go-sandbox/container/container_cmd_linux.go

109 lines
2.5 KiB
Go

package container
import (
"bufio"
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/criyle/go-sandbox/pkg/unixsocket"
)
func (c *containerServer) handlePing() error {
return c.sendReply(reply{}, unixsocket.Msg{})
}
func (c *containerServer) handleConf(conf *confCmd) error {
if conf != nil {
c.containerConfig = conf.Conf
if err := initContainer(conf.Conf); err != nil {
return err
}
if c.ContainerUID == 0 {
c.ContainerUID = containerUID
}
if c.ContainerGID == 0 {
c.ContainerGID = containerGID
}
env, err := readDotEnv()
if err != nil {
return err
}
c.defaultEnv = env
}
return c.sendReply(reply{}, unixsocket.Msg{})
}
func (c *containerServer) handleOpen(open []OpenCmd) error {
if len(open) == 0 {
return c.sendErrorReply("open: no open parameter received")
}
// open files
fds := make([]int, 0, len(open))
fileToClose := make([]*os.File, 0, len(open)) // let sendMsg close these files
for _, o := range open {
outFile, err := os.OpenFile(o.Path, o.Flag, o.Perm)
if err != nil {
for _, f := range fileToClose {
f.Close()
}
return c.sendErrorReply("open: %v", err)
}
fileToClose = append(fileToClose, outFile)
fds = append(fds, int(outFile.Fd()))
}
return c.sendReplyFiles(reply{}, unixsocket.Msg{Fds: fds}, fileToClose)
}
func (c *containerServer) handleDelete(delete *deleteCmd) error {
if delete == nil {
return c.sendErrorReply("delete: no parameter provided")
}
if err := os.Remove(delete.Path); err != nil {
return c.sendErrorReply("delete: %v", err)
}
return c.sendReply(reply{}, unixsocket.Msg{})
}
func (c *containerServer) handleReset() error {
for _, m := range c.Mounts {
if !m.IsTmpFs() {
continue
}
if err := removeContents(filepath.Join("/", m.Target)); err != nil {
return c.sendErrorReply("reset: %v %v", m.Target, err)
}
}
return c.sendReply(reply{}, unixsocket.Msg{})
}
// readDotEnv attempts to read /.env file and save as default environment variables
func readDotEnv() ([]string, error) {
f, err := os.Open("/.env")
if err != nil {
if errors.Is(err, os.ErrNotExist) {
return nil, nil
}
return nil, fmt.Errorf("dotenv: open /.env: %w", err)
}
defer f.Close()
var ret []string
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if len(line) == 0 || strings.HasPrefix(line, "#") {
continue
}
if !strings.Contains(line, "=") {
return nil, fmt.Errorf("dotenv: invalid line: %s", line)
}
ret = append(ret, line)
}
return ret, nil
}