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package main
import (
"encoding/json"
"fmt"
"os"
"slices"
"github.com/containers/storage"
"github.com/containers/storage/internal/opts"
"github.com/containers/storage/pkg/mflag"
"github.com/containers/storage/pkg/reexec"
"github.com/containers/storage/pkg/unshare"
"github.com/containers/storage/types"
"github.com/sirupsen/logrus"
)
type command struct {
names []string
optionsHelp string
minArgs int
maxArgs int
usage string
addFlags func(*mflag.FlagSet, *command)
action func(*mflag.FlagSet, string, storage.Store, []string) (int, error)
}
var (
commands = []command{}
jsonOutput = false
force = false
)
func main() {
if reexec.Init() {
return
}
options := types.StoreOptions{}
debug := false
doUnshare := false
makeFlags := func(command string, eh mflag.ErrorHandling) *mflag.FlagSet {
flags := mflag.NewFlagSet(command, eh)
flags.StringVar(&options.RunRoot, []string{"-run", "R"}, options.RunRoot, "Root of the runtime state tree")
flags.StringVar(&options.GraphRoot, []string{"-graph", "g"}, options.GraphRoot, "Root of the storage tree")
flags.StringVar(&options.ImageStore, []string{"-image-store"}, options.ImageStore, "Root of the separate image store")
flags.BoolVar(&options.TransientStore, []string{"-transient-store"}, options.TransientStore, "Transient store")
flags.StringVar(&options.GraphDriverName, []string{"-storage-driver", "s"}, options.GraphDriverName, "Storage driver to use ($STORAGE_DRIVER)")
flags.Var(opts.NewListOptsRef(&options.GraphDriverOptions, nil), []string{"-storage-opt"}, "Set storage driver options ($STORAGE_OPTS)")
flags.BoolVar(&debug, []string{"-debug", "D"}, debug, "Print debugging information")
flags.BoolVar(&doUnshare, []string{"-unshare", "U"}, unshare.IsRootless(), fmt.Sprintf("Run in a user namespace (default %t)", unshare.IsRootless()))
return flags
}
flags := makeFlags("containers-storage", mflag.ContinueOnError)
flags.Usage = func() {
fmt.Printf("Usage: containers-storage command [options [...]]\n\n")
fmt.Printf("Commands:\n\n")
for _, command := range commands {
fmt.Printf(" %-30s%s\n", command.names[0], command.usage)
}
fmt.Printf("\nOptions:\n")
flags.PrintDefaults()
}
if len(os.Args) < 2 {
flags.Usage()
os.Exit(1)
}
if err := flags.ParseFlags(os.Args[1:], true); err != nil {
fmt.Printf("%v while parsing arguments (1)\n", err)
flags.Usage()
os.Exit(1)
}
if options.GraphRoot == "" && options.RunRoot == "" && options.GraphDriverName == "" && len(options.GraphDriverOptions) == 0 {
options, _ = types.DefaultStoreOptions()
}
args := flags.Args()
if len(args) < 1 {
flags.Usage()
os.Exit(1)
return
}
name := args[0]
command := func() *command {
for i := range commands {
if slices.Contains(commands[i].names, name) {
return &commands[i]
}
}
fmt.Printf("%s: unrecognized command.\n", name)
os.Exit(1)
return nil // To satisfy linters.
}()
flags = makeFlags(name, mflag.ExitOnError)
if command.addFlags != nil {
command.addFlags(flags, command)
}
flags.Usage = func() {
fmt.Printf("Usage: containers-storage %s %s\n\n", name, command.optionsHelp)
fmt.Printf("%s\n", command.usage)
fmt.Printf("\nOptions:\n")
flags.PrintDefaults()
}
if err := flags.ParseFlags(args[1:], false); err != nil {
fmt.Printf("%v while parsing arguments (3)", err)
flags.Usage()
os.Exit(1)
}
args = flags.Args()
if command.minArgs != 0 && len(args) < command.minArgs {
fmt.Printf("%s: more arguments required.\n", name)
flags.Usage()
os.Exit(1)
}
if command.maxArgs >= 0 && command.maxArgs < command.minArgs {
panic(fmt.Sprintf("command %v requires more args (%d) than it allows (%d)", command.names, command.minArgs, command.maxArgs))
}
if command.maxArgs >= 0 && len(args) > command.maxArgs {
fmt.Printf("%s: too many arguments (%s).\n", name, args)
flags.Usage()
os.Exit(1)
}
if doUnshare {
unshare.MaybeReexecUsingUserNamespace(true)
}
if debug {
logrus.SetLevel(logrus.DebugLevel)
logrus.Debugf("Root: %s", options.GraphRoot)
logrus.Debugf("Run Root: %s", options.RunRoot)
logrus.Debugf("Driver Name: %s", options.GraphDriverName)
logrus.Debugf("Driver Options: %s", options.GraphDriverOptions)
} else {
logrus.SetLevel(logrus.ErrorLevel)
}
store, err := storage.GetStore(options)
if err != nil {
fmt.Printf("error initializing: %+v\n", err)
os.Exit(1)
}
store.Free()
res, err := command.action(flags, name, store, args)
if err != nil {
fmt.Fprintf(os.Stderr, "%+v\n", err)
}
os.Exit(res)
}
// outputJSON formats its input as JSON to stdout, and returns values suitable
// for directly returning from command.action
func outputJSON(data any) (int, error) {
if err := json.NewEncoder(os.Stdout).Encode(data); err != nil {
return 1, err
}
return 0, nil
}
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