grub-mkconfig grub 1:2.02.beta2-6

[dragonchild]

version: grub 1:2.02.beta2-6
Distro: Arch
setup: default

system: x86_64-efi
system layout:
hd0,gpt1  EFI Fat32 mounted /boot   (NOT /boot/efi)
grub directory: /boot/grub          (on the EFI partition)              

hd0,gpt5  /   ext4 Arch distro
              /linuz-warp, /initramfs-warp in the root directory (warp
              is just an id for this setup

hd0,gpt7  /    ext4 Arch distro
             /linuz-arch, /initramfs-arch in the root directory (arch
              is just an id for this setup

Problem generation:
        with (hd0,gpt7) mounted as root: 
        run: grub-mkconfig -o /boot/grub.cfg

produces: (edited)
 menuentry 'Arch Linux' --class arch .... ;this is hd0,gpt7, /dev/sda7
        linux   /vmlinuz-arch
                root=UUID=bb79802f-749e-4fa2-8135-80a7ef9f98dc


 menuentry 'Arch (on /dev/sda5)' --class .... ;discovered by prober
        linux /vmlinuz-warp root=/dev/sda5
        
Problem: the second entry is using /dev/sdX notation instead of UUID

This fails when grub-mkconfig is run directly from a usb stick or
chrooted into (hd7,gpt)/. The /dev/sdX may not be set
correctly which will render the partition unbootable.

happy hunting,
jan