func (e idsFromEtc) IDs() (uid int, gid int, err error) {
uid, gid = -1, -1
uid, err = passwd.LookupUidFromFile(
e.username,
filepath.Join(e.rootPath, "etc/passwd"),
)
if e.username != "" && err != nil {
return
}
gid, err = group.LookupGidFromFile(
e.group,
filepath.Join(e.rootPath, "etc/group"),
)
if e.group != "" && err != nil {
return
}
return uid, gid, nil
}
// appToSystemd transforms the provided RuntimeApp+ImageManifest into systemd units
func appToSystemd(p *stage1commontypes.Pod, ra *schema.RuntimeApp, interactive bool, flavor string, privateUsers string) error {
app := ra.App
appName := ra.Name
imgName := p.AppNameToImageName(appName)
if len(app.Exec) == 0 {
return fmt.Errorf(`image %q has an empty "exec" (try --exec=BINARY)`, imgName)
}
workDir := "/"
if app.WorkingDirectory != "" {
workDir = app.WorkingDirectory
}
env := app.Environment
env.Set("AC_APP_NAME", appName.String())
if p.MetadataServiceURL != "" {
env.Set("AC_METADATA_URL", p.MetadataServiceURL)
}
if err := writeEnvFile(p, env, appName, privateUsers); err != nil {
return errwrap.Wrap(errors.New("unable to write environment file"), err)
}
var _uid, gid int
var err error
uidRange := uid.NewBlankUidRange()
if err := uidRange.Deserialize([]byte(privateUsers)); err != nil {
return errwrap.Wrap(errors.New("unable to deserialize uid range"), err)
}
if strings.HasPrefix(app.User, "/") {
var stat syscall.Stat_t
if err = syscall.Lstat(filepath.Join(common.AppRootfsPath(p.Root, appName),
app.User), &stat); err != nil {
return errwrap.Wrap(fmt.Errorf("unable to get uid from file %q",
app.User), err)
}
uidReal, _, err := uidRange.UnshiftRange(stat.Uid, 0)
if err != nil {
return errwrap.Wrap(errors.New("unable to determine real uid"), err)
}
_uid = int(uidReal)
} else {
_uid, err = strconv.Atoi(app.User)
if err != nil {
_uid, err = passwd.LookupUidFromFile(app.User,
filepath.Join(common.AppRootfsPath(p.Root, appName), "etc/passwd"))
if err != nil {
return errwrap.Wrap(fmt.Errorf("cannot lookup user %q", app.User), err)
}
}
}
if strings.HasPrefix(app.Group, "/") {
var stat syscall.Stat_t
if err = syscall.Lstat(filepath.Join(common.AppRootfsPath(p.Root, appName),
app.Group), &stat); err != nil {
return errwrap.Wrap(fmt.Errorf("unable to get gid from file %q",
app.Group), err)
}
_, gidReal, err := uidRange.UnshiftRange(0, stat.Gid)
if err != nil {
return errwrap.Wrap(errors.New("unable to determine real gid"), err)
}
gid = int(gidReal)
} else {
gid, err = strconv.Atoi(app.Group)
if err != nil {
gid, err = group.LookupGidFromFile(app.Group,
filepath.Join(common.AppRootfsPath(p.Root, appName), "etc/group"))
if err != nil {
return errwrap.Wrap(fmt.Errorf("cannot lookup group %q", app.Group), err)
}
}
}
execWrap := []string{"/appexec", common.RelAppRootfsPath(appName), workDir, RelEnvFilePath(appName),
strconv.Itoa(_uid), generateGidArg(gid, app.SupplementaryGIDs), "--"}
execStart := quoteExec(append(execWrap, app.Exec...))
