Hello,
When does a grub2 loopback need to know the partition that contains the
file?
Consider the following grub2 menu entry:
menuentry "SliTaz Rolling 20181204" {
set isofile="/home/[USER]/slitaz-rolling.iso"
loopback loop $isofile
linux (loop)/boot/bzImage lang=en kmap=us autologin isofrom=$isofile
boot=live noeject noprompt root=/dev/null
initrd (loop)/boot/rootfs4.gz (loop)/boot/rootfs3.gz
(loop)/boot/rootfs2.gz (loop)/boot/rootfs1.gz
}
Sometimes the above entry will work, but other times I need to specify the
disk and partition that contain the `.iso` file. For example, sometimes I
need to change the `set isofile` line to something like the following:
set isofile="(hd0,gpt4)/home/[USER]/slitaz-rolling.iso"
When is it required to specify the disk and partition? Are there some
situations where grub will scan multiple disks and partitions? Or is there
just one "default" disk+partition, and any other partition will need to be
manually specified? Is this behavior documented somewhere?
Some possibly relevant factors: Filesystem (specifically, btrfs vs
ext2/3/4). Whether the partition is the "root" partition.
For reference:
https://www.gnu.org/software/grub/manual/grub/grub.html#loopback
Thanks in advance!
Parke
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