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|
package main
import (
"os"
"os/exec"
"bytes"
)
var prog [string]string
func init() {
var err error
for _, p := range []string{"git", "makepkg"} {
prog[p], err = exec.LookPath("git")
if err != nil {
panic(err)
}
}
}
func pipeline(cmds ...*exec.Cmd) err error {
for i, cmd := range cmds[:len(cmds)-1] {
cmds[i+1].Stdin, err = cmd.StdoutPipe()
if err != nil {
return
}
}
stderr := make([]bytes.Buffer, len(cmds))
for i, cmd := range cmds {
cmd.Stderr = &stderr[i]
if err = cmd.Start(); err != nil {
break
}
}
for i, cmd := range cmds {
if cmd.Process == nil {
continue
}
if _err := cmd.Wait(); _err != nil {
if ee, ok := _err.(*exec.ExitError); ok {
ee.Stderr = stderr[i].Bytes()
}
if err != nil {
err = _err
}
}
}
return
}
func pkgbuild2srcinfo(pkgbuildId string) (string, error) {
cachefilename := "filter/pkgbuild2srcinfo/"+pkgbuildId
for {
b, err := ioutil.ReadFile(cachefilename)
if err == nil && len(bytes.TrimSpace(b)) == 40 {
return bytes.TrimSpace(b).String(), nil
}
file, err := os.OpenFile("filter/tmp/PKGBUILD", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return "", err
}
err = pipeline(
&exec.Cmd{
Path: prog["git"], Args: ["git", "cat-file", "blob", pkgbuildId],
Stdout: file,
})
file.Close()
if err != nil {
return "", err
}
file, err = os.OpenFile(cachefilename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
err = pipeline(
&exec.Cmd{
Path: prog["makepkg"], Args: ["makepkg", "--printsrcinfo"],
Dir: "filter/tmp"
},
&exec.Cmd{
Path: prog["git"], Args: ["git", "hash-object", "-t", "blob", "-w", "--stdin", "--no-filters"],
Stdout: &buf,
})
file.Close()
if err != nil {
return "", err
}
}
}
func filter(fromPfix string, toPfix string) {
exec.Cmd{
Path: prog["git"], Args: ["git", "fast-export",
"--use-done-feature",
"--no-data",
"--", fromPfix + "/master"],
}
}
|
