96e481bfbd
This makes vmspawn work when /usr/share/qemu/edk2-i386-vars.fd is on disk with 0444 permissions as is the case on NixOS. The nix package manager does not store any access permissions, ownership, timestamps, or extended attributes in its package format to increase reproducibility. The only meta-data that is stored is the executable bit. Thus when unpacking a nix package, the executable bit is preserved, but no other access permissions are preserved and all files in /nix/store end up as read-only. This causes the template OVMF vars file to have 0444 permissions. If we preserve those permissions when copying the template file to /tmp that means QEMU can not write to the file and fails. So lets not preserve permissions and keep the 0600 permissions that are set by default.
System and Service Manager
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