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Merge pull request #19093 from estesp/userns-root-rework

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Allow root non-userns metadata backwards compatibility
This commit is contained in:
Tõnis Tiigi 2016-01-06 09:48:37 -08:00
commit fe550a1f17
3 changed files with 22 additions and 40 deletions
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56
daemon/daemon_experimental.go
View file

@ -10,7 +10,6 @@ import (
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/pkg/directory"
"github.com/docker/docker/pkg/idtools"
)
@ -48,53 +47,36 @@ func setupRemappedRoot(config *Config) ([]idtools.IDMap, []idtools.IDMap, error)
}
func setupDaemonRoot(config *Config, rootDir string, rootUID, rootGID int) error {
// the main docker root needs to be accessible by all users, as user namespace support
// will create subdirectories owned by either a) the real system root (when no remapping
// is setup) or b) the remapped root host ID (when --root=uid:gid is used)
// for "first time" users of user namespaces, we need to migrate the current directory
// contents to the "0.0" (root == root "namespace" daemon root)
nsRoot := "0.0"
config.Root = rootDir
// the docker root metadata directory needs to have execute permissions for all users (o+x)
// so that syscalls executing as non-root, operating on subdirectories of the graph root
// (e.g. mounted layers of a container) can traverse this path.
// The user namespace support will create subdirectories for the remapped root host uid:gid
// pair owned by that same uid:gid pair for proper write access to those needed metadata and
// layer content subtrees.
if _, err := os.Stat(rootDir); err == nil {
// root current exists; we need to check for a prior migration
if _, err := os.Stat(filepath.Join(rootDir, nsRoot)); err != nil && os.IsNotExist(err) {
// need to migrate current root to "0.0" subroot
// 1. create non-usernamespaced root as "0.0"
if err := os.Mkdir(filepath.Join(rootDir, nsRoot), 0700); err != nil {
return fmt.Errorf("Cannot create daemon root %q: %v", filepath.Join(rootDir, nsRoot), err)
}
// 2. move current root content to "0.0" new subroot
if err := directory.MoveToSubdir(rootDir, nsRoot); err != nil {
return fmt.Errorf("Cannot migrate current daemon root %q for user namespaces: %v", rootDir, err)
}
// 3. chmod outer root to 755
if chmodErr := os.Chmod(rootDir, 0755); chmodErr != nil {
return chmodErr
}
}
} else if os.IsNotExist(err) {
// no root exists yet, create it 0755 with root:root ownership
if err := os.MkdirAll(rootDir, 0755); err != nil {
// root current exists; verify the access bits are correct by setting them
if err = os.Chmod(rootDir, 0701); err != nil {
return err
}
// create the "0.0" subroot (so no future "migration" happens of the root)
if err := os.Mkdir(filepath.Join(rootDir, nsRoot), 0700); err != nil {
} else if os.IsNotExist(err) {
// no root exists yet, create it 0701 with root:root ownership
if err := os.MkdirAll(rootDir, 0701); err != nil {
return err
}
}
// for user namespaces we will create a subtree underneath the specified root
// if user namespaces are enabled we will create a subtree underneath the specified root
// with any/all specified remapped root uid/gid options on the daemon creating
// a new subdirectory with ownership set to the remapped uid/gid (so as to allow
// `chdir()` to work for containers namespaced to that uid/gid)
if config.RemappedRoot != "" {
nsRoot = fmt.Sprintf("%d.%d", rootUID, rootGID)
}
config.Root = filepath.Join(rootDir, nsRoot)
logrus.Debugf("Creating actual daemon root: %s", config.Root)
// Create the root directory if it doesn't exists
if err := idtools.MkdirAllAs(config.Root, 0700, rootUID, rootGID); err != nil {
return fmt.Errorf("Cannot create daemon root: %s: %v", config.Root, err)
config.Root = filepath.Join(rootDir, fmt.Sprintf("%d.%d", rootUID, rootGID))
logrus.Debugf("Creating user namespaced daemon root: %s", config.Root)
// Create the root directory if it doesn't exists
if err := idtools.MkdirAllAs(config.Root, 0700, rootUID, rootGID); err != nil {
return fmt.Errorf("Cannot create daemon root: %s: %v", config.Root, err)
}
}
return nil
}

4
daemon/graphdriver/aufs/aufs.go
View file

@ -123,7 +123,7 @@ func Init(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
// Create the root aufs driver dir and return
// if it already exists
// If not populate the dir structure
if err := idtools.MkdirAllAs(root, 0755, rootUID, rootGID); err != nil {
if err := idtools.MkdirAllAs(root, 0700, rootUID, rootGID); err != nil {
if os.IsExist(err) {
return a, nil
}
@ -136,7 +136,7 @@ func Init(root string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
// Populate the dir structure
for _, p := range paths {
if err := idtools.MkdirAllAs(path.Join(root, p), 0755, rootUID, rootGID); err != nil {
if err := idtools.MkdirAllAs(path.Join(root, p), 0700, rootUID, rootGID); err != nil {
return nil, err
}
}

2
daemon/graphdriver/overlay/overlay.go
View file

@ -146,7 +146,7 @@ func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
return nil, err
}
// Create the driver home dir
if err := idtools.MkdirAllAs(home, 0755, rootUID, rootGID); err != nil && !os.IsExist(err) {
if err := idtools.MkdirAllAs(home, 0700, rootUID, rootGID); err != nil && !os.IsExist(err) {
return nil, err
}