def create_base_backup(destination,backup_name,is_remote):
"""creates a base backup folder, which is just a
hardlinked copy of the previous backup, when existing
"""
print(colored("looking for last backup as base ...","green"))
folders = util.backup_folder_list(destination)
# only if there was one folder copy
if folders:
# last backup is the last element in the sorted list
last_backup = folders[-1]
if last_backup == backup_name or last_backup+".part" == backup_name:
print(colored("backup with current timestamp already exists\n\
are you trying, to backup more than one time per second?","red"))
sys.exit(1)
print("using last backup: {}".format(last_backup))
if util.is_remote(destination):
os.system("ssh {} cp -al {} {}"\
.format(\
get_remote_login(destination),\
os.path.join(get_remote_path(destination),last_backup),\
os.path.join(get_remote_path(destination),backup_name)))
else:
# https://stackoverflow.com/questions/10778229/recursively-creating-hardlinks-using-python
shutil.copytree(
os.path.join(destination,last_backup),
os.path.join(destination,backup_name),
copy_function=os.link)
else:
print("no last backup found")
def start(source,destination):
today = time.strftime("%Y_%m_%d_%H%M%S")
logfile = destination + today + ".log"
backupfolder_partial = today+".part"
backupfolder_full = today
if util.is_remote(destination):
create_base_backup(destination,backupfolder_partial,is_remote=True)
print(colored("starting backup ...","green"))
rsync_command = get_rsync_command(source,os.path.join(destination,backupfolder_partial))
# https://unix.stackexchange.com/questions/34273/can-i-pipe-stdout-on-one-server-to-stdin-on-another-server
result = os.system("{} | ssh {} tee -a {}"
.format(
rsync_command,
get_remote_login(destination),
os.path.join(get_remote_path(destination),today+".log")))
if result != 0:
print(colored("backup failed; rsync returned {}".format(result),"red"))
sys.exit(1)
else:
# rename the partial folder name to the full name at the end
os.system("ssh {} mv '{}' '{}'"
.format(
get_remote_login(destination),
os.path.join(get_remote_path(destination),backupfolder_partial),
os.path.join(get_remote_path(destination),backupfolder_full)
))
else:
create_base_backup(destination,backupfolder_partial,is_remote=False)
print(colored("starting backup ...","green"))
rsync_command = get_rsync_command(source,os.path.join(destination,backupfolder_partial))
result = os.system("{} | tee -a {}".format(rsync_command,logfile) )
if result != 0:
print(colored("backup failed; rsync returned {}".format(result),"red"))
sys.exit(1)
else:
# rename the partial folder name to the full name at the end
os.rename(os.path.abspath(os.path.join(destination,backupfolder_partial)),
os.path.abspath(os.path.join(destination,backupfolder_full)))
print(colored("backup finished!","green"))
