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|
package debos
import (
"bytes"
"fmt"
"io"
"log"
"os"
"os/exec"
"path"
)
type ChrootEnterMethod int
const (
CHROOT_METHOD_NONE = iota // use nspawn to create the chroot environment
CHROOT_METHOD_NSPAWN // No chroot in use
CHROOT_METHOD_CHROOT // use chroot to create the chroot environment
)
type Command struct {
Architecture string // Architecture of the chroot, nil if same as host
Dir string // Working dir to run command in
Chroot string // Run in the chroot at path
ChrootMethod ChrootEnterMethod // Method to enter the chroot
bindMounts []string /// Items to bind mount
extraEnv []string // Extra environment variables to set
}
type commandWrapper struct {
label string
buffer *bytes.Buffer
}
func newCommandWrapper(label string) *commandWrapper {
b := bytes.Buffer{}
return &commandWrapper{label, &b}
}
func (w commandWrapper) out(atEOF bool) {
for {
s, err := w.buffer.ReadString('\n')
if err == nil {
log.Printf("%s | %v", w.label, s)
} else {
if len(s) > 0 {
if atEOF && err == io.EOF {
log.Printf("%s | %v\n", w.label, s)
} else {
w.buffer.WriteString(s)
}
}
break
}
}
}
func (w commandWrapper) Write(p []byte) (n int, err error) {
n, err = w.buffer.Write(p)
w.out(false)
return
}
func (w *commandWrapper) flush() {
w.out(true)
}
func NewChrootCommandForContext(context DebosContext) Command {
c := Command{Architecture: context.Architecture, Chroot: context.Rootdir, ChrootMethod: CHROOT_METHOD_NSPAWN}
if context.EnvironVars != nil {
for k, v := range context.EnvironVars {
c.AddEnv(fmt.Sprintf("%s=%s", k, v))
}
}
if context.Image != "" {
path, err := RealPath(context.Image)
if err == nil {
c.AddBindMount(path, "")
} else {
log.Printf("Failed to get realpath for %s, %v", context.Image, err)
}
for _, p := range context.ImagePartitions {
path, err := RealPath(p.DevicePath)
if err != nil {
log.Printf("Failed to get realpath for %s, %v", p.DevicePath, err)
continue
}
c.AddBindMount(path, "")
}
c.AddBindMount("/dev/disk", "")
}
return c
}
func (cmd *Command) AddEnv(env string) {
cmd.extraEnv = append(cmd.extraEnv, env)
}
func (cmd *Command) AddEnvKey(key, value string) {
cmd.extraEnv = append(cmd.extraEnv, fmt.Sprintf("%s=%s", key, value))
}
func (cmd *Command) AddBindMount(source, target string) {
var mount string
if target != "" {
mount = fmt.Sprintf("%s:%s", source, target)
} else {
mount = source
}
cmd.bindMounts = append(cmd.bindMounts, mount)
}
func (cmd Command) Run(label string, cmdline ...string) error {
q := newQemuHelper(cmd)
q.Setup()
var options []string
switch cmd.ChrootMethod {
case CHROOT_METHOD_NONE:
options = cmdline
case CHROOT_METHOD_CHROOT:
options = append(options, "chroot")
options = append(options, cmd.Chroot)
options = append(options, cmdline...)
case CHROOT_METHOD_NSPAWN:
options = append(options, "systemd-nspawn", "-q", "-D", cmd.Chroot)
for _, e := range cmd.extraEnv {
options = append(options, "--setenv", e)
}
for _, b := range cmd.bindMounts {
options = append(options, "--bind", b)
}
options = append(options, cmdline...)
}
exe := exec.Command(options[0], options[1:]...)
w := newCommandWrapper(label)
exe.Stdin = nil
exe.Stdout = w
exe.Stderr = w
if len(cmd.extraEnv) > 0 && cmd.ChrootMethod != CHROOT_METHOD_NSPAWN {
exe.Env = append(os.Environ(), cmd.extraEnv...)
}
// Disable services start/stop for commands running in chroot
if cmd.ChrootMethod != CHROOT_METHOD_NONE {
services := ServiceHelper{cmd.Chroot}
services.Deny()
defer services.Allow()
}
err := exe.Run()
w.flush()
q.Cleanup()
return err
}
type qemuHelper struct {
qemusrc string
qemutarget string
}
func newQemuHelper(c Command) qemuHelper {
q := qemuHelper{}
if c.Chroot == "" || c.Architecture == "" {
return q
}
switch c.Architecture {
case "armhf", "armel", "arm":
q.qemusrc = "/usr/bin/qemu-arm-static"
case "arm64":
q.qemusrc = "/usr/bin/qemu-aarch64-static"
case "mips":
q.qemusrc = "/usr/bin/qemu-mips-static"
case "mipsel":
q.qemusrc = "/usr/bin/qemu-mipsel-static"
case "mips64el":
q.qemusrc = "/usr/bin/qemu-mips64el-static"
case "riscv64":
q.qemusrc = "/usr/bin/qemu-riscv64-static"
case "amd64", "i386":
/* Dummy, no qemu */
default:
log.Panicf("Don't know qemu for Architecture %s", c.Architecture)
}
if q.qemusrc != "" {
q.qemutarget = path.Join(c.Chroot, q.qemusrc)
}
return q
}
func (q qemuHelper) Setup() error {
if q.qemusrc == "" {
return nil
}
return CopyFile(q.qemusrc, q.qemutarget, 0755)
}
func (q qemuHelper) Cleanup() {
if q.qemusrc != "" {
os.Remove(q.qemutarget)
}
}
|
