46 lines
1.4 KiB
Go
46 lines
1.4 KiB
Go
package nsinit
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import (
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"github.com/dotcloud/docker/pkg/libcontainer"
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"github.com/dotcloud/docker/pkg/system"
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"os"
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"os/exec"
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)
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// CommandFactory takes the container's configuration and options passed by the
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// parent processes and creates an *exec.Cmd that will be used to fork/exec the
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// namespaced init process
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type CommandFactory interface {
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Create(container *libcontainer.Container, console string, syncFd *os.File, args []string) *exec.Cmd
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}
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type DefaultCommandFactory struct {
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Root string
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}
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// Create will return an exec.Cmd with the Cloneflags set to the proper namespaces
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// defined on the container's configuration and use the current binary as the init with the
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// args provided
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func (c *DefaultCommandFactory) Create(container *libcontainer.Container, console string, pipe *os.File, args []string) *exec.Cmd {
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// get our binary name from arg0 so we can always reexec ourself
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command := exec.Command(os.Args[0], append([]string{
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"-console", console,
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"-pipe", "3",
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"-root", c.Root,
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"init"}, args...)...)
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system.SetCloneFlags(command, uintptr(GetNamespaceFlags(container.Namespaces)))
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command.Env = container.Env
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command.ExtraFiles = []*os.File{pipe}
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return command
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}
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// GetNamespaceFlags parses the container's Namespaces options to set the correct
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// flags on clone, unshare, and setns
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func GetNamespaceFlags(namespaces libcontainer.Namespaces) (flag int) {
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for _, ns := range namespaces {
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flag |= ns.Value
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}
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return flag
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}
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