[glib/mcatanzaro/posix-spawn2: 8/10] gspawn: add new error message for open() failures

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 954884c5ca05570d38a6a8d5535209d70c83be1a
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Tue Dec 14 13:36:30 2021 -0600

    gspawn: add new error message for open() failures
    
    Reporting these as dup2() failures is bogus.

 glib/gspawn.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)
---
diff --git a/glib/gspawn.c b/glib/gspawn.c
index 53ee2f3b8..0ecfd8c2e 100644
--- a/glib/gspawn.c
+++ b/glib/gspawn.c
@@ -1620,6 +1620,7 @@ enum
 {
   CHILD_CHDIR_FAILED,
   CHILD_EXEC_FAILED,
+  CHILD_OPEN_FAILED,
   CHILD_DUP2_FAILED,
   CHILD_FORK_FAILED
 };
@@ -1674,7 +1675,7 @@ do_exec (gint                  child_err_report_fd,
       gint read_null = safe_open ("/dev/null", O_RDONLY);
       if (read_null < 0)
         write_err_and_exit (child_err_report_fd,
-                            CHILD_DUP2_FAILED);
+                            CHILD_OPEN_FAILED);
       if (safe_dup2 (read_null, 0) < 0)
         write_err_and_exit (child_err_report_fd,
                             CHILD_DUP2_FAILED);
@@ -1696,7 +1697,7 @@ do_exec (gint                  child_err_report_fd,
       gint write_null = safe_open ("/dev/null", O_WRONLY);
       if (write_null < 0)
         write_err_and_exit (child_err_report_fd,
-                            CHILD_DUP2_FAILED);
+                            CHILD_OPEN_FAILED);
       if (safe_dup2 (write_null, 1) < 0)
         write_err_and_exit (child_err_report_fd,
                             CHILD_DUP2_FAILED);
@@ -1718,7 +1719,7 @@ do_exec (gint                  child_err_report_fd,
       gint write_null = safe_open ("/dev/null", O_WRONLY);
       if (write_null < 0)
         write_err_and_exit (child_err_report_fd,
-                            CHILD_DUP2_FAILED);
+                            CHILD_OPEN_FAILED);
       if (safe_dup2 (write_null, 2) < 0)
         write_err_and_exit (child_err_report_fd,
                             CHILD_DUP2_FAILED);
@@ -2514,7 +2515,15 @@ fork_exec (gboolean              intermediate_child,
                            g_strerror (buf[1]));
 
               break;
-              
+
+            case CHILD_OPEN_FAILED:
+              g_set_error (error,
+                           G_SPAWN_ERROR,
+                           G_SPAWN_ERROR_FAILED,
+                           _("Failed to open file to remap file descriptor (%s)"),
+                           g_strerror (buf[1]));
+              break;
+
             case CHILD_DUP2_FAILED:
               g_set_error (error,
                            G_SPAWN_ERROR,