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products.go
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products.go
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package simplestreams
import (
"fmt"
"strings"
"time"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/api"
"github.com/lxc/lxd/shared/osarch"
)
// Products represents the base of download.json
type Products struct {
ContentID string `json:"content_id"`
DataType string `json:"datatype"`
Format string `json:"format"`
License string `json:"license,omitempty"`
Products map[string]Product `json:"products"`
Updated string `json:"updated,omitempty"`
}
// Product represents a single product inside download.json
type Product struct {
Aliases string `json:"aliases"`
Architecture string `json:"arch"`
OperatingSystem string `json:"os"`
Release string `json:"release"`
ReleaseCodename string `json:"release_codename,omitempty"`
ReleaseTitle string `json:"release_title"`
Supported bool `json:"supported,omitempty"`
SupportedEOL string `json:"support_eol,omitempty"`
Version string `json:"version,omitempty"`
Versions map[string]ProductVersion `json:"versions"`
// Non-standard fields (only used on some image servers).
Variant string `json:"variant,omitempty"`
}
// ProductVersion represents a particular version of a product
type ProductVersion struct {
Items map[string]ProductVersionItem `json:"items"`
Label string `json:"label,omitempty"`
PublicName string `json:"pubname,omitempty"`
}
// ProductVersionItem represents a file/item of a particular ProductVersion
type ProductVersionItem struct {
LXDHashSha256DiskImg string `json:"combined_disk1-img_sha256,omitempty"`
LXDHashSha256DiskKvmImg string `json:"combined_disk-kvm-img_sha256,omitempty"`
LXDHashSha256DiskUefiImg string `json:"combined_uefi1-img_sha256,omitempty"`
LXDHashSha256RootXz string `json:"combined_rootxz_sha256,omitempty"`
LXDHashSha256 string `json:"combined_sha256,omitempty"`
LXDHashSha256SquashFs string `json:"combined_squashfs_sha256,omitempty"`
FileType string `json:"ftype"`
HashMd5 string `json:"md5,omitempty"`
Path string `json:"path"`
HashSha256 string `json:"sha256,omitempty"`
Size int64 `json:"size"`
DeltaBase string `json:"delta_base,omitempty"`
}
// ToLXD converts the products data into a list of LXD images and associated downloadable files
func (s *Products) ToLXD() ([]api.Image, map[string][][]string) {
downloads := map[string][][]string{}
images := []api.Image{}
nameLayout := "20060102"
eolLayout := "2006-01-02"
for _, product := range s.Products {
// Skip unsupported architectures
architecture, err := osarch.ArchitectureId(product.Architecture)
if err != nil {
continue
}
architectureName, err := osarch.ArchitectureName(architecture)
if err != nil {
continue
}
for name, version := range product.Versions {
// Short of anything better, use the name as date (see format above)
if len(name) < 8 {
continue
}
creationDate, err := time.Parse(nameLayout, name[0:8])
if err != nil {
continue
}
// Image processing function
addImage := func(meta *ProductVersionItem, root *ProductVersionItem) error {
// Look for deltas (only on squashfs)
deltas := []ProductVersionItem{}
if root != nil && root.FileType == "squashfs" {
for _, item := range version.Items {
if item.FileType == "squashfs.vcdiff" {
deltas = append(deltas, item)
}
}
}
// Figure out the fingerprint
fingerprint := ""
if root != nil {
if root.FileType == "root.tar.xz" {
if meta.LXDHashSha256RootXz != "" {
fingerprint = meta.LXDHashSha256RootXz
} else {
fingerprint = meta.LXDHashSha256
}
} else if root.FileType == "squashfs" {
fingerprint = meta.LXDHashSha256SquashFs
} else if root.FileType == "disk-kvm.img" {
fingerprint = meta.LXDHashSha256DiskKvmImg
} else if root.FileType == "disk1.img" {
fingerprint = meta.LXDHashSha256DiskImg
} else if root.FileType == "uefi1.img" {
fingerprint = meta.LXDHashSha256DiskUefiImg
}
} else {
fingerprint = meta.HashSha256
}
if fingerprint == "" {
return fmt.Errorf("No LXD image fingerprint found")
}
// Figure out the size
size := meta.Size
if root != nil {
size += root.Size
}
// Determine filename
if meta.Path == "" {
return fmt.Errorf("Missing path field on metadata entry")
}
fields := strings.Split(meta.Path, "/")
filename := fields[len(fields)-1]
// Generate the actual image entry
description := fmt.Sprintf("%s %s %s", product.OperatingSystem, product.ReleaseTitle, product.Architecture)
if version.Label != "" {
description = fmt.Sprintf("%s (%s)", description, version.Label)
}
description = fmt.Sprintf("%s (%s)", description, name)
image := api.Image{}
image.Architecture = architectureName
image.Public = true
image.Size = size
image.CreatedAt = creationDate
image.UploadedAt = creationDate
image.Filename = filename
image.Fingerprint = fingerprint
image.Properties = map[string]string{
"os": product.OperatingSystem,
"release": product.Release,
"version": product.Version,
"architecture": product.Architecture,
"label": version.Label,
"serial": name,
"description": description,
}
if product.Variant != "" {
image.Properties["variant"] = product.Variant
}
image.Type = "container"
if root != nil {
image.Properties["type"] = root.FileType
if root.FileType == "disk1.img" || root.FileType == "disk-kvm.img" || root.FileType == "uefi1.img" {
image.Type = "virtual-machine"
}
} else {
image.Properties["type"] = "tar.gz"
}
// Clear unset properties
for k, v := range image.Properties {
if v == "" {
delete(image.Properties, k)
}
}
// Add the provided aliases
if product.Aliases != "" {
image.Aliases = []api.ImageAlias{}
for _, entry := range strings.Split(product.Aliases, ",") {
image.Aliases = append(image.Aliases, api.ImageAlias{Name: entry})
}
}
// Attempt to parse the EOL
image.ExpiresAt = time.Unix(0, 0).UTC()
if product.SupportedEOL != "" {
eolDate, err := time.Parse(eolLayout, product.SupportedEOL)
if err == nil {
image.ExpiresAt = eolDate
}
}
// Set the file list
var imgDownloads [][]string
if root == nil {
imgDownloads = [][]string{{meta.Path, meta.HashSha256, "meta", fmt.Sprintf("%d", meta.Size)}}
} else {
imgDownloads = [][]string{
{meta.Path, meta.HashSha256, "meta", fmt.Sprintf("%d", meta.Size)},
{root.Path, root.HashSha256, "root", fmt.Sprintf("%d", root.Size)}}
}
// Add the deltas
for _, delta := range deltas {
srcImage, ok := product.Versions[delta.DeltaBase]
if !ok {
// Delta for a since expired image
continue
}
// Locate source image fingerprint
var srcFingerprint string
for _, item := range srcImage.Items {
if item.FileType != "lxd.tar.xz" {
continue
}
srcFingerprint = item.LXDHashSha256SquashFs
break
}
if srcFingerprint == "" {
// Couldn't find the image
continue
}
// Add the delta
imgDownloads = append(imgDownloads, []string{
delta.Path,
delta.HashSha256,
fmt.Sprintf("root.delta-%s", srcFingerprint),
fmt.Sprintf("%d", delta.Size)})
}
// Add the image
downloads[fingerprint] = imgDownloads
images = append(images, image)
return nil
}
// Locate a valid LXD image
for _, item := range version.Items {
if item.FileType == "lxd_combined.tar.gz" {
err := addImage(&item, nil)
if err != nil {
continue
}
}
if item.FileType == "lxd.tar.xz" {
// Locate the root files
for _, subItem := range version.Items {
if shared.StringInSlice(subItem.FileType, []string{"disk1.img", "disk-kvm.img", "uefi1.img", "root.tar.xz", "squashfs"}) {
err := addImage(&item, &subItem)
if err != nil {
continue
}
}
}
}
}
}
}
return images, downloads
}