mirror of
https://github.com/laurent22/rsync-time-backup
synced 2024-09-20 14:31:56 +00:00
339 lines
12 KiB
Bash
339 lines
12 KiB
Bash
#!/usr/bin/env bash
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APPNAME=$(basename $0 | sed "s/\.sh$//")
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# -----------------------------------------------------------------------------
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# Log functions
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# -----------------------------------------------------------------------------
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fn_log_info() { echo "$APPNAME: $1"; }
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fn_log_warn() { echo "$APPNAME: [WARNING] $1" 1>&2; }
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fn_log_error() { echo "$APPNAME: [ERROR] $1" 1>&2; }
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fn_log_info_cmd() {
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if [ -n "$SSH_CMD" ]; then
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echo "$APPNAME: $SSH_CMD '$1'";
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else
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echo "$APPNAME: $1";
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fi
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}
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# -----------------------------------------------------------------------------
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# Make sure everything really stops when CTRL+C is pressed
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# -----------------------------------------------------------------------------
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fn_terminate_script() {
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fn_log_info "SIGINT caught."
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exit 1
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}
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trap 'fn_terminate_script' SIGINT
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# -----------------------------------------------------------------------------
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# Small utility functions for reducing code duplication
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# -----------------------------------------------------------------------------
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fn_parse_date() {
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# Converts YYYY-MM-DD-HHMMSS to YYYY-MM-DD HH:MM:SS and then to Unix Epoch.
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case "$OSTYPE" in
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linux*) date -d "${1:0:10} ${1:11:2}:${1:13:2}:${1:15:2}" +%s ;;
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cygwin*) date -d "${1:0:10} ${1:11:2}:${1:13:2}:${1:15:2}" +%s ;;
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darwin*) date -j -f "%Y-%m-%d-%H%M%S" "$1" "+%s" ;;
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esac
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}
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fn_find_backups() {
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fn_run_cmd "find "$DEST_FOLDER" -type d -name "????-??-??-??????" -prune | sort -r"
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}
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fn_expire_backup() {
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# Double-check that we're on a backup destination to be completely
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# sure we're deleting the right folder
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if [ -z "$(fn_find_backup_marker "$(dirname -- "$1")")" ]; then
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fn_log_error "$1 is not on a backup destination - aborting."
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exit 1
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fi
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fn_log_info "Expiring $1"
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fn_rm "$1"
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}
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fn_parse_ssh() {
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if [[ "$DEST_FOLDER" =~ ^[A-Za-z0-9\._%\+\-]+@[A-Za-z0-9.\-]+\:.+$ ]]
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then
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SSH_USER=$(echo "$DEST_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\1/')
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SSH_HOST=$(echo "$DEST_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\2/')
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SSH_DEST_FOLDER=$(echo "$DEST_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\3/')
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SSH_CMD="ssh ${SSH_USER}@${SSH_HOST}"
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SSH_FOLDER_PREFIX="${SSH_USER}@${SSH_HOST}:"
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fi
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}
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fn_run_cmd() {
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if [ -n "$SSH_CMD" ]
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then
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eval "$SSH_CMD '$1'"
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else
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eval $1
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fi
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}
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fn_find() {
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fn_run_cmd "find $1" 2>/dev/null
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}
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fn_get_absolute_path() {
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fn_run_cmd "cd $1;pwd"
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}
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fn_mkdir() {
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fn_run_cmd "mkdir -p -- $1"
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}
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fn_rm() {
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fn_run_cmd "rm -rf -- $1"
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}
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fn_touch() {
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fn_run_cmd "touch -- $1"
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}
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fn_ln() {
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fn_run_cmd "ln -vs -- $1 $2"
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}
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# -----------------------------------------------------------------------------
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# Source and destination information
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# -----------------------------------------------------------------------------
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SSH_USER=""
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SSH_HOST=""
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SSH_DEST_FOLDER=""
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SSH_CMD=""
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SSH_FOLDER_PREFIX=""
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SRC_FOLDER="${1%/}"
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DEST_FOLDER="${2%/}"
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EXCLUSION_FILE="$3"
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fn_parse_ssh
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if [ -n "$SSH_DEST_FOLDER" ]; then
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DEST_FOLDER="$SSH_DEST_FOLDER"
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fi
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for ARG in "$SRC_FOLDER" "$DEST_FOLDER" "$EXCLUSION_FILE"; do
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if [[ "$ARG" == *"'"* ]]; then
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fn_log_error 'Arguments may not have any single quote characters.'
