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rsync-time-backup/rsync_tmbackup.sh
Laurent Cozic 7f1431c13a Fixed date parsing issue
2018-03-05 19:29:14 +00:00

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#!/usr/bin/env bash
APPNAME=$(basename $0 | sed "s/\.sh$//")
# -----------------------------------------------------------------------------
# Log functions
# -----------------------------------------------------------------------------
fn_log_info() { echo "$APPNAME: $1"; }
fn_log_warn() { echo "$APPNAME: [WARNING] $1" 1>&2; }
fn_log_error() { echo "$APPNAME: [ERROR] $1" 1>&2; }
fn_log_info_cmd() {
if [ -n "$SSH_DEST_FOLDER_PREFIX" ]; then
echo "$APPNAME: $SSH_CMD '$1'";
else
echo "$APPNAME: $1";
fi
}
# -----------------------------------------------------------------------------
# Make sure everything really stops when CTRL+C is pressed
# -----------------------------------------------------------------------------
fn_terminate_script() {
fn_log_info "SIGINT caught."
exit 1
}
trap 'fn_terminate_script' SIGINT
# -----------------------------------------------------------------------------
# Small utility functions for reducing code duplication
# -----------------------------------------------------------------------------
fn_display_usage() {
echo "Usage: $(basename $0) [OPTION]... <[USER@HOST:]SOURCE> <[USER@HOST:]DESTINATION> [exclude-pattern-file]"
echo ""
echo "Options"
echo " -p, --port SSH port."
echo " -h, --help Display this help message."
echo " --rsync-get-flags Display the default rsync flags that are used for backup."
echo " --rsync-set-flags Set the rsync flags that are going to be used for backup."
echo " --log-dir Set the log file directory. If this flag is set, generated files will"
echo " not be managed by the script - in particular they will not be"
echo " automatically deleted."
echo " Default: $LOG_DIR"
echo " --strategy Set the expiration strategy. Default: \"1:1 30:7 365:30\" means after one"
echo " day, keep one backup per day. After 30 days, keep one backup every 7 days."
echo " After 365 days keep one backup every 30 days."
echo ""
echo "For more detailed help, please see the README file:"
echo ""
echo "https://github.com/laurent22/rsync-time-backup/blob/master/README.md"
}
fn_parse_date() {
# Converts YYYY-MM-DD-HHMMSS to YYYY-MM-DD HH:MM:SS and then to Unix Epoch.
case "$OSTYPE" in
linux*) date -d "${1:0:10} ${1:11:2}:${1:13:2}:${1:15:2}" +%s ;;
cygwin*) date -d "${1:0:10} ${1:11:2}:${1:13:2}:${1:15:2}" +%s ;;
darwin8*) yy=`expr ${1:0:4}`
mm=`expr ${1:5:2} - 1`
dd=`expr ${1:8:2}`
hh=`expr ${1:11:2}`
mi=`expr ${1:13:2}`
ss=`expr ${1:15:2}`
# Because under MacOS X Tiger 'date -j' doesn't work, we do this:
perl -e 'use Time::Local; print timelocal('$ss','$mi','$hh','$dd','$mm','$yy'),"\n";' ;;
darwin*) date -j -f "%Y-%m-%d-%H%M%S" "$1" "+%s" ;;
FreeBSD*) date -j -f "%Y-%m-%d-%H%M%S" "$1" "+%s" ;;
esac
}
fn_find_backups() {
fn_run_cmd "find "$DEST_FOLDER/" -maxdepth 1 -type d -name \"????-??-??-??????\" -prune | sort -r"
}
fn_expire_backup() {
# Double-check that we're on a backup destination to be completely
# sure we're deleting the right folder
if [ -z "$(fn_find_backup_marker "$(dirname -- "$1")")" ]; then
fn_log_error "$1 is not on a backup destination - aborting."
exit 1
fi
fn_log_info "Expiring $1"
fn_rm_dir "$1"
}
fn_expire_backups() {
local current_timestamp=$EPOCH
local last_kept_timestamp=9999999999
# Process each backup dir from most recent to oldest
for backup_dir in $(fn_find_backups | sort -r); do
local backup_date=$(basename "$backup_dir")
local backup_timestamp=$(fn_parse_date "$backup_date")
