[Bug 1651818] Re: busybox-initramfs needs different compile options to work with cryptroot-unlock

[Trent Nelson]

I took a crack at patching this.  Works without complaints for
cryptroot-unlock as shipped with Ubuntu 18.04 Server.

Apply with:
$ cd /usr/share/cryptsetup/initramfs/bin/
$ sudo patch -bp1 < /path/to/cryptroot-unlock-neutered-busybox-progs.patch
$ sudo update-initramfs -uk all

Problems were:
1) Busybox `ps` takes no (useful) args.
2) Busybox `grep` does not accept -z (NULL terminated line handling).
3) Busybox has no `usleep`, it DOES have a `sleep` that accepts fractional seconds.

** Patch added: "Fix cryptroot-unlock for neutered Busybox env"
   https://bugs.launchpad.net/ubuntu/+source/busybox/+bug/1651818/+attachment/5151893/+files/cryptroot-unlock-neutered-busybox-progs.patch

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https://bugs.launchpad.net/bugs/1651818

Title:
  busybox-initramfs needs different compile options to work with
  cryptroot-unlock

Status in busybox package in Ubuntu:
  Confirmed
Status in cryptsetup package in Ubuntu:
  Confirmed

Bug description:
  The cryptroot-unlock script in the cryptsetup package does not work in initramfs.
  It fails because "ps -e" is not available in busybox for initramfs.
  When building the package with

  CONFIG_DESKTOP=y
  CONFIG_EXTRA_COMPAT=y

  the needed commands (ps, grep) with parameter are there and it works.
  Tetsted on Ubuntu GNOME 16.10.

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