# ----------------------------------------------------------------
# Makefile for doing easy backup using rsync in TimeMachine style
# ----------------------------------------------------------------
# Author :  Alexandre Norman
# Date :    06.10.2015
# Version : v1.0.4
# License : GPL v3
# ----------------------------------------------------------------

# ----------------------------------------------------------------
REMOTE_HOST = $(shell grep REMOTE_HOST configuration.txt|cut -d= -f2)
WHAT_TO_SAVE = $(shell grep WHAT_TO_SAVE configuration.txt|cut -d= -f2)
DESTINATION =  $(shell grep DESTINATION configuration.txt|cut -d= -f2)
EXCLUSION   =  $(shell grep EXCLUSION configuration.txt|cut -d= -f2)
DATABASE_OPTIONS = $(shell grep DATABASE_OPTIONS configuration.txt|cut -d= -f2)
# ----------------------------------------------------------------


TARGET      =  $(shell echo backup_`date +%Y%m%d-%H%M%S`)
FANION      =  $(DESTINATION)/.fanion_backup

# rsync options
RSYNC_ARGS  = -rlptDvog -q --copy-unsafe-links

# Directory name for databases backups
DB_BACKUPDIR = MySql_backup


# this returns directory part without leading /
# example :
#   /home/xael -> returns home/xael
#   xael@localhost:/home/xael -> returns home/xael
DDIR     = `echo $@|cut -d'/' -f2-`

# this returns a / if destination is a directory, else nothing
DIRS_NEED_SLASH = $(shell /bin/bash -c 'if [ "`file $@ |cut -d" " -f2`" == "directory" ];then echo "/"; else echo ""; fi')

# Databases to save
ifneq ($(DATABASE_OPTIONS), NONE)
ifeq ($(REMOTE_HOST),localhost)
DB_NAMES = $(shell /bin/bash -c "echo 'show databases;'|mysql $(DATABASE_OPTIONS) -s -r" 2> /dev/null)
else
DB_NAMES = $(shell ssh $(REMOTE_HOST)  "/bin/bash -c \"echo 'show databases;'|mysql $(DATABASE_OPTIONS) -s -r\"")
endif
endif


# Default : display doc
all:
	@echo "---------------------------------------------------------------"
	@echo "Makefile for doing backup"
	@echo "---------------------------------------------------------------"
	@echo "Usage : "
	@echo "  make backup [TARGET=backup_date-hour]"
	@echo "  make files [TARGET=backup_date-hour]"
	@echo "  make databases [TARGET=backup_date-hour]"
	@echo ""
	@echo "  backup : save both files and databases"
	@echo "  files : save only files"
	@echo "  databases : save only databases"
	@echo ""
	@echo "  fanionCheck : check if last backup is older than 31 days"
	@echo "---------------------------------------------------------------"

# Organize backup
backup: check
	@echo "---------------------------------------------------------------"
	@echo "Begining backup - `date`"
	@make -f $(lastword $(MAKEFILE_LIST)) fanionEC
	@echo "---------------------------------------------------------------"
	@echo "TARGET Directory $(DESTINATION)/${TARGET}"
	@make -f $(lastword $(MAKEFILE_LIST)) files TARGET=$(TARGET)
ifneq ($(DATABASE_OPTIONS), NONE)
	@make -f $(lastword $(MAKEFILE_LIST)) databases TARGET=$(TARGET)
endif
	@make -f $(lastword $(MAKEFILE_LIST)) link TARGET=$(TARGET)
	@echo "---------------------------------------------------------------"
	@make -f $(lastword $(MAKEFILE_LIST)) fanionOK
	@echo "Terminated - `date`"
	@echo "---------------------------------------------------------------"


# backup files
files: check
	@make -f $(lastword $(MAKEFILE_LIST)) $(WHAT_TO_SAVE) TARGET=$(TARGET)

# Check if the destination is available
check:
	@echo "---------------------------------------------------------------"
	@echo "Checking $(DESTINATION) availability"
	@ls $(DESTINATION) >/dev/null 2>&1


# Rule to save a directory or a file
$(WHAT_TO_SAVE):
	@echo "---------------------------------------------------------------"
ifeq ($(REMOTE_HOST),localhost)
	@echo "Saving : $@$(DIRS_NEED_SLASH)"
else
	@echo "Saving : $(REMOTE_HOST):$@$(DIRS_NEED_SLASH)"
endif
	@echo "  destination : $(DESTINATION)/$(TARGET)/${DDIR}"
	@echo "  linking to : $(DESTINATION)/current/${DDIR}"
	@mkdir -p $(DESTINATION)/$(TARGET)/$(DDIR)
ifeq ($(REMOTE_HOST),localhost)
	@rsync $(RSYNC_ARGS) --delete --exclude-from=$(EXCLUSION) --link-dest=$(DESTINATION)/current/${DDIR} $@$(DIRS_NEED_SLASH) $(DESTINATION)/$(TARGET)/${DDIR}
else
	@rsync $(RSYNC_ARGS) --delete --exclude-from=$(EXCLUSION) --link-dest=$(DESTINATION)/current/${DDIR} $(REMOTE_HOST):$@$(DIRS_NEED_SLASH) $(DESTINATION)/$(TARGET)/${DDIR}
endif

# Make a link to current directory
link:
	@echo "---------------------------------------------------------------"
	@echo "Assigning current to $(DESTINATION)/$(TARGET)"
	@rm -f $(DESTINATION)/current
	@ln -s $(DESTINATION)/$(TARGET) $(DESTINATION)/current



# Backup databases
databases: check
	@echo "---------------------------------------------------------------"
	@echo "Saving Mysql Databases"
	@make -f $(lastword $(MAKEFILE_LIST)) $(DB_NAMES) TARGET=$(TARGET)

$(DB_NAMES):
	@echo "  Saving database : $@"
	@mkdir -p $(DESTINATION)/$(TARGET)/$(DB_BACKUPDIR)
ifeq ($(REMOTE_HOST),localhost)
	@mysqldump $(DATABASE_OPTIONS) --single-transaction $@ |gzip -9 -c > $(DESTINATION)/$(TARGET)/$(DB_BACKUPDIR)/$@.sql.gz
else
	@ssh $(REMOTE_HOST) "mysqldump $(DATABASE_OPTIONS) --single-transaction $@ |gzip -9 -c" > $(DESTINATION)/$(TARGET)/$(DB_BACKUPDIR)/$@.sql.gz
endif




# touch EC
fanionEC: fanionRaz
	@echo "---------------------------------------------------------------"
	@echo "Touching $(FANION).ec"
	@touch $(FANION).ec

# touch OK
fanionOK: fanionRaz
	@echo "---------------------------------------------------------------"
	@echo "Touching $(FANION).ok"
	@touch $(FANION).ok

# clean fanion
fanionRaz:
	@rm -f $(FANION).*

# check that fanion is less than 1 month old
fanionCheck:
	@find $(FANION).ok -mtime -31 |grep $(FANION)>/dev/null 2>&1




# reset defaul rules
.SUFFIXES:

.PHONY: check backup files databases $(WHAT_TO_SAVE) $(DB_NAMES)

# --<EOF>---------------------------------------------------------