support an overridden "cmd" for CGIs

1 files changed, 10 insertions, 12 deletions

diff --git a/contrib/cgi/cgi.go b/contrib/cgi/cgi.go
index 48af04a..b7dd14a 100644
--- a/contrib/cgi/cgi.go
+++ b/contrib/cgi/cgi.go
@@ -11,6 +11,7 @@ import (
 	"net"
 	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 
 	sr "tildegit.org/tjp/sliderule"
@@ -88,16 +89,9 @@ func RunCGI(
 	request *sr.Request,
 	executable string,
 	pathInfo string,
+	workdir string,
 	stderr io.Writer,
 ) (*bytes.Buffer, int, error) {
-	pathSegments := strings.Split(executable, "/")
-
-	dirPath := "."
-	if len(pathSegments) > 1 {
-		dirPath = strings.Join(pathSegments[:len(pathSegments)-1], "/")
-	}
-	basename := pathSegments[len(pathSegments)-1]
-
 	infoLen := len(pathInfo)
 	if pathInfo == "/" {
 		infoLen = 0
@@ -106,9 +100,14 @@ func RunCGI(
 	scriptName := request.Path[:len(request.Path)-infoLen]
 	scriptName = strings.TrimSuffix(scriptName, "/")
 
-	cmd := exec.CommandContext(ctx, "./"+basename)
+	execpath, err := filepath.Abs(executable)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	cmd := exec.CommandContext(ctx, execpath)
 	cmd.Env = prepareCGIEnv(ctx, request, scriptName, pathInfo)
-	cmd.Dir = dirPath
+	cmd.Dir = workdir
 
 	if body, ok := request.Meta.(io.Reader); ok {
 		cmd.Stdin = body
@@ -117,8 +116,7 @@ func RunCGI(
 	cmd.Stdout = responseBuffer
 	cmd.Stderr = stderr
 
-	err := cmd.Run()
-	if err != nil {
+	if err := cmd.Run(); err != nil {
 		var exErr *exec.ExitError
 		if errors.As(err, &exErr) {
 			return responseBuffer, exErr.ExitCode(), nil