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void-minecraft-usb
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backup-fs: Deal with overlay showing up as multiple file systems 

Before, we would simply pass -one-file-system to mksquashfs,
now we go through all mount points to generate a list of all directories
to exclude and add the mount points as pseudo files to the squashfs.
master
BodgeMaster 2023-06-29 20:13:18 +02:00
parent 61646d9d04
commit 7ca06298bb
1 changed files with 31 additions and 7 deletions
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38
opt/backup-fs
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@ -27,14 +27,40 @@ function yesno {
done
}
#TODO: remove
bash -i < $TTY_OR_CONSOLE
# cutting off the leading slash allows us to just ignore empty lines below
readarray -t MOUNT_LIST <<< "$(findmnt --output TARGET --noheadings --raw | sed -e 's|^/||' | sort)"
# always ignore /tmp and the package cache
EXCLUDE_LIST=("tmp" "var/cache/xbps")
for I in ${!MOUNT_LIST[@]}; do
if [ ! -z "${MOUNT_LIST[$I]}" ]; then
FOUND=0
for J in ${!EXCLUDE_LIST[@]}; do
if grep "${EXCLUDE_LIST[$J]}" > /dev/null <<< "${MOUNT_LIST[$I]}"; then
FOUND=1
break
fi
done
# if no parent dir of ${MOUNT_LIST[$I]} is found in $EXCLUDE_LIST
if [ $FOUND -eq 0 ]; then
EXCLUDE_LIST+=("${MOUNT_LIST[$I]}")
fi
fi
done
touch /run/void-usb/backup-fs-excludes
touch /run/void-usb/backup-fs-pseudo
for I in ${!EXCLUDE_LIST[@]}; do
echo "/${EXCLUDE_LIST[$I]}" >> /run/void-usb/backup-fs-excludes
FILE_PERMS="$(stat -c '%a %u %g' "${EXCLUDE_LIST[$I]}")"
echo "\"/${EXCLUDE_LIST[$I]}\" d $FILE_PERMS" >> /run/void-usb/backup-fs-pseudo
done
#TODO: refuse to run if system is running
#TODO: add a way to tell the system whether to back up before shutting down
#TODO: add a way to force backing up without asking (for example a file in /run/void-usb)
#TODO: colors
#TODO: colors (bright white / light gray for readability)
echo "Back up system changes to disk?
This only affects things outside the /home directory.
@ -43,9 +69,7 @@ Backing up the system will take some time.
if yesno; then
echo "Backing up..."
#TODO: fiddle with squashfs parameters to find optimal settings
#TODO: exclude /tmp
mksquashfs / /run/void-usb/container/new_squashfs.img -b 1M -comp xz -one-file-system -progress -noappend -e /var/cache/xbps
mksquashfs / /run/void-usb/container/new_squashfs.img -b 1M -comp xz -progress -noappend -pf /run/void-usb/backup-fs-pseudo -ef /run/void-usb/backup-fs-excludes
#TODO: check if enough disk space
# yes -> create new image next to old image
# no -> create new image in RAM