• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Dockerfile Syntax 1.10.0 has been released, allowing secrets to be mounted as environment variables (+ file) rather than as a file.
Instead of target=<path> we can use env=<env_var_name>.

As it is brand new, the current rules do not allow this new field and raise an error.

Expected behavior

No error raised at all

Actual behavior

hadolint Dockerfile

Dockerfile.test:6:36 unexpected "env=ENV_VAR ec" expecting "gid=", "id=", "mode=", "required", "required=False", "required=True", "required=false", "required=true", "uid=", source=, or target=

Steps to reproduce the behavior

Output of hadolint --version

Haskell Dockerfile Linter 2.12.0

Dockerfile

# syntax=docker/dockerfile:1.10

FROM node:20

RUN --mount=type=secret,id=ENV_VAR,env=ENV_VAR echo "ENV_VAR=$ENV_VAR" > /tmp/env_var

Command run = docker build . --secret 'id=ENV_VAR,env=ENV_VAR'