bd052b6116
It will Tar up contents of child directory onto tmpfs if mounted over This patch will use the new PreMount and PostMount hooks to "tar" up the contents of the base image on top of tmpfs mount points. Signed-off-by: Dan Walsh <dwalsh@redhat.com>
91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
package mount
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// Parse fstab type mount options into mount() flags
|
|
// and device specific data
|
|
func parseOptions(options string) (int, string) {
|
|
var (
|
|
flag int
|
|
data []string
|
|
)
|
|
|
|
flags := map[string]struct {
|
|
clear bool
|
|
flag int
|
|
}{
|
|
"defaults": {false, 0},
|
|
"ro": {false, RDONLY},
|
|
"rw": {true, RDONLY},
|
|
"suid": {true, NOSUID},
|
|
"nosuid": {false, NOSUID},
|
|
"dev": {true, NODEV},
|
|
"nodev": {false, NODEV},
|
|
"exec": {true, NOEXEC},
|
|
"noexec": {false, NOEXEC},
|
|
"sync": {false, SYNCHRONOUS},
|
|
"async": {true, SYNCHRONOUS},
|
|
"dirsync": {false, DIRSYNC},
|
|
"remount": {false, REMOUNT},
|
|
"mand": {false, MANDLOCK},
|
|
"nomand": {true, MANDLOCK},
|
|
"atime": {true, NOATIME},
|
|
"noatime": {false, NOATIME},
|
|
"diratime": {true, NODIRATIME},
|
|
"nodiratime": {false, NODIRATIME},
|
|
"bind": {false, BIND},
|
|
"rbind": {false, RBIND},
|
|
"unbindable": {false, UNBINDABLE},
|
|
"runbindable": {false, RUNBINDABLE},
|
|
"private": {false, PRIVATE},
|
|
"rprivate": {false, RPRIVATE},
|
|
"shared": {false, SHARED},
|
|
"rshared": {false, RSHARED},
|
|
"slave": {false, SLAVE},
|
|
"rslave": {false, RSLAVE},
|
|
"relatime": {false, RELATIME},
|
|
"norelatime": {true, RELATIME},
|
|
"strictatime": {false, STRICTATIME},
|
|
"nostrictatime": {true, STRICTATIME},
|
|
}
|
|
|
|
for _, o := range strings.Split(options, ",") {
|
|
// If the option does not exist in the flags table or the flag
|
|
// is not supported on the platform,
|
|
// then it is a data value for a specific fs type
|
|
if f, exists := flags[o]; exists && f.flag != 0 {
|
|
if f.clear {
|
|
flag &= ^f.flag
|
|
} else {
|
|
flag |= f.flag
|
|
}
|
|
} else {
|
|
data = append(data, o)
|
|
}
|
|
}
|
|
return flag, strings.Join(data, ",")
|
|
}
|
|
|
|
// ParseTmpfsOptions parse fstab type mount options into flags and data
|
|
func ParseTmpfsOptions(options string) (int, string, error) {
|
|
flags, data := parseOptions(options)
|
|
validFlags := map[string]bool{
|
|
"size": true,
|
|
"mode": true,
|
|
"uid": true,
|
|
"gid": true,
|
|
"nr_inodes": true,
|
|
"nr_blocks": true,
|
|
"mpol": true,
|
|
}
|
|
for _, o := range strings.Split(data, ",") {
|
|
opt := strings.SplitN(o, "=", 2)
|
|
if !validFlags[opt[0]] {
|
|
return 0, "", fmt.Errorf("Invalid tmpfs option %q", opt)
|
|
}
|
|
}
|
|
return flags, data, nil
|
|
}
|