1 files changed, 61 insertions, 0 deletions
diff --git a/src/cmd/go/internal/vcweb/fossil.go b/src/cmd/go/internal/vcweb/fossil.go
new file mode 100644
index 0000000..cc24f2f
--- /dev/null
+++ b/src/cmd/go/internal/vcweb/fossil.go
@@ -0,0 +1,61 @@
+// 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 (
+	"fmt"
+	"log"
+	"net/http"
+	"net/http/cgi"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sync"
+)
+
+type fossilHandler struct {
+	once          sync.Once
+	fossilPath    string
+	fossilPathErr error
+}
+
+func (h *fossilHandler) Available() bool {
+	h.once.Do(func() {
+		h.fossilPath, h.fossilPathErr = exec.LookPath("fossil")
+	})
+	return h.fossilPathErr == nil
+}
+
+func (h *fossilHandler) Handler(dir string, env []string, logger *log.Logger) (http.Handler, error) {
+	if !h.Available() {
+		return nil, ServerNotInstalledError{name: "fossil"}
+	}
+
+	name := filepath.Base(dir)
+	db := filepath.Join(dir, name+".fossil")
+
+	cgiPath := db + ".cgi"
+	cgiScript := fmt.Sprintf("#!%s\nrepository: %s\n", h.fossilPath, db)
+	if err := os.WriteFile(cgiPath, []byte(cgiScript), 0755); err != nil {
+		return nil, err
+	}
+
+	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if _, err := os.Stat(db); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		ch := &cgi.Handler{
+			Env:    env,
+			Logger: logger,
+			Path:   h.fossilPath,
+			Args:   []string{cgiPath},
+			Dir:    dir,
+		}
+		ch.ServeHTTP(w, req)
+	})
+
+	return handler, nil
+}