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Introduce "create_grace_time" option #26

Merged
merged 2 commits into from
Oct 6, 2022
Merged

Introduce "create_grace_time" option #26

merged 2 commits into from
Oct 6, 2022

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edigaryev
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Problem: when invoking "tart run" straight after "tart create", the former may display a black screen. The culprit seems to be the Virtualization.Framework, which still doesn't close the VM's files for some time after the Tart terminates:

% tart create --from-ipsw=latest vm ; lsof ~/.tart/vms/vm/disk.img ~/.tart/vms/vm/nvram.bin
Using cached *.ipsw file...
Installing OS...
100%
COMMAND    PID USER   FD   TYPE DEVICE    SIZE/OFF     NODE NAME
com.apple 9830  edi    3u   REG   1,16    33570816 11748431 /Users/edi/.tart/vms/vm/nvram.bin
com.apple 9830  edi    4u   REG   1,16 50000000000 11748432 /Users/edi/.tart/vms/vm/disk.img

Solution: introduce an option that if specified, will force the Packer plugin to wait for the specified time after "tart create" finishes.

@@ -34,6 +35,13 @@ func (s *stepCreateVM) Run(ctx context.Context, state multistep.StateBag) multis
return multistep.ActionHalt
}

if config.CreateGraceTime != 0 {
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Should we always wait if that seems the case? Why we need to configure it? Or maybe set some default timeout?

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I don't think there's a golden value that we can hardcode for this racy situation. Some people might want it as short as possible, some might want it to be rather large to be on the safe side.

I'd suggest we leave as for now and see how well it works out in https://github.com/cirruslabs/macos-image-templates.

@edigaryev edigaryev merged commit d018787 into main Oct 6, 2022
@edigaryev edigaryev deleted the create-grace-time branch October 6, 2022 13:41
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2 participants