syntax: add support for --link
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- Add support for parsing `--link` flag in `COPY` and `ADD` instructions. With Dockerfile syntax version 1.4, the `--link` flag for the `COPY` and `ADD` instructions become officially supported. The flag changes the way the layers are treated during build such that caching can work more efficient. See also: https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/syntax.md This change modifies the AST and is not backwards compatible. For `COPY` and `ADD` instructions, the arguments are now separated from the flags. This also allows the creation of a default instance for the data structure containing the flags. fixes: hadolint#81
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--linkflag inCOPYandADDinstructions.
With Dockerfile syntax version 1.4, the
--linkflag for theCOPYandADDinstructions become officially supported. The flag changes the waythe layers are treated during build such that caching can work more
efficient.
See also: https://github.com/moby/buildkit/blob/master/frontend/dockerfile/docs/syntax.md
This change modifies the AST and is not backwards compatible. For
COPYand
ADDinstructions, the arguments are now separated from the flags.This also allows the creation of a default instance for the data
structure containing the flags.
fixes: #81