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Support multiple CDROMS in metadata

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This checks if any CDROM in the system has metadata. Useful if
you boot off CDROM and also have a metadata CDROM.

Also switch the metadata container to read only, as it is only
writing to bind mounted in directories, and /tmp.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>
This commit is contained in:
Justin Cormack
2017-08-03 14:16:02 +01:00
parent b886cd0da5
commit 4434ecc4af
3 changed files with 51 additions and 38 deletions
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28
pkg/metadata/main.go
View File

@@ -14,17 +14,11 @@ const (
// ConfigPath is where the data is extracted to
ConfigPath = "/var/config"
// MountPoint is where the CDROM is mounted
MountPoint = "/cdrom"
// Hostname is the filename in configPath where the hostname is stored
Hostname = "hostname"
// SSH is the path where sshd configuration from the provider is stored
SSH = "ssh"
// TODO(rneugeba): Need to check this is the same everywhere
cdromDev = "/dev/sr0"
)
// Provider is a generic interface for metadata/userdata providers.
@@ -48,7 +42,7 @@ var cdromProviders []Provider
func init() {
netProviders = []Provider{NewGCP(), NewVultr(), NewAWS()}
cdromProviders = []Provider{NewCDROM()}
cdromProviders = ListCDROMs()
}
func main() {
@@ -69,19 +63,8 @@ func main() {
}
}
if !found {
log.Printf("Trying CDROM")
if err := os.MkdirAll(MountPoint, 0755); err != nil {
log.Printf("CDROM: Failed to create %s: %s", MountPoint, err)
goto ErrorOut
}
if err := mountCDROM(cdromDev, MountPoint); err != nil {
log.Printf("Failed to mount cdrom: %s", err)
goto ErrorOut
}
defer syscall.Unmount(MountPoint, 0)
// Don't worry about removing MountPoint. We are in a container
for _, p = range cdromProviders {
log.Printf("Trying %s", p.String())
if p.Probe() {
log.Printf("%s: Probe succeeded", p)
userdata, err = p.Extract()
@@ -91,7 +74,6 @@ func main() {
}
}
ErrorOut:
if !found {
log.Printf("No metadata/userdata found. Bye")
return
@@ -202,9 +184,3 @@ func processUserData(data []byte) error {
return nil
}
// mountCDROM mounts a CDROM/DVD device under mountPoint
func mountCDROM(device, mountPoint string) error {
// We may need to poll a little for device ready
return syscall.Mount(device, mountPoint, "iso9660", syscall.MS_RDONLY, "")
}