I haven't had a chance to write and test the zpool.cache copying. I keep
meaning to get to it every day, but pushing it back for lack of time.

The zfs-initramfs script in 16.04 (always) and in 18.04 (by default)
runs a plain `zpool import`.

ZoL 0.7.5 has a default search order for imports that prefers /dev/disk/by-id:
https://github.com/zfsonlinux/zfs/blob/zfs-0.7.5/lib/libzfs/libzfs_import.c#L1835

That said, so did ZoL on Xenial (0.6.5.6).

On my bionic test VM, non-root pools import using whatever name I
created them with. If I use /dev, they import later with /dev. If I use
/dev/disk/by-id, they import later with /dev/disk/by-id. This is true
immediately, and true across reboots.

Root pools seem to behave the same way. My root pool was created using
/dev/disk/by-id per the HOWTO (which I maintain) and is being imported
with /dev/disk/by-id. This is with no zpool.cache, either on the live
system or in the initramfs (which I unpacked to verify).

In other words, I cannot reproduce this on bionic. I'm pretty confident
this is an issue on Xenial, though I haven't re-tested just now to
absolutely confirm. But I will say that on my Xenial laptop at the
moment, my root pool is imported with a /dev name.

In short, I think this is fixed in Bionic, but I'm not 100% sure which
code changed to fix it.

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https://bugs.launchpad.net/bugs/1688890

Title:
  initramfs-zfs should support misc /dev dirs

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