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Hi all, I'm transferring my previous GRUB system to a larger disk where I want to make everything into btrfs subvolumes. However I can't get GRUB to work with btrfs subvolumes.
Since this system was already installed, I rsynced everything to the appropriate subvolumes. I skipped to the mounting my old system step and installing GRUB step from the installation guide.
I have a btrfs partition known as /dev/sdb3. Inside I have two subvolumes, one as /root which will be '/', and /home which is self explanatory. My /dev/sdb1 partition is an EFI/ESP partition that's fat32. How do I install and get grub working on this? I tried this:
mount -t btrfs -o subvol=/root /dev/sdb3 /mnt/root
arch-chroot /mnt/root
mount /dev/sdb1 /efi
grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB
But when I try grub-mkconfig -o /boot/grub/grub.cfg, it says that it failed to connect to lvmetad.
grub-mkconfig gives this: https://ptpb.pw/guet
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-linux
Found initrd image: /boot/intel-ucode.img /boot/initramfs-linux.img
Found fallback initrd image(s) in /boot: initramfs-linux-fallback.img
WARNING: Failed to connect to lvmetad. Falling back to device scanning.
WARNING: Device /dev/loop0 not initialized in udev database even after waiting 10000000 microseconds.
grep: /tmp/os-prober.PMIzFf/raided-map: No such file or directory
grep: /tmp/os-prober.PMIzFf/swaps-map: No such file or directory
grep: /tmp/os-prober.PMIzFf/mounted-map: No such file or directory
grep: /tmp/os-prober.PMIzFf/raided-map: No such file or directory
grep: /tmp/os-prober.PMIzFf/swaps-map: No such file or directory
grep: /tmp/os-prober.PMIzFf/mounted-map: No such file or directory
It will keep going.
So I edited my old grub.cfg and changed the UUID of the disks and added subvol options to mount the subvolumes.
My grub.cfg: https://ptpb.pw/rBbi
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=/root quiet
echo 'Loading initial ramdisk ...'
initrd /boot/intel-ucode.img /boot/initramfs-linux.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=/root quiet
echo 'Loading initial ramdisk ...'
initrd /boot/intel-ucode.img /boot/initramfs-linux.img
}
menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
echo 'Loading Linux linux ...'
linux /boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=/root quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initramfs-linux-fallback.img
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
I already edited my fstab too: https://ptpb.pw/jPS1
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sdb3 /
UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 / btrfs rw,relatime,ssd,space_cache,subvolid=5,discard,autodefrag,subvol=/root 0 0
# /dev/sdb3 /home
UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 /home btrfs rw,relatime,ssd,space_cache,subvolid=5,discard,autodefrag,subvol=/home 0 0
# /dev/sdb2
UUID=42258ce5-52dd-4888-b863-b856c9533c96 none swap defaults,pri=-2 0 0
# /dev/sde1
UUID=2C7A78077A77CC58 /mnt/Memory ntfs-3g defaults 0 0
# /dev/sdd1
UUID=D4ACCAACACCA8886 /mnt/disk3 ntfs-3g defaults 0 0
# /dev/sdc2
UUID=0850FA2D50FA215C /mnt/disk2 ntfs-3g defaults 0 0
# /dev/sdb2
# UUID=A84EEA614EEA2830 /mnt/ssd ntfs-3g defaults 0 0
When I try rebooting into my system, GRUB complains that the linux images can't be found, "vmlinuz-linux".
How do I get btrfs subvolumes to work with GRUB UEFI? I don't know how to set this up properly.
Last edited by Pastah (2018-12-16 14:50:05)
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I got it working by mostly following this steps.
I mounted my efi partition in /boot/efi instead. Generated fstab again, then mkinitcpio -p linux.
Then followed the steps in the link to get UEFI grub-mkconfig working.
https://unix.stackexchange.com/question … n-lvm-disk
Then did grub-install and grub-mkconfig as said above.
Not sure what fixed it. Could be due to my EFI partition not being in fstab, the arch-chroot lvm bug for grub, or what.
EDIT:
If you're interested this is what my files looks like now with the working system.
fstab
# Static information about the filesystems.
# See fstab(5) for details.
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sdb3 LABEL=1TBssd
UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 / btrfs rw,relatime,ssd,space_cache,autodefrag,discard,subvolid=340,subvol=/root,subvol=root 0 0
# /dev/sdb3 LABEL=1TBssd
UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 /home btrfs rw,relatime,ssd,space_cache,autodefrag,discard,subvolid=341,subvol=/home,subvol=home 0 0
# /dev/sdb1
UUID=BC7B-0806 /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 0 2
# /dev/sdb2
UUID=42258ce5-52dd-4888-b863-b856c9533c96 none swap defaults,pri=-2 0 0
# /dev/sde1
UUID=2C7A78077A77CC58 /mnt/Memory ntfs-3g defaults 0 0
# /dev/sdd1
UUID=D4ACCAACACCA8886 /mnt/disk3 ntfs-3g defaults 0 0
# /dev/sdc2
UUID=0850FA2D50FA215C /mnt/disk2 ntfs-3g defaults 0 0
grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod btrfs
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
font="/root/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_input console
terminal_output gfxterm
if [ x$feature_timeout_style = xy ] ; then
set timeout_style=menu
set timeout=5
# Fallback normal timeout code in case the timeout_style feature is
# unavailable.
else
set timeout=5
fi
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
echo 'Loading Linux linux ...'
linux /root/boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=root quiet
echo 'Loading initial ramdisk ...'
