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Make sure dev/fuse is created in container

Browse source 
Fixes #5849

If the host system does not have fuse enabled in the kernel config we
will ignore the is not exist errors when trying to copy the device node
from the host system into the container.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
This commit is contained in:
Michael Crosby 2014-05-19 20:46:59 +00:00
parent 30bd2bbc83
commit a87bcefb8b
2 changed files with 23 additions and 6 deletions
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5
pkg/libcontainer/mount/init.go
View file

@ -48,9 +48,12 @@ func InitializeMountNamespace(rootfs, console string, container *libcontainer.Co
if err := setupBindmounts(rootfs, container.Mounts); err != nil {
return fmt.Errorf("bind mounts %s", err)
}
if err := nodes.CopyN(rootfs, nodes.DefaultNodes); err != nil {
if err := nodes.CopyN(rootfs, nodes.DefaultNodes, true); err != nil {
return fmt.Errorf("copy dev nodes %s", err)
}
if err := nodes.CopyN(rootfs, nodes.AdditionalNodes, false); err != nil {
return fmt.Errorf("copy additional dev nodes %s", err)
}
if err := SetupPtmx(rootfs, console, container.Context["mount_label"]); err != nil {
return err
}

24
pkg/libcontainer/mount/nodes/nodes.go
View file

@ -4,10 +4,11 @@ package nodes
import (
"fmt"
"github.com/dotcloud/docker/pkg/system"
"os"
"path/filepath"
"syscall"
"github.com/dotcloud/docker/pkg/system"
)
// Default list of device nodes to copy
@ -20,30 +21,43 @@ var DefaultNodes = []string{
"tty",
}
// AdditionalNodes includes nodes that are not required
var AdditionalNodes = []string{
"fuse",
}
// CopyN copies the device node from the host into the rootfs
func CopyN(rootfs string, nodesToCopy []string) error {
func CopyN(rootfs string, nodesToCopy []string, shouldExist bool) error {
oldMask := system.Umask(0000)
defer system.Umask(oldMask)
for _, node := range nodesToCopy {
if err := Copy(rootfs, node); err != nil {
if err := Copy(rootfs, node, shouldExist); err != nil {
return err
}
}
return nil
}
func Copy(rootfs, node string) error {
// Copy copies the device node into the rootfs. If the node
// on the host system does not exist and the boolean flag is passed
// an error will be returned
func Copy(rootfs, node string, shouldExist bool) error {
stat, err := os.Stat(filepath.Join("/dev", node))
if err != nil {
if os.IsNotExist(err) && !shouldExist {
return nil
}
return err
}
var (
dest = filepath.Join(rootfs, "dev", node)
st = stat.Sys().(*syscall.Stat_t)
)
if err := system.Mknod(dest, st.Mode, int(st.Rdev)); err != nil && !os.IsExist(err) {
return fmt.Errorf("copy %s %s", node, err)
return fmt.Errorf("mknod %s %s", node, err)
}
return nil
}