dockerfile: formal syntax specification

[dseynaev]

Any chance on having a more formal specification of the dockerfile frontend at some point?

I came here after reading moby/moby#12221
My usecase is that I'm writing a generator for dockerfiles so having something that's machine parse-able would be great.
Doesn't necessarily have to be a BNF: a common pattern I've seen for Go is to have a giant file with structs.

If this is the wrong place to ask, a pointer would be appreciated :) If I understood correctly, this is the current upstream for dockerfile syntax?

[TBBle]

Until #163 is done, this is probably the best place for it.