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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package vcweb
import (
"log"
"net/http"
"net/http/cgi"
"os/exec"
"runtime"
"slices"
"sync"
)
type gitHandler struct {
once sync.Once
gitPath string
gitPathErr error
}
func (h *gitHandler) Available() bool {
if runtime.GOOS == "plan9" {
// The Git command is usually not the real Git on Plan 9.
// See https://golang.org/issues/29640.
return false
}
h.once.Do(func() {
h.gitPath, h.gitPathErr = exec.LookPath("git")
})
return h.gitPathErr == nil
}
func (h *gitHandler) Handler(dir string, env []string, logger *log.Logger) (http.Handler, error) {
if !h.Available() {
return nil, ServerNotInstalledError{name: "git"}
}
baseEnv := append(slices.Clip(env),
"GIT_PROJECT_ROOT="+dir,
"GIT_HTTP_EXPORT_ALL=1",
)
handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
// The Git client sends the requested Git protocol version as a
// "Git-Protocol" HTTP request header, which the CGI host then converts
// to an environment variable (HTTP_GIT_PROTOCOL).
//
// However, versions of Git older that 2.34.0 don't recognize the
// HTTP_GIT_PROTOCOL variable, and instead need that value to be set in the
// GIT_PROTOCOL variable. We do so here so that vcweb can work reliably
// with older Git releases. (As of the time of writing, the Go project's
// builders were on Git version 2.30.2.)
env := slices.Clip(baseEnv)
if p := req.Header.Get("Git-Protocol"); p != "" {
env = append(env, "GIT_PROTOCOL="+p)
}
h := &cgi.Handler{
Path: h.gitPath,
Logger: logger,
Args: []string{"http-backend"},
Dir: dir,
Env: env,
}
h.ServeHTTP(w, req)
})
return handler, nil
}