opts := []*unit.UnitOption{
unit.NewUnitOption("Unit", "Description", fmt.Sprintf("Application=%v Image=%v", appName, imgName)),
unit.NewUnitOption("Unit", "DefaultDependencies", "false"),
unit.NewUnitOption("Unit", "Wants", fmt.Sprintf("reaper-%s.service", appName)),
unit.NewUnitOption("Service", "Restart", "no"),
unit.NewUnitOption("Service", "ExecStart", execStart),
unit.NewUnitOption("Service", "User", "0"),
unit.NewUnitOption("Service", "Group", "0"),
}
if interactive {
opts = append(opts, unit.NewUnitOption("Service", "StandardInput", "tty"))
opts = append(opts, unit.NewUnitOption("Service", "StandardOutput", "tty"))
opts = append(opts, unit.NewUnitOption("Service", "StandardError", "tty"))
} else {
opts = append(opts, unit.NewUnitOption("Service", "StandardOutput", "journal+console"))
opts = append(opts, unit.NewUnitOption("Service", "StandardError", "journal+console"))
opts = append(opts, unit.NewUnitOption("Service", "SyslogIdentifier", filepath.Base(app.Exec[0])))
}
// When an app fails, we shut down the pod
opts = append(opts, unit.NewUnitOption("Unit", "OnFailure", "halt.target"))
for _, eh := range app.EventHandlers {
var typ string
switch eh.Name {
case "pre-start":
typ = "ExecStartPre"
case "post-stop":
typ = "ExecStopPost"
default:
return fmt.Errorf("unrecognized eventHandler: %v", eh.Name)
}
exec := quoteExec(append(execWrap, eh.Exec...))
opts = append(opts, unit.NewUnitOption("Service", typ, exec))
}
// Some pre-start jobs take a long time, set the timeout to 0
opts = append(opts, unit.NewUnitOption("Service", "TimeoutStartSec", "0"))
var saPorts []types.Port
for _, p := range app.Ports {
if p.SocketActivated {
saPorts = append(saPorts, p)
}
}
for _, i := range app.Isolators {
switch v := i.Value().(type) {
case *types.ResourceMemory:
opts, err = cgroup.MaybeAddIsolator(opts, "memory", v.Limit())
if err != nil {
return err
}
case *types.ResourceCPU:
opts, err = cgroup.MaybeAddIsolator(opts, "cpu", v.Limit())
if err != nil {
return err
}
}
}
if len(saPorts) > 0 {
sockopts := []*unit.UnitOption{
unit.NewUnitOption("Unit", "Description", fmt.Sprintf("Application=%v Image=%v %s", appName, imgName, "socket-activated ports")),
unit.NewUnitOption("Unit", "DefaultDependencies", "false"),
unit.NewUnitOption("Socket", "BindIPv6Only", "both"),
unit.NewUnitOption("Socket", "Service", ServiceUnitName(appName)),
}
for _, sap := range saPorts {
var proto string
switch sap.Protocol {
case "tcp":
proto = "ListenStream"
case "udp":
proto = "ListenDatagram"
default:
return fmt.Errorf("unrecognized protocol: %v", sap.Protocol)
}
// We find the host port for the pod's port and use that in the
// socket unit file.
// This is so because systemd inside the pod will match based on
// the socket port number, and since the socket was created on the
// host, it will have the host port number.
