diff options
| -rwxr-xr-x | squashfu | 89 |
1 files changed, 58 insertions, 31 deletions
@@ -1,48 +1,56 @@ #!/bin/bash -# Declare base options, overwrite with user specs as necessary -# MAKE SURE TO CHANGE THIS BEFORE PUSHING PUBLIC -CONFIG=/home/haruko/dev/git/squashfu/etc/squashfu -source $CONFIG -if [[ $? -gt 0 ]]; then - echo "FATAL: Error in config file. Please check your syntax" - exit 1 -fi - -# Informational output w/ happy colors +DEBUG=true debug () { - echo -e '\033[1;33m??\033[1;m ' $* + [[ $DEBUG ]] && echo -e '\033[1;33m??\033[1;m ' $* +} + +info () { + echo -e '\033[1;34m::\033[1;m ' $* } die () { echo -e '\033[1;31m!!\033[1;m ' $* exit 1 } + +# Declare base options, overwrite with user specs as necessary +# MAKE SURE TO CHANGE THIS BEFORE PUSHING PUBLIC +CONFIG=/home/haruko/dev/git/squashfu/etc/squashfu +source $CONFIG +[[ $? -gt 0 ]] && die "Error in config file. Please check your syntax" + +# Informational output w/ happy colors mount_aufs_by_num () { # Check for the union already being mounted - grep "${BKUP_ROOT}/rw" /proc/mounts >/dev/null && umount "$BKUP_ROOT/rw" + grep "${BKUP_ROOT}/rw" /proc/mounts && umount "$BKUP_ROOT/rw" # build branch string branches="br=" - for i in `seq $1 -1 1`; do - branches="${branches}${BKUP_ROOT}/bins/${i}:" + for i in `seq 7 -1 1`; do + branches="${branches}${BKUP_ROOT}/bins/${i}=ro:" done - branches="${branches}${BKUP_ROOT}/ro" + branches="${branches}${BKUP_ROOT}/ro=ro" # build and execute mount command + debug "Mounting union as entirely read only" mount -t aufs none $BKUP_ROOT/rw -o udba=reval,$branches + + debug "Remount branch $i as read-write" + mount -o remount,mod:bins/$1=rw "${BKUP_ROOT}/rw" } create_new_seed () { # For our very first seed, we're writing directly to disk, so # Delete the data after the squashed seed has been created - [[ "$1" == "--initial" ]] && run_rsync + #[[ "$1" == "--initial" ]] && run_rsync # Create a new squashfs based on the contents of the union + debug "Making new squash seed $(basename $SEED)" mksquashfs "${BKUP_ROOT}/rw" "$SEED" -b 65536 # Delete the rsync source since its now squashed - [[ "$1" == "--initial" ]] && rm -rf "${BKUP_ROOT}/rw/*" + #[[ "$1" == "--initial" ]] && rm -rf "${BKUP_ROOT}/rw/*" } move_old_tree () { @@ -55,8 +63,7 @@ mount_seed () { debug "Mounting seed" # Mount the squashed seed, failing if we can't mount -o loop,ro "${SEED}" "${BKUP_ROOT}/ro" || { - echo FATAL: Error mounting $SEED; - exit 1; + die FATAL: Error mounting $SEED; } } @@ -73,48 +80,60 @@ run_rsync() { EXCLUDES=($(grep ^#- $CONFIG | cut -d- -f2-)) # rsync source to $BKUP_ROOT/rw - echo Rsync executing with: - echo Options: ${RSYNC_OPTS[@]} - echo Includes: ${INCLUDES[@]} - echo Excludes: ${EXCLUDES[@]} + debug "Rsync executing with:" + debug " Options: ${RSYNC_OPTS[@]}" + debug " Includes: ${INCLUDES[@]}" + debug " Excludes: ${EXCLUDES[@]}" rsync ${RSYNC_OPTS[@]} ${INCLUDES[@]} ${EXCLUDES[@]} ${BKUP_ROOT}/rw || return 1 } # Unmount union and squash unmount_all () { #Union must be unmounted first, or bad things happen + debug Unmounting union... + read -p "Continue..." umount "${BKUP_ROOT}/rw" + debug Unmounting squash... + read -p "Continue..." umount "$SEED" } # Sanity checks # - Are we root? -[[ $UID -eq 0 ]] || { echo "Must be root!"; exit 1; } +[[ $UID -eq 0 ]] || die Must be root! # - is our BKUP_ROOT valid? (FAIL) -[[ -w "${BKUP_ROOT}" ]] || - { echo "FATAL: Backup root '$BKUP_ROOT' is not a valid location!"; - echo "Please check the setting in /etc/squashfu"; exit 1; } +[[ -w "${BKUP_ROOT}" ]] || + die "Backup root is not accessible. Please check your setting in /etc/squashfu" # Blindly unmount all just in case unmount_all +read -p "Continue..." + # - do we have a proper (expected) directory structure in place? # Use cd to BKUP_ROOT to avoid issues with brace expansion in a quoted path cd "$BKUP_ROOT" && mkdir -p {rw,ro,bins/{1,2,3,4,5,6,7}} # Prep work # - does seed exist? (if not, our backup is creating the seed) -[[ -f "$SEED" ]] || { - echo "No seed found -- creating a new one..."; - create_new_seed "--initial"; +[[ -f "$SEED" ]] || { + debug "No seed found -- creating a new one..."; + create_new_seed; } + +read -p "Continue..." + # mount seed if it exists and is not already mounted -grep "${BKUP_ROOT}/ro" /proc/mounts >/dev/null || mount_seed +grep "${BKUP_ROOT}/ro" /proc/mounts || mount_seed + +read -p "Continue..." # Prepare union mount with proper bins mount_aufs_by_num $(( $(date +%u) + $MODIFIER )) +read -p "Continue..." + # Ready for backup! run_rsync @@ -132,8 +151,16 @@ run_rsync fi } +read -p "Continue..." unmount_all +# Do another sanity check -- check sizes of bins versus squash. +bin_size=$(du -s ${BKUP_ROOT}/bins | awk '{print $1}') +sfs_size=$(du -s $SEED awk '{print $1}') +if [[ bin_size -gt sfs_size ]]; then + info "Your incrementals are larger than your seed! You might consider resquashing your backup with $0 --resquash" +fi + # 6) Optional behavior # --seed-initial Create new seed # --rollback $1 $2 Rollback to the day specified by $1, mounting at $2 |