The \r is an invisible return character, commonly returned by an echo.
However, here, we are executing grub_probe --target=device /boot
The code in 10_linux_zfs:
initrd_device=$(${grub_probe} --target=device "${boot_dir}")
The results are the same as above. For the specific entry, it is the first
drive in my mirror:
/dev/sdc1 (first drive as defined in my mirror)
/dev/sda1 (second drive as defined in my mirror)
/dev/nvme0n1p2 (zfs logs)
/dev/nvme0n1p4 (zfs cache)
Notice that the results of the output from grub_probe has new lines.
New lines are usually \n but may be \r\n. I don't know what grub_probe
is doing and didn't look to see how it does it. But the return from
there would be what's got the \r (again it isn't visible).
I have nothing special or different from the stock Ubuntu
/etc/default/grub other than I added zswap entries to the
/etc/default/grub and those don't affect this.
The underlying cause may be that because I have a mirrored root using
zfs mirroring, multiple devices show up and may cause the \r to be
returned. It's just a guess.
So, to test, you'd want grub_probe to return multiple devices and the
easiest way would be to just have a mirror for the rpool.
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https://bugs.launchpad.net/bugs/1848856
Title:
Upgrade from 19.04 to 19.10 with zfs on root fails with grub syntax
error
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