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flex manual install

 install chrome os flex from linux without USB

sudo dnf install cgpt pv

find latest brunch release branch at this time its r126
https://github.com/sebanc/brunch/tree/r126
grab https://github.com/sebanc/brunch/blob/r126/scripts/chromeos-install.sh

get rid of these lines from install_singleboot()

 
7)
            source_start=0
            image="$(dirname $0)/rootc.img"
            size=$(du --apparent-size -B 512 $image | sed 's/\t.*//g')
        ;;
  12)
            source_start=0
            if [ -z legacy_boot ]; then image="$(dirname $0)/efi_secure.img"; else image="$(dirname $0)/efi_legacy.img"; fi
            size=$(du --apparent-size -B 512 $image | sed 's/\t.*//g')
        ;;

for dualboot maybe similarly from install_dualboot() 7) and 12) options , haven't tested

download chrome os flex image
https://chromiumdash.appspot.com/serving-builds?deviceCategory=ChromeOS%20Flex
or direct link via web or wget
wget https://dl.google.com/chromeos-flex/images/latest.bin.zip

unzip latest.bin.zip or 7z x latest.bin.zip
Archive: latest.bin.zip
inflating: chromeos_15393.58.0_reven_recovery_stable-channel_mp-v2.bin

partition

sudo chromeos-install.sh chrome.img /dev/nvme0n1
this will erase disk completly

ROOT-A is copied to partition 3,5 and KERN-B to 2,4 ; KERN-B and KERN-A looks identical

for postinstall fix we need to mount /dev/nvme0n1p12 and modify efi/boot/grub.cfg to match root=UUID=xxx of the cros partition wtih label root-A

i did manually there is postinstall script here https://github.com/imperador/chromefy/blob/master/croissant.sh
sudo bash fixuuid.sh

# use your install disk name
DST=/dev/nvme0n1
# grab name of 12th EFI-SYSTEM partition
EFIPART=`flock "${DST}" sfdisk -lq "${DST}" 2>/dev/null | grep "^""${DST}""[^:]" | awk '{print $1}' | grep [^0-9]12$`
mount "$EFIPART" /mnt   
OLD_UUID=`cat /mnt/efi/boot/grub.cfg | grep -m 1 "PARTUUID=" | awk -v FS="(PARTUUID=)" '{print $2}' | awk '{print $1}'`
# get PARTUUID of ROOT-A which is third partition
PARTUUID=`flock "${DST}" sfdisk --part-uuid "${DST}" 3`; sed -i "s/$OLD_UUID/$PARTUUID/" /mnt/efi/boot/grub.cfg
sync; umount /mnt 2>/dev/null
echo "EFI: Partition UUID $OLD_UUID changed to $PARTUUID"


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