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package util
import (
"fmt"
"os"
"strconv"
"strings"
"github.com/containers/image/types"
"github.com/containers/storage"
"github.com/containers/storage/pkg/idtools"
"github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh/terminal"
)
// Helper function to determine the username/password passed
// in the creds string. It could be either or both.
func parseCreds(creds string) (string, string) {
if creds == "" {
return "", ""
}
up := strings.SplitN(creds, ":", 2)
if len(up) == 1 {
return up[0], ""
}
return up[0], up[1]
}
// ParseRegistryCreds takes a credentials string in the form USERNAME:PASSWORD
// and returns a DockerAuthConfig
func ParseRegistryCreds(creds string) (*types.DockerAuthConfig, error) {
username, password := parseCreds(creds)
if username == "" {
fmt.Print("Username: ")
fmt.Scanln(&username)
}
if password == "" {
fmt.Print("Password: ")
termPassword, err := terminal.ReadPassword(0)
if err != nil {
return nil, errors.Wrapf(err, "could not read password from terminal")
}
password = string(termPassword)
}
return &types.DockerAuthConfig{
Username: username,
Password: password,
}, nil
}
// StringInSlice determines if a string is in a string slice, returns bool
func StringInSlice(s string, sl []string) bool {
for _, i := range sl {
if i == s {
return true
}
}
return false
}
// GetImageConfig converts the --change flag values in the format "CMD=/bin/bash USER=example"
// to a type v1.ImageConfig
func GetImageConfig(changes []string) (v1.ImageConfig, error) {
// USER=value | EXPOSE=value | ENV=value | ENTRYPOINT=value |
// CMD=value | VOLUME=value | WORKDIR=value | LABEL=key=value | STOPSIGNAL=value
var (
user string
env []string
entrypoint []string
cmd []string
workingDir string
stopSignal string
)
exposedPorts := make(map[string]struct{})
volumes := make(map[string]struct{})
labels := make(map[string]string)
for _, ch := range changes {
pair := strings.Split(ch, "=")
if len(pair) == 1 {
return v1.ImageConfig{}, errors.Errorf("no value given for instruction %q", ch)
}
switch pair[0] {
case "USER":
user = pair[1]
case "EXPOSE":
var st struct{}
exposedPorts[pair[1]] = st
case "ENV":
env = append(env, pair[1])
case "ENTRYPOINT":
entrypoint = append(entrypoint, pair[1])
case "CMD":
cmd = append(cmd, pair[1])
case "VOLUME":
var st struct{}
volumes[pair[1]] = st
case "WORKDIR":
workingDir = pair[1]
case "LABEL":
if len(pair) == 3 {
labels[pair[1]] = pair[2]
} else {
labels[pair[1]] = ""
}
case "STOPSIGNAL":
stopSignal = pair[1]
}
}
return v1.ImageConfig{
User: user,
ExposedPorts: exposedPorts,
Env: env,
Entrypoint: entrypoint,
Cmd: cmd,
Volumes: volumes,
WorkingDir: workingDir,
Labels: labels,
StopSignal: stopSignal,
}, nil
}
// ParseIDMapping takes idmappings and subuid and subgid maps and returns a storage mapping
func ParseIDMapping(UIDMapSlice, GIDMapSlice []string, subUIDMap, subGIDMap string) (*storage.IDMappingOptions, error) {
options := storage.IDMappingOptions{
HostUIDMapping: true,
HostGIDMapping: true,
}
if subGIDMap == "" && subUIDMap != "" {
subGIDMap = subUIDMap
}
if subUIDMap == "" && subGIDMap != "" {
subUIDMap = subGIDMap
}
if len(GIDMapSlice) == 0 && len(UIDMapSlice) != 0 {
GIDMapSlice = UIDMapSlice
}
if len(UIDMapSlice) == 0 && len(GIDMapSlice) != 0 {
UIDMapSlice = GIDMapSlice
}
if len(UIDMapSlice) == 0 && subUIDMap == "" && os.Getuid() != 0 {
UIDMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getuid())}
}
if len(GIDMapSlice) == 0 && subGIDMap == "" && os.Getuid() != 0 {
GIDMapSlice = []string{fmt.Sprintf("0:%d:1", os.Getgid())}
}
parseTriple := func(spec []string) (container, host, size int, err error) {
cid, err := strconv.ParseUint(spec[0], 10, 32)
if err != nil {
return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[0], err)
}
hid, err := strconv.ParseUint(spec[1], 10, 32)
if err != nil {
return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[1], err)
}
sz, err := strconv.ParseUint(spec[2], 10, 32)
if err != nil {
return 0, 0, 0, fmt.Errorf("error parsing id map value %q: %v", spec[2], err)
}
return int(cid), int(hid), int(sz), nil
}
parseIDMap := func(spec []string) (idmap []idtools.IDMap, err error) {
for _, uid := range spec {
splitmap := strings.SplitN(uid, ":", 3)
if len(splitmap) < 3 {
return nil, fmt.Errorf("invalid mapping requires 3 fields: %q", uid)
}
cid, hid, size, err := parseTriple(splitmap)
if err != nil {
return nil, err
}
pmap := idtools.IDMap{
ContainerID: cid,
HostID: hid,
Size: size,
}
idmap = append(idmap, pmap)
}
return idmap, nil
}
if subUIDMap != "" && subGIDMap != "" {
mappings, err := idtools.NewIDMappings(subUIDMap, subGIDMap)
if err != nil {
return nil, err
}
options.UIDMap = mappings.UIDs()
options.GIDMap = mappings.GIDs()
}
parsedUIDMap, err := parseIDMap(UIDMapSlice)
if err != nil {
return nil, err
}
parsedGIDMap, err := parseIDMap(GIDMapSlice)
if err != nil {
return nil, err
}
options.UIDMap = append(options.UIDMap, parsedUIDMap...)
options.GIDMap = append(options.GIDMap, parsedGIDMap...)
if len(options.UIDMap) > 0 {
options.HostUIDMapping = false
}
if len(options.GIDMap) > 0 {
options.HostGIDMapping = false
}
return &options, nil
}
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