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Nuke when graphdir is a mount 

Previously, when the graphdir was a root of a mountpoint, we would not
be able to cleanup the graphdir, as the script would umount in case
target dir is a mount itself

```/etc/mtab
/dev/xvdc1 /var/lib/docker btrfs
```

When running the script, the graphdir would be unmounted and it would
remove a (possibly) empty folder.

```
Nuking /var/lib/docker ...
  (if this is wrong, press Ctrl+C NOW!)

  + sleep 10

  + umount -f /var/lib/docker
  + rm -rf /var/lib/docker
  ```

This PR includes the necessary changes to nuke the folder on this
scenario, including when the graphdir is a btrfs mount iself.

Signed-off-by: Bruno Tavares <btavare@thoughtworks.com>
This commit is contained in:
Bruno Tavares 2016-10-28 17:41:40 -02:00
parent f81c538fec
commit 5f98b97749
1 changed files with 5 additions and 3 deletions
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8
contrib/nuke-graph-directory.sh
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@ -44,7 +44,7 @@ dir_in_dir() {
# (like -v /home:... for example - DON'T DELETE MY HOME DIRECTORY BRU!)
for mount in $(awk '{ print $5 }' /proc/self/mountinfo); do
mount="$(readlink -f "$mount" || true)"
if dir_in_dir "$mount" "$dir"; then
if [ "$dir" != "$mount" ] && dir_in_dir "$mount" "$dir"; then
( set -x; umount -f "$mount" )
fi
done
@ -54,9 +54,11 @@ if command -v btrfs > /dev/null 2>&1; then
# Find btrfs subvolumes under $dir checking for inode 256
# Source: http://stackoverflow.com/a/32865333
for subvol in $(find "$dir" -type d -inum 256 | sort -r); do
( set -x; btrfs subvolume delete "$subvol" )
if [ "$dir" != "$subvol" ]; then
( set -x; btrfs subvolume delete "$subvol" )
fi
done
fi
# finally, DESTROY ALL THINGS
( set -x; rm -rf "$dir" )
( shopt -s dotglob; set -x; rm -rf "$dir"/* )