git commit hash in dockerfile as label

Question

How to add git commit hash or any other dynamically inferred value in Dockerfile.

LABEL vcs-ref=$(git rev-parse --short HEAD)

Something like this?

Answer 1

I found it atlast,

use docker build --build-arg vcs-ref=$(git rev-parse --short HEAD)

while building.

But have to initialize the variable in vcs-ref in Dockerfile

ARG vcs-ref=0
ENV vcs-ref=$vcs-ref