Scap complained today during train:
```
[zfilipin@deploy1001 ~]$ ./release/bin/deploy-promote
...
sync-pull-masters: 100% (ok: 1; fail: 0; left: 0)
13:14:08 Finished sync-pull-masters (duration: 00m 07s)
13:14:08 Started sync-check-canaries
13:14:19 ['/usr/bin/scap', 'pull', '--no-update-l10n', 'deploy2001.codfw.wmnet', 'deploy1001.eqiad.wmnet', 'deploy1001.eqiad.wmnet'] on mwdebug1001.eqiad.wmnet returned [70]: 13:14:09 Copying from deploy1001.eqiad.wmnet to mwdebug1001.eqiad.wmnet
13:14:09 Started rsync common
cannot delete non-empty directory: php-1.33.0-wmf.23/cache/l10n
cannot delete non-empty directory: php-1.33.0-wmf.23/cache/l10n
cannot delete non-empty directory: php-1.33.0-wmf.23/cache
cannot delete non-empty directory: php-1.33.0-wmf.23/cache
cannot delete non-empty directory: php-1.33.0-wmf.23
cannot delete non-empty directory: docroot/wwwportal/.well-known/matrix
cannot delete non-empty directory: docroot/wwwportal/.well-known
rsync: delete_file: unlink(docroot/wwwportal/.well-known/matrix/client) failed: Permission denied (13)
rsync: delete_file: rmdir(docroot/wwwportal/.well-known/matrix) failed: Permission denied (13)
rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1668) [generator=3.1.2]
13:14:19 Finished rsync common (duration: 00m 10s)
13:14:19 Unhandled error:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/scap/cli.py", line 342, in run
exit_status = app.main(app.extra_arguments)
File "/usr/lib/python2.7/dist-packages/scap/main.py", line 715, in main
rsync_args=rsync_args
File "/usr/lib/python2.7/dist-packages/scap/utils.py", line 402, in context_wrapper
return func(*args, **kwargs)
File "/usr/lib/python2.7/dist-packages/scap/tasks.py", line 401, in sync_common
subprocess.check_call(rsync)
File "/usr/lib/python2.7/subprocess.py", line 186, in check_call
raise CalledProcessError(retcode, cmd)
CalledProcessError: Command '['sudo', '-u', 'mwdeploy', '-n', '--', '/usr/bin/rsync', '--archive', '--delete-delay', '--delay-updates', '--compress', '--delete', '--exclude=**/cache/l10n/*.cdb', '--exclude=*.swp', '--no-perms', '--exclude=**/.git', 'deploy1001.eqiad.wmnet::common', '/srv/mediawiki']' returned non-zero exit status 23
13:14:19 pull failed: <CalledProcessError> Command '['sudo', '-u', 'mwdeploy', '-n', '--', '/usr/bin/rsync', '--archive', '--delete-delay', '--delay-updates', '--compress', '--delete', '--exclude=**/cache/l10n/*.cdb', '--exclude=*.swp', '--no-perms', '--exclude=**/.git', 'deploy1001.eqiad.wmnet::common', '/srv/mediawiki']' returned non-zero exit status 23
check-canaries: 100% (ok: 10; fail: 1; left: 0)
13:15:04 1 canaries had sync errors
13:15:04 Finished Canaries Synced (duration: 00m 55s)
...
Scap finished, there were no problems.