Sorry, it should not be a bug, but a misleading option.
According to the official virtualization guide:
http://doc.ubuntu.com/ubuntu/serverguide/C/jeos-and-vmbuilder.html
"the -o tells vmbuilder to overwrite the previous version of the VM"
The users should suppose to overwrite ONLY the VM.
But the manpages of vmbuilder tells
" -o, --overwrite
Force overwrite of destination directory if it already exist.
[default: False]"
It will delete the whole directory which may contains many VMs.
Is it too dangerous?
Will it make more sense if the "-o" option only overwrite the VM with the same
"--hostname"?
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https://bugs.launchpad.net/bugs/1090223
Title:
The directory ubuntu-kvm disappeared after creating vms failed
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