pcocc alloc --user-data + a directory (instead of a cloud-init config file) makes my terminal hang #17

Hi,

While trying to allocate a job interactively, I messed up and gave pcocc alloc's --user-data a directory instead of a cloud-init config file:

$ pcocc alloc -p partition --user-data path/to/dir template
salloc: Granted job allocation 123456789
Configuring hosts... (done)                     
$ VM execution error: unable to generate cloud-init iso: [Errno 21] Is a directory: 'path/to/dir'
srun: error: node123: task 0: Exited with exit code 255
The cluster terminated unexpectedly

Nothing to be surprised of, except for the fact that I never get a a hold of my session back...

I tracked the problem down to a line in my .bashrc that essentially does:

trap -- "rm -f '$(mktemp)'" EXIT

Note that the rm -f ... part is actually important, I tried replacing it with a no-op trap (trap -- ':' EXIT) and failed to reproduce.