Ability to combine multiple commands in one RUN statement?

[noah10]

According to https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/ , one should always combine your apt-get update and apt-get install commands, e.g.

RUN apt-get update && apt-get install -y package-foo

Is there a way to do this when adding a run command? Not surprisingly,

ExecCmd("RUN", "apt-get", "update", "&&", "apt-get", "install", "-y", "package-foo")

...results in '&&' and subsequent items being treated as parameters for the apt-get binary, which obviously doesn't work.

[noah10]

Figured it out: The trick is to use Cmd, not ExecCmd. Unlike ExecCmd, Cmd doesn't separate the binary and the parameters; it simply executes the entire thing as a single shell command. So if you add something like

Cmd("RUN", "apt-get update -y && apt-get install package-foo -y")

to your dockerCommands it will do what you want it to.