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Add code to use VirtualBox differencing images #3

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Merged
computezrmle merged 1 commit into from
Jan 13, 2022
Merged

Add code to use VirtualBox differencing images #3

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74 changes: 64 additions & 10 deletions samples/vboxwrapper/vbox_vboxmanage.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -500,18 +500,72 @@ namespace vboxmanage {

// Adding virtual hard drive to VM
//
vboxlog_msg("Adding virtual disk drive to VM. (%s)", image_filename.c_str());
string command_fix_part;

command_fix_part = "storageattach \"" + vm_name + "\" ";
command_fix_part += "--storagectl \"Hard Disk Controller\" ";
command_fix_part += "--port 0 ";
command_fix_part += "--device 0 ";
command_fix_part += "--type hdd ";

if (!multiattach_vdi_file.size()) {
// the traditional method:
// copy the vdi file from the projects dir to the slots dir and rename it vm_image.vdi
// each copy must get a new (random) UUID
//
vboxlog_msg("Adding virtual disk drive to VM. (%s)", image_filename.c_str());
command = command_fix_part;
command += "--setuuid \"\" ";
command += "--medium \"" + virtual_machine_slot_directory + "/" + image_filename + "\" ";

command = "storageattach \"" + vm_name + "\" ";
command += "--storagectl \"Hard Disk Controller\" ";
command += "--port 0 ";
command += "--device 0 ";
command += "--type hdd ";
command += "--setuuid \"\" ";
command += "--medium \"" + virtual_machine_slot_directory + "/" + image_filename + "\" ";
retval = vbm_popen(command, output, "storage attach (fixed disk)");
if (retval) return retval;
} else {
// Use MultiAttach mode and differencing images
// See: https://www.virtualbox.org/manual/ch05.html#hdimagewrites
// https://www.virtualbox.org/manual/ch05.html#diffimages
// the vdi file downloaded to the projects dir becomes the parent (read only)
// "--setuid" must not be used
// each task gets it's own differencing image (writable)
// differencing images are written to the VM's snapshot folder
//
string medium_file = aid.project_dir;
medium_file += "/" + multiattach_vdi_file;

vboxlog_msg("Adding virtual disk drive to VM. (%s)", multiattach_vdi_file.c_str());
command = "list hdds";

retval = vbm_popen(command, output, "check if parent hdd is registered", false, false);
if (retval) return retval;

if (output.find(medium_file) == string::npos) {
// parent hdd is not registered
// vdi files can't be registered and set to multiattach mode within 1 step.
// They must first be attached to a VM in normal mode, then detached from the VM
//
command = command_fix_part;
command += "--medium \"" + medium_file + "\" ";

retval = vbm_popen(command, output, "register parent hdd", false, false);
if (retval) return retval;

command = command_fix_part;
command += "--medium none ";

retval = vbm_popen(command, output, "detach parent vdi", false, false);
if (retval) return retval;
// the vdi file is now registered and ready to be attached in multiattach mode
//
}

command = command_fix_part;
command += "--mtype multiattach ";
command += "--medium \"" + medium_file + "\" ";

retval = vbm_popen(command, output, "storage attach (fixed disk - multiattach mode)");
if (retval) return retval;
}

retval = vbm_popen(command, output, "storage attach (fixed disk)");
if (retval) return retval;

// Add guest additions to the VM
//
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