adafruit-mirror/Adafruit-Pi-ExternalRoot-Helper
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use "Partition unique GUID" from gdisk / GPT

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Ok, so the only way I was able to get this was using gdisk, and then only
after I switched from fdisk to parted for creating the partition.  (The
latter _seems_ way better, 'cause it takes scripted commands as arguments
and does atomic operations, but there may be weirdness I don't understand.)

I don't really understand the different between this value and the one you can
get with blkid and tune2fs (which seem to give me the same thing).  I'm kind
of awed there's no good way to just get this from a reasonable CLI interface.

The state of tooling and documentation around this stuff is _completely awful_.
This commit is contained in:
Brennen Bearnes 2015-04-13 01:02:28 +00:00
parent 82563e1ab7
commit b290a11335
1 changed files with 9 additions and 6 deletions
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15
adafruit-pi-externalroot-helper
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@ -34,7 +34,7 @@ function info() {
}
if [[ $EUID -ne 0 ]]; then
bail "adafruit-pi-externalroot-helper must be run as root. try: sudo adafruit-pi-externalroot-helper"
bail "must be run as root. try: sudo adafruit-pi-externalroot-helper"
fi
args=$(getopt -uo 'hvd:' -- $*)
@ -74,6 +74,9 @@ then
exit
fi
info "dependencies" "Installing gdisk, rsync, and pv."
apt-get install gdisk rsync pv
export target_partition="${target_drive}1"
info "fs create" "Creating ${target_partition}"
@ -87,11 +90,11 @@ info "fs id" "Getting UUID for target partition"
eval `blkid -o export "${target_partition}"`
export target_partition_uuid=$UUID
info "fs id" "Getting UUID for target filesystem"
export target_filesystem_uuid=`tune2fs -l ${target_partition} | grep 'Filesystem UUID' | awk '{print $3}'`
info "fs id" "Getting Partition unique GUID for target filesystem"
export partition_unique_guid=`echo 'i' | sudo gdisk /dev/sda | grep 'Partition unique GUID:' | awk '{print $4}'`
info "fs id" "Target partition UUID: ${target_partition_uuid}"
info "fs id" "Target filesystem UUID: ${target_filesystem_uuid}"
info "fs id" "Partition unique GUID: ${partition_unique_guid}"
info "fs copy" "Mounting ${target_partition} on /mnt"
mount "${target_partition}" /mnt
@ -101,11 +104,11 @@ info "fs copy" "Copying root filesystem to ${target_partition}"
info "boot config" "Configuring boot from {$target_partition}"
cp /boot/cmdline.txt /boot/cmdline.txt.bak
sed -i "s|root=\/dev\/mmcblk0p2|root=UUID=${target_partition_uuid} rootdelay=5|" /boot/cmdline.txt
sed -i "s|root=\/dev\/mmcblk0p2|root=PARTUUID=${partition_unique_guid} rootdelay=5|" /boot/cmdline.txt
info "boot config" "Commenting out old root partition in /etc/fstab, adding new one"
sed -i '/mmcblk0p2/s/^/#/' /mnt/etc/fstab
echo "/dev/disk/by-uuid/${target_filesystem_uuid} / ext4 defaults,noatime 0 1" >> /mnt/etc/fstab
echo "/dev/disk/by-uuid/${target_partition_uuid} / ext4 defaults,noatime 0 1" >> /mnt/etc/fstab
cat /etc/fstab
info "boot config" "Ok, your system should be ready. You may wish to check:"