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package main
import (
"fmt"
"os"
"os/exec"
"strings"
"text/template"
)
func syscmd(name string, arg ...string) string {
cmd := exec.Command(name, arg...)
out, err := cmd.CombinedOutput()
if err != nil {
fmt.Println(string(out))
panic(err)
}
splitted := strings.Split(string(out), "\n")
lines := make([]string, 0, len(splitted))
for _, l := range splitted {
l = strings.TrimSpace(l)
if l == "" {
continue
}
lines = append(lines, l)
}
if len(lines) != 1 {
fmt.Println(string(out))
panic("Expects a single line")
}
return lines[0]
}
func getVersionTag(tags string) string {
var candidates []string
for _, t := range strings.Split(tags, " ") {
if strings.HasPrefix(t, "v") {
candidates = append(candidates, t)
}
}
if len(candidates) == 0 {
return ""
}
return candidates[0]
}
var outTemplate = template.Must(template.New("").Parse(`package {{ .package }}
var Version = "{{ .version }}"
var HgSha = "{{ .sha }}"
var Build = "{{ .build }}"
`))
func main() {
sha := syscmd("hg", "id", "--id")
curVersion := getVersionTag(syscmd("hg", "id", "--tags"))
lastVersion := getVersionTag(syscmd("hg", "id", "--tags", "-r", "limit(last(ancestors(.)&tag('re:v.*'))|.,1)"))
modified := strings.HasSuffix(sha, "+")
jobID := os.Getenv("CI_JOB_ID")
var version string
switch {
case modified && lastVersion != "":
version = lastVersion + ""
case curVersion != "":
version = curVersion
case lastVersion != "":
version = lastVersion + "-" + sha
default:
version = "v0.0.0-" + sha
}
vars := map[string]string{
"package": "main",
"sha": sha,
"version": version,
"build": jobID,
}
out, err := os.Create("version.go")
if err != nil {
panic(err)
}
if err := outTemplate.Execute(out, vars); err != nil {
panic(err)
}
}