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Create a 100MB "mutable" partition after the backingfiles partition.

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cimryan
2018-10-27 08:54:39 -07:00
parent 76924aba06
commit b2111722a7
2 changed files with 26 additions and 7 deletions
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25
setup/pi/create-backingfiles-partition.sh
View File

@@ -1,16 +1,27 @@
#!/bin/bash -eu
BACKINGFILES_MOUNTPOINT="$1"
PARTITION_TABLE=$(parted -m /dev/mmcblk0 unit s print)
ROOT_PARTITION_LINE=$(echo "$PARTITION_TABLE" | grep -e "^2:")
LAST_ROOT_PARTITION_SECTOR=$(echo "$ROOT_PARTITION_LINE" | sed 's/s//g' | cut -d ":" -f 3)
MUTABLE_MOUNTPOINT="$2"
FIRST_BACKINGFILES_PARTITION_SECTOR=$(( $LAST_ROOT_PARTITION_SECTOR + 1 ))
PARTITION_TABLE=$(parted -m /dev/mmcblk0 unit B print)
DISK_LINE=$(echo "$PARTITION_TABLE" | grep -e "^/dev/mmcblk0:")
DISK_SIZE=$(echo "$DISK_LINE" | cut -d ":" -f 2 | sed 's/B//' )
ROOT_PARTITION_LINE=$(echo "$PARTITION_TABLE" | grep -e "^2:")
LAST_ROOT_PARTITION_BYTE=$(echo "$ROOT_PARTITION_LINE" | sed 's/B//g' | cut -d ":" -f 3)
FIRST_BACKINGFILES_PARTITION_BYTE="$(( $LAST_ROOT_PARTITION_BYTE + 1 ))"
LAST_BACKINGFILES_PARTITION_DESIRED_BYTE="$(( $DISK_SIZE - (100 * (2 ** 20)) - 1))"
ORIGINAL_DISK_IDENTIFIER=$( fdisk -l /dev/mmcblk0 | grep -e "^Disk identifier" | sed "s/Disk identifier: 0x//" )
parted -m /dev/mmcblk0 u s mkpart primary ext4 "$FIRST_BACKINGFILES_PARTITION_SECTOR" 100%
BACKINGFILES_PARTITION_END_SPEC="$(( $LAST_BACKINGFILES_PARTITION_DESIRED_BYTE / 1000000 ))M"
parted -a optimal -m /dev/mmcblk0 unit B mkpart primary ext4 "$FIRST_BACKINGFILES_PARTITION_BYTE" "$BACKINGFILES_PARTITION_END_SPEC"
LAST_BACKINGFILES_PARTITION_BYTE=$(parted -m /dev/mmcblk0 unit B print | grep -e "^3:" | cut -d ":" -f 3 | sed 's/B//g' )
MUTABLE_PARTITION_START_SPEC="$(( $LAST_BACKINGFILES_PARTITION_BYTE / 1000000 ))M"
parted -a optimal -m /dev/mmcblk0 unit B mkpart primary ext4 "$MUTABLE_PARTITION_START_SPEC" 100%
NEW_DISK_IDENTIFIER=$( fdisk -l /dev/mmcblk0 | grep -e "^Disk identifier" | sed "s/Disk identifier: 0x//" )
@@ -18,5 +29,7 @@ sed -i "s/${ORIGINAL_DISK_IDENTIFIER}/${NEW_DISK_IDENTIFIER}/g" /etc/fstab
sed -i "s/${ORIGINAL_DISK_IDENTIFIER}/${NEW_DISK_IDENTIFIER}/" /boot/cmdline.txt
mkfs.ext4 -F /dev/mmcblk0p3
mkfs.ext4 -F /dev/mmcblk0p4
echo "/dev/mmcblk0p3 $BACKINGFILES_MOUNTPOINT ext4 auto,rw,noatime 0 2" >> /etc/fstab
echo "/dev/mmcblk0p4 $MUTABLE_MOUNTPOINT ext4 auto,rw 0 2" >> /etc/fstab

8
setup/pi/setup-teslausb
View File

@@ -83,6 +83,7 @@ function fix_cmdline_txt_modules_load ()
}
BACKINGFILES_MOUNTPOINT=/backingfiles
MUTABLE_MOUNTPOINT=/mutable
function create_usb_drive_backing_files () {
if [ ! -e "$BACKINGFILES_MOUNTPOINT" ]
@@ -90,9 +91,14 @@ function create_usb_drive_backing_files () {
mkdir "$BACKINGFILES_MOUNTPOINT"
fi
if [ ! -e "$MUTABLE_MOUNTPOINT" ]
then
mkdir "$MUTABLE_MOUNTPOINT"
fi
if [ ! -e /dev/mmcblk0p3 ]
then
/tmp/create-backingfiles-partition.sh "$BACKINGFILES_MOUNTPOINT"
/tmp/create-backingfiles-partition.sh "$BACKINGFILES_MOUNTPOINT" "$MUTABLE_MOUNTPOINT"
fi
if ! findmnt --mountpoint $BACKINGFILES_MOUNTPOINT