# Skip if failed to parse date...
if [ -z "$backup_timestamp" ]; then
fn_log_warn "Could not parse date: $backup_dir"
continue
fi
# Find which strategy token applies to this particular backup
for strategy_token in $(echo $EXPIRATION_STRATEGY | tr " " "\n" | sort -r -n); do
IFS=':' read -r -a t <<< "$strategy_token"
# After which date (relative to today) this token applies (X)
local cut_off_timestamp=$((current_timestamp - ${t[0]} * 86400))
# Every how many days should a backup be kept past the cut off date (Y)
local cut_off_interval=$((${t[1]} * 86400))
# If we've found the strategy token that applies to this backup
if [ "$backup_timestamp" -le "$cut_off_timestamp" ]; then
# Special case: if Y is "0" we delete every time
if [ $cut_off_interval -eq "0" ]; then
fn_expire_backup "$backup_dir"
break
fi
# Check if the current backup is in the interval between
# the last backup that was kept and Y
local interval_since_last_kept=$((last_kept_timestamp - backup_timestamp))
if [ "$interval_since_last_kept" -lt "$cut_off_interval" ]; then
# Yes: Delete that one
fn_expire_backup "$backup_dir"
else
# No: Keep it
last_kept_timestamp=$backup_timestamp
fi
break
fi
done
done
}
fn_parse_ssh() {
# To keep compatibility with bash version < 3, we use grep
if echo "$DEST_FOLDER"|grep -Eq '^[A-Za-z0-9\._%\+\-]+@[A-Za-z0-9.\-]+\:.+$'
then
SSH_USER=$(echo "$DEST_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\1/')
SSH_HOST=$(echo "$DEST_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\2/')
SSH_DEST_FOLDER=$(echo "$DEST_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\3/')
SSH_CMD="ssh -p $SSH_PORT ${SSH_USER}@${SSH_HOST}"
SSH_DEST_FOLDER_PREFIX="${SSH_USER}@${SSH_HOST}:"
elif echo "$SRC_FOLDER"|grep -Eq '^[A-Za-z0-9\._%\+\-]+@[A-Za-z0-9.\-]+\:.+$'
then
SSH_USER=$(echo "$SRC_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\1/')
SSH_HOST=$(echo "$SRC_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\2/')
SSH_SRC_FOLDER=$(echo "$SRC_FOLDER" | sed -E 's/^([A-Za-z0-9\._%\+\-]+)@([A-Za-z0-9.\-]+)\:(.+)$/\3/')
SSH_CMD="ssh -p $SSH_PORT ${SSH_USER}@${SSH_HOST}"
SSH_SRC_FOLDER_PREFIX="${SSH_USER}@${SSH_HOST}:"
fi
}
fn_run_cmd() {
if [ -n "$SSH_DEST_FOLDER_PREFIX" ]
then
eval "$SSH_CMD '$1'"
else
eval $1
fi
}
fn_find() {
fn_run_cmd "find '$1'" 2>/dev/null
}
fn_get_absolute_path() {
fn_run_cmd "cd '$1';pwd"
}
fn_mkdir() {
fn_run_cmd "mkdir -p -- '$1'"
}
# Removes a file or symlink - not for directories
fn_rm_file() {
fn_run_cmd "rm -f -- '$1'"
}
fn_rm_dir() {
fn_run_cmd "rm -rf -- '$1'"
}
fn_touch() {
fn_run_cmd "touch -- '$1'"
}
fn_ln() {
fn_run_cmd "ln -s -- '$1' '$2'"
}
# -----------------------------------------------------------------------------
# Source and destination information
# -----------------------------------------------------------------------------
SSH_USER=""
SSH_HOST=""
SSH_DEST_FOLDER=""
SSH_SRC_FOLDER=""
SSH_CMD=""
SSH_DEST_FOLDER_PREFIX=""
SSH_SRC_FOLDER_PREFIX=""
SSH_PORT="22"
SRC_FOLDER=""
DEST_FOLDER=""
EXCLUSION_FILE=""
LOG_DIR="$HOME/.$APPNAME"
AUTO_DELETE_LOG="1"
EXPIRATION_STRATEGY="1:1 30:7 365:30"
RSYNC_FLAGS="-D --compress --numeric-ids --links --hard-links --one-file-system --itemize-changes --times --recursive --perms --owner --group --stats --human-readable"
while :; do
case $1 in
-h|-\?|--help)
fn_display_usage
exit
;;
-p|--port)
shift
SSH_PORT=$1
;;
--rsync-get-flags)
shift
echo $RSYNC_FLAGS
exit
;;
--rsync-set-flags)
shift
RSYNC_FLAGS="$1"
;;
--strategy)
shift
EXPIRATION_STRATEGY="$1"
;;
--log-dir)
shift
LOG_DIR="$1"
AUTO_DELETE_LOG="0"
;;
--)
shift
SRC_FOLDER="$1"
DEST_FOLDER="$2"
EXCLUSION_FILE="$3"
break
;;
-*)
fn_log_error "Unknown option: \"$1\""
fn_log_info ""
fn_display_usage
exit 1
;;
*)
SRC_FOLDER="$1"
DEST_FOLDER="$2"
EXCLUSION_FILE="$3"