port := findHostPort(*p.Manifest, sap.Name)
if port == 0 {
log.Printf("warning: no --port option for socket-activated port %q, assuming port %d as specified in the manifest", sap.Name, sap.Port)
port = sap.Port
}
sockopts = append(sockopts, unit.NewUnitOption("Socket", proto, fmt.Sprintf("%v", port)))
}
file, err := os.OpenFile(SocketUnitPath(p.Root, appName), os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return errwrap.Wrap(errors.New("failed to create socket file"), err)
}
defer file.Close()
if _, err = io.Copy(file, unit.Serialize(sockopts)); err != nil {
return errwrap.Wrap(errors.New("failed to write socket unit file"), err)
}
if err = os.Symlink(path.Join("..", SocketUnitName(appName)), SocketWantPath(p.Root, appName)); err != nil {
return errwrap.Wrap(errors.New("failed to link socket want"), err)
}
opts = append(opts, unit.NewUnitOption("Unit", "Requires", SocketUnitName(appName)))
}
opts = append(opts, unit.NewUnitOption("Unit", "Requires", InstantiatedPrepareAppUnitName(appName)))
opts = append(opts, unit.NewUnitOption("Unit", "After", InstantiatedPrepareAppUnitName(appName)))
file, err := os.OpenFile(ServiceUnitPath(p.Root, appName), os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return errwrap.Wrap(errors.New("failed to create service unit file"), err)
}
defer file.Close()
if _, err = io.Copy(file, unit.Serialize(opts)); err != nil {
return errwrap.Wrap(errors.New("failed to write service unit file"), err)
}
if err = os.Symlink(path.Join("..", ServiceUnitName(appName)), ServiceWantPath(p.Root, appName)); err != nil {
return errwrap.Wrap(errors.New("failed to link service want"), err)
}
if flavor == "kvm" {
// bind mount all shared volumes from /mnt/volumeName (we don't use mechanism for bind-mounting given by nspawn)
err := AppToSystemdMountUnits(common.Stage1RootfsPath(p.Root), appName, p.Manifest.Volumes, ra, UnitsDir)
if err != nil {
return errwrap.Wrap(errors.New("failed to prepare mount units"), err)
}
}
if err = writeAppReaper(p, appName.String()); err != nil {
return errwrap.Wrap(fmt.Errorf("failed to write app %q reaper service", appName), err)
}
return nil
}
// parseUserGroup parses the User and Group fields of an App and returns its
// UID and GID.
// The User and Group fields accept several formats:
// 1. the hardcoded string "root"
// 2. a path
// 3. a number
// 4. a name in reference to /etc/{group,passwod} in the image
// See https://github.com/appc/spec/blob/master/spec/aci.md#image-manifest-schema
func parseUserGroup(p *stage1commontypes.Pod, ra *schema.RuntimeApp, privateUsers string) (int, int, error) {
app := ra.App
appName := ra.Name
var uid_, gid_ int
var err error
uidRange := uid.NewBlankUidRange()
if err := uidRange.Deserialize([]byte(privateUsers)); err != nil {
return -1, -1, errwrap.Wrap(errors.New("unable to deserialize uid range"), err)
}
switch {
case app.User == "root":
uid_ = 0
case strings.HasPrefix(app.User, "/"):
var stat syscall.Stat_t
if err = syscall.Lstat(filepath.Join(common.AppRootfsPath(p.Root, appName),
app.User), &stat); err != nil {
return -1, -1, errwrap.Wrap(fmt.Errorf("unable to get uid from file %q",
app.User), err)
}
uidReal, _, err := uidRange.UnshiftRange(stat.Uid, 0)
if err != nil {
return -1, -1, errwrap.Wrap(errors.New("unable to determine real uid"), err)
}
uid_ = int(uidReal)
default:
uid_, err = strconv.Atoi(app.User)
if err != nil {
uid_, err = passwd.LookupUidFromFile(app.User,
filepath.Join(common.AppRootfsPath(p.Root, appName), "etc/passwd"))
if err != nil {
return -1, -1, errwrap.Wrap(fmt.Errorf("cannot lookup user %q", app.User), err)
}
}
}
switch {
case app.Group == "root":
gid_ = 0
case strings.HasPrefix(app.Group, "/"):
var stat syscall.Stat_t
if err = syscall.Lstat(filepath.Join(common.AppRootfsPath(p.Root, appName),
app.Group), &stat); err != nil {
return -1, -1, errwrap.Wrap(fmt.Errorf("unable to get gid from file %q",
app.Group), err)
}
_, gidReal, err := uidRange.UnshiftRange(0, stat.Gid)
if err != nil {
return -1, -1, errwrap.Wrap(errors.New("unable to determine real gid"), err)
}
gid_ = int(gidReal)
default:
gid_, err = strconv.Atoi(app.Group)
if err != nil {
gid_, err = group.LookupGidFromFile(app.Group,
filepath.Join(common.AppRootfsPath(p.Root, appName), "etc/group"))
if err != nil {
return -1, -1, errwrap.Wrap(fmt.Errorf("cannot lookup group %q", app.Group), err)
}
}
}
return uid_, gid_, nil
}