Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | #!/bin/sh |
| 2 | |
| 3 | . /etc/default/rcS |
| 4 | |
| 5 | [ "$ROOTFS_READ_ONLY" = "no" ] && exit 0 |
| 6 | |
| 7 | is_on_read_only_partition () { |
| 8 | DIRECTORY=$1 |
| 9 | dir=`readlink -f $DIRECTORY` |
| 10 | while true; do |
| 11 | if [ ! -d "$dir" ]; then |
| 12 | echo "ERROR: $dir is not a directory" |
| 13 | exit 1 |
| 14 | else |
| 15 | for flag in `awk -v dir=$dir '{ if ($2 == dir) { print "FOUND"; split($4,FLAGS,",") } }; \ |
| 16 | END { for (f in FLAGS) print FLAGS[f] }' < /proc/mounts`; do |
| 17 | [ "$flag" = "FOUND" ] && partition="read-write" |
| 18 | [ "$flag" = "ro" ] && { partition="read-only"; break; } |
| 19 | done |
| 20 | if [ "$dir" = "/" -o -n "$partition" ]; then |
| 21 | break |
| 22 | else |
| 23 | dir=`dirname $dir` |
| 24 | fi |
| 25 | fi |
| 26 | done |
| 27 | [ "$partition" = "read-only" ] && echo "yes" || echo "no" |
| 28 | } |
| 29 | |
| 30 | if [ "$1" = "start" ] ; then |
| 31 | if [ `is_on_read_only_partition /var/lib` = "yes" ]; then |
| 32 | grep -q "tmpfs /var/volatile" /proc/mounts || mount /var/volatile |
| 33 | mkdir -p /var/volatile/lib |
| 34 | cp -a /var/lib/* /var/volatile/lib |
| 35 | mount --bind /var/volatile/lib /var/lib |
| 36 | fi |
| 37 | fi |
| 38 | |