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package fstestutil
import (
"errors"
"io/ioutil"
"strings"
"time"
)
// Linux /proc/mounts shows current mounts.
// Same format as /etc/fstab. Quoting getmntent(3):
//
// Since fields in the mtab and fstab files are separated by whitespace,
// octal escapes are used to represent the four characters space (\040),
// tab (\011), newline (\012) and backslash (\134) in those files when
// they occur in one of the four strings in a mntent structure.
//
// http://linux.die.net/man/3/getmntent
var fstabUnescape = strings.NewReplacer(
`\040`, "\040",
`\011`, "\011",
`\012`, "\012",
`\134`, "\134",
)
var errNotFound = errors.New("mount not found")
func getMountInfo(mnt string) (*MountInfo, error) {
// TODO delay a little to minimize an undiagnosed race between
// fuse.Conn.Ready and /proc/mounts
// https://github.com/bazil/fuse/issues/228
time.Sleep(10 * time.Millisecond)
data, err := ioutil.ReadFile("/proc/mounts")
if err != nil {
return nil, err
}
for _, line := range strings.Split(string(data), "\n") {
fields := strings.Fields(line)
if len(fields) < 3 {
continue
}
// Fields are: fsname dir type opts freq passno
fsname := fstabUnescape.Replace(fields[0])
dir := fstabUnescape.Replace(fields[1])
fstype := fstabUnescape.Replace(fields[2])
if mnt == dir {
info := &MountInfo{
FSName: fsname,
Type: fstype,
}
return info, nil
}
}
return nil, errNotFound
}
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