5f98b97749
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>
64 lines
1.4 KiB
Bash
Executable file
64 lines
1.4 KiB
Bash
Executable file
#!/bin/sh
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set -e
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dir="$1"
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if [ -z "$dir" ]; then
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{
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echo 'This script is for destroying old /var/lib/docker directories more safely than'
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echo ' "rm -rf", which can cause data loss or other serious issues.'
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echo
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echo "usage: $0 directory"
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echo " ie: $0 /var/lib/docker"
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} >&2
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exit 1
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fi
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if [ "$(id -u)" != 0 ]; then
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echo >&2 "error: $0 must be run as root"
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exit 1
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fi
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if [ ! -d "$dir" ]; then
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echo >&2 "error: $dir is not a directory"
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exit 1
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fi
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dir="$(readlink -f "$dir")"
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echo
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echo "Nuking $dir ..."
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echo ' (if this is wrong, press Ctrl+C NOW!)'
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echo
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( set -x; sleep 10 )
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echo
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dir_in_dir() {
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inner="$1"
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outer="$2"
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[ "${inner#$outer}" != "$inner" ]
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}
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# let's start by unmounting any submounts in $dir
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# (like -v /home:... for example - DON'T DELETE MY HOME DIRECTORY BRU!)
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for mount in $(awk '{ print $5 }' /proc/self/mountinfo); do
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mount="$(readlink -f "$mount" || true)"
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if [ "$dir" != "$mount" ] && dir_in_dir "$mount" "$dir"; then
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( set -x; umount -f "$mount" )
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fi
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done
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# now, let's go destroy individual btrfs subvolumes, if any exist
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if command -v btrfs > /dev/null 2>&1; then
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# Find btrfs subvolumes under $dir checking for inode 256
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# Source: http://stackoverflow.com/a/32865333
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for subvol in $(find "$dir" -type d -inum 256 | sort -r); do
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if [ "$dir" != "$subvol" ]; then
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( set -x; btrfs subvolume delete "$subvol" )
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fi
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done
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fi
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# finally, DESTROY ALL THINGS
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( shopt -s dotglob; set -x; rm -rf "$dir"/* )
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