Casey Ransom c3f28aed94 make-disk-image: Reduce forking ...

The disk image calculator was using find + exec forking du for every
file in the disk image, making it very slow. Change du to accept files,
nul delimeted on stdin to speed it back up.

Before change:
nix-build nixos/tests/image-contents.nix  9.71s user 1.06s system 8% cpu 2:13.11 total

After change:
nix-build nixos/tests/image-contents.nix  9.93s user 1.23s system 21% cpu 51.601 total

2021-06-21 22:58:07 -04:00

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