be reused after umount)
|
|
(2) parent ID: ID of parent (or of self for the top of the mount tree)
|
|
(3) major:minor: value of st_dev for files on filesystem
|
|
(4) root: root of the mount within the filesystem
|
|
(5) mount point: mount point relative to the process's root
|
|
(6) mount options: per mount options
|
|
(7) optional fields: zero or more fields of the form "tag[:value]"
|
|
(8) separator: marks the end of the optional fields
|
|
(9) filesystem type: name of filesystem of the form "type[.subtype]"
|
|
(10) mount source: filesystem specific information or "none"
|
|
(11) super options: per super block options*/
|
|
mountinfoFormat = "%d %d %d:%d %s %s %s %s"
|
|
)
|
|
|
|
// Parse /proc/self/mountinfo because comparing Dev and ino does not work from
|
|
// bind mounts
|
|
func parseMountTable() ([]*Info, error) {
|
|
f, err := os.Open("/proc/self/mountinfo")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
return parseInfoFile(f)
|
|
}
|
|
|
|
func parseInfoFile(r io.Reader) ([]*Info, error) {
|
|
var (
|
|
s = bufio.NewScanner(r)
|
|
out = []*Info{}
|
|
)
|
|
|
|
for s.Scan() {
|
|
if err := s.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var (
|
|
p = &Info{}
|
|
text = s.Text()
|
|
optionalFields string
|
|
)
|
|
|
|
if _, err := fmt.Sscanf(text, mountinfoFormat,
|
|
&p.ID, &p.Parent, &p.Major, &p.Minor,
|
|
&p.Root, &p.Mountpoint, &p.Opts, &optionalFields); err != nil {
|
|
return nil, fmt.Errorf("Scanning '%s' failed: %s", text, err)
|
|
}
|
|
// Safe as mountinfo encodes mountpoints with spaces as \040.
|
|
index := strings.Index(text, " - ")
|
|
postSeparatorFields := strings.Fields(text[index+3:])
|
|
if len(postSeparatorFields) < 3 {
|
|
return nil, fmt.Errorf("Error found less than 3 fields post '-' in %q", text)
|
|
}
|
|
|
|
if optionalFields != "-" {
|
|
p.Optional = optionalFields
|
|
}
|
|
|
|
p.Fstype = postSeparatorFields[0]
|
|
p.Source = postSeparatorFields[1]
|
|
p.VfsOpts = strings.Join(postSeparatorFields[2:], " ")
|
|
out = append(out, p)
|
|
}
|
|
return out, nil
|
|
}
|
|
|
|
// PidMountInfo collects the mounts for a specific process ID. If the process
|
|
// ID is unknown, it is better to use `GetMounts` which will inspect
|
|
// "/proc/self/mountinfo" instead.
|
|
func PidMountInfo(pid int) ([]*Info, error) {
|
|
f, err := os.Open(fmt.Sprintf("/proc/%d/mountinfo", pid))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer f.Close()
|
|
|
|
return parseInfoFile(f)
|
|
}
|