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authorGiuseppe Scrivano <gscrivan@redhat.com>2019-03-19 12:08:52 +0100
committerGiuseppe Scrivano <gscrivan@redhat.com>2019-04-01 15:32:58 +0200
commit72382a12a7b5ac85e53474dfd6dcd83cd64a2738 (patch)
tree583f29064a2f11241895c23eabbd75cc1d5eb332 /libpod
parented326206f2b0ed80cdeddc63430bfbe60016c7df (diff)
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rootless: use a single user namespace
simplify the rootless implementation to use a single user namespace for all the running containers. This makes the rootless implementation behave more like root Podman, where each container is created in the host environment. There are multiple advantages to it: 1) much simpler implementation as there is only one namespace to join. 2) we can join namespaces owned by different containers. 3) commands like ps won't be limited to what container they can access as previously we either had access to the storage from a new namespace or access to /proc when running from the host. 4) rootless varlink works. 5) there are only two ways to enter in a namespace, either by creating a new one if no containers are running or joining the existing one from any container. Containers created by older Podman versions must be restarted. Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Diffstat (limited to 'libpod')
-rw-r--r--libpod/runtime.go28
-rw-r--r--libpod/runtime_ctr.go33
2 files changed, 2 insertions, 59 deletions
diff --git a/libpod/runtime.go b/libpod/runtime.go
index 6fb325c51..4dd2707e8 100644
--- a/libpod/runtime.go
+++ b/libpod/runtime.go
@@ -4,7 +4,6 @@ import (
"fmt"
"io/ioutil"
"os"
- "os/exec"
"path/filepath"
"sync"
"syscall"
@@ -926,16 +925,8 @@ func makeRuntime(runtime *Runtime) (err error) {
// If we need to refresh the state, do it now - things are guaranteed to
// be set up by now.
if doRefresh {
- if os.Geteuid() != 0 {
- aliveLock.Unlock()
- locked = false
- if err2 := runtime.refreshRootless(); err2 != nil {
- return err2
- }
- } else {
- if err2 := runtime.refresh(runtimeAliveFile); err2 != nil {
- return err2
- }
+ if err2 := runtime.refresh(runtimeAliveFile); err2 != nil {
+ return err2
}
}
@@ -1009,21 +1000,6 @@ func (r *Runtime) Shutdown(force bool) error {
return lastError
}
-// Reconfigures the runtime after a reboot for a rootless process
-func (r *Runtime) refreshRootless() error {
- // Take advantage of a command that requires a new userns
- // so that we are running as the root user and able to use refresh()
- cmd := exec.Command(os.Args[0], "info")
-
- if output, err := cmd.CombinedOutput(); err != nil {
- if _, ok := err.(*exec.ExitError); !ok {
- return errors.Wrapf(err, "Error waiting for info while refreshing state: %s", os.Args[0])
- }
- return errors.Wrapf(err, "Error running %s info while refreshing state: %s", os.Args[0], output)
- }
- return nil
-}
-
// Reconfigures the runtime after a reboot
// Refreshes the state, recreating temporary files
// Does not check validity as the runtime is not valid until after this has run
diff --git a/libpod/runtime_ctr.go b/libpod/runtime_ctr.go
index 506aee477..da2399685 100644
--- a/libpod/runtime_ctr.go
+++ b/libpod/runtime_ctr.go
@@ -2,11 +2,9 @@ package libpod
import (
"context"
- "io/ioutil"
"os"
"path"
"path/filepath"
- "strconv"
"strings"
"time"
@@ -564,37 +562,6 @@ func (r *Runtime) Export(name string, path string) error {
if err != nil {
return err
}
- if os.Geteuid() != 0 {
- state, err := ctr.State()
- if err != nil {
- return errors.Wrapf(err, "cannot read container state %q", ctr.ID())
- }
- if state == ContainerStateRunning || state == ContainerStatePaused {
- data, err := ioutil.ReadFile(ctr.Config().ConmonPidFile)
- if err != nil {
- return errors.Wrapf(err, "cannot read conmon PID file %q", ctr.Config().ConmonPidFile)
- }
- conmonPid, err := strconv.Atoi(string(data))
- if err != nil {
- return errors.Wrapf(err, "cannot parse PID %q", data)
- }
- became, ret, err := rootless.JoinDirectUserAndMountNS(uint(conmonPid))
- if err != nil {
- return err
- }
- if became {
- os.Exit(ret)
- }
- } else {
- became, ret, err := rootless.BecomeRootInUserNS()
- if err != nil {
- return err
- }
- if became {
- os.Exit(ret)
- }
- }
- }
return ctr.Export(path)
}