该命令返回了非零代码：127 [英] The command returned a non-zero code: 127

问题描述

我正在尝试构建下面的Dockerfile，但是在 RUN ocp-indent --help 上说 ocp-indent时，它一直失败找到命令'/ bin / sh -c ocp-indent --help'返回非零代码：127

I'm trying to build the below Dockerfile, but it keeps failing on RUN ocp-indent --help saying ocp-indent: not found The command '/bin/sh -c ocp-indent --help' returned a non-zero code: 127

FROM ocaml/opam

WORKDIR /workdir

RUN opam init --auto-setup
RUN opam install --yes ocp-indent
RUN ocp-indent --help

ENTRYPOINT ["ocp-indent"]
CMD ["--help"]

我通过 docker run -it< image id>撞到了在它之前运行的映像。 bash -il 并运行 ocp-indent --help ，它运行良好。

I bashed into the image that ran before it via docker run -it <image id> bash -il and ran ocp-indent --help and it ran fine. Not sure why it's failing, thoughts?

推荐答案

这是与PATH相关的问题和个人资料。当您使用 sh -c 或 bash -c 时，不会加载配置文件。但是，当您使用 bash -lc 时，这意味着加载配置文件并执行命令。现在，您的个人资料可能已设置了运行此命令的必要路径。

This is a PATH related issue and profile. When you use sh -c or bash -c the profile files are not loaded. But when you use bash -lc it means load the profile and also execute the command. Now your profile may have the necessary path setup to run this command.

Edit-1

因此，原始答案的问题是它不起作用。当我们有

So the issue with the original answer was that it cannot work. When we had

ENTRYPOINT ["/bin/bash", "-lc", "ocp-indent"]
CMD ["--help"]

最终翻译为 / bin / bash -lc ocp-indent --help ，而要使其正常工作，我们需要 / bin / bash -lc ocp-indent --help 。不能直接通过在入口点使用命令来完成此操作。因此，我们需要制作一个新的 entrypoint.sh 文件

It finally translates to /bin/bash -lc ocp-indent --help while for it to work we need /bin/bash -lc "ocp-indent --help". This cannot be done by directly by using command in entrypoint. So we need to make a new entrypoint.sh file

#!/bin/sh -l
ocp-indent "$@"

请确保 chmod + x entrypoint.sh 在主机上。并将Dockerfile更新到以下

Make sure to chmod +x entrypoint.sh on host. And update the Dockerfile to below

FROM ocaml/opam

WORKDIR /workdir

RUN opam init --auto-setup
RUN opam install --yes ocp-indent
SHELL ["/bin/sh", "-lc"]
COPY entrypoint.sh /entrypoint.sh
ENTRYPOINT ["/entrypoint.sh"]
CMD ["--help"]

构建并运行后可以运行

$ docker run f76dda33092a
NAME
       ocp-indent - Automatic indentation of OCaml source files

SYNOPSIS

原始答案

您可以使用以下命令轻松测试两者的区别

You can easily test the difference between both using below commands

docker run -it --entrypoint "/bin/sh" <image id> env
docker run -it --entrypoint "/bin/sh -l" <image id> env
docker run -it --entrypoint "/bin/bash" <image id> env
docker run -it --entrypoint "/bin/bash -l" <image id> env

现在，bash默认情况下具有正确的路径，或者仅当使用<$时才会出现c $ c> -l <​​/ code>标志。在这种情况下，您可以将docker映像的默认外壳更改为以下

Now either you bash has correct path by default or it will only come when you use the -l flag. In that case you can change the default shell of your docker image to below

FROM ocaml/opam

WORKDIR /workdir

RUN opam init --auto-setup
RUN opam install --yes ocp-indent
SHELL ["/bin/bash", "-lc"]
RUN ocp-indent --help

ENTRYPOINT ["/bin/bash", "-lc", "ocp-indent"]
CMD ["--help"]

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