rootless: raise error if newuidmap/newgidmap are not installed
it was reported on IRC that Podman on Ubuntu failed as
newuidmap/newgidmap were not installed by default.
Raise an error if we are not allowing single mappings (used only by
the tests suite) and any of the binaries is not present.
@@ -74,7 +74,7 @@ func GetRootlessUID() int {
func tryMappingTool(tool string, pid int, hostID int, mappings []idtools.IDMap) error {
path, err := exec.LookPath(tool)
if err != nil {
- return err
+ return errors.Wrapf(err, "cannot find %s", tool)
}
appendTriplet := func(l []string, a, b, c int) []string {
@@ -92,7 +92,11 @@ func tryMappingTool(tool string, pid int, hostID int, mappings []idtools.IDMap)
Path: path,
Args: args,
}
- return cmd.Run()
+
+ if err := cmd.Run(); err != nil {
+ return errors.Wrapf(err, "cannot setup namespace using %s", tool)
+ }
+ return nil
}
// JoinNS re-exec podman in a new userNS and join the user namespace of the specified
@@ -191,11 +195,13 @@ func BecomeRootInUserNS() (bool, int, error) {
return false, -1, errors.Errorf("cannot re-exec process")
}
+ allowSingleIDMapping := os.Getenv("PODMAN_ALLOW_SINGLE_ID_MAPPING_IN_USERNS") != ""
+
var uids, gids []idtools.IDMap
username := os.Getenv("USER")
if username == "" {
user, err := user.LookupId(fmt.Sprintf("%d", os.Getuid()))
- if err != nil && os.Getenv("PODMAN_ALLOW_SINGLE_ID_MAPPING_IN_USERNS") == "" {
+ if err != nil && !allowSingleIDMapping {
if os.IsNotExist(err) {
return false, 0, errors.Wrapf(err, "/etc/subuid or /etc/subgid does not exist, see subuid/subgid man pages for information on these files")
}
@@ -206,7 +212,7 @@ func BecomeRootInUserNS() (bool, int, error) {
}
}
mappings, err := idtools.NewIDMappings(username, username)
- if os.Getenv("PODMAN_ALLOW_SINGLE_ID_MAPPING_IN_USERNS") == "" {
+ if !allowSingleIDMapping {
if err != nil {
return false, -1, err
}
@@ -236,7 +242,11 @@ func BecomeRootInUserNS() (bool, int, error) {
uidsMapped := false
if mappings != nil && uids != nil {
- uidsMapped = tryMappingTool("newuidmap", pid, os.Getuid(), uids) == nil
+ err := tryMappingTool("newuidmap", pid, os.Getuid(), uids)
+ if !allowSingleIDMapping && err != nil {
+ return false, 0, err
+ }
+ uidsMapped = err == nil
}
if !uidsMapped {
setgroups := fmt.Sprintf("/proc/%d/setgroups", pid)
@@ -254,7 +264,11 @@ func BecomeRootInUserNS() (bool, int, error) {
gidsMapped := false
if mappings != nil && gids != nil {
- gidsMapped = tryMappingTool("newgidmap", pid, os.Getgid(), gids) == nil
+ err := tryMappingTool("newgidmap", pid, os.Getgid(), gids)
+ if !allowSingleIDMapping && err != nil {
+ return false, 0, err
+ }
+ gidsMapped = err == nil
}
if !gidsMapped {
gidMap := fmt.Sprintf("/proc/%d/gid_map", pid)
