为什么apt-key adv命令会给出错误？

Question

这是一个Dockerfile的片段，它显示了一个我不理解的错误：

FROM dorowu/ubuntu-desktop-lxde-vnc
LABEL maintainer "bpinaya@wpi.edu"

# Adding keys for ROS
RUN sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'
RUN apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116

给出了这个结果

RUN apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
 ---> Running in 7bb30729ec87
Warning: apt-key output should not be parsed (stdout is not a terminal)
Executing: /tmp/apt-key-gpghome.HkofyyhjvI/gpg.1.sh --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
gpg: failed to start the dirmngr '/usr/bin/dirmngr': No such file or directory
gpg: connecting dirmngr at '/tmp/apt-key-gpghome.HkofyyhjvI/S.dirmngr' failed: No such file or directory
gpg: keyserver receive failed: No dirmngr
The command '/bin/sh -c apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116' returned a non-zero code: 2

Answer 1

根据这篇文章的here，你需要安装dirmngr。我还需要安装gnupg，以便在测试时在我本地的docker容器上工作。

我用我的更改更新了下面的Dockerfile代码：

FROM dorowu/ubuntu-desktop-lxde-vnc
LABEL maintainer "bpinaya@wpi.edu"

# Update
RUN apt-get update && \
  apt-get upgrade -y

# Install required packages
RUN apt-get install -y \
  dirmngr \
  gnupg

# Adding keys for ROS
RUN sh -c 'echo "deb http://packages.ros.org/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-latest.list'

RUN apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116

在最后一步中，我得到了以下输出：

Step 6/6 : RUN apt-key adv --keyserver hkp://pgp.mit.edu:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
 ---> Running in a0cfb3588173
Warning: apt-key output should not be parsed (stdout is not a terminal)
Executing: /tmp/apt-key-gpghome.USze27holj/gpg.1.sh --keyserver hkp://pgp.mit.edu:80 --recv-key 421C365BD9FF1F717815A3895523BAEEB01FA116
gpg: key 5523BAEEB01FA116: public key "ROS Builder <rosbuild@ros.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1

有时，此报告会返回以下错误：

gpg: keyserver receive failed: Cannot assign requested address

这个错误看起来并不一致，所以可能是我自己的网络连接造成的。

Answer 2

我想发表评论，但没有足够的名气。请考虑我的回答作为@brian-elliott回答的附录。Dirmngr似乎有一些奇怪的默认设置来使用tor或一些非标准DNS。所以请确保你有这样的设置：

standard-resolver
keyserver keyserver.ubuntu.com
keyserver keys.gnupg.net

在你的~/.gnupg/dirmngr.conf目录中