| 1 | package migrations |
| 2 | |
| 3 | import ( |
| 4 | "bufio" |
| 5 | "bytes" |
| 6 | "context" |
| 7 | "errors" |
| 8 | "fmt" |
| 9 | "path" |
| 10 | "sort" |
| 11 | "strings" |
| 12 | |
| 13 | "github.com/blang/semver/v4" |
| 14 | ) |
| 15 | |
| 16 | const distVersions = "versions" |
| 17 | |
| 18 | // LatestDistVersion returns the latest version, of the specified distribution, |
| 19 | // that is available on the distribution site. |
| 20 | func LatestDistVersion(ctx context.Context, fetcher Fetcher, dist string, stableOnly bool) (string, error) { |
| 21 | vs, err := DistVersions(ctx, fetcher, dist, false) |
| 22 | if err != nil { |
| 23 | return "", err |
| 24 | } |
| 25 | |
| 26 | for i := len(vs) - 1; i >= 0; i-- { |
| 27 | ver := vs[i] |
| 28 | if stableOnly && strings.Contains(ver, "-rc") { |
| 29 | continue |
| 30 | } |
| 31 | if strings.Contains(ver, "-dev") { |
| 32 | continue |
| 33 | } |
| 34 | return ver, nil |
| 35 | } |
| 36 | return "", errors.New("could not find a non dev version") |
| 37 | } |
| 38 | |
| 39 | // DistVersions returns all versions of the specified distribution, that are |
| 40 | // available on the distriburion site. List is in ascending order, unless |
| 41 | // sortDesc is true. |
| 42 | func DistVersions(ctx context.Context, fetcher Fetcher, dist string, sortDesc bool) ([]string, error) { |
| 43 | versionBytes, err := fetcher.Fetch(ctx, path.Join(dist, distVersions)) |
| 44 | if err != nil { |
| 45 | return nil, err |
| 46 | } |
| 47 | |
| 48 | prefix := "v" |
| 49 | var vers []semver.Version |
| 50 | |
| 51 | scan := bufio.NewScanner(bytes.NewReader(versionBytes)) |
| 52 | for scan.Scan() { |
| 53 | ver, err := semver.Make(strings.TrimLeft(scan.Text(), prefix)) |
| 54 | if err != nil { |
| 55 | continue |
| 56 | } |
| 57 | vers = append(vers, ver) |
| 58 | } |
| 59 | if scan.Err() != nil { |
| 60 | return nil, fmt.Errorf("could not read versions: %w", scan.Err()) |
| 61 | } |
| 62 | |
| 63 | if sortDesc { |
| 64 | sort.Sort(sort.Reverse(semver.Versions(vers))) |
| 65 | } else { |
| 66 | sort.Sort(semver.Versions(vers)) |
| 67 | } |
| 68 | |
| 69 | out := make([]string, len(vers)) |
| 70 | for i := range vers { |
| 71 | out[i] = prefix + vers[i].String() |
| 72 | } |
| 73 | |
| 74 | return out, nil |
| 75 | } |