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build-version.go
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build-version.go
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package main
import (
"fmt"
"os/exec"
"strings"
"github.com/blang/semver"
)
func getTag(match ...string) (string, *semver.PRVersion) {
args := append([]string{
"describe", "--tags",
}, match...)
if tag, err := exec.Command("git", args...).Output(); err != nil {
return "", nil
} else {
tagParts := strings.Split(string(tag), "-")
if len(tagParts) == 3 {
if ahead, err := semver.NewPRVersion(tagParts[1]); err == nil {
return tagParts[0], &ahead
}
}
return tagParts[0], nil
}
}
func main() {
// Find the last vX.X.X Tag and get how many builds we are ahead of it.
versionStr, ahead := getTag("--match", "v*")
version, err := semver.ParseTolerant(versionStr)
if err != nil {
// no version tag found so just return what ever we can find.
fmt.Println("0.0.0-unknown")
return
}
// Get the tag of the current revision.
tag, _ := getTag("--exact-match")
if tag == versionStr {
// Seems that we are going to build a release.
// So the version number should already be correct.
fmt.Println(version.String())
return
}
// If we don't have any tag assume "dev"
if tag == "" {
tag = "dev"
}
// Get the most likely next version:
version.Patch = version.Patch + 1
if pr, err := semver.NewPRVersion(tag); err == nil {
// append the tag as pre-release name
version.Pre = append(version.Pre, pr)
}
if ahead != nil {
// if we know how many commits we are ahead of the last release, append that too.
version.Pre = append(version.Pre, *ahead)
}
fmt.Println(version.String())
}