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package image
import (
"fmt"
"io"
"net/url"
"regexp"
"strings"
cp "github.com/containers/image/v5/copy"
"github.com/containers/image/v5/docker/reference"
"github.com/containers/image/v5/signature"
"github.com/containers/image/v5/types"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/storage"
"github.com/pkg/errors"
)
// findImageInRepotags takes an imageParts struct and searches images' repotags for
// a match on name:tag
func findImageInRepotags(search imageParts, images []*Image) (*storage.Image, error) {
_, searchName, searchSuspiciousTagValueForSearch := search.suspiciousRefNameTagValuesForSearch()
type Candidate struct {
name string
image *Image
}
var candidates []Candidate
for _, image := range images {
for _, name := range image.Names() {
d, err := decompose(name)
// if we get an error, ignore and keep going
if err != nil {
continue
}
_, dName, dSuspiciousTagValueForSearch := d.suspiciousRefNameTagValuesForSearch()
if dSuspiciousTagValueForSearch != searchSuspiciousTagValueForSearch {
continue
}
if dName == searchName || strings.HasSuffix(dName, "/"+searchName) {
candidates = append(candidates, Candidate{
name: name,
image: image,
})
}
}
}
if len(candidates) == 0 {
return nil, errors.Wrapf(define.ErrNoSuchImage, "unable to find a name and tag match for %s in repotags", searchName)
}
// If more then one candidate and the candidates all have same name
// and only one is read/write return it.
// Othewise return error with the list of candidates
if len(candidates) > 1 {
var (
rwImage *Image
rwImageCnt int
)
names := make(map[string]bool)
for _, c := range candidates {
names[c.name] = true
if !c.image.IsReadOnly() {
rwImageCnt++
rwImage = c.image
}
}
// If only one name used and have read/write image return it
if len(names) == 1 && rwImageCnt == 1 {
return rwImage.image, nil
}
keys := []string{}
for k := range names {
keys = append(keys, k)
}
if rwImageCnt > 1 {
return nil, errors.Wrapf(define.ErrMultipleImages, "found multiple read/write images %s", strings.Join(keys, ","))
}
return nil, errors.Wrapf(define.ErrMultipleImages, "found multiple read/only images %s", strings.Join(keys, ","))
}
return candidates[0].image.image, nil
}
// getCopyOptions constructs a new containers/image/copy.Options{} struct from the given parameters, inheriting some from sc.
func getCopyOptions(sc *types.SystemContext, reportWriter io.Writer, srcDockerRegistry, destDockerRegistry *DockerRegistryOptions, signing SigningOptions, manifestType string, additionalDockerArchiveTags []reference.NamedTagged) *cp.Options {
if srcDockerRegistry == nil {
srcDockerRegistry = &DockerRegistryOptions{}
}
if destDockerRegistry == nil {
destDockerRegistry = &DockerRegistryOptions{}
}
srcContext := srcDockerRegistry.GetSystemContext(sc, additionalDockerArchiveTags)
destContext := destDockerRegistry.GetSystemContext(sc, additionalDockerArchiveTags)
return &cp.Options{
RemoveSignatures: signing.RemoveSignatures,
SignBy: signing.SignBy,
ReportWriter: reportWriter,
SourceCtx: srcContext,
DestinationCtx: destContext,
ForceManifestMIMEType: manifestType,
}
}
// getPolicyContext sets up, initializes and returns a new context for the specified policy
func getPolicyContext(ctx *types.SystemContext) (*signature.PolicyContext, error) {
policy, err := signature.DefaultPolicy(ctx)
if err != nil {
return nil, err
}
policyContext, err := signature.NewPolicyContext(policy)
if err != nil {
return nil, err
}
return policyContext, nil
}
// hasTransport determines if the image string contains '://', returns bool
func hasTransport(image string) bool {
return strings.Contains(image, "://")
}
// GetAdditionalTags returns a list of reference.NamedTagged for the
// additional tags given in images
func GetAdditionalTags(images []string) ([]reference.NamedTagged, error) {
var allTags []reference.NamedTagged
for _, img := range images {
ref, err := reference.ParseNormalizedNamed(img)
if err != nil {
return nil, errors.Wrapf(err, "error parsing additional tags")
}
refTagged, isTagged := ref.(reference.NamedTagged)
if isTagged {
allTags = append(allTags, refTagged)
}
}
return allTags, nil
}
// IsValidImageURI checks if image name has valid format
func IsValidImageURI(imguri string) (bool, error) {
uri := "http://" + imguri
u, err := url.Parse(uri)
if err != nil {
return false, errors.Wrapf(err, "invalid image uri: %s", imguri)
}
reg := regexp.MustCompile(`^[a-zA-Z0-9-_\.]+\/?:?[0-9]*[a-z0-9-\/:]*$`)
ret := reg.FindAllString(u.Host, -1)
if len(ret) == 0 {
return false, errors.Wrapf(err, "invalid image uri: %s", imguri)
}
reg = regexp.MustCompile(`^[a-z0-9-:\./]*$`)
ret = reg.FindAllString(u.Fragment, -1)
if len(ret) == 0 {
return false, errors.Wrapf(err, "invalid image uri: %s", imguri)
}
return true, nil
}
// imageNameForSaveDestination returns a Docker-like reference appropriate for saving img,
// which the user referred to as imgUserInput; or an empty string, if there is no appropriate
// reference.
func imageNameForSaveDestination(img *Image, imgUserInput string) string {
if strings.Contains(img.ID(), imgUserInput) {
return ""
}
prepend := ""
localRegistryPrefix := fmt.Sprintf("%s/", DefaultLocalRegistry)
if !strings.HasPrefix(imgUserInput, localRegistryPrefix) {
// we need to check if localhost was added to the image name in NewFromLocal
for _, name := range img.Names() {
// If the user is saving an image in the localhost registry, getLocalImage need
// a name that matches the format localhost/<tag1>:<tag2> or localhost/<tag>:latest to correctly
// set up the manifest and save.
if strings.HasPrefix(name, localRegistryPrefix) && (strings.HasSuffix(name, imgUserInput) || strings.HasSuffix(name, fmt.Sprintf("%s:latest", imgUserInput))) {
prepend = localRegistryPrefix
break
}
}
}
return fmt.Sprintf("%s%s", prepend, imgUserInput)
}
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