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2553029959
Initial move before enhancing cgroups package. Docker-DCO-1.1-Signed-off-by: Paul Nasrat <pnasrat@gmail.com> (github: pnasrat)
115 lines
3.3 KiB
Go
115 lines
3.3 KiB
Go
package execdriver
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import (
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"errors"
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"github.com/dotcloud/docker/pkg/cgroups"
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"os/exec"
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"syscall"
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)
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var (
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ErrNotRunning = errors.New("Process could not be started")
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ErrWaitTimeoutReached = errors.New("Wait timeout reached")
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ErrDriverAlreadyRegistered = errors.New("A driver already registered this docker init function")
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ErrDriverNotFound = errors.New("The requested docker init has not been found")
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)
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var dockerInitFcts map[string]InitFunc
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type (
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StartCallback func(*Process)
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InitFunc func(i *InitArgs) error
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)
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func RegisterInitFunc(name string, fct InitFunc) error {
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if dockerInitFcts == nil {
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dockerInitFcts = make(map[string]InitFunc)
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}
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if _, ok := dockerInitFcts[name]; ok {
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return ErrDriverAlreadyRegistered
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}
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dockerInitFcts[name] = fct
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return nil
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}
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func GetInitFunc(name string) (InitFunc, error) {
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fct, ok := dockerInitFcts[name]
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if !ok {
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return nil, ErrDriverNotFound
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}
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return fct, nil
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}
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// Args provided to the init function for a driver
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type InitArgs struct {
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User string
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Gateway string
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Ip string
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WorkDir string
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Privileged bool
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Env []string
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Args []string
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Mtu int
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Driver string
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}
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// Driver specific information based on
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// processes registered with the driver
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type Info interface {
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IsRunning() bool
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}
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type Driver interface {
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Run(c *Process, startCallback StartCallback) (int, error) // Run executes the process and blocks until the process exits and returns the exit code
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Kill(c *Process, sig int) error
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Wait(id string) error // Wait on an out of process...process - lxc ghosts TODO: Rename to reattach, reconnect
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Name() string // Driver name
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Info(id string) Info // "temporary" hack (until we move state from core to plugins)
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}
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// Network settings of the container
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type Network struct {
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Gateway string `json:"gateway"`
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IPAddress string `json:"ip"`
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Bridge string `json:"bridge"`
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IPPrefixLen int `json:"ip_prefix_len"`
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Mtu int `json:"mtu"`
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}
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// Process wrapps an os/exec.Cmd to add more metadata
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// TODO: Rename to Command
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type Process struct {
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exec.Cmd
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ID string `json:"id"`
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Privileged bool `json:"privileged"`
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User string `json:"user"`
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Rootfs string `json:"rootfs"` // root fs of the container
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InitPath string `json:"initpath"` // dockerinit
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Entrypoint string `json:"entrypoint"`
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Arguments []string `json:"arguments"`
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WorkingDir string `json:"working_dir"`
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ConfigPath string `json:"config_path"` // this should be able to be removed when the lxc template is moved into the driver
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Tty bool `json:"tty"`
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Network *Network `json:"network"` // if network is nil then networking is disabled
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Config []string `json:"config"` // generic values that specific drivers can consume
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Cgroups *cgroups.Values `json:"cgroups"`
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}
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// Return the pid of the process
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// If the process is nil -1 will be returned
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func (c *Process) Pid() int {
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if c.Process == nil {
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return -1
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}
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return c.Process.Pid
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}
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// Return the exit code of the process
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// if the process has not exited -1 will be returned
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func (c *Process) GetExitCode() int {
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if c.ProcessState == nil {
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return -1
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}
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return c.ProcessState.Sys().(syscall.WaitStatus).ExitStatus()
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}
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