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david_wobrock committed 2017-09-04 17:13:32 +02:00
1 parent e00c18fee3
commit 6b1bba6326
1 file changed
+122 -42
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migration_linter.py
+122 -42
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@@ -23,20 +23,26 @@ import sys
def has_default(sql, **kwargs):
if re.search('SET DEFAULT', sql) and kwargs['errors']:
err = next(err for err in kwargs['errors'] if err['code'] == 'NOT_NULL')
err = next(err
for err in kwargs['errors']
if err['code'] == 'NOT_NULL')
if err:
log.info('Found a NOT_NULL error in migration, but it has a default value added: {}'.format(err))
log.info(
('Found a NOT_NULL error in migration, '
'but it has a default value added: {}').format(err))
kwargs['errors'].remove(err)
return False # Never fails
class MigrationLinter:
MIGRATION_FOLDER_NAME = 'migrations'
migration_tests = (
{
'code': 'NOT_NULL',
'fn': lambda sql, **kw: re.search('NOT NULL', sql) and not re.search('CREATE TABLE', sql),
'fn': lambda sql, **kw: re.search('NOT NULL', sql) and
not re.search('CREATE TABLE', sql),
'err_msg': 'NOT NULL constraint on columns'
}, {
'code': 'DROP_COLUMN',
@@ -44,11 +50,13 @@ class MigrationLinter:
'err_msg': 'DROPPING columns'
}, {
'code': 'RENAME_COLUMN',
'fn': lambda sql, **kw: re.search('ALTER TABLE .* CHANGE', sql) or re.search('ALTER TABLE .* RENAME COLUMN', sql), # mysql or postgre
'fn': lambda sql, **kw: re.search('ALTER TABLE .* CHANGE', sql) or
re.search('ALTER TABLE .* RENAME COLUMN', sql),
'err_msg': 'RENAMING columns'
}, {
'code': 'RENAME_TABLE',
'fn': lambda sql, **kw: re.search('RENAME TABLE', sql) or re.search('ALTER TABLE .* RENAME TO', sql), # mysql or postgre
'fn': lambda sql, **kw: re.search('RENAME TABLE', sql) or
re.search('ALTER TABLE .* RENAME TO', sql),
'err_msg': 'RENAMING tables'
}, {
'code': '',
@@ -72,7 +80,8 @@ class MigrationLinter:
def _gather_migrations(self):
# Find (one of) the initial commits
if not self.commit_id:
git_init_cmd = 'cd {0} && git rev-list HEAD | tail -n 1'.format(self.location)
git_init_cmd = 'cd {0} && git rev-list HEAD | tail -n 1'.format(
self.location)
process = Popen(git_init_cmd, shell=True, stdout=PIPE, stderr=PIPE)
for line in process.stdout.readlines():
self.commit_id = line.strip()
@@ -81,19 +90,25 @@ class MigrationLinter:
log.info('Operating until git identifier {0}'.format(self.commit_id))
# Get changes since specified commit
git_diff_command = 'cd {0} && git diff --name-only {1}'.format(self.location, self.commit_id)
git_diff_command = 'cd {0} && git diff --name-only {1}'.format(
self.location, self.commit_id)
log.info('Executing {0}'.format(git_diff_command))
diff_process = Popen(git_diff_command, shell=True, stdout=PIPE, stderr=PIPE)
diff_process = Popen(
git_diff_command, shell=True, stdout=PIPE, stderr=PIPE)
for line in diff_process.stdout.readlines():
# Only gather lines that include migrations
if re.search('\/{0}\/.*\.py'.format(self.MIGRATION_FOLDER_NAME), line) and '__init__' not in line:
if re.search(
'\/{0}\/.*\.py'.format(self.MIGRATION_FOLDER_NAME),
line) and \
'__init__' not in line:
self.changed_migration_files.append(line.strip())
diff_process.wait()
if diff_process.returncode != 0:
output = []
for line in diff_process.stderr.readlines():
output.append(line)
log.info("Error while git diff command:\n{}".format("".join(output)))
log.info("Error while git diff command:\n{}".format(
"".join(output)))
raise Exception('Error while executing git diff command')
def lint_migrations(self):
@@ -107,10 +122,13 @@ class MigrationLinter:
print('IGNORE')
nb_ignore += 1
else:
sql_statements = self.django_sqlmigrate(app_name, migration_name)
