[XS8] Enhance tracing to hunt for restore bug #157
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The particular issue turned out to be that the nested UEFI host being restored had several disks attached. Since this is done as NVMe namespaces of a single disk, all sharing the same ID, udev in dom0 does not have enough info and messes up /dev/disk/by-id/ on which restore relies because of /etc/xensource-inventory: lrwxrwxrwx 1 root root 13 Jul 15 14:28 nvme-QEMU_NVMe_Ctrl_nvme0 -> ../../nvme0n3 lrwxrwxrwx 1 root root 15 Jul 15 14:28 nvme-QEMU_NVMe_Ctrl_nvme0-part1 -> ../../nvme0n2p1 lrwxrwxrwx 1 root root 15 Jul 15 14:28 nvme-QEMU_NVMe_Ctrl_nvme0-part2 -> ../../nvme0n1p2 Only the addition of the `tool.dump()` call allowed me to connect the "Failed to create root filesystem" error with that longstanding (in)famous issue, but a few other additions were useful to get there. Signed-off-by: Yann Dirson <yann.dirson@vates.tech> (cherry picked from commit 02d72e6, with one additional safety guard that does not apply to master any more)
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This is a "backport" of #155 to XS8, with one additional safety guard that does not apply to master any more (or more exactly, this is the original work on xs8 that let to the master PR)