initrd /root/boot/intel-ucode.img /root/boot/initramfs-linux.img
}
submenu 'Advanced options for Arch Linux' $menuentry_id_option 'gnulinux-advanced-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
menuentry 'Arch Linux, with Linux linux' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-advanced-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
echo 'Loading Linux linux ...'
linux /root/boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=root quiet
echo 'Loading initial ramdisk ...'
initrd /root/boot/intel-ucode.img /root/boot/initramfs-linux.img
}
menuentry 'Arch Linux, with Linux linux (fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-linux-fallback-c1519a2d-d095-4cfe-965b-6e516c1150a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd1,gpt3'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt3' --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3 c1519a2d-d095-4cfe-965b-6e516c1150a9
else
search --no-floppy --fs-uuid --set=root c1519a2d-d095-4cfe-965b-6e516c1150a9
fi
echo 'Loading Linux linux ...'
linux /root/boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=root quiet
echo 'Loading initial ramdisk ...'
initrd /root/boot/initramfs-linux-fallback.img
}
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Arch Linux (on /dev/sda2)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-0053697c-114d-4b32-b154-7e373b3090b2' {
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 0053697c-114d-4b32-b154-7e373b3090b2
else
search --no-floppy --fs-uuid --set=root 0053697c-114d-4b32-b154-7e373b3090b2
fi
linux /boot/vmlinuz-linux root=UUID=0053697c-114d-4b32-b154-7e373b3090b2 rw quiet
initrd /boot/intel-ucode.img
}
submenu 'Advanced options for Arch Linux (on /dev/sda2)' $menuentry_id_option 'osprober-gnulinux-advanced-0053697c-114d-4b32-b154-7e373b3090b2' {
menuentry 'Arch Linux (on /dev/sda2)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-linux--0053697c-114d-4b32-b154-7e373b3090b2' {
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 0053697c-114d-4b32-b154-7e373b3090b2
else
search --no-floppy --fs-uuid --set=root 0053697c-114d-4b32-b154-7e373b3090b2
fi
linux /boot/vmlinuz-linux root=UUID=0053697c-114d-4b32-b154-7e373b3090b2 rw quiet
initrd /boot/intel-ucode.img
}
menuentry 'Arch Linux, with Linux linux (on /dev/sda2)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-linux--0053697c-114d-4b32-b154-7e373b3090b2' {
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 0053697c-114d-4b32-b154-7e373b3090b2
else
search --no-floppy --fs-uuid --set=root 0053697c-114d-4b32-b154-7e373b3090b2
fi
linux /boot/vmlinuz-linux root=UUID=0053697c-114d-4b32-b154-7e373b3090b2 rw quiet
initrd /boot/intel-ucode.img
}
menuentry 'Arch Linux, with Linux linux (fallback initramfs) (on /dev/sda2)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-linux--0053697c-114d-4b32-b154-7e373b3090b2' {
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//disk@0,gpt2' --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 0053697c-114d-4b32-b154-7e373b3090b2
else
search --no-floppy --fs-uuid --set=root 0053697c-114d-4b32-b154-7e373b3090b2
fi
linux /boot/vmlinuz-linux root=UUID=0053697c-114d-4b32-b154-7e373b3090b2 rw quiet
initrd /boot/initramfs-linux-fallback.img
}
}
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
Last edited by Pastah (2018-12-16 14:58:31)
Offline
It's the lvm bug which manifests via arch-chroot, but I'd hardly call it an "arch-chroot bug" just because lvm is being silly.
Anyway I don't get why grub.cfg is supposed to be so complicated that you need to use some silly script which parses lvm output to figure out where your disk is.
It's pretty dead simple to write a 4-line grub.cfg that does literally everything the huge, gross script does.
Here is your LVM example: https://ptpb.pw/mk7y
More generally my WIP rewrite of the wiki: https://wiki.archlinux.org/index.php/Us … figuration
Managing AUR repos The Right Way -- aurpublish (now a standalone tool)
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I think that LVM example wouldn't work. My grub.cfg ended up showing this:
linux /root/boot/vmlinuz-linux root=UUID=c1519a2d-d095-4cfe-965b-6e516c1150a9 rw rootflags=subvol=root quiet
Also I am not working with logical volumes or anything relating to LVM. I heard that btrfs has nothing to do with LVM as they are subvolumes not logical volumes.
I also have no understanding how fstab, grub.cfg, the kernel, etc, all work in order to setup the grub.cfg and fstab manually for subvolumes since I was doing flat subvolume scheme.
https://btrfs.wiki.kernel.org/index.php … Guide#Flat
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You don't need to setup the fstab manually, you can use genfstab just like you do with any other method.
There is nothing you need to do with the kernel either.
Btrfs subvolumes are only a little more complicated than anything else. There are two things to consider: first, the path to the /boot/.... files must be relative to the root mountpoint, without subvolumes -- so since you said you have a subvolume label "root" which is I assume in /root/ on the btrfs volume and when you pacstrapped to /mnt while in the installation ISO, you mounted it using
mount -o subvol=root /dev/sdb3 /mnt/
Then the path you want to tell grub to boot, is "linux /root/boot/vmlinuz-linux" and "initrd /root/boot/initramfs-linux.img".
As with any bootloader, in order to tell the kernel to mount the correct subvolume as the root filesystem, pass the "subvol=root" option on the kernel command line as "rootflags=subvol=root".
Managing AUR repos The Right Way -- aurpublish (now a standalone tool)
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