sql_statements = self.django_sqlmigrate(
app_name, migration_name)
errors = []
for statement in sql_statements:
is_valid, err = self._test_sql_statement_for_backward_incompatibility(statement, errors)
is_valid, err = \
self._test_sql_statement_for_backward_incompatibility(
statement, errors)
if not is_valid:
errors.append(err)
if not errors:
@@ -124,11 +142,18 @@ class MigrationLinter:
if err['table']:
error_str += ' (table: {0}'.format(err['table'])
if err['column']:
error_str += ', column: {0}'.format(err['column'])
error_str += ', column: {0}'.format(
err['column'])
error_str += ')'
print(error_str)
print('*** Summary:')
print('Valid migrations: {0}/{1} - erroneous migrations: {2}/{1} - ignored migrations: {3}/{1}'.format(nb_valid, len(self.changed_migration_files), nb_erroneous, nb_ignore))
print(('Valid migrations: {0}/{1} - '
'erroneous migrations: {2}/{1} - '
'ignored migrations: {3}/{1}').format(
nb_valid,
len(self.changed_migration_files),
nb_erroneous,
nb_ignore))
return nb_erroneous > 0
@classmethod
@@ -136,21 +161,30 @@ class MigrationLinter:
decomposed_path = split_path(migration_path)
for i, p in enumerate(decomposed_path):
if p == cls.MIGRATION_FOLDER_NAME:
return decomposed_path[i-1], os.path.splitext(decomposed_path[i+1])[0]
return (decomposed_path[i-1],
os.path.splitext(decomposed_path[i+1])[0])
def should_ignore_migration(self, app_name, migration_name):
return (self.include_apps and app_name not in self.include_apps)\
or (self.exclude_apps and app_name in self.exclude_apps)\
or (self.ignore_name_contains and self.ignore_name_contains in migration_name)\
return (self.include_apps and
app_name not in self.include_apps)\
or (self.exclude_apps and
app_name in self.exclude_apps)\
or (self.ignore_name_contains and
self.ignore_name_contains in migration_name)\
or (migration_name in self.ignore_name)
def django_sqlmigrate(self, app_name, migration_name):
git_diff_command = 'cd {0} && python manage.py sqlmigrate {1} {2} --database {3}'.format(self.location, app_name, migration_name, self.database)
git_diff_command = (
'cd {0} && '
'python manage.py sqlmigrate {1} {2} '
'--database {3}').format(
self.location, app_name, migration_name, self.database)
log.info('Executing {0}'.format(git_diff_command))
diff_process = Popen(git_diff_command, shell=True, stdout=PIPE, stderr=PIPE)
diff_process = Popen(
git_diff_command, shell=True, stdout=PIPE, stderr=PIPE)
sql_statements = []
for line in diff_process.stdout.readlines():
if not line.startswith('--'): # Do not take sql comments into account
if not line.startswith('--'): # Ignore comments
sql_statements.append(line.strip())
diff_process.wait()
if diff_process.returncode != 0:
@@ -158,12 +192,15 @@ class MigrationLinter:
log.info('Found {0} sql migration lines'.format(len(sql_statements)))
return sql_statements
def _test_sql_statement_for_backward_incompatibility(self, sql_statement, errors):
def _test_sql_statement_for_backward_incompatibility(
self, sql_statement, errors):
for test in self.migration_tests:
if test['fn'](sql_statement, errors=errors):
log.info('Testing {0} -- ERROR'.format(sql_statement))
table_search = re.search('TABLE `([^`]*)`', sql_statement, re.IGNORECASE)
col_search = re.search('COLUMN `([^`]*)`', sql_statement, re.IGNORECASE)
table_search = re.search(
'TABLE `([^`]*)`', sql_statement, re.IGNORECASE)
col_search = re.search(
'COLUMN `([^`]*)`', sql_statement, re.IGNORECASE)
err = {
'err_msg': test['err_msg'],
'code': test['code'],
@@ -185,11 +222,13 @@ def valid_folder(folder):
return False
django_manage_file = os.path.join(folder, 'manage.py')
if not os.path.isfile(django_manage_file):
print("The passed folder doesn't seem to be a django project (no manage.py found).")
