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package router
import (
"fmt"
"io"
"net/http"
"os"
"os/exec"
"syscall"
"gitlab.com/gitlab-org/gitaly/helper"
"github.com/gorilla/mux"
)
const (
gitalyRepoPathHeader = "Gitaly-Repo-Path"
gitlabIdHeader = "Gitaly-GL-Id"
)
func GetInfoRefs(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
rpc := vars["service"]
glId := r.Header.Get(gitlabIdHeader)
if glId == "" {
helper.Fail500(w, r, fmt.Errorf("GetInfoRefs: %s header was not found", gitlabIdHeader))
return
}
repoPath := r.Header.Get(gitalyRepoPathHeader)
if repoPath == "" {
helper.Fail500(w, r, fmt.Errorf("GetInfoRefs: %s header was not found", gitalyRepoPathHeader))
return
}
// Prepare our Git subprocess
cmd := gitCommand(glId, "git", rpc, "--stateless-rpc", "--advertise-refs", repoPath)
stdout, err := cmd.StdoutPipe()
if err != nil {
helper.Fail500(w, r, fmt.Errorf("GetInfoRefs: stdout: %v", err))
return
}
defer stdout.Close()
if err := cmd.Start(); err != nil {
helper.Fail500(w, r, fmt.Errorf("GetInfoRefs: start %v: %v", cmd.Args, err))
return
}
defer helper.CleanUpProcessGroup(cmd) // Ensure brute force subprocess clean-up
// Start writing the response
w.Header().Set("Content-Type", fmt.Sprintf("application/x-git-%s-advertisement", rpc))
w.Header().Set("Cache-Control", "no-cache")
w.WriteHeader(200) // Don't bother with HTTP 500 from this point on, just return
if err := pktLine(w, fmt.Sprintf("# service=git-%s\n", rpc)); err != nil {
helper.LogError(r, fmt.Errorf("GetInfoRefs: pktLine: %v", err))
return
}
if err := pktFlush(w); err != nil {
helper.LogError(r, fmt.Errorf("GetInfoRefs: pktFlush: %v", err))
return
}
if _, err := io.Copy(w, stdout); err != nil {
helper.LogError(r, fmt.Errorf("GetInfoRefs: copy output of %v: %v", cmd.Args, err))
return
}
if err := cmd.Wait(); err != nil {
helper.LogError(r, fmt.Errorf("GetInfoRefs: wait for %v: %v", cmd.Args, err))
return
}
}
func gitCommand(glId string, name string, args ...string) *exec.Cmd {
cmd := exec.Command(name, args...)
// Start the command in its own process group (nice for signalling)
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
// Explicitly set the environment for the Git command
cmd.Env = []string{
fmt.Sprintf("HOME=%s", os.Getenv("HOME")),
fmt.Sprintf("PATH=%s", os.Getenv("PATH")),
fmt.Sprintf("LD_LIBRARY_PATH=%s", os.Getenv("LD_LIBRARY_PATH")),
fmt.Sprintf("GL_ID=%s", glId),
fmt.Sprintf("GL_PROTOCOL=http"),
}
// If we don't do something with cmd.Stderr, Git errors will be lost
cmd.Stderr = os.Stderr
return cmd
}
func pktLine(w io.Writer, s string) error {
_, err := fmt.Fprintf(w, "%04x%s", len(s)+4, s)
return err
}
func pktFlush(w io.Writer) error {
_, err := fmt.Fprint(w, "0000")
return err
}
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