[systemd-devel] Preserve all active encrypted device when shutting down into initramfs

[Ivan Kabaivanov]

Hi,
I'm running LFS (Linux From Scratch) with systemd-230, compiled from source.  I have three LUKS-encrypted devices:
/dev/mapper/swap/dev/mapper/root/dev/mapper/home
I want to drop into initramfs and do some maintenance work, for which I require all three of these encrypted devices to remain active.
I create /run/initramfs with a populated and working initramfs.  I create /run/initramfs/shutdown with permissions 0755 and the following content:
#/bin/shexec busybox sh
When I issue the shutdown command I get dropped into the initramfs and I get the busybox shell.  Howerver, only /dev/mapper/root (my / ) remains active.  /dev/mapper/swap and /dev/mapper/home point to non-existent /dev/dm-* block devices.
Manually trying cryptsetup open /dev/sdaN label just hangs without activating the device.
I'm guessing systemd goes on a killing spree and kills all the crypt processes, except the ones associated with / (/oldroot in the initramfs).
Is there a way to tell systemd to keep the encrypted devices active, even if it unmounts their filesystems?
Thanks,IvanK.
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