问题:如何将 ARG 传递给 docker-compose.yml 中的 Dockerfile

我有一个具有以下(简化)结构的项目apkmirror-scraper-compose:

.
├── docker-compose.yml
└── tor
    └── Dockerfile

docker-compose.yml是

version: '3'

services: 
  tor:
    build:
      context: ./tor
      args:
        password: ""
    ports:
      - "9050:9050"
      - "9051:9051"

tor目录下的Dockerfile为:

FROM alpine:latest
EXPOSE 9050 9051
ARG password
RUN apk --update add tor
RUN echo "ControlPort 9051" >> /etc/tor/torrc
RUN echo "HashedControlPassword $(tor --quiet --hash-password $password)" >> /etc/tor/torrc
CMD ["tor"]

我正在尝试将参数password作为值""(一个空字符串)传递给Dockerfile,以便它可以使用 Tor 对其进行哈希处理并将HashedControlPassword行添加到配置文件中(参见https:// www.torproject.org/docs/tor-manual.html.en)。

但是,如果我docker-compose build后跟docker-compose up,则日志包含以下内容:

Creating network "apkmirrorscrapercompose_default" with the default driver
Starting apkmirrorscrapercompose_tor_1
Attaching to apkmirrorscrapercompose_tor_1
tor_1  | May 02 08:03:59.344 [notice] Tor v0.2.8.12 running on Linux with Libevent 2.0.22-stable, OpenSSL LibreSSL 2.4.4 and Zlib 1.2.8.
tor_1  | May 02 08:03:59.345 [notice] Tor can't help you if you use it wrong! Learn how to be safe at https://www.torproject.org/download/download#warning
tor_1  | May 02 08:03:59.345 [notice] Read configuration file "/etc/tor/torrc".
tor_1  | May 02 08:03:59.349 [warn] Linelist option 'HashedControlPassword' has no value. Skipping.
tor_1  | May 02 08:03:59.349 [warn] ControlPort is open, but no authentication method has been configured.  This means that any program on your computer can reconfigure your Tor.  That's bad!  You should upgrade your Tor controller as soon as possible.

换句话说,password参数没有被“接受”:Tor 说它“没有价值”。但是,与https://docs.docker.com/compose/compose-file/#args上的示例相比,我看不出docker-compose.yml或Dockerfile有什么问题。

谁能发现问题所在?

解答

我相信问题在于password是一个空字符串。如果我用"foo"替换它,docker-compose up似乎可以按预期工作。