break
esac
shift
done
# Display usage information if required arguments are not passed
if [[ -z "$SRC_FOLDER" || -z "$DEST_FOLDER" ]]; then
fn_display_usage
exit 1
fi
# Strips off last slash from dest. Note that it means the root folder "/"
# will be represented as an empty string "", which is fine
# with the current script (since a "/" is added when needed)
# but still something to keep in mind.
# However, due to this behavior we delay stripping the last slash for
# the source folder until after parsing for ssh usage.
DEST_FOLDER="${DEST_FOLDER%/}"
fn_parse_ssh
if [ -n "$SSH_DEST_FOLDER" ]; then
DEST_FOLDER="$SSH_DEST_FOLDER"
fi
if [ -n "$SSH_SRC_FOLDER" ]; then
SRC_FOLDER="$SSH_SRC_FOLDER"
fi
# Now strip off last slash from source folder.
SRC_FOLDER="${SRC_FOLDER%/}"
for ARG in "$SRC_FOLDER" "$DEST_FOLDER" "$EXCLUSION_FILE"; do
if [[ "$ARG" == *"'"* ]]; then
fn_log_error 'Source and destination directories may not contain single quote characters.'
exit 1
fi
done
# -----------------------------------------------------------------------------
# Check that the destination drive is a backup drive
# -----------------------------------------------------------------------------
# TODO: check that the destination supports hard links
fn_backup_marker_path() { echo "$1/backup.marker"; }
fn_find_backup_marker() { fn_find "$(fn_backup_marker_path "$1")" 2>/dev/null; }
if [ -z "$(fn_find_backup_marker "$DEST_FOLDER")" ]; then
fn_log_info "Safety check failed - the destination does not appear to be a backup folder or drive (marker file not found)."
fn_log_info "If it is indeed a backup folder, you may add the marker file by running the following command:"
fn_log_info ""
fn_log_info_cmd "mkdir -p -- \"$DEST_FOLDER\" ; touch \"$(fn_backup_marker_path "$DEST_FOLDER")\""
fn_log_info ""
exit 1
fi
# -----------------------------------------------------------------------------
# Setup additional variables
# -----------------------------------------------------------------------------
# Date logic
NOW=$(date +"%Y-%m-%d-%H%M%S")
EPOCH=$(date "+%s")
KEEP_ALL_DATE=$((EPOCH - 86400)) # 1 day ago
KEEP_DAILIES_DATE=$((EPOCH - 2678400)) # 31 days ago
export IFS=$'\n' # Better for handling spaces in filenames.
DEST="$DEST_FOLDER/$NOW"
PREVIOUS_DEST="$(fn_find_backups | head -n 1)"
INPROGRESS_FILE="$DEST_FOLDER/backup.inprogress"
MYPID="$$"
# -----------------------------------------------------------------------------
# Create log folder if it doesn't exist
# -----------------------------------------------------------------------------
if [ ! -d "$LOG_DIR" ]; then
fn_log_info "Creating log folder in '$LOG_DIR'..."
mkdir -- "$LOG_DIR"
fi
# -----------------------------------------------------------------------------
# Handle case where a previous backup failed or was interrupted.
# -----------------------------------------------------------------------------
if [ -n "$(fn_find "$INPROGRESS_FILE")" ]; then
if [ "$OSTYPE" == "cygwin" ]; then
# 1. Grab the PID of previous run from the PID file
RUNNINGPID="$(fn_run_cmd "cat $INPROGRESS_FILE")"
# 2. Get the command for the process currently running under that PID and look for our script name
RUNNINGCMD="$(procps -wwfo cmd -p $RUNNINGPID --no-headers | grep "$APPNAME")"
# 3. Grab the exit code from grep (0=found, 1=not found)
GREPCODE=$?
# 4. if found, assume backup is still running
if [ "$GREPCODE" = 0 ]; then
fn_log_error "Previous backup task is still active - aborting (command: $RUNNINGCMD)."
exit 1
fi
else
RUNNINGPID="$(fn_run_cmd "cat $INPROGRESS_FILE")"
if [ "$RUNNINGPID" = "$(pgrep -o -f "$APPNAME")" ]; then
fn_log_error "Previous backup task is still active - aborting."
exit 1
fi
fi
if [ -n "$PREVIOUS_DEST" ]; then
# - Last backup is moved to current backup folder so that it can be resumed.
# - 2nd to last backup becomes last backup.
fn_log_info "$SSH_DEST_FOLDER_PREFIX$INPROGRESS_FILE already exists - the previous backup failed or was interrupted. Backup will resume from there."
