CVAT抽离容器遇到的问题

1. 安装postgreSQL失败

Collecting psycopg2-binary==2.7.4
  Using cached https://mirrors.aliyun.com/pypi/packages/77/09/4991fcd9a8f4bea1ee3948e1729fa17c184d25bd10809bacc143626361b9/psycopg2-binary-2.7.4.tar.gz (426 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/konkii/pyvirenv/cvat/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-c7_sgpod/psycopg2-binary/setup.py'"'"'; __file__='"'"'/tmp/pip-install-c7_sgpod/psycopg2-binary/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-c7_sgpod/psycopg2-binary/pip-egg-info
         cwd: /tmp/pip-install-c7_sgpod/psycopg2-binary/
    Complete output (23 lines):
    running egg_info
    creating /tmp/pip-install-c7_sgpod/psycopg2-binary/pip-egg-info/psycopg2_binary.egg-info
    writing /tmp/pip-install-c7_sgpod/psycopg2-binary/pip-egg-info/psycopg2_binary.egg-info/PKG-INFO
    writing dependency_links to /tmp/pip-install-c7_sgpod/psycopg2-binary/pip-egg-info/psycopg2_binary.egg-info/dependency_links.txt
    writing top-level names to /tmp/pip-install-c7_sgpod/psycopg2-binary/pip-egg-info/psycopg2_binary.egg-info/top_level.txt
    writing manifest file '/tmp/pip-install-c7_sgpod/psycopg2-binary/pip-egg-info/psycopg2_binary.egg-info/SOURCES.txt'
    
    Error: pg_config executable not found.
    
    pg_config is required to build psycopg2 from source.  Please add the directory
    containing pg_config to the $PATH or specify the full executable path with the
    option:
    
        python setup.py build_ext --pg-config /path/to/pg_config build ...
    
    or with the pg_config option in 'setup.cfg'.
    
    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.
    
    For further information please check the 'doc/src/install.rst' file (also at
    <http://initd.org/psycopg/docs/install.html>).
    
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

解决方案：这个模块是用来调用posrgreSQL的，按提示需要pg_config，可以尝试apt安装，若已安装，则可以使用locate定位到pg_config的路径，使用export PATH=/usr/lib/postgresql/X.Y/bin/:$PATH命令加入PATH
2. 改用MySQL后的字段长度限制
2.1.

  Applying engine.0001_initial...Traceback (most recent call last):
  File "/home/konkii/pyvirenv/cvat/lib/python3.7/site-packages/django/db/backends/utils.py", line 84, in _execute
    return self.cursor.execute(sql, params)
  File "/home/konkii/pyvirenv/cvat/lib/python3.7/site-packages/django/db/backends/mysql/base.py", line 71, in execute
    return self.cursor.execute(query, args)
  File "/home/konkii/pyvirenv/cvat/lib/python3.7/site-packages/MySQLdb/cursors.py", line 209, in execute
    res = self._query(query)
  File "/home/konkii/pyvirenv/cvat/lib/python3.7/site-packages/MySQLdb/cursors.py", line 315, in _query
    db.query(q)
  File "/home/konkii/pyvirenv/cvat/lib/python3.7/site-packages/MySQLdb/connections.py", line 239, in query
    _mysql.connection.query(self, query)
MySQLdb._exceptions.OperationalError: (1071, 'Specified key was too long; max key length is 3072 bytes')

The above exception was the direct cause of the following exception:

解决方案：参考MySQL 经典案例分析：Specified key was too long,
在engine/models.py 中定义的ClientFile模型定义了unique_together属性，会在mysql中创建索引

class ClientFile(models.Model):
    task = models.ForeignKey(Task, on_delete=models.CASCADE)
    file = models.FileField(upload_to=upload_path_handler,
                            max_length=1024, storage=MyFileSystemStorage())
    class Meta:
        default_permissions = ()
        unique_together = ("task", "file")

显然task_id和file的总长度超过了3072字节，所以把file的max_length缩小就可以了。

2.2.

(cvat) [email protected]:~/program/vtag$ python manage.py makemigrations
SystemCheckError: System check identified some issues:

ERRORS:
annotation.AnnotationDumper.display_name: (mysql.E001) MySQL does not allow unique CharFields to have a max_length > 255.
annotation.AnnotationLoader.display_name: (mysql.E001) MySQL does not allow unique CharFields to have a max_length > 255.

解决方案：cvat/apps/annotations/models.py 中的AnnotationHandler类的display_name(primaey_key)字段长度改为255