71b21cf347
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> Upstream-commit: b3e527dfd242ad30c0297c8b257862116cf2c50e Component: engine
92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
package mount
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import (
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"fmt"
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"strings"
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)
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// Parse fstab type mount options into mount() flags
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// and device specific data
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func parseOptions(options string) (int, string) {
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var (
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flag int
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data []string
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)
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flags := map[string]struct {
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clear bool
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flag int
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}{
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"defaults": {false, 0},
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"ro": {false, RDONLY},
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"rw": {true, RDONLY},
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"suid": {true, NOSUID},
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"nosuid": {false, NOSUID},
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"dev": {true, NODEV},
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"nodev": {false, NODEV},
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"exec": {true, NOEXEC},
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"noexec": {false, NOEXEC},
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"sync": {false, SYNCHRONOUS},
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"async": {true, SYNCHRONOUS},
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"dirsync": {false, DIRSYNC},
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"remount": {false, REMOUNT},
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"mand": {false, MANDLOCK},
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"nomand": {true, MANDLOCK},
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"atime": {true, NOATIME},
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"noatime": {false, NOATIME},
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"diratime": {true, NODIRATIME},
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"nodiratime": {false, NODIRATIME},
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"bind": {false, BIND},
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"rbind": {false, RBIND},
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"unbindable": {false, UNBINDABLE},
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"runbindable": {false, RUNBINDABLE},
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"private": {false, PRIVATE},
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"rprivate": {false, RPRIVATE},
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"shared": {false, SHARED},
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"rshared": {false, RSHARED},
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"slave": {false, SLAVE},
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"rslave": {false, RSLAVE},
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"relatime": {false, RELATIME},
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"norelatime": {true, RELATIME},
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"strictatime": {false, STRICTATIME},
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"nostrictatime": {true, STRICTATIME},
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}
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for _, o := range strings.Split(options, ",") {
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// If the option does not exist in the flags table or the flag
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// is not supported on the platform,
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// then it is a data value for a specific fs type
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if f, exists := flags[o]; exists && f.flag != 0 {
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if f.clear {
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flag &= ^f.flag
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} else {
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flag |= f.flag
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}
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} else {
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data = append(data, o)
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}
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}
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return flag, strings.Join(data, ",")
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}
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// ParseTmpfsOptions parse fstab type mount options into flags and data
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func ParseTmpfsOptions(options string) (int, string, error) {
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flags, data := parseOptions(options)
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validFlags := map[string]bool{
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"size": true,
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"mode": true,
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"uid": true,
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"gid": true,
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"nr_inodes": true,
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"nr_blocks": true,
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"mpol": true,
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}
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for _, o := range strings.Split(data, ",") {
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opt := strings.SplitN(o, "=", 2)
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if !validFlags[opt[0]] {
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return 0, "", fmt.Errorf("Invalid tmpfs option %q", opt)
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}
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}
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return flags, data, nil
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}
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