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exit 1
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fi
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done
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# -----------------------------------------------------------------------------
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# Check that the destination drive is a backup drive
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# -----------------------------------------------------------------------------
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# TODO: check that the destination supports hard links
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fn_backup_marker_path() { echo "$1/backup.marker"; }
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fn_find_backup_marker() { fn_find "$(fn_backup_marker_path "$1")" 2>/dev/null; }
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if [ -z "$(fn_find_backup_marker "$DEST_FOLDER")" ]; then
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fn_log_info "Safety check failed - the destination does not appear to be a backup folder or drive (marker file not found)."
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fn_log_info "If it is indeed a backup folder, you may add the marker file by running the following command:"
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fn_log_info ""
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fn_log_info_cmd "mkdir -p -- \"$DEST_FOLDER\" ; touch \"$(fn_backup_marker_path "$DEST_FOLDER")\""
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fn_log_info ""
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exit 1
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fi
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# -----------------------------------------------------------------------------
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# Setup additional variables
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# -----------------------------------------------------------------------------
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# Date logic
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NOW=$(date +"%Y-%m-%d-%H%M%S")
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EPOCH=$(date "+%s")
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KEEP_ALL_DATE=$((EPOCH - 86400)) # 1 day ago
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KEEP_DAILIES_DATE=$((EPOCH - 2678400)) # 31 days ago
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export IFS=$'\n' # Better for handling spaces in filenames.
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PROFILE_FOLDER="$HOME/.$APPNAME"
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DEST="$DEST_FOLDER/$NOW"
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PREVIOUS_DEST="$(fn_find_backups | head -n 1)"
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INPROGRESS_FILE="$DEST_FOLDER/backup.inprogress"
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MYPID="$$"
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# -----------------------------------------------------------------------------
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# Create profile folder if it doesn't exist
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# -----------------------------------------------------------------------------
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if [ ! -d "$PROFILE_FOLDER" ]; then
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fn_log_info "Creating profile folder in '$PROFILE_FOLDER'..."
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mkdir -- "$PROFILE_FOLDER"
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fi
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# -----------------------------------------------------------------------------
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# Handle case where a previous backup failed or was interrupted.
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# -----------------------------------------------------------------------------
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if [ -n "$(fn_find "$INPROGRESS_FILE")" ]; then
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RUNNINGPID="$(fn_run_cmd "cat $INPROGRESS_FILE")"
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if [ "$RUNNINGPID"="$(pgrep "$APPNAME")" ]; then
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fn_log_error "Previous backup task is still active - aborting."
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exit 1
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fi
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if [ -n "$PREVIOUS_DEST" ]; then
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# - Last backup is moved to current backup folder so that it can be resumed.
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# - 2nd to last backup becomes last backup.
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fn_log_info "$SSH_FOLDER_PREFIX$INPROGRESS_FILE already exists - the previous backup failed or was interrupted. Backup will resume from there."
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fn_run_cmd "mv -- $PREVIOUS_DEST $DEST"
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if [ "$(fn_find_backups | wc -l)" -gt 1 ]; then
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PREVIOUS_DEST="$(fn_find_backups | sed -n '2p')"
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else
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PREVIOUS_DEST=""
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fi
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# update PID to current process to avoid multiple concurrent resumes
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fn_run_cmd "echo $MYPID > $INPROGRESS_FILE"
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fi
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fi
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# Run in a loop to handle the "No space left on device" logic.
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while : ; do
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# -----------------------------------------------------------------------------
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# Check if we are doing an incremental backup (if previous backup exists).
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# -----------------------------------------------------------------------------
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LINK_DEST_OPTION=""
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if [ -z "$PREVIOUS_DEST" ]; then
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fn_log_info "No previous backup - creating new one."
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else
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# If the path is relative, it needs to be relative to the destination. To keep
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# it simple, just use an absolute path. See http://serverfault.com/a/210058/118679
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PREVIOUS_DEST="$(fn_get_absolute_path "$PREVIOUS_DEST")"
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fn_log_info "Previous backup found - doing incremental backup from $SSH_FOLDER_PREFIX$PREVIOUS_DEST"
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LINK_DEST_OPTION="--link-dest='$PREVIOUS_DEST'"
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fi
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# -----------------------------------------------------------------------------
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# Create destination folder if it doesn't already exists
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# -----------------------------------------------------------------------------
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if [ -z "$(fn_find "$DEST -type d" 2>/dev/null)" ]; then
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fn_log_info "Creating destination $SSH_FOLDER_PREFIX$DEST"
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fn_mkdir "$DEST"
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fi
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# -----------------------------------------------------------------------------
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# Purge certain old backups before beginning new backup.