print(("The passed folder doesn't seem to be a "
"django project (no manage.py found)."))
return False
git_folder = os.path.join(folder, '.git')
if not os.path.isdir(git_folder):
print("The passed folder doesn't seem to versioned by git (no .git/ folder found).")
print(("The passed folder doesn't seem to be "
"versioned by git (no .git/ folder found)."))
return False
return True
@@ -200,16 +239,55 @@ def split_path(path):
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Detect backward incompatible django migrations.')
parser.add_argument('django_folder', metavar='DJANGO_FOLDER', type=str, nargs=1, help='the path to the django project')
parser.add_argument('commit_id', metavar='GIT_COMMIT_ID', type=str, nargs='?', help='if specified, only migrations since this commit will be taken into account. If not specified, the initial repo commit will be used')
parser.add_argument('--ignore-name-contains', type=str, nargs='?', help='ignore migrations containing this name')
parser.add_argument('--ignore-name', type=str, nargs='*', help='ignore migrations with exactly one of these names')
parser.add_argument('--verbose', '-v', action='store_true', help='print more information during execution')
parser.add_argument('--database', type=str, nargs='?', help='specify the database for which to generate the SQL. Defaults to default')
incl_excl_group = parser.add_mutually_exclusive_group(required=False)
incl_excl_group.add_argument('--include-apps', type=str, nargs='*', help='check only migrations that are in the specified django apps')
incl_excl_group.add_argument('--exclude-apps', type=str, nargs='*', help='ignore migrations that are in the specified django apps')
parser = argparse.ArgumentParser(
description='Detect backward incompatible django migrations.')
parser.add_argument(
'django_folder',
metavar='DJANGO_FOLDER',
type=str,
nargs=1,
help='the path to the django project')
parser.add_argument(
'commit_id',
metavar='GIT_COMMIT_ID',
type=str, nargs='?',
help=('if specified, only migrations since this commit '
'will be taken into account. If not specified, '
'the initial repo commit will be used'))
parser.add_argument(
'--ignore-name-contains',
type=str,
nargs='?',
help='ignore migrations containing this name')
parser.add_argument(
'--ignore-name',
type=str,
nargs='*',
help='ignore migrations with exactly one of these names')
parser.add_argument(
'--verbose',
'-v',
action='store_true',
help='print more information during execution')
parser.add_argument(
'--database',
type=str,
nargs='?',
help=('specify the database for which to generate the SQL. '
'Defaults to default'))
incl_excl_group = parser.add_mutually_exclusive_group(
required=False)
incl_excl_group.add_argument(
'--include-apps',
type=str,
nargs='*',
help='check only migrations that are in the specified django apps')
incl_excl_group.add_argument(
'--exclude-apps',
type=str,
nargs='*',
help='ignore migrations that are in the specified django apps')
args = parser.parse_args()
if args.verbose:
@@ -219,12 +297,14 @@ if __name__ == '__main__':
folder_name = args.django_folder[0]
if valid_folder(folder_name):
linter = MigrationLinter(folder_name, args.commit_id,
ignore_name_contains=args.ignore_name_contains,
ignore_name=args.ignore_name,
include_apps=args.include_apps,
exclude_apps=args.exclude_apps,
database=args.database)
linter = MigrationLinter(
folder_name,
args.commit_id,
ignore_name_contains=args.ignore_name_contains,
ignore_name=args.ignore_name,
include_apps=args.include_apps,
exclude_apps=args.exclude_apps,
database=args.database)
has_errors = linter.lint_migrations()
if has_errors:
sys.exit(1)