Add version checking utils (#7)

versionutils/repo.go

@@ -0,0 +1,79 @@
+package version
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+
+	"github.com/pelletier/go-toml"
+	"github.com/pkg/errors"
+)
+
+const (
+	gopkgToml    = "Gopkg.toml"
+	constraint   = "constraint"
+	nameConst    = "name"
+	versionConst = "version"
+
+	GlooPkg    = "github.com/solo-io/gloo"
+	SoloKitPkg = "github.com/solo-io/solo-kit"
+)
+
+func PinGitVersion(relativeRepoDir string, version string) error {
+	tag := GetTag(version)
+	cmd := exec.Command("git", "checkout", tag)
+	cmd.Dir = relativeRepoDir
+	buf := &bytes.Buffer{}
+	out := io.MultiWriter(buf, os.Stdout)
+	cmd.Stdout = out
+	cmd.Stderr = out
+	if err := cmd.Run(); err != nil {
+		return errors.Wrapf(err, "%v failed: %s", cmd.Args, buf.String())
+	}
+	return nil
+}
+
+func GetGitVersion(relativeRepoDir string) (string, error) {
+	cmd := exec.Command("git", "describe", "--tags", "--dirty")
+	cmd.Dir = relativeRepoDir
+	output, err := cmd.Output()
+	if err != nil {
+		return "", errors.Wrapf(err, "%v failed: %s", cmd.Args, output)
+	}
+	return strings.TrimSpace(string(output)), nil
+}
+
+func GetTag(version string) string {
+	if strings.HasPrefix(version, "v") {
+		return version
+	}
+	return "v" + version
+}
+
+func GetVersion(pkgName string, tomlTree []*toml.Tree) (string, error) {
+	for _, v := range tomlTree {
+		if v.Get(nameConst) == pkgName && v.Get(versionConst) != "" {
+			return v.Get(versionConst).(string), nil
+		}
+	}
+	return "", fmt.Errorf("unable to find version for %s in toml", pkgName)
+}
+
+func ParseToml() ([]*toml.Tree, error) {
+	config, err := toml.LoadFile(gopkgToml)
+	if err != nil {
+		return nil, err
+	}
+
+	tomlTree := config.Get(constraint)
+
+	switch typedTree := tomlTree.(type) {
+	case []*toml.Tree:
+		return typedTree, nil
+	default:
+		return nil, fmt.Errorf("unable to parse toml tree")
+	}
+}