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# -----------------------------------------------------------------------------
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# Default value for $PREV ensures that the most recent backup is never deleted.
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PREV="0000-00-00-000000"
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for FILENAME in $(fn_find_backups | sort -r); do
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BACKUP_DATE=$(basename "$FILENAME")
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TIMESTAMP=$(fn_parse_date $BACKUP_DATE)
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# Skip if failed to parse date...
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if [ -z "$TIMESTAMP" ]; then
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fn_log_warn "Could not parse date: $FILENAME"
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continue
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fi
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if [ $TIMESTAMP -ge $KEEP_ALL_DATE ]; then
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true
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elif [ $TIMESTAMP -ge $KEEP_DAILIES_DATE ]; then
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# Delete all but the most recent of each day.
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[ "${BACKUP_DATE:0:10}" == "${PREV:0:10}" ] && fn_expire_backup "$FILENAME"
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else
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# Delete all but the most recent of each month.
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[ "${BACKUP_DATE:0:7}" == "${PREV:0:7}" ] && fn_expire_backup "$FILENAME"
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fi
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PREV=$BACKUP_DATE
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done
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# -----------------------------------------------------------------------------
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# Start backup
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# -----------------------------------------------------------------------------
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LOG_FILE="$PROFILE_FOLDER/$(date +"%Y-%m-%d-%H%M%S").log"
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fn_log_info "Starting backup..."
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fn_log_info "From: $SRC_FOLDER"
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fn_log_info "To: $SSH_FOLDER_PREFIX$DEST"
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CMD="rsync"
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if [ -n "$SSH_CMD" ]; then
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CMD="$CMD -e 'ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'"
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fi
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CMD="$CMD --compress"
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CMD="$CMD --numeric-ids"
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CMD="$CMD --links"
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CMD="$CMD --hard-links"
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CMD="$CMD --one-file-system"
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CMD="$CMD --archive"
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CMD="$CMD --itemize-changes"
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CMD="$CMD --verbose"
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CMD="$CMD --log-file '$LOG_FILE'"
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if [ -n "$EXCLUSION_FILE" ]; then
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# We've already checked that $EXCLUSION_FILE doesn't contain a single quote
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CMD="$CMD --exclude-from '$EXCLUSION_FILE'"
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fi
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CMD="$CMD $LINK_DEST_OPTION"
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CMD="$CMD -- '$SRC_FOLDER/' '$SSH_FOLDER_PREFIX$DEST/'"
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CMD="$CMD | grep -E '^deleting|[^/]$'"
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fn_log_info "Running command:"
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fn_log_info "$CMD"
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fn_run_cmd "echo $MYPID > $INPROGRESS_FILE"
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eval $CMD
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# -----------------------------------------------------------------------------
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# Check if we ran out of space
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# -----------------------------------------------------------------------------
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# TODO: find better way to check for out of space condition without parsing log.
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NO_SPACE_LEFT="$(grep "No space left on device (28)\|Result too large (34)" "$LOG_FILE")"
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if [ -n "$NO_SPACE_LEFT" ]; then
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fn_log_warn "No space left on device - removing oldest backup and resuming."
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if [[ "$(fn_find_backups | wc -l)" -lt "2" ]]; then
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fn_log_error "No space left on device, and no old backup to delete."
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exit 1
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fi
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fn_expire_backup "$(fn_find_backups | tail -n 1)"
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# Resume backup
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continue
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fi
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# -----------------------------------------------------------------------------
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# Check whether rsync reported any errors
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# -----------------------------------------------------------------------------
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if [ -n "$(grep "rsync:" "$LOG_FILE")" ]; then
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fn_log_warn "Rsync reported a warning, please check '$LOG_FILE' for more details."
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fi
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if [ -n "$(grep "rsync error:" "$LOG_FILE")" ]; then
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fn_log_error "Rsync reported an error, please check '$LOG_FILE' for more details."
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exit 1
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fi
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# -----------------------------------------------------------------------------
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# Add symlink to last successful backup
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# -----------------------------------------------------------------------------
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fn_rm "$DEST_FOLDER/latest"
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fn_ln "$(basename -- "$DEST")" "$DEST_FOLDER/latest"
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fn_rm "$INPROGRESS_FILE"
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rm -f -- "$LOG_FILE"
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fn_log_info "Backup completed without errors."
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exit 0
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done
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