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datapart init script: automatically detect data partition start

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This commit is contained in:
Calin Crisan 2017-06-01 20:34:15 +03:00
parent 4157dcfdba
commit 6bb71ef9da
1 changed files with 9 additions and 5 deletions
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14
board/common/overlay/etc/init.d/S00datapart
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@ -3,15 +3,17 @@
test -n "$os_version" || source /etc/init.d/base
msg_begin "Detecting disk device"
root_part=$(cat /proc/cmdline | grep -oE 'root=[/a-z0-9]+' | cut -d '=' -f 2)
if [[ "$root_part" =~ ^([/a-z0-9]+)(p[0-9])$ ]]; then # e.g. /dev/mmcblk0p2
root_dev=$(cat /proc/cmdline | grep -oE 'root=[/a-z0-9]+' | cut -d '=' -f 2)
if [[ "$root_dev" =~ ^([/a-z0-9]+)(p[0-9])$ ]]; then # e.g. /dev/mmcblk0p2
disk_dev=${BASH_REMATCH[1]}
boot_dev=${disk_dev}p1
data_dev=${disk_dev}p3
elif [[ "$root_part" =~ ^([/a-z0-9]+)([0-9])$ ]]; then # e.g. /dev/sdc2
elif [[ "$root_dev" =~ ^([/a-z0-9]+)([0-9])$ ]]; then # e.g. /dev/sdc2
disk_dev=${BASH_REMATCH[1]}
boot_dev=${disk_dev}1
data_dev=${disk_dev}3
else
msg_fail "unknown ($root_part)"
msg_fail "unknown ($root_dev)"
exit 1
fi
msg_done "$disk_dev"
@ -21,10 +23,12 @@ test -b $data_dev && exit 0
case "$1" in
start)
msg_begin "Creating data partition"
root_end=$(partx -s -g -o END $root_dev)
data_start=$(($root_end + 1))
echo -e "n
p
3
\n
${data_start}
\n
w" | /sbin/fdisk $disk_dev 2>&1 >/dev/null | grep -v "Device or resource busy" | grep -v '^$'
partx -a $disk_dev &>/dev/null