forked from exercism/cli
/
release_utils.go
154 lines (130 loc) · 2.88 KB
/
release_utils.go
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package cmd
import (
"archive/tar"
"archive/zip"
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strings"
)
var (
osMap = map[string]string{
"darwin": "mac",
"linux": "linux",
"windows": "windows",
}
archMap = map[string]string{
"amd64": "64bit",
"386": "32bit",
"arm": "arm",
}
)
type asset struct {
ID int `json:"id"`
Name string `json:"name"`
ContentType string `json:"content_type"`
}
func (a *asset) download() (*bytes.Reader, error) {
downloadURL := fmt.Sprintf("https://api.github.com/repos/exercism/cli/releases/assets/%d", a.ID)
req, err := http.NewRequest("GET", downloadURL, nil)
if err != nil {
return nil, err
}
// https://developer.github.com/v3/repos/releases/#get-a-single-release-asset
req.Header.Set("Accept", "application/octet-stream")
res, err := http.DefaultClient.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
bs, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
return bytes.NewReader(bs), nil
}
type release struct {
Location string `json:"html_url"`
TagName string `json:"tag_name"`
Assets []asset `json:"assets"`
}
func (r *release) Version() string {
return strings.TrimPrefix(r.TagName, "v")
}
const installFlag = os.O_RDWR | os.O_CREATE | os.O_TRUNC
func installTgz(source *bytes.Reader, dest string) error {
gr, err := gzip.NewReader(source)
if err != nil {
return err
}
defer gr.Close()
tr := tar.NewReader(gr)
for {
hdr, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
// Move the old version to a backup path that we can recover from
// in case the upgrade fails
destBackup := dest + ".bak"
if _, err := os.Stat(dest); err == nil {
os.Rename(dest, destBackup)
}
fileCopy, err := os.OpenFile(dest, installFlag, hdr.FileInfo().Mode())
if err != nil {
os.Rename(destBackup, dest)
return err
}
defer fileCopy.Close()
if _, err = io.Copy(fileCopy, tr); err != nil {
os.Rename(destBackup, dest)
return err
} else {
os.Remove(destBackup)
}
}
return nil
}
func installZip(source *bytes.Reader, dest string) error {
zr, err := zip.NewReader(source, int64(source.Len()))
if err != nil {
return err
}
for _, f := range zr.File {
fileCopy, err := os.OpenFile(dest, installFlag, f.Mode())
if err != nil {
return err
}
defer fileCopy.Close()
rc, err := f.Open()
if err != nil {
return err
}
defer rc.Close()
_, err = io.Copy(fileCopy, rc)
if err != nil {
return err
}
}
return nil
}
func fetchLatestRelease(client http.Client) (*release, error) {
resp, err := client.Get("https://api.github.com/repos/exercism/cli/releases/latest")
if err != nil {
return nil, err
}
defer resp.Body.Close()
var rel release
if err := json.NewDecoder(resp.Body).Decode(&rel); err != nil {
return nil, err
}
return &rel, nil
}