fn_run_cmd "mv -- $PREVIOUS_DEST $DEST"
if [ "$(fn_find_backups | wc -l)" -gt 1 ]; then
PREVIOUS_DEST="$(fn_find_backups | sed -n '2p')"
else
PREVIOUS_DEST=""
fi
# update PID to current process to avoid multiple concurrent resumes
fn_run_cmd "echo $MYPID > $INPROGRESS_FILE"
fi
fi
# Run in a loop to handle the "No space left on device" logic.
while : ; do
# -----------------------------------------------------------------------------
# Check if we are doing an incremental backup (if previous backup exists).
# -----------------------------------------------------------------------------
LINK_DEST_OPTION=""
if [ -z "$PREVIOUS_DEST" ]; then
fn_log_info "No previous backup - creating new one."
else
# If the path is relative, it needs to be relative to the destination. To keep
# it simple, just use an absolute path. See http://serverfault.com/a/210058/118679
PREVIOUS_DEST="$(fn_get_absolute_path "$PREVIOUS_DEST")"
fn_log_info "Previous backup found - doing incremental backup from $SSH_DEST_FOLDER_PREFIX$PREVIOUS_DEST"
LINK_DEST_OPTION="--link-dest='$PREVIOUS_DEST'"
fi
# -----------------------------------------------------------------------------
# Create destination folder if it doesn't already exists
# -----------------------------------------------------------------------------
if [ -z "$(fn_find "$DEST -type d" 2>/dev/null)" ]; then
fn_log_info "Creating destination $SSH_DEST_FOLDER_PREFIX$DEST"
fn_mkdir "$DEST"
fi
# -----------------------------------------------------------------------------
# Purge certain old backups before beginning new backup.
# -----------------------------------------------------------------------------
fn_expire_backups
# -----------------------------------------------------------------------------
# Start backup
# -----------------------------------------------------------------------------
LOG_FILE="$LOG_DIR/$(date +"%Y-%m-%d-%H%M%S").log"
fn_log_info "Starting backup..."
fn_log_info "From: $SSH_SRC_FOLDER_PREFIX$SRC_FOLDER/"
fn_log_info "To: $SSH_DEST_FOLDER_PREFIX$DEST/"
CMD="rsync"
if [ -n "$SSH_CMD" ]; then
CMD="$CMD -e 'ssh -p $SSH_PORT -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'"
fi
CMD="$CMD $RSYNC_FLAGS"
CMD="$CMD --log-file '$LOG_FILE'"
if [ -n "$EXCLUSION_FILE" ]; then
# We've already checked that $EXCLUSION_FILE doesn't contain a single quote
CMD="$CMD --exclude-from '$EXCLUSION_FILE'"
fi
CMD="$CMD $LINK_DEST_OPTION"
CMD="$CMD -- '$SSH_SRC_FOLDER_PREFIX$SRC_FOLDER/' '$SSH_DEST_FOLDER_PREFIX$DEST/'"
fn_log_info "Running command:"
fn_log_info "$CMD"
fn_run_cmd "echo $MYPID > $INPROGRESS_FILE"
eval $CMD
# -----------------------------------------------------------------------------
# Check if we ran out of space
# -----------------------------------------------------------------------------
NO_SPACE_LEFT="$(grep "No space left on device (28)\|Result too large (34)" "$LOG_FILE")"
if [ -n "$NO_SPACE_LEFT" ]; then
fn_log_warn "No space left on device - removing oldest backup and resuming."
if [[ "$(fn_find_backups | wc -l)" -lt "2" ]]; then
fn_log_error "No space left on device, and no old backup to delete."
exit 1
fi
fn_expire_backup "$(fn_find_backups | tail -n 1)"
# Resume backup
continue
fi
# -----------------------------------------------------------------------------
# Check whether rsync reported any errors
# -----------------------------------------------------------------------------
EXIT_CODE="1"
if [ -n "$(grep "rsync error:" "$LOG_FILE")" ]; then
fn_log_error "Rsync reported an error. Run this command for more details: grep -E 'rsync:|rsync error:' '$LOG_FILE'"
elif [ -n "$(grep "rsync:" "$LOG_FILE")" ]; then
fn_log_warn "Rsync reported a warning. Run this command for more details: grep -E 'rsync:|rsync error:' '$LOG_FILE'"
else
fn_log_info "Backup completed without errors."
if [[ $AUTO_DELETE_LOG == "1" ]]; then
rm -f -- "$LOG_FILE"
fi
EXIT_CODE="0"
fi
# -----------------------------------------------------------------------------
# Add symlink to last backup
# -----------------------------------------------------------------------------
fn_rm_file "$DEST_FOLDER/latest"
fn_ln "$(basename -- "$DEST")" "$DEST_FOLDER/latest"
fn_rm_file "$INPROGRESS_FILE"
exit $EXIT_CODE
done
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