87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
package selfupdate
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import (
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"fmt"
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"net/http"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"github.com/blang/semver"
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"github.com/inconshreveable/go-update"
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)
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// UpdateTo download an executable from assetURL and replace the current binary with the downloaded one. cmdPath is a file path to command executable.
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func UpdateTo(assetURL, cmdPath string) error {
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res, err := http.Get(assetURL)
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if err != nil {
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return fmt.Errorf("Failed to download a release file from %s: %s", assetURL, err)
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}
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if res.StatusCode != 200 {
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return fmt.Errorf("Failed to download a release file from %s", assetURL)
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}
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defer res.Body.Close()
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_, cmd := filepath.Split(cmdPath)
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asset, err := UncompressCommand(res.Body, assetURL, cmd)
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if err != nil {
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return err
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}
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log.Println("Will update", cmdPath, "to the latest downloaded from", assetURL)
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return update.Apply(asset, update.Options{
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TargetPath: cmdPath,
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})
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}
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// UpdateCommand updates a given command binary to the latest version.
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// 'slug' represents 'owner/name' repository on GitHub and 'current' means the current version.
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func UpdateCommand(cmdPath string, current semver.Version, slug string) (*Release, error) {
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if runtime.GOOS == "windows" && !strings.HasSuffix(cmdPath, ".exe") {
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// Ensure to add '.exe' to given path on Windows
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cmdPath = cmdPath + ".exe"
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}
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stat, err := os.Lstat(cmdPath)
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if err != nil {
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return nil, fmt.Errorf("Failed to stat '%s'. File may not exist: %s", cmdPath, err)
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}
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if stat.Mode()&os.ModeSymlink != 0 {
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p, err := filepath.EvalSymlinks(cmdPath)
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if err != nil {
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return nil, fmt.Errorf("Failed to resolve symlink '%s' for executable: %s", cmdPath, err)
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}
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cmdPath = p
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}
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rel, ok, err := DetectLatest(slug)
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if err != nil {
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return nil, err
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}
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if !ok {
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log.Println("No release detected. Current version is considered up-to-date")
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return &Release{Version: current}, nil
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}
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if current.Equals(rel.Version) {
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log.Println("Current version", current, "is the latest. Update is not needed")
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return rel, nil
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}
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log.Println("Will update", cmdPath, "to the latest version", rel.Version)
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if err := UpdateTo(rel.AssetURL, cmdPath); err != nil {
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return nil, err
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}
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return rel, nil
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}
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// UpdateSelf updates the running executable itself to the latest version.
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// 'slug' represents 'owner/name' repository on GitHub and 'current' means the current version.
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func UpdateSelf(current semver.Version, slug string) (*Release, error) {
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cmdPath, err := os.Executable()
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if err != nil {
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return nil, err
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}
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return UpdateCommand(cmdPath, current, slug)
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}
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