如何生成 docker 镜像时包含应用当前的 git commit hash

Question

为了随时能够知道当前运行的应用容器对应的是 git 仓库中哪个 commit ，想在 Dockerfile 生产镜像时将当前的 git commit hash 包含进去，请问如何实现？

Answer 1

使用dockerfile的env或者label指令，在build的时候传递过去。

FROM alpine

ARG GIT_COMMIT=0
ENV GIT_COMMIT=${GIT_COMMIT}
LABEL GIT_COMMIT=${GIT_COMMIT}

docker build --file .\alpine.dockerfile  --tag test --build-arg  GIT_COMMIT=$(git rev-parse HEAD) .

效果：

$ docker inspect test
[ 
    {
        "Id": "sha256:ae0b8e8940df391f35fd9119a981019a0c174b54a51225c9001a8b9536a90ec9",
        "RepoTags": [
            "test:latest"
        ],
        "RepoDigests": [],
        "Parent": "sha256:3b3cda3111fa9895127e271e15c890295102427948d746dbd8148e44e518096f",
        "Comment": "",
        "Created": "2019-05-12T09:34:12.929395544Z",
        "Container": "f27852e7a76275570a3c2e42b365249b85961eabba892cb16636367a108464d0",
        "ContainerConfig": {
            "Hostname": "f27852e7a762",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "GIT_COMMIT=b14fd66b44180a9b8dd2bce98417699424d08fbb"
            ],
            "Cmd": [
                "/bin/sh",
                "-c",
                "#(nop) ",
                "LABEL GIT_COMMIT=b14fd66b44180a9b8dd2bce98417699424d08fbb"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:3b3cda3111fa9895127e271e15c890295102427948d746dbd8148e44e518096f",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "GIT_COMMIT": "b14fd66b44180a9b8dd2bce98417699424d08fbb"
            }
        },
        "DockerVersion": "18.09.5",
        "Author": "",
        "Config": {
            "Hostname": "",
            "Domainname": "",
            "User": "",
            "AttachStdin": false,
            "AttachStdout": false,
            "AttachStderr": false,
            "Tty": false,
            "OpenStdin": false,
            "StdinOnce": false,
            "Env": [
                "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
                "GIT_COMMIT=b14fd66b44180a9b8dd2bce98417699424d08fbb"
            ],
            "Cmd": [
                "/bin/sh"
            ],
            "ArgsEscaped": true,
            "Image": "sha256:3b3cda3111fa9895127e271e15c890295102427948d746dbd8148e44e518096f",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "GIT_COMMIT": "b14fd66b44180a9b8dd2bce98417699424d08fbb"
            }
        },
        "Architecture": "amd64",
        "Os": "linux",
        "Size": 5533135,
        "VirtualSize": 5533135,
        "GraphDriver": {
            "Data": {
                "MergedDir": "/var/lib/docker/overlay2/e3218e675ce11527bd72025d3a5b65afaf241dd3e4cb1c60babed524235b30df/merged",
                "UpperDir": "/var/lib/docker/overlay2/e3218e675ce11527bd72025d3a5b65afaf241dd3e4cb1c60babed524235b30df/diff",
                "WorkDir": "/var/lib/docker/overlay2/e3218e675ce11527bd72025d3a5b65afaf241dd3e4cb1c60babed524235b30df/work"
            },
            "Name": "overlay2"
        },
        "RootFS": {
            "Type": "layers",
            "Layers": [
                "sha256:f1b5933fe4b5f49bbe8258745cf396afe07e625bdab3168e364daf7c956b6b81"
            ]
        },
        "Metadata": {
            "LastTagTime": "2019-05-12T09:34:12.97186321Z"
        }
    }
]