From 9ca26e5b477bad085637a6d25b69ad5ccacb1d9e Mon Sep 17 00:00:00 2001
From: Mark Pizzolato <mark@infocomm.com>
Date: Sat, 11 Jun 2022 21:30:56 -0700
Subject: [PATCH] DISK: Read Only open while gathering details for DISKINFO
 command

---
 sim_disk.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sim_disk.c b/sim_disk.c
index d19cf034..3024f083 100644
--- a/sim_disk.c
+++ b/sim_disk.c
@@ -2935,7 +2935,7 @@ if ((DK_GET_FMT (uptr) == DKUF_F_VHD) || (ctx->footer)) {
         container_dtype = (char *)ctx->footer->DriveType;
         }
     if (dtype) {
-        char cmd[32];
+        char cmd[64];
         t_stat r = SCPE_OK;
 
         if ((strcmp (container_dtype, dtype) == 0) ||
@@ -6653,7 +6653,7 @@ if (info->flag == 0) {
     container = sim_vhd_disk_open (FullPath, "r");
     if (container == NULL) {
         sim_disk_set_fmt (uptr, 0, "SIMH", NULL);
-        container = sim_fopen (FullPath, "rb+");
+        container = sim_fopen (FullPath, "rb");
         close_function = fclose;
         size_function = sim_fsize_ex;
         }
@@ -6665,7 +6665,7 @@ if (info->flag == 0) {
         container_size = size_function (container);
         uptr->filename = strdup (FullPath);
         uptr->fileref = container;
-        uptr->flags |= UNIT_ATT;
+        uptr->flags |= UNIT_ATT | UNIT_RO;
         get_disk_footer (uptr);
         f = ctx->footer;
         if (f) {