/
version.go
123 lines (110 loc) · 3.34 KB
/
version.go
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package kit
import (
"crypto"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/hashicorp/go-version"
"github.com/inconshreveable/go-update"
)
var (
// ThemeKitVersion is the version build of the library
ThemeKitVersion, _ = version.NewVersion("0.7.5")
// ThemeKitReleasesURL is the url that fetches all versions of themekit used for.
// updating themekit. Change this for testing reasons.
ThemeKitReleasesURL = "https://shopify-themekit.s3.amazonaws.com/releases/all.json"
// ThemeKitLatestURL is the url that fetches new version of themekit. Change this
// for testing reasons.
ThemeKitLatestURL = "https://shopify-themekit.s3.amazonaws.com/releases/latest.json"
)
// IsNewUpdateAvailable will check if there is an update to the theme kit command
// and if there is one it will return true. Otherwise it will return false.
func IsNewUpdateAvailable() bool {
release, err := FetchLatest()
if err != nil {
return false
}
return release.IsApplicable()
}
// InstallThemeKitVersion will take a semver string and parse it then check if that
// update is available and install it. If the string is 'latest' it will install
// the most current. If the string is latest and there is no update it will return an
// error. An error will also be returned if the requested version does not exist.
func InstallThemeKitVersion(ver string) error {
if ver == "latest" {
release, err := FetchLatest()
if err != nil {
return err
}
if !release.IsApplicable() {
return fmt.Errorf("no applicable update available")
}
return applyUpdate(release.ForCurrentPlatform())
}
releases, err := FetchReleases()
if err != nil {
return err
}
requestedRelease := releases.Get(ver)
if !requestedRelease.IsValid() {
return fmt.Errorf("version %s not found", ver)
}
return applyUpdate(requestedRelease.ForCurrentPlatform())
}
// FetchLatest fetches the most recently released version of themekit.
//
// Used for internal purposes but exposed for cross package functionality
func FetchLatest() (Release, error) {
var latest Release
resp, err := http.Get(ThemeKitLatestURL)
if err != nil {
return latest, err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err == nil {
err = json.Unmarshal(data, &latest)
}
return latest, err
}
// FetchReleases fetches all the versions of themekit ever released.
//
// Used for internal purposes but exposed for cross package functionality
func FetchReleases() (ReleasesList, error) {
var releases ReleasesList
resp, err := http.Get(ThemeKitReleasesURL)
if err != nil {
return releases, err
}
defer resp.Body.Close()
data, err := ioutil.ReadAll(resp.Body)
if err == nil {
err = json.Unmarshal(data, &releases)
}
return releases, err
}
func applyUpdate(platformRelease Platform) error {
checksum, err := hex.DecodeString(platformRelease.Digest)
if err != nil {
return err
}
updateFile, err := http.Get(platformRelease.URL)
if err != nil {
return err
}
defer updateFile.Body.Close()
err = update.Apply(updateFile.Body, update.Options{
TargetPath: platformRelease.TargetPath, //used for testing
Hash: crypto.MD5,
Checksum: checksum,
})
if err != nil {
if rerr := update.RollbackError(err); rerr != nil {
return fmt.Errorf("Failed to rollback from bad update: %v", rerr)
}
return fmt.Errorf("Could not update and had to roll back. %v", err)
}
return nil
}