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version.go
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version.go
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package version
import (
"fmt"
"os/exec"
"strconv"
"strings"
)
type Version struct {
Major int
Minor int
Patch int
Pre string
Commit string
}
func Parse(desc string) (Version, error) {
if len(desc) < 5 {
return Version{}, fmt.Errorf("description too short to parse: %q", desc)
}
if desc[0] == 'r' || desc[0] == 'v' {
desc = desc[1:]
}
parts := strings.SplitN(desc, "-", 2)
num := parts[0]
pre := ""
if len(parts) > 1 {
pre = parts[1]
}
parts = strings.Split(num, ".")
if len(parts) != 3 {
return Version{}, fmt.Errorf("expected three parts in version number, got %s", num)
}
maj, err := strconv.Atoi(parts[0])
if err != nil {
return Version{}, fmt.Errorf("failed to parse major version %q", parts[0])
}
min, err := strconv.Atoi(parts[1])
if err != nil {
return Version{}, fmt.Errorf("failed to parse minor version %q", parts[1])
}
pat, err := strconv.Atoi(parts[2])
if err != nil {
return Version{}, fmt.Errorf("failed to parse patch version %q", parts[2])
}
return Version{
Major: maj,
Minor: min,
Patch: pat,
Pre: pre,
}, nil
}
func GetCurrent() (Version, error) {
commit, err := git("rev-parse", "HEAD")
if err != nil {
return Version{}, fmt.Errorf("git rev-parse HEAD failed: %w", err)
}
desc, err := git("describe", "--dirty")
if err != nil {
return Version{}, fmt.Errorf("git describe --dirty failed: %w", err)
}
v, err := Parse(desc)
if err != nil {
return Version{}, fmt.Errorf("failed to parse version from describe: %w", err)
}
v.Commit = commit
return v, nil
}
func GetFromRev(rev string) (Version, error) {
commit, err := git("rev-parse", rev)
if err != nil {
return Version{}, fmt.Errorf("git rev-parse %s failed: %w", rev, err)
}
desc, err := git("describe", commit)
if err != nil {
return Version{}, fmt.Errorf("git describe %s failed: %w", commit, err)
}
v, err := Parse(desc)
if err != nil {
return Version{}, fmt.Errorf("failed to parse version from describe: %w", err)
}
v.Commit = commit
return v, nil
}
func (v Version) String() string {
vStr := v.StringWithoutPre()
if v.Pre != "" {
vStr = fmt.Sprintf("%s-%s", vStr, v.Pre)
}
return vStr
}
func (v Version) StringWithoutPre() string {
return fmt.Sprintf("%d.%d.%d", v.Major, v.Minor, v.Patch)
}
func (v Version) RPMRelease() string {
if v.Pre == "" {
return "1"
}
return strings.Split(v.Pre, "-")[0]
}
func (v Version) IsStable() bool {
return v.Pre == ""
}
func git(args ...string) (string, error) {
cmd := exec.Command("git", args...)
out, err := cmd.Output()
if err != nil {
if exerr, ok := err.(*exec.ExitError); ok {
err = fmt.Errorf("ExitError: %v. Stderr: %q", err, string(exerr.Stderr))
}
}
return strings.TrimSpace(string(out)), err
}