borgextend/plugins/mysql.py

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2019-06-05 21:47:31 -04:00
import copy
import os
import re
import subprocess
import warnings
_mysql_ssl_re = re.compile('^ssl-(.*)$')
# TODO: is it possible to do a pure-python dump via PyMySQL?
# TODO: add compression support? Not *that* necessary since borg has its own.
# in fact, it's better to not do it on the dumps directly so borg can diff/delta better.
class Backup(object):
def __init__(self, dbs = None,
cfg = '~/.my.cnf',
cfgsuffix = '',
splitdumps = True,
dumpopts = None,
mysqlbin = 'mysql',
mysqldumpbin = 'mysqldump',
outdir = '~/.cache/backup/mysql'):
# If dbs is None, we dump ALL databases (that the user has access to).
self.dbs = dbs
self.cfgsuffix = cfgsuffix
self.splitdumps = splitdumps
self.mysqlbin = mysqlbin
self.mysqldumpbin = mysqldumpbin
self.outdir = os.path.abspath(os.path.expanduser(outdir))
self.cfg = os.path.abspath(os.path.expanduser(cfg))
os.makedirs(self.outdir, exist_ok = True)
os.chmod(self.outdir, mode = 0o0700)
if not os.path.isfile(self.cfg):
raise OSError(('{0} does not exist!').format(self.cfg))
if not dumpopts:
self.dumpopts = ['--routines',
'--add-drop-database',
'--add-drop-table',
'--allow-keywords',
'--complete-insert',
'--create-options',
'--extended-insert']
else:
self.dumpopts = dumpopts
self.getDBs()
self.dump()
def getDBs(self):
if not self.dbs:
_out = subprocess.run([self.mysqlbin, '-BNne', 'SHOW DATABASES'],
stdout = subprocess.PIPE,
stderr = subprocess.PIPE)
if _out.returncode != 0:
raise RuntimeError(('Could not successfully list databases: '
'{0}').format(_out.stderr.decode('utf-8')))
self.dbs = _out.stdout.decode('utf-8').strip().splitlines()
return()
def dump(self):
if self.splitdumps:
for db in self.dbs:
args = copy.deepcopy(self.dumpopts)
outfile = os.path.join(self.outdir, '{0}.sql'.format(db))
if db in ('information_schema', 'performance_schema'):
args.append('--skip-lock-tables')
elif db == 'mysql':
args.append('--flush-privileges')
cmd = [self.mysqldumpbin,
'--result-file={0}'.format(outfile)]
cmd.extend(args)
cmd.append(db)
out = subprocess.run(cmd,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE)
if out.returncode != 0:
warn = ('Error dumping {0}: {1}').format(db, out.stderr.decode('utf-8').strip())
warnings.warn(warn)
else:
outfile = os.path.join(self.outdir, 'all.databases.sql')
args = copy.deepcopy(self.dumpopts)
args.append('--result-file={0}'.format(outfile))
if 'information_schema' in self.dbs:
args.append('--skip-lock-tables')
if 'mysql' in self.dbs:
args.append('--flush-privileges')
args.append(['--databases'])
cmd = [self.mysqldumpbin]
cmd.extend(args)
cmd.extend(self.dbs)
out = subprocess.run(cmd,
stdout = subprocess.PIPE,
stderr = subprocess.PIPE)
if out.returncode != 0:
warn = ('Error dumping {0}: {1}').format(','.join(self.dbs),
out.stderr.decode('utf-8').strip())
warnings.warn(warn)
return()