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[英]How can Linux program, e.g. bash or python script, know how it was started: from command line or interactive GUI?
[英]Adding interactive user input e.g., `read` in a Docker container
我想制作一個可以執行以下操作的 Docker 鏡像:
read
獲取用戶輸入並將其存儲在局部變量中使用它,我有以下 Dockerfile:
FROM ubuntu
RUN ["echo", "'Input something: '"]
RUN ["read", "some_var"]
RUN ["echo", "You wrote $some_var!"]
在運行docker build
,會產生以下輸出:
Sending build context to Docker daemon 3.072kB
Step 1/4 : FROM ubuntu
---> 4e2eef94cd6b
Step 2/4 : RUN ["echo", "'Input something: '"]
---> Using cache
---> a9d967721ade
Step 3/4 : RUN ["read", "some_var"]
---> Running in e1c603e2d376
OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"read\": executable file not found in $PATH": unknown
read
似乎是一個內置的 bash “函數”,因為which read
不會產生任何結果。 我取代["read", "some_var"]
與["/bin/bash -c read", "some_var"]
和["/bin/bash", "-c", "read", "some_var"]
,但兩者都產生以下結果:
...
Step 3/4 : RUN ["/bin/bash -c read", "some_var"]
---> Running in 6036267781a4
OCI runtime create failed: container_linux.go:349: starting container process caused "exec: \"/bin/bash -c read\": stat /bin/bash -c read: no such file or directory": unknown
...
Step 3/4 : RUN ["/bin/bash", "-c", "read", "some_var"]
---> Running in 947dda3a9a6c
The command '/bin/bash -c read some_var' returned a non-zero code: 1
此外,我還用RUN read some_var
替換了它,但結果如下:
...
Step 3/4 : RUN read some_var
---> Running in de0444c67386
The command '/bin/sh -c read some_var' returned a non-zero code: 1
誰能幫我這個?
一種解決方案是使用外部 shell 腳本並使用ENTRYPOINT 。
run.sh
:
#!/bin/bash
echo "Input something!"
read some_var
echo "You wrote ${some_var}!"
Dockerfile
內容:
FROM ubuntu
COPY "run.sh" .
RUN ["chmod", "+x", "./run.sh"]
ENTRYPOINT [ "./run.sh" ]
這將允許./run.sh
在容器旋轉時運行:
$ docker build -t test .
Step 1/4 : FROM ubuntu
---> 4e2eef94cd6b
Step 2/4 : COPY "run.sh" .
---> 37225979730d
Step 3/4 : RUN ["chmod", "+x", "./run.sh"]
---> Running in 5f20ded00739
Removing intermediate container 5f20ded00739
---> 41174edb932c
Step 4/4 : ENTRYPOINT [ "./run.sh" ]
---> Running in bed7717c1242
Removing intermediate container bed7717c1242
---> 554da7be7972
Successfully built 554da7be7972
Successfully tagged test:latest
$ docker run -it test
Input something!
Test message
You wrote Test message!
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