Dockerfile OpenApi Generator-CodePudding

I am trying to avoid importing all kinds of dependencies in my docker images (by way of npm or java) so that I can generate a swagger client.

I am using openapitools/openapi-generator-cli but when I try and use it, the command generate isn't found. Here are the docs

Here's what I'm trying to do:

FROM openapitools/openapi-generator-cli
RUN generate

Result:

Step 1/2 : FROM openapitools/openapi-generator-cli
 ---> 62d78bf45d59
Step 2/2 : RUN generate
 ---> Running in accaf10464d5
/bin/sh: 1: generate: not found

However, this works without issue:

docker run openapitools/openapi-generator-cli generate

And by "works" I mean I get positive feedback from the cli that I'm missing the required args.

Being relatively new to this part of Docker, is my understanding incorrect with how FROM should be working here? I think I'm hitting the error because FROM doesn't actually run the container and therefore generator isn't present.

But what confuses me is I do the exact same process with dotnet and it works perfectly fine.

FROM mcr.microsoft.com/dotnet/aspnet:6.0-bullseye-slim
RUN dotnet

Results:

Step 1/2 : FROM mcr.microsoft.com/dotnet/aspnet:6.0-bullseye-slim
 ---> 32aef79fd915
Step 2/2 : RUN dotnet
 ---> Running in 1e6c04d30a82

Usage: dotnet [options]
Usage: dotnet [path-to-application]

Options:
  -h|--help         Display help.
  --info            Display .NET information.
  --list-sdks       Display the installed SDKs.
  --list-runtimes   Display the installed runtimes.

CodePudding user response：

docker run openapitools/openapi-generator-cli generate

works because it's equivalent bash /usr/local/bin/docker-entrypoint.sh generate inside the container

Because from the Dockerfile /usr/local/bin/docker-entrypoint.sh is set as an ENTRYPOINT, for you case check docker-entrypoint.sh from the github repo and grasp the logic on what happens when you pass generate, or simply do

FROM openapitools/openapi-generator-cli
RUN bash /usr/local/bin/docker-entrypoint.sh generate