如何有条件地使用打包器构建 aws ami？

Question

仅当结果（shell 命令）与“provisioner”部分中的值匹配时，我才使用打包器构建新的 ami

我正在寻找在“供应商”部分有条件语句的解决方案

"provisioners": [
  {
    "type": "shell",
    "inline": [
      res=f(20)
    ]

在这个例子中，我想定义一个条件，如果 res = 10 然后继续（所以打包器将生成 aws ami）否则停止执行（并打印一条消息）

Answer 1

我将从免责声明开始：有条件地构建并不是供应商真正打算做的事情。 理想情况下，这种逻辑应该在打包程序构建过程之外处理，也许在@MattSchuchard 建议的构建管道中处理。 构建管道工具的示例有：Jenkins、CircleCI、Drone.IO

但是：如果您确实需要将此逻辑内置到配置程序中，Packer 会终止并退出非零错误代码，因此您可以执行以下操作：

"provisioners": [
    {
        "type": "shell",
        "inline": [
            "if [ $res -eq f(20) ]; then echo $res && exit 0; else echo "Incorrect result" && exit 1; fi"
        ]
    }
]

您可以通过使用valid_exit_codes选项并定义您希望从您要验证的特定情况中获得哪些退出代码来进一步调整它。 参考： https://www.packer.io/docs/provisioners/shell.html#valid_exit_codes

示例 Output：

$ packer build -var-file=provisioner-test.json build.json
==> amazon-ebs: Prevalidating AMI Name: Test-37Cv9mXMGqw5zAV
    amazon-ebs: Found Image ID: ami-09693313102a30b2c
==> amazon-ebs: Creating temporary keypair: packer_5d96a8b4-ef4d-a705-a393-076457bdc3ea
==> amazon-ebs: Launching a source AWS instance...
==> amazon-ebs: Adding tags to source instance
    amazon-ebs: Adding tag: "Name": "Packer Builder"
    amazon-ebs: Instance ID: i-0ca4d944fe99255da
==> amazon-ebs: Waiting for instance (i-0ca4d944fe99255da) to become ready...
==> amazon-ebs: Using ssh communicator to connect: 10.0.24.189
==> amazon-ebs: Waiting for SSH to become available...
==> amazon-ebs: Connected to SSH!
==> amazon-ebs: Provisioning with shell script: /var/folders/mg/wc582qjx0y759zw3hfwxwjmm0000gp/T/packer-shell814735146
    amazon-ebs: Incorrect result
==> amazon-ebs: Terminating the source AWS instance...
==> amazon-ebs: Cleaning up any extra volumes...
==> amazon-ebs: No volumes to clean up, skipping
==> amazon-ebs: Deleting temporary keypair...
Build 'amazon-ebs' errored: Script exited with non-zero exit status: 1.Allowed exit codes are: [0]

==> Some builds didn't complete successfully and had errors:
--> amazon-ebs: Script exited with non-zero exit status: 1.Allowed exit codes are: [0]

==> Builds finished but no artifacts were created.