英文:
Go templates - Search all keys recursively
问题
我经常发现自己需要在 docker x 命令的输出中查找特定的键。我通常使用 grep 或者有时使用 jq 命令，但是也许 go 模板有一些构建机制可以输出一个键及其值，而不需要知道该值的具体 "路径"。
例如，在 docker image inspect <x> 命令中，Cmd 的路径可能是 [0].ContainerConfig.Cmd 或者 [0].Config.Cmd。
是否可以在 Go 模板中检索这两个键及其值？
英文:
I often find myself in need to find a specific key in docker x command output. I usually use grep sometimes jq command but maybe go templates have some build mechanism to output a key and it's value without knowing the specific "path" of that value ?
For example in case of docker image inspect <x> command the path to Cmd would be something like [0].ContainerConfig.Cmd or [0].Config.Cmd
is it possible to retrieve both of those keys and their values in Go template ?
答案1
得分: 2
只是笨拙地。将其拆分为多行，你可以这样写：
{{- if .ContainerConfig.Cmd -}}
{{- .ContainerConfig.Cmd -}}
{{- else if .Config.Cmd -}}
{{- .Config.Cmd -}}
{{- else -}}
""
{{- end -}}
你需要删除换行符并将其打包成单个 docker inspect -f 选项，这很不方便。
如你在问题中建议的那样使用 jq 可能会更容易一些；或者使用 Docker SDK，如 @Vorsprung 建议的，可以让你在比裸露的 Go text/template 语言更丰富的语言中以代码的形式完成这个任务。
英文:
Only awkwardly. Split on to multiple lines, you could write
{{- if .ContainerConfig.Cmd -}}
{{- .ContainerConfig.Cmd -}}
{{- else if .Config.Cmd -}}
{{- .Config.Cmd -}}
{{- else -}}
""
{{- end -}}
You'd have to remove the newlines and pack that into a single docker inspect -f option, which is inconvenient.
Using jq as you suggest in the question is probably a little easier; or @Vorsprung's suggestion of using a Docker SDK will let you do this in code in a language richer than the bare Go text/template language.
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