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https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
c561212b83
Use mountinfo rather than for cgroups parsing. Make helper method private and change name. Makes method naming more explicit rather than GetThisCgroup. Use upstream term subsystem rather than cgroupType.
79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
package mount
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strings"
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)
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const (
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/* 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
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(1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
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(1) mount ID: unique identifier of the mount (may be reused after umount)
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(2) parent ID: ID of parent (or of self for the top of the mount tree)
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(3) major:minor: value of st_dev for files on filesystem
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(4) root: root of the mount within the filesystem
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(5) mount point: mount point relative to the process's root
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(6) mount options: per mount options
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(7) optional fields: zero or more fields of the form "tag[:value]"
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(8) separator: marks the end of the optional fields
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(9) filesystem type: name of filesystem of the form "type[.subtype]"
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(10) mount source: filesystem specific information or "none"
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(11) super options: per super block options*/
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mountinfoFormat = "%d %d %d:%d %s %s %s "
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)
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type MountInfo struct {
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Id, Parent, Major, Minor int
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Root, Mountpoint, Opts string
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Fstype, Source, VfsOpts string
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}
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// Parse /proc/self/mountinfo because comparing Dev and ino does not work from bind mounts
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func parseMountTable() ([]*MountInfo, error) {
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f, err := os.Open("/proc/self/mountinfo")
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return parseInfoFile(f)
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}
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func parseInfoFile(r io.Reader) ([]*MountInfo, error) {
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var (
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s = bufio.NewScanner(r)
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out = []*MountInfo{}
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)
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for s.Scan() {
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if err := s.Err(); err != nil {
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return nil, err
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}
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var (
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p = &MountInfo{}
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text = s.Text()
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)
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if _, err := fmt.Sscanf(text, mountinfoFormat,
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&p.Id, &p.Parent, &p.Major, &p.Minor,
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&p.Root, &p.Mountpoint, &p.Opts); err != nil {
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return nil, fmt.Errorf("Scanning '%s' failed: %s", text, err)
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}
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// Safe as mountinfo encodes mountpoints with spaces as \040.
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index := strings.Index(text, " - ")
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postSeparatorFields := strings.Fields(text[index+3:])
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if len(postSeparatorFields) != 3 {
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return nil, fmt.Errorf("Error did not find 3 fields post '-' in '%s'", text)
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}
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p.Fstype = postSeparatorFields[0]
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p.Source = postSeparatorFields[1]
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p.VfsOpts = postSeparatorFields[2]
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out = append(out, p)
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}
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return out, nil
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}
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