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100 lines
2.9 KiB
100 lines
2.9 KiB
#!/bin/bash
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##
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## btrfs install
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##
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#BTRFS_DEVICE=
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BTRFS_MOUNT_ROOT=${BTRFS_MOUNT_ROOT:-"/mnt/btrfs-root"}
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if [ -z "$BTRFS_DEVICE" ]; then
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echo "You must set a BTRFS_DEVICE environment variable prior to executing this hook."
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exit 1
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fi
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apt-get install -y btrfs-tools
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if [ "$FORCE" != "yes" ]; then
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echo "the following is dangerous code. Please execute with FORCE=yes."
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echo "it DELETES directory /var/lib/docker if you have one."
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exit 1
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fi
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## "$BTRFS_DEVICE" device should not be mounted
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if mount | egrep ^"$BTRFS_DEVICE\s+" >/dev/null 2>&1; then
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umount "$BTRFS_DEVICE" || {
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echo "Can't umount $BTRFS_DEVICE. Aborting script."
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exit 1
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}
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echo "Unmounted $BTRFS_DEVICE."
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fi
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if egrep ^"$BTRFS_DEVICE\s+" /etc/fstab >/dev/null 2>&1; then
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sed -r -i "\%^$BTRFS_DEVICE\s+%d" /etc/fstab || {
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echo "Couldn't remove device $BTRFS_DEVICE from fstab."
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exit 1
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}
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echo "Removed device $BTRFS_DEVICE from fstab."
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fi
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## Format the device and add entry in fstab
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mkfs.btrfs -f "$BTRFS_DEVICE"
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## No need of UID it seems:
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# UUID="$(blkid -s UUID $BTRFS_DEVICE -o value)"
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# echo "UUID=$UUID $BTRFS_MOUNT_ROOT btrfs defaults,relatime,compress=lzo,space_cache,auto 0 0" >> /etc/fstab
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echo "$BTRFS_DEVICE $BTRFS_MOUNT_ROOT btrfs defaults,relatime,compress=lzo,space_cache,auto 0 0" >> /etc/fstab
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## Mount point and mount device
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mkdir "$BTRFS_MOUNT_ROOT" -p
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mount "$BTRFS_MOUNT_ROOT"
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if [ -d /var/lib/docker ] ; then
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RESTART_DOCKER=yes
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service docker stop
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## XXXvlab: moving doesn't work and is not desirable, as we want docker
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## to setup and detect new underlying btrfs system.
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# mv "/var/lib/docker/"* "$BTRFS_MOUNT_ROOT/var/lib/docker"
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rm -rf /var/lib/docker/*
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fi
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## Build subvolume structure
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for d in /home /var{/{lib,cache,backups}/lxc,/lib/docker} \
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/var/backups/snapshot \
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/srv/datastore{,/config,/data}; do
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mkdir -p "$(dirname "$BTRFS_MOUNT_ROOT$d")" ## creates parent directory of subvolume
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btrfs subvolume create "$BTRFS_MOUNT_ROOT$d"
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mkdir -p "$d"
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binds=$(cat /etc/fstab | egrep '\s+none\s+' | grep bind | grep -v '^\s+#' | sed -r 's/^\s*([^ ]+).*$/\1/g')
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for b in $binds; do
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if [[ "$BTRFS_MOUNT_ROOT$d/" == "$b/"* ]]; then
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echo "Directory '$d' is already available via bind '$b'."
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continue 2
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fi
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done
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## Add bind to /etc/fstab
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echo "$BTRFS_MOUNT_ROOT$d $d none bind,defaults,auto 0 0" >> /etc/fstab
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done
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## Mount all binds
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mount -a
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[ -z "$RESTART_DOCKER" ] || service docker start
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## Prevent mlocate from fetching unwanted informations
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if [ -e "/etc/updatedb.conf" ]; then
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## Without this, especially backup host can have 18Go locate database.
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sed -ri 's/^\s*#\s*PRUNENAMES=/PRUNENAMES=/g;s%^(\s*PRUNEPATHS=".*)("\s*$)+%\1 /mnt/btrfs-root /var/backup/lxc /var/backup/snapshot\2%g' /etc/updatedb.